1 /*
   2  * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.awt;
  27 
  28 import java.beans.PropertyChangeEvent;
  29 import java.util.MissingResourceException;
  30 import java.util.Properties;
  31 import java.util.ResourceBundle;
  32 import java.util.StringTokenizer;
  33 import java.awt.event.*;
  34 import java.awt.peer.*;
  35 import java.awt.im.InputMethodHighlight;
  36 import java.awt.image.ImageObserver;
  37 import java.awt.image.ImageProducer;
  38 import java.awt.image.ColorModel;
  39 import java.awt.datatransfer.Clipboard;
  40 import java.awt.dnd.DragSource;
  41 import java.awt.dnd.DragGestureRecognizer;
  42 import java.awt.dnd.DragGestureEvent;
  43 import java.awt.dnd.DragGestureListener;
  44 import java.awt.dnd.InvalidDnDOperationException;
  45 import java.awt.dnd.peer.DragSourceContextPeer;
  46 import java.net.URL;
  47 import java.io.File;
  48 import java.io.FileInputStream;
  49 
  50 import java.util.*;
  51 import sun.util.logging.PlatformLogger;
  52 
  53 import java.beans.PropertyChangeListener;
  54 import java.beans.PropertyChangeSupport;
  55 import sun.awt.AppContext;
  56 
  57 import sun.awt.HeadlessToolkit;
  58 import sun.awt.NullComponentPeer;
  59 import sun.awt.PeerEvent;
  60 import sun.awt.SunToolkit;
  61 import sun.security.util.SecurityConstants;
  62 
  63 import sun.util.CoreResourceBundleControl;
  64 
  65 /**
  66  * This class is the abstract superclass of all actual
  67  * implementations of the Abstract Window Toolkit. Subclasses of
  68  * the <code>Toolkit</code> class are used to bind the various components
  69  * to particular native toolkit implementations.
  70  * <p>
  71  * Many GUI events may be delivered to user
  72  * asynchronously, if the opposite is not specified explicitly.
  73  * As well as
  74  * many GUI operations may be performed asynchronously.
  75  * This fact means that if the state of a component is set, and then
  76  * the state immediately queried, the returned value may not yet
  77  * reflect the requested change.  This behavior includes, but is not
  78  * limited to:
  79  * <ul>
  80  * <li>Scrolling to a specified position.
  81  * <br>For example, calling <code>ScrollPane.setScrollPosition</code>
  82  *     and then <code>getScrollPosition</code> may return an incorrect
  83  *     value if the original request has not yet been processed.
  84  * <p>
  85  * <li>Moving the focus from one component to another.
  86  * <br>For more information, see
  87  * <a href="http://java.sun.com/docs/books/tutorial/uiswing/misc/focus.html#transferTiming">Timing
  88  * Focus Transfers</a>, a section in
  89  * <a href="http://java.sun.com/docs/books/tutorial/uiswing/">The Swing
  90  * Tutorial</a>.
  91  * <p>
  92  * <li>Making a top-level container visible.
  93  * <br>Calling <code>setVisible(true)</code> on a <code>Window</code>,
  94  *     <code>Frame</code> or <code>Dialog</code> may occur
  95  *     asynchronously.
  96  * <p>
  97  * <li>Setting the size or location of a top-level container.
  98  * <br>Calls to <code>setSize</code>, <code>setBounds</code> or
  99  *     <code>setLocation</code> on a <code>Window</code>,
 100  *     <code>Frame</code> or <code>Dialog</code> are forwarded
 101  *     to the underlying window management system and may be
 102  *     ignored or modified.  See {@link java.awt.Window} for
 103  *     more information.
 104  * </ul>
 105  * <p>
 106  * Most applications should not call any of the methods in this
 107  * class directly. The methods defined by <code>Toolkit</code> are
 108  * the "glue" that joins the platform-independent classes in the
 109  * <code>java.awt</code> package with their counterparts in
 110  * <code>java.awt.peer</code>. Some methods defined by
 111  * <code>Toolkit</code> query the native operating system directly.
 112  *
 113  * @author      Sami Shaio
 114  * @author      Arthur van Hoff
 115  * @author      Fred Ecks
 116  * @since       JDK1.0
 117  */
 118 public abstract class Toolkit {
 119 
 120     /**
 121      * Creates this toolkit's implementation of the <code>Desktop</code>
 122      * using the specified peer interface.
 123      * @param     target the desktop to be implemented
 124      * @return    this toolkit's implementation of the <code>Desktop</code>
 125      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 126      * returns true
 127      * @see       java.awt.GraphicsEnvironment#isHeadless
 128      * @see       java.awt.Desktop
 129      * @see       java.awt.peer.DesktopPeer
 130      * @since 1.6
 131      */
 132     protected abstract DesktopPeer createDesktopPeer(Desktop target)
 133       throws HeadlessException;
 134 
 135 
 136     /**
 137      * Creates this toolkit's implementation of <code>Button</code> using
 138      * the specified peer interface.
 139      * @param     target the button to be implemented.
 140      * @return    this toolkit's implementation of <code>Button</code>.
 141      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 142      * returns true
 143      * @see       java.awt.GraphicsEnvironment#isHeadless
 144      * @see       java.awt.Button
 145      * @see       java.awt.peer.ButtonPeer
 146      */
 147     protected abstract ButtonPeer createButton(Button target)
 148         throws HeadlessException;
 149 
 150     /**
 151      * Creates this toolkit's implementation of <code>TextField</code> using
 152      * the specified peer interface.
 153      * @param     target the text field to be implemented.
 154      * @return    this toolkit's implementation of <code>TextField</code>.
 155      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 156      * returns true
 157      * @see       java.awt.GraphicsEnvironment#isHeadless
 158      * @see       java.awt.TextField
 159      * @see       java.awt.peer.TextFieldPeer
 160      */
 161     protected abstract TextFieldPeer createTextField(TextField target)
 162         throws HeadlessException;
 163 
 164     /**
 165      * Creates this toolkit's implementation of <code>Label</code> using
 166      * the specified peer interface.
 167      * @param     target the label to be implemented.
 168      * @return    this toolkit's implementation of <code>Label</code>.
 169      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 170      * returns true
 171      * @see       java.awt.GraphicsEnvironment#isHeadless
 172      * @see       java.awt.Label
 173      * @see       java.awt.peer.LabelPeer
 174      */
 175     protected abstract LabelPeer createLabel(Label target)
 176         throws HeadlessException;
 177 
 178     /**
 179      * Creates this toolkit's implementation of <code>List</code> using
 180      * the specified peer interface.
 181      * @param     target the list to be implemented.
 182      * @return    this toolkit's implementation of <code>List</code>.
 183      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 184      * returns true
 185      * @see       java.awt.GraphicsEnvironment#isHeadless
 186      * @see       java.awt.List
 187      * @see       java.awt.peer.ListPeer
 188      */
 189     protected abstract ListPeer createList(java.awt.List target)
 190         throws HeadlessException;
 191 
 192     /**
 193      * Creates this toolkit's implementation of <code>Checkbox</code> using
 194      * the specified peer interface.
 195      * @param     target the check box to be implemented.
 196      * @return    this toolkit's implementation of <code>Checkbox</code>.
 197      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 198      * returns true
 199      * @see       java.awt.GraphicsEnvironment#isHeadless
 200      * @see       java.awt.Checkbox
 201      * @see       java.awt.peer.CheckboxPeer
 202      */
 203     protected abstract CheckboxPeer createCheckbox(Checkbox target)
 204         throws HeadlessException;
 205 
 206     /**
 207      * Creates this toolkit's implementation of <code>Scrollbar</code> using
 208      * the specified peer interface.
 209      * @param     target the scroll bar to be implemented.
 210      * @return    this toolkit's implementation of <code>Scrollbar</code>.
 211      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 212      * returns true
 213      * @see       java.awt.GraphicsEnvironment#isHeadless
 214      * @see       java.awt.Scrollbar
 215      * @see       java.awt.peer.ScrollbarPeer
 216      */
 217     protected abstract ScrollbarPeer createScrollbar(Scrollbar target)
 218         throws HeadlessException;
 219 
 220     /**
 221      * Creates this toolkit's implementation of <code>ScrollPane</code> using
 222      * the specified peer interface.
 223      * @param     target the scroll pane to be implemented.
 224      * @return    this toolkit's implementation of <code>ScrollPane</code>.
 225      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 226      * returns true
 227      * @see       java.awt.GraphicsEnvironment#isHeadless
 228      * @see       java.awt.ScrollPane
 229      * @see       java.awt.peer.ScrollPanePeer
 230      * @since     JDK1.1
 231      */
 232     protected abstract ScrollPanePeer createScrollPane(ScrollPane target)
 233         throws HeadlessException;
 234 
 235     /**
 236      * Creates this toolkit's implementation of <code>TextArea</code> using
 237      * the specified peer interface.
 238      * @param     target the text area to be implemented.
 239      * @return    this toolkit's implementation of <code>TextArea</code>.
 240      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 241      * returns true
 242      * @see       java.awt.GraphicsEnvironment#isHeadless
 243      * @see       java.awt.TextArea
 244      * @see       java.awt.peer.TextAreaPeer
 245      */
 246     protected abstract TextAreaPeer createTextArea(TextArea target)
 247         throws HeadlessException;
 248 
 249     /**
 250      * Creates this toolkit's implementation of <code>Choice</code> using
 251      * the specified peer interface.
 252      * @param     target the choice to be implemented.
 253      * @return    this toolkit's implementation of <code>Choice</code>.
 254      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 255      * returns true
 256      * @see       java.awt.GraphicsEnvironment#isHeadless
 257      * @see       java.awt.Choice
 258      * @see       java.awt.peer.ChoicePeer
 259      */
 260     protected abstract ChoicePeer createChoice(Choice target)
 261         throws HeadlessException;
 262 
 263     /**
 264      * Creates this toolkit's implementation of <code>Frame</code> using
 265      * the specified peer interface.
 266      * @param     target the frame to be implemented.
 267      * @return    this toolkit's implementation of <code>Frame</code>.
 268      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 269      * returns true
 270      * @see       java.awt.GraphicsEnvironment#isHeadless
 271      * @see       java.awt.Frame
 272      * @see       java.awt.peer.FramePeer
 273      */
 274     protected abstract FramePeer createFrame(Frame target)
 275         throws HeadlessException;
 276 
 277     /**
 278      * Creates this toolkit's implementation of <code>Canvas</code> using
 279      * the specified peer interface.
 280      * @param     target the canvas to be implemented.
 281      * @return    this toolkit's implementation of <code>Canvas</code>.
 282      * @see       java.awt.Canvas
 283      * @see       java.awt.peer.CanvasPeer
 284      */
 285     protected abstract CanvasPeer       createCanvas(Canvas target);
 286 
 287     /**
 288      * Creates this toolkit's implementation of <code>Panel</code> using
 289      * the specified peer interface.
 290      * @param     target the panel to be implemented.
 291      * @return    this toolkit's implementation of <code>Panel</code>.
 292      * @see       java.awt.Panel
 293      * @see       java.awt.peer.PanelPeer
 294      */
 295     protected abstract PanelPeer        createPanel(Panel target);
 296 
 297     /**
 298      * Creates this toolkit's implementation of <code>Window</code> using
 299      * the specified peer interface.
 300      * @param     target the window to be implemented.
 301      * @return    this toolkit's implementation of <code>Window</code>.
 302      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 303      * returns true
 304      * @see       java.awt.GraphicsEnvironment#isHeadless
 305      * @see       java.awt.Window
 306      * @see       java.awt.peer.WindowPeer
 307      */
 308     protected abstract WindowPeer createWindow(Window target)
 309         throws HeadlessException;
 310 
 311     /**
 312      * Creates this toolkit's implementation of <code>Dialog</code> using
 313      * the specified peer interface.
 314      * @param     target the dialog to be implemented.
 315      * @return    this toolkit's implementation of <code>Dialog</code>.
 316      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 317      * returns true
 318      * @see       java.awt.GraphicsEnvironment#isHeadless
 319      * @see       java.awt.Dialog
 320      * @see       java.awt.peer.DialogPeer
 321      */
 322     protected abstract DialogPeer createDialog(Dialog target)
 323         throws HeadlessException;
 324 
 325     /**
 326      * Creates this toolkit's implementation of <code>MenuBar</code> using
 327      * the specified peer interface.
 328      * @param     target the menu bar to be implemented.
 329      * @return    this toolkit's implementation of <code>MenuBar</code>.
 330      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 331      * returns true
 332      * @see       java.awt.GraphicsEnvironment#isHeadless
 333      * @see       java.awt.MenuBar
 334      * @see       java.awt.peer.MenuBarPeer
 335      */
 336     protected abstract MenuBarPeer createMenuBar(MenuBar target)
 337         throws HeadlessException;
 338 
 339     /**
 340      * Creates this toolkit's implementation of <code>Menu</code> using
 341      * the specified peer interface.
 342      * @param     target the menu to be implemented.
 343      * @return    this toolkit's implementation of <code>Menu</code>.
 344      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 345      * returns true
 346      * @see       java.awt.GraphicsEnvironment#isHeadless
 347      * @see       java.awt.Menu
 348      * @see       java.awt.peer.MenuPeer
 349      */
 350     protected abstract MenuPeer createMenu(Menu target)
 351         throws HeadlessException;
 352 
 353     /**
 354      * Creates this toolkit's implementation of <code>PopupMenu</code> using
 355      * the specified peer interface.
 356      * @param     target the popup menu to be implemented.
 357      * @return    this toolkit's implementation of <code>PopupMenu</code>.
 358      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 359      * returns true
 360      * @see       java.awt.GraphicsEnvironment#isHeadless
 361      * @see       java.awt.PopupMenu
 362      * @see       java.awt.peer.PopupMenuPeer
 363      * @since     JDK1.1
 364      */
 365     protected abstract PopupMenuPeer createPopupMenu(PopupMenu target)
 366         throws HeadlessException;
 367 
 368     /**
 369      * Creates this toolkit's implementation of <code>MenuItem</code> using
 370      * the specified peer interface.
 371      * @param     target the menu item to be implemented.
 372      * @return    this toolkit's implementation of <code>MenuItem</code>.
 373      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 374      * returns true
 375      * @see       java.awt.GraphicsEnvironment#isHeadless
 376      * @see       java.awt.MenuItem
 377      * @see       java.awt.peer.MenuItemPeer
 378      */
 379     protected abstract MenuItemPeer createMenuItem(MenuItem target)
 380         throws HeadlessException;
 381 
 382     /**
 383      * Creates this toolkit's implementation of <code>FileDialog</code> using
 384      * the specified peer interface.
 385      * @param     target the file dialog to be implemented.
 386      * @return    this toolkit's implementation of <code>FileDialog</code>.
 387      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 388      * returns true
 389      * @see       java.awt.GraphicsEnvironment#isHeadless
 390      * @see       java.awt.FileDialog
 391      * @see       java.awt.peer.FileDialogPeer
 392      */
 393     protected abstract FileDialogPeer createFileDialog(FileDialog target)
 394         throws HeadlessException;
 395 
 396     /**
 397      * Creates this toolkit's implementation of <code>CheckboxMenuItem</code> using
 398      * the specified peer interface.
 399      * @param     target the checkbox menu item to be implemented.
 400      * @return    this toolkit's implementation of <code>CheckboxMenuItem</code>.
 401      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 402      * returns true
 403      * @see       java.awt.GraphicsEnvironment#isHeadless
 404      * @see       java.awt.CheckboxMenuItem
 405      * @see       java.awt.peer.CheckboxMenuItemPeer
 406      */
 407     protected abstract CheckboxMenuItemPeer createCheckboxMenuItem(
 408         CheckboxMenuItem target) throws HeadlessException;
 409 
 410     /**
 411      * Obtains this toolkit's implementation of helper class for
 412      * <code>MouseInfo</code> operations.
 413      * @return    this toolkit's implementation of  helper for <code>MouseInfo</code>
 414      * @throws    UnsupportedOperationException if this operation is not implemented
 415      * @see       java.awt.peer.MouseInfoPeer
 416      * @see       java.awt.MouseInfo
 417      * @since 1.5
 418      */
 419     protected MouseInfoPeer getMouseInfoPeer() {
 420         throw new UnsupportedOperationException("Not implemented");
 421     }
 422 
 423     private static LightweightPeer lightweightMarker;
 424 
 425     /**
 426      * Creates a peer for a component or container.  This peer is windowless
 427      * and allows the Component and Container classes to be extended directly
 428      * to create windowless components that are defined entirely in java.
 429      *
 430      * @param target The Component to be created.
 431      */
 432     protected LightweightPeer createComponent(Component target) {
 433         if (lightweightMarker == null) {
 434             lightweightMarker = new NullComponentPeer();
 435         }
 436         return lightweightMarker;
 437     }
 438 
 439     /**
 440      * Creates this toolkit's implementation of <code>Font</code> using
 441      * the specified peer interface.
 442      * @param     name the font to be implemented
 443      * @param     style the style of the font, such as <code>PLAIN</code>,
 444      *            <code>BOLD</code>, <code>ITALIC</code>, or a combination
 445      * @return    this toolkit's implementation of <code>Font</code>
 446      * @see       java.awt.Font
 447      * @see       java.awt.peer.FontPeer
 448      * @see       java.awt.GraphicsEnvironment#getAllFonts
 449      * @deprecated  see java.awt.GraphicsEnvironment#getAllFonts
 450      */
 451     @Deprecated
 452     protected abstract FontPeer getFontPeer(String name, int style);
 453 
 454     // The following method is called by the private method
 455     // <code>updateSystemColors</code> in <code>SystemColor</code>.
 456 
 457     /**
 458      * Fills in the integer array that is supplied as an argument
 459      * with the current system color values.
 460      *
 461      * @param     systemColors an integer array.
 462      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 463      * returns true
 464      * @see       java.awt.GraphicsEnvironment#isHeadless
 465      * @since     JDK1.1
 466      */
 467     protected void loadSystemColors(int[] systemColors)
 468         throws HeadlessException {
 469     }
 470 
 471 /**
 472      * Controls whether the layout of Containers is validated dynamically
 473      * during resizing, or statically, after resizing is complete.
 474      * Use {@code isDynamicLayoutActive()} to detect if this feature enabled
 475      * in this program and is supported by this operating system
 476      * and/or window manager.
 477      * Note that this feature is supported not on all platforms, and
 478      * conversely, that this feature cannot be turned off on some platforms.
 479      * On these platforms where dynamic layout during resizing is not supported
 480      * (or is always supported), setting this property has no effect.
 481      * Note that this feature can be set or unset as a property of the
 482      * operating system or window manager on some platforms.  On such
 483      * platforms, the dynamic resize property must be set at the operating
 484      * system or window manager level before this method can take effect.
 485      * This method does not change support or settings of the underlying
 486      * operating system or
 487      * window manager.  The OS/WM support can be
 488      * queried using getDesktopProperty("awt.dynamicLayoutSupported") method.
 489      *
 490      * @param     dynamic  If true, Containers should re-layout their
 491      *            components as the Container is being resized.  If false,
 492      *            the layout will be validated after resizing is completed.
 493      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 494      *            returns true
 495      * @see       #isDynamicLayoutSet()
 496      * @see       #isDynamicLayoutActive()
 497      * @see       #getDesktopProperty(String propertyName)
 498      * @see       java.awt.GraphicsEnvironment#isHeadless
 499      * @since     1.4
 500      */
 501     public void setDynamicLayout(boolean dynamic)
 502         throws HeadlessException {
 503     }
 504 
 505     /**
 506      * Returns whether the layout of Containers is validated dynamically
 507      * during resizing, or statically, after resizing is complete.
 508      * Note: this method returns the value that was set programmatically;
 509      * it does not reflect support at the level of the operating system
 510      * or window manager for dynamic layout on resizing, or the current
 511      * operating system or window manager settings.  The OS/WM support can
 512      * be queried using getDesktopProperty("awt.dynamicLayoutSupported").
 513      *
 514      * @return    true if validation of Containers is done dynamically,
 515      *            false if validation is done after resizing is finished.
 516      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 517      *            returns true
 518      * @see       #setDynamicLayout(boolean dynamic)
 519      * @see       #isDynamicLayoutActive()
 520      * @see       #getDesktopProperty(String propertyName)
 521      * @see       java.awt.GraphicsEnvironment#isHeadless
 522      * @since     1.4
 523      */
 524     protected boolean isDynamicLayoutSet()
 525         throws HeadlessException {
 526         if (this != Toolkit.getDefaultToolkit()) {
 527             return Toolkit.getDefaultToolkit().isDynamicLayoutSet();
 528         } else {
 529             return false;
 530         }
 531     }
 532 
 533     /**
 534      * Returns whether dynamic layout of Containers on resize is
 535      * currently active (both set in program
 536      *( {@code isDynamicLayoutSet()} )
 537      *, and supported
 538      * by the underlying operating system and/or window manager).
 539      * If dynamic layout is currently inactive then Containers
 540      * re-layout their components when resizing is completed. As a result
 541      * the {@code Component.validate()} method will be invoked only
 542      * once per resize.
 543      * If dynamic layout is currently active then Containers
 544      * re-layout their components on every native resize event and
 545      * the {@code validate()} method will be invoked each time.
 546      * The OS/WM support can be queried using
 547      * the getDesktopProperty("awt.dynamicLayoutSupported") method.
 548      *
 549      * @return    true if dynamic layout of Containers on resize is
 550      *            currently active, false otherwise.
 551      * @exception HeadlessException if the GraphicsEnvironment.isHeadless()
 552      *            method returns true
 553      * @see       #setDynamicLayout(boolean dynamic)
 554      * @see       #isDynamicLayoutSet()
 555      * @see       #getDesktopProperty(String propertyName)
 556      * @see       java.awt.GraphicsEnvironment#isHeadless
 557      * @since     1.4
 558      */
 559     public boolean isDynamicLayoutActive()
 560         throws HeadlessException {
 561         if (this != Toolkit.getDefaultToolkit()) {
 562             return Toolkit.getDefaultToolkit().isDynamicLayoutActive();
 563         } else {
 564             return false;
 565         }
 566     }
 567 
 568     /**
 569      * Gets the size of the screen.  On systems with multiple displays, the
 570      * primary display is used.  Multi-screen aware display dimensions are
 571      * available from <code>GraphicsConfiguration</code> and
 572      * <code>GraphicsDevice</code>.
 573      * @return    the size of this toolkit's screen, in pixels.
 574      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 575      * returns true
 576      * @see       java.awt.GraphicsConfiguration#getBounds
 577      * @see       java.awt.GraphicsDevice#getDisplayMode
 578      * @see       java.awt.GraphicsEnvironment#isHeadless
 579      */
 580     public abstract Dimension getScreenSize()
 581         throws HeadlessException;
 582 
 583     /**
 584      * Returns the screen resolution in dots-per-inch.
 585      * @return    this toolkit's screen resolution, in dots-per-inch.
 586      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 587      * returns true
 588      * @see       java.awt.GraphicsEnvironment#isHeadless
 589      */
 590     public abstract int getScreenResolution()
 591         throws HeadlessException;
 592 
 593     /**
 594      * Gets the insets of the screen.
 595      * @param     gc a <code>GraphicsConfiguration</code>
 596      * @return    the insets of this toolkit's screen, in pixels.
 597      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 598      * returns true
 599      * @see       java.awt.GraphicsEnvironment#isHeadless
 600      * @since     1.4
 601      */
 602     public Insets getScreenInsets(GraphicsConfiguration gc)
 603         throws HeadlessException {
 604         if (this != Toolkit.getDefaultToolkit()) {
 605             return Toolkit.getDefaultToolkit().getScreenInsets(gc);
 606         } else {
 607             return new Insets(0, 0, 0, 0);
 608         }
 609     }
 610 
 611     /**
 612      * Determines the color model of this toolkit's screen.
 613      * <p>
 614      * <code>ColorModel</code> is an abstract class that
 615      * encapsulates the ability to translate between the
 616      * pixel values of an image and its red, green, blue,
 617      * and alpha components.
 618      * <p>
 619      * This toolkit method is called by the
 620      * <code>getColorModel</code> method
 621      * of the <code>Component</code> class.
 622      * @return    the color model of this toolkit's screen.
 623      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
 624      * returns true
 625      * @see       java.awt.GraphicsEnvironment#isHeadless
 626      * @see       java.awt.image.ColorModel
 627      * @see       java.awt.Component#getColorModel
 628      */
 629     public abstract ColorModel getColorModel()
 630         throws HeadlessException;
 631 
 632     /**
 633      * Returns the names of the available fonts in this toolkit.<p>
 634      * For 1.1, the following font names are deprecated (the replacement
 635      * name follows):
 636      * <ul>
 637      * <li>TimesRoman (use Serif)
 638      * <li>Helvetica (use SansSerif)
 639      * <li>Courier (use Monospaced)
 640      * </ul><p>
 641      * The ZapfDingbats fontname is also deprecated in 1.1 but the characters
 642      * are defined in Unicode starting at 0x2700, and as of 1.1 Java supports
 643      * those characters.
 644      * @return    the names of the available fonts in this toolkit.
 645      * @deprecated see {@link java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()}
 646      * @see java.awt.GraphicsEnvironment#getAvailableFontFamilyNames()
 647      */
 648     @Deprecated
 649     public abstract String[] getFontList();
 650 
 651     /**
 652      * Gets the screen device metrics for rendering of the font.
 653      * @param     font   a font
 654      * @return    the screen metrics of the specified font in this toolkit
 655      * @deprecated  As of JDK version 1.2, replaced by the <code>Font</code>
 656      *          method <code>getLineMetrics</code>.
 657      * @see java.awt.font.LineMetrics
 658      * @see java.awt.Font#getLineMetrics
 659      * @see java.awt.GraphicsEnvironment#getScreenDevices
 660      */
 661     @Deprecated
 662     public abstract FontMetrics getFontMetrics(Font font);
 663 
 664     /**
 665      * Synchronizes this toolkit's graphics state. Some window systems
 666      * may do buffering of graphics events.
 667      * <p>
 668      * This method ensures that the display is up-to-date. It is useful
 669      * for animation.
 670      */
 671     public abstract void sync();
 672 
 673     /**
 674      * The default toolkit.
 675      */
 676     private static Toolkit toolkit;
 677 
 678     /**
 679      * Used internally by the assistive technologies functions; set at
 680      * init time and used at load time
 681      */
 682     private static String atNames;
 683 
 684     /**
 685      * Initializes properties related to assistive technologies.
 686      * These properties are used both in the loadAssistiveProperties()
 687      * function below, as well as other classes in the jdk that depend
 688      * on the properties (such as the use of the screen_magnifier_present
 689      * property in Java2D hardware acceleration initialization).  The
 690      * initialization of the properties must be done before the platform-
 691      * specific Toolkit class is instantiated so that all necessary
 692      * properties are set up properly before any classes dependent upon them
 693      * are initialized.
 694      */
 695     private static void initAssistiveTechnologies() {
 696 
 697         // Get accessibility properties
 698         final String sep = File.separator;
 699         final Properties properties = new Properties();
 700 
 701 
 702         atNames = (String)java.security.AccessController.doPrivileged(
 703             new java.security.PrivilegedAction() {
 704             public Object run() {
 705 
 706                 // Try loading the per-user accessibility properties file.
 707                 try {
 708                     File propsFile = new File(
 709                       System.getProperty("user.home") +
 710                       sep + ".accessibility.properties");
 711                     FileInputStream in =
 712                         new FileInputStream(propsFile);
 713 
 714                     // Inputstream has been buffered in Properties class
 715                     properties.load(in);
 716                     in.close();
 717                 } catch (Exception e) {
 718                     // Per-user accessibility properties file does not exist
 719                 }
 720 
 721                 // Try loading the system-wide accessibility properties
 722                 // file only if a per-user accessibility properties
 723                 // file does not exist or is empty.
 724                 if (properties.size() == 0) {
 725                     try {
 726                         File propsFile = new File(
 727                             System.getProperty("java.home") + sep + "lib" +
 728                             sep + "accessibility.properties");
 729                         FileInputStream in =
 730                             new FileInputStream(propsFile);
 731 
 732                         // Inputstream has been buffered in Properties class
 733                         properties.load(in);
 734                         in.close();
 735                     } catch (Exception e) {
 736                         // System-wide accessibility properties file does
 737                         // not exist;
 738                     }
 739                 }
 740 
 741                 // Get whether a screen magnifier is present.  First check
 742                 // the system property and then check the properties file.
 743                 String magPresent = System.getProperty("javax.accessibility.screen_magnifier_present");
 744                 if (magPresent == null) {
 745                     magPresent = properties.getProperty("screen_magnifier_present", null);
 746                     if (magPresent != null) {
 747                         System.setProperty("javax.accessibility.screen_magnifier_present", magPresent);
 748                     }
 749                 }
 750 
 751                 // Get the names of any assistive technolgies to load.  First
 752                 // check the system property and then check the properties
 753                 // file.
 754                 String classNames = System.getProperty("javax.accessibility.assistive_technologies");
 755                 if (classNames == null) {
 756                     classNames = properties.getProperty("assistive_technologies", null);
 757                     if (classNames != null) {
 758                         System.setProperty("javax.accessibility.assistive_technologies", classNames);
 759                     }
 760                 }
 761                 return classNames;
 762             }
 763         });
 764     }
 765 
 766     /**
 767      * Loads additional classes into the VM, using the property
 768      * 'assistive_technologies' specified in the Sun reference
 769      * implementation by a line in the 'accessibility.properties'
 770      * file.  The form is "assistive_technologies=..." where
 771      * the "..." is a comma-separated list of assistive technology
 772      * classes to load.  Each class is loaded in the order given
 773      * and a single instance of each is created using
 774      * Class.forName(class).newInstance().  All errors are handled
 775      * via an AWTError exception.
 776      *
 777      * <p>The assumption is made that assistive technology classes are supplied
 778      * as part of INSTALLED (as opposed to: BUNDLED) extensions or specified
 779      * on the class path
 780      * (and therefore can be loaded using the class loader returned by
 781      * a call to <code>ClassLoader.getSystemClassLoader</code>, whose
 782      * delegation parent is the extension class loader for installed
 783      * extensions).
 784      */
 785     private static void loadAssistiveTechnologies() {
 786         // Load any assistive technologies
 787         if (atNames != null) {
 788             ClassLoader cl = ClassLoader.getSystemClassLoader();
 789             StringTokenizer parser = new StringTokenizer(atNames," ,");
 790             String atName;
 791             while (parser.hasMoreTokens()) {
 792                 atName = parser.nextToken();
 793                 try {
 794                     Class clazz;
 795                     if (cl != null) {
 796                         clazz = cl.loadClass(atName);
 797                     } else {
 798                         clazz = Class.forName(atName);
 799                     }
 800                     clazz.newInstance();
 801                 } catch (ClassNotFoundException e) {
 802                     throw new AWTError("Assistive Technology not found: "
 803                             + atName);
 804                 } catch (InstantiationException e) {
 805                     throw new AWTError("Could not instantiate Assistive"
 806                             + " Technology: " + atName);
 807                 } catch (IllegalAccessException e) {
 808                     throw new AWTError("Could not access Assistive"
 809                             + " Technology: " + atName);
 810                 } catch (Exception e) {
 811                     throw new AWTError("Error trying to install Assistive"
 812                             + " Technology: " + atName + " " + e);
 813                 }
 814             }
 815         }
 816     }
 817 
 818     /**
 819      * Gets the default toolkit.
 820      * <p>
 821      * If a system property named <code>"java.awt.headless"</code> is set
 822      * to <code>true</code> then the headless implementation
 823      * of <code>Toolkit</code> is used.
 824      * <p>
 825      * If there is no <code>"java.awt.headless"</code> or it is set to
 826      * <code>false</code> and there is a system property named
 827      * <code>"awt.toolkit"</code>,
 828      * that property is treated as the name of a class that is a subclass
 829      * of <code>Toolkit</code>;
 830      * otherwise the default platform-specific implementation of
 831      * <code>Toolkit</code> is used.
 832      * <p>
 833      * Also loads additional classes into the VM, using the property
 834      * 'assistive_technologies' specified in the Sun reference
 835      * implementation by a line in the 'accessibility.properties'
 836      * file.  The form is "assistive_technologies=..." where
 837      * the "..." is a comma-separated list of assistive technology
 838      * classes to load.  Each class is loaded in the order given
 839      * and a single instance of each is created using
 840      * Class.forName(class).newInstance().  This is done just after
 841      * the AWT toolkit is created.  All errors are handled via an
 842      * AWTError exception.
 843      * @return    the default toolkit.
 844      * @exception  AWTError  if a toolkit could not be found, or
 845      *                 if one could not be accessed or instantiated.
 846      */
 847     public static synchronized Toolkit getDefaultToolkit() {
 848         if (toolkit == null) {
 849             try {
 850                 // We disable the JIT during toolkit initialization.  This
 851                 // tends to touch lots of classes that aren't needed again
 852                 // later and therefore JITing is counter-productiive.
 853                 java.lang.Compiler.disable();
 854 
 855                 java.security.AccessController.doPrivileged(
 856                         new java.security.PrivilegedAction() {
 857                     public Object run() {
 858                         String nm = null;
 859                         Class cls = null;
 860                         try {
 861                             nm = System.getProperty("awt.toolkit", "sun.awt.X11.XToolkit");
 862                             try {
 863                                 cls = Class.forName(nm);
 864                             } catch (ClassNotFoundException e) {
 865                                 ClassLoader cl = ClassLoader.getSystemClassLoader();
 866                                 if (cl != null) {
 867                                     try {
 868                                         cls = cl.loadClass(nm);
 869                                     } catch (ClassNotFoundException ee) {
 870                                         throw new AWTError("Toolkit not found: " + nm);
 871                                     }
 872                                 }
 873                             }
 874                             if (cls != null) {
 875                                 toolkit = (Toolkit)cls.newInstance();
 876                                 if (GraphicsEnvironment.isHeadless()) {
 877                                     toolkit = new HeadlessToolkit(toolkit);
 878                                 }
 879                             }
 880                         } catch (InstantiationException e) {
 881                             throw new AWTError("Could not instantiate Toolkit: " + nm);
 882                         } catch (IllegalAccessException e) {
 883                             throw new AWTError("Could not access Toolkit: " + nm);
 884                         }
 885                         return null;
 886                     }
 887                 });
 888                 loadAssistiveTechnologies();
 889             } finally {
 890                 // Make sure to always re-enable the JIT.
 891                 java.lang.Compiler.enable();
 892             }
 893         }
 894         return toolkit;
 895     }
 896 
 897     /**
 898      * Returns an image which gets pixel data from the specified file,
 899      * whose format can be either GIF, JPEG or PNG.
 900      * The underlying toolkit attempts to resolve multiple requests
 901      * with the same filename to the same returned Image.
 902      * <p>
 903      * Since the mechanism required to facilitate this sharing of
 904      * <code>Image</code> objects may continue to hold onto images
 905      * that are no longer in use for an indefinite period of time,
 906      * developers are encouraged to implement their own caching of
 907      * images by using the {@link #createImage(java.lang.String) createImage}
 908      * variant wherever available.
 909      * If the image data contained in the specified file changes,
 910      * the <code>Image</code> object returned from this method may
 911      * still contain stale information which was loaded from the
 912      * file after a prior call.
 913      * Previously loaded image data can be manually discarded by
 914      * calling the {@link Image#flush flush} method on the
 915      * returned <code>Image</code>.
 916      * <p>
 917      * This method first checks if there is a security manager installed.
 918      * If so, the method calls the security manager's
 919      * <code>checkRead</code> method with the file specified to ensure
 920      * that the access to the image is allowed.
 921      * @param     filename   the name of a file containing pixel data
 922      *                         in a recognized file format.
 923      * @return    an image which gets its pixel data from
 924      *                         the specified file.
 925      * @throws SecurityException  if a security manager exists and its
 926      *                            checkRead method doesn't allow the operation.
 927      * @see #createImage(java.lang.String)
 928      */
 929     public abstract Image getImage(String filename);
 930 
 931     /**
 932      * Returns an image which gets pixel data from the specified URL.
 933      * The pixel data referenced by the specified URL must be in one
 934      * of the following formats: GIF, JPEG or PNG.
 935      * The underlying toolkit attempts to resolve multiple requests
 936      * with the same URL to the same returned Image.
 937      * <p>
 938      * Since the mechanism required to facilitate this sharing of
 939      * <code>Image</code> objects may continue to hold onto images
 940      * that are no longer in use for an indefinite period of time,
 941      * developers are encouraged to implement their own caching of
 942      * images by using the {@link #createImage(java.net.URL) createImage}
 943      * variant wherever available.
 944      * If the image data stored at the specified URL changes,
 945      * the <code>Image</code> object returned from this method may
 946      * still contain stale information which was fetched from the
 947      * URL after a prior call.
 948      * Previously loaded image data can be manually discarded by
 949      * calling the {@link Image#flush flush} method on the
 950      * returned <code>Image</code>.
 951      * <p>
 952      * This method first checks if there is a security manager installed.
 953      * If so, the method calls the security manager's
 954      * <code>checkPermission</code> method with the
 955      * url.openConnection().getPermission() permission to ensure
 956      * that the access to the image is allowed. For compatibility
 957      * with pre-1.2 security managers, if the access is denied with
 958      * <code>FilePermission</code> or <code>SocketPermission</code>,
 959      * the method throws the <code>SecurityException</code>
 960      * if the corresponding 1.1-style SecurityManager.checkXXX method
 961      * also denies permission.
 962      * @param     url   the URL to use in fetching the pixel data.
 963      * @return    an image which gets its pixel data from
 964      *                         the specified URL.
 965      * @throws SecurityException  if a security manager exists and its
 966      *                            checkPermission method doesn't allow
 967      *                            the operation.
 968      * @see #createImage(java.net.URL)
 969      */
 970     public abstract Image getImage(URL url);
 971 
 972     /**
 973      * Returns an image which gets pixel data from the specified file.
 974      * The returned Image is a new object which will not be shared
 975      * with any other caller of this method or its getImage variant.
 976      * <p>
 977      * This method first checks if there is a security manager installed.
 978      * If so, the method calls the security manager's
 979      * <code>checkRead</code> method with the specified file to ensure
 980      * that the image creation is allowed.
 981      * @param     filename   the name of a file containing pixel data
 982      *                         in a recognized file format.
 983      * @return    an image which gets its pixel data from
 984      *                         the specified file.
 985      * @throws SecurityException  if a security manager exists and its
 986      *                            checkRead method doesn't allow the operation.
 987      * @see #getImage(java.lang.String)
 988      */
 989     public abstract Image createImage(String filename);
 990 
 991     /**
 992      * Returns an image which gets pixel data from the specified URL.
 993      * The returned Image is a new object which will not be shared
 994      * with any other caller of this method or its getImage variant.
 995      * <p>
 996      * This method first checks if there is a security manager installed.
 997      * If so, the method calls the security manager's
 998      * <code>checkPermission</code> method with the
 999      * url.openConnection().getPermission() permission to ensure
1000      * that the image creation is allowed. For compatibility
1001      * with pre-1.2 security managers, if the access is denied with
1002      * <code>FilePermission</code> or <code>SocketPermission</code>,
1003      * the method throws <code>SecurityException</code>
1004      * if the corresponding 1.1-style SecurityManager.checkXXX method
1005      * also denies permission.
1006      * @param     url   the URL to use in fetching the pixel data.
1007      * @return    an image which gets its pixel data from
1008      *                         the specified URL.
1009      * @throws SecurityException  if a security manager exists and its
1010      *                            checkPermission method doesn't allow
1011      *                            the operation.
1012      * @see #getImage(java.net.URL)
1013      */
1014     public abstract Image createImage(URL url);
1015 
1016     /**
1017      * Prepares an image for rendering.
1018      * <p>
1019      * If the values of the width and height arguments are both
1020      * <code>-1</code>, this method prepares the image for rendering
1021      * on the default screen; otherwise, this method prepares an image
1022      * for rendering on the default screen at the specified width and height.
1023      * <p>
1024      * The image data is downloaded asynchronously in another thread,
1025      * and an appropriately scaled screen representation of the image is
1026      * generated.
1027      * <p>
1028      * This method is called by components <code>prepareImage</code>
1029      * methods.
1030      * <p>
1031      * Information on the flags returned by this method can be found
1032      * with the definition of the <code>ImageObserver</code> interface.
1033 
1034      * @param     image      the image for which to prepare a
1035      *                           screen representation.
1036      * @param     width      the width of the desired screen
1037      *                           representation, or <code>-1</code>.
1038      * @param     height     the height of the desired screen
1039      *                           representation, or <code>-1</code>.
1040      * @param     observer   the <code>ImageObserver</code>
1041      *                           object to be notified as the
1042      *                           image is being prepared.
1043      * @return    <code>true</code> if the image has already been
1044      *                 fully prepared; <code>false</code> otherwise.
1045      * @see       java.awt.Component#prepareImage(java.awt.Image,
1046      *                 java.awt.image.ImageObserver)
1047      * @see       java.awt.Component#prepareImage(java.awt.Image,
1048      *                 int, int, java.awt.image.ImageObserver)
1049      * @see       java.awt.image.ImageObserver
1050      */
1051     public abstract boolean prepareImage(Image image, int width, int height,
1052                                          ImageObserver observer);
1053 
1054     /**
1055      * Indicates the construction status of a specified image that is
1056      * being prepared for display.
1057      * <p>
1058      * If the values of the width and height arguments are both
1059      * <code>-1</code>, this method returns the construction status of
1060      * a screen representation of the specified image in this toolkit.
1061      * Otherwise, this method returns the construction status of a
1062      * scaled representation of the image at the specified width
1063      * and height.
1064      * <p>
1065      * This method does not cause the image to begin loading.
1066      * An application must call <code>prepareImage</code> to force
1067      * the loading of an image.
1068      * <p>
1069      * This method is called by the component's <code>checkImage</code>
1070      * methods.
1071      * <p>
1072      * Information on the flags returned by this method can be found
1073      * with the definition of the <code>ImageObserver</code> interface.
1074      * @param     image   the image whose status is being checked.
1075      * @param     width   the width of the scaled version whose status is
1076      *                 being checked, or <code>-1</code>.
1077      * @param     height  the height of the scaled version whose status
1078      *                 is being checked, or <code>-1</code>.
1079      * @param     observer   the <code>ImageObserver</code> object to be
1080      *                 notified as the image is being prepared.
1081      * @return    the bitwise inclusive <strong>OR</strong> of the
1082      *                 <code>ImageObserver</code> flags for the
1083      *                 image data that is currently available.
1084      * @see       java.awt.Toolkit#prepareImage(java.awt.Image,
1085      *                 int, int, java.awt.image.ImageObserver)
1086      * @see       java.awt.Component#checkImage(java.awt.Image,
1087      *                 java.awt.image.ImageObserver)
1088      * @see       java.awt.Component#checkImage(java.awt.Image,
1089      *                 int, int, java.awt.image.ImageObserver)
1090      * @see       java.awt.image.ImageObserver
1091      */
1092     public abstract int checkImage(Image image, int width, int height,
1093                                    ImageObserver observer);
1094 
1095     /**
1096      * Creates an image with the specified image producer.
1097      * @param     producer the image producer to be used.
1098      * @return    an image with the specified image producer.
1099      * @see       java.awt.Image
1100      * @see       java.awt.image.ImageProducer
1101      * @see       java.awt.Component#createImage(java.awt.image.ImageProducer)
1102      */
1103     public abstract Image createImage(ImageProducer producer);
1104 
1105     /**
1106      * Creates an image which decodes the image stored in the specified
1107      * byte array.
1108      * <p>
1109      * The data must be in some image format, such as GIF or JPEG,
1110      * that is supported by this toolkit.
1111      * @param     imagedata   an array of bytes, representing
1112      *                         image data in a supported image format.
1113      * @return    an image.
1114      * @since     JDK1.1
1115      */
1116     public Image createImage(byte[] imagedata) {
1117         return createImage(imagedata, 0, imagedata.length);
1118     }
1119 
1120     /**
1121      * Creates an image which decodes the image stored in the specified
1122      * byte array, and at the specified offset and length.
1123      * The data must be in some image format, such as GIF or JPEG,
1124      * that is supported by this toolkit.
1125      * @param     imagedata   an array of bytes, representing
1126      *                         image data in a supported image format.
1127      * @param     imageoffset  the offset of the beginning
1128      *                         of the data in the array.
1129      * @param     imagelength  the length of the data in the array.
1130      * @return    an image.
1131      * @since     JDK1.1
1132      */
1133     public abstract Image createImage(byte[] imagedata,
1134                                       int imageoffset,
1135                                       int imagelength);
1136 
1137     /**
1138      * Gets a <code>PrintJob</code> object which is the result of initiating
1139      * a print operation on the toolkit's platform.
1140      * <p>
1141      * Each actual implementation of this method should first check if there
1142      * is a security manager installed. If there is, the method should call
1143      * the security manager's <code>checkPrintJobAccess</code> method to
1144      * ensure initiation of a print operation is allowed. If the default
1145      * implementation of <code>checkPrintJobAccess</code> is used (that is,
1146      * that method is not overriden), then this results in a call to the
1147      * security manager's <code>checkPermission</code> method with a <code>
1148      * RuntimePermission("queuePrintJob")</code> permission.
1149      *
1150      * @param   frame the parent of the print dialog. May not be null.
1151      * @param   jobtitle the title of the PrintJob. A null title is equivalent
1152      *          to "".
1153      * @param   props a Properties object containing zero or more properties.
1154      *          Properties are not standardized and are not consistent across
1155      *          implementations. Because of this, PrintJobs which require job
1156      *          and page control should use the version of this function which
1157      *          takes JobAttributes and PageAttributes objects. This object
1158      *          may be updated to reflect the user's job choices on exit. May
1159      *          be null.
1160      *
1161      * @return  a <code>PrintJob</code> object, or <code>null</code> if the
1162      *          user cancelled the print job.
1163      * @throws  NullPointerException if frame is null.  This exception is
1164      *          always thrown when GraphicsEnvironment.isHeadless() returns
1165      *          true.
1166      * @throws  SecurityException if this thread is not allowed to initiate a
1167      *          print job request
1168      * @see     java.awt.GraphicsEnvironment#isHeadless
1169      * @see     java.awt.PrintJob
1170      * @see     java.lang.RuntimePermission
1171      * @since   JDK1.1
1172      */
1173     public abstract PrintJob getPrintJob(Frame frame, String jobtitle,
1174                                          Properties props);
1175 
1176     /**
1177      * Gets a <code>PrintJob</code> object which is the result of initiating
1178      * a print operation on the toolkit's platform.
1179      * <p>
1180      * Each actual implementation of this method should first check if there
1181      * is a security manager installed. If there is, the method should call
1182      * the security manager's <code>checkPrintJobAccess</code> method to
1183      * ensure initiation of a print operation is allowed. If the default
1184      * implementation of <code>checkPrintJobAccess</code> is used (that is,
1185      * that method is not overriden), then this results in a call to the
1186      * security manager's <code>checkPermission</code> method with a <code>
1187      * RuntimePermission("queuePrintJob")</code> permission.
1188      *
1189      * @param   frame the parent of the print dialog. May be null if and only
1190      *          if jobAttributes is not null and jobAttributes.getDialog()
1191      *          returns JobAttributes.DialogType.NONE or
1192      *          JobAttributes.DialogType.COMMON.
1193      * @param   jobtitle the title of the PrintJob. A null title is equivalent
1194      *          to "".
1195      * @param   jobAttributes a set of job attributes which will control the
1196      *          PrintJob. The attributes will be updated to reflect the user's
1197      *          choices as outlined in the JobAttributes documentation. May be
1198      *          null.
1199      * @param   pageAttributes a set of page attributes which will control the
1200      *          PrintJob. The attributes will be applied to every page in the
1201      *          job. The attributes will be updated to reflect the user's
1202      *          choices as outlined in the PageAttributes documentation. May be
1203      *          null.
1204      *
1205      * @return  a <code>PrintJob</code> object, or <code>null</code> if the
1206      *          user cancelled the print job.
1207      * @throws  NullPointerException if frame is null and either jobAttributes
1208      *          is null or jobAttributes.getDialog() returns
1209      *          JobAttributes.DialogType.NATIVE.
1210      * @throws  IllegalArgumentException if pageAttributes specifies differing
1211      *          cross feed and feed resolutions. Also if this thread has
1212      *          access to the file system and jobAttributes specifies
1213      *          print to file, and the specified destination file exists but
1214      *          is a directory rather than a regular file, does not exist but
1215      *          cannot be created, or cannot be opened for any other reason.
1216      *          However in the case of print to file, if a dialog is also
1217      *          requested to be displayed then the user will be given an
1218      *          opportunity to select a file and proceed with printing.
1219      *          The dialog will ensure that the selected output file
1220      *          is valid before returning from this method.
1221      *          <p>
1222      *          This exception is always thrown when GraphicsEnvironment.isHeadless()
1223      *          returns true.
1224      * @throws  SecurityException if this thread is not allowed to initiate a
1225      *          print job request, or if jobAttributes specifies print to file,
1226      *          and this thread is not allowed to access the file system
1227      * @see     java.awt.PrintJob
1228      * @see     java.awt.GraphicsEnvironment#isHeadless
1229      * @see     java.lang.RuntimePermission
1230      * @see     java.awt.JobAttributes
1231      * @see     java.awt.PageAttributes
1232      * @since   1.3
1233      */
1234     public PrintJob getPrintJob(Frame frame, String jobtitle,
1235                                 JobAttributes jobAttributes,
1236                                 PageAttributes pageAttributes) {
1237         // Override to add printing support with new job/page control classes
1238 
1239         if (GraphicsEnvironment.isHeadless()) {
1240             throw new IllegalArgumentException();
1241         }
1242 
1243         if (this != Toolkit.getDefaultToolkit()) {
1244             return Toolkit.getDefaultToolkit().getPrintJob(frame, jobtitle,
1245                                                            jobAttributes,
1246                                                            pageAttributes);
1247         } else {
1248             return getPrintJob(frame, jobtitle, null);
1249         }
1250     }
1251 
1252     /**
1253      * Emits an audio beep.
1254      * @since     JDK1.1
1255      */
1256     public abstract void beep();
1257 
1258     /**
1259      * Gets the singleton instance of the system Clipboard which interfaces
1260      * with clipboard facilities provided by the native platform. This
1261      * clipboard enables data transfer between Java programs and native
1262      * applications which use native clipboard facilities.
1263      * <p>
1264      * In addition to any and all formats specified in the flavormap.properties
1265      * file, or other file specified by the <code>AWT.DnD.flavorMapFileURL
1266      * </code> Toolkit property, text returned by the system Clipboard's <code>
1267      * getTransferData()</code> method is available in the following flavors:
1268      * <ul>
1269      * <li>DataFlavor.stringFlavor</li>
1270      * <li>DataFlavor.plainTextFlavor (<b>deprecated</b>)</li>
1271      * </ul>
1272      * As with <code>java.awt.datatransfer.StringSelection</code>, if the
1273      * requested flavor is <code>DataFlavor.plainTextFlavor</code>, or an
1274      * equivalent flavor, a Reader is returned. <b>Note:</b> The behavior of
1275      * the system Clipboard's <code>getTransferData()</code> method for <code>
1276      * DataFlavor.plainTextFlavor</code>, and equivalent DataFlavors, is
1277      * inconsistent with the definition of <code>DataFlavor.plainTextFlavor
1278      * </code>. Because of this, support for <code>
1279      * DataFlavor.plainTextFlavor</code>, and equivalent flavors, is
1280      * <b>deprecated</b>.
1281      * <p>
1282      * Each actual implementation of this method should first check if there
1283      * is a security manager installed. If there is, the method should call
1284      * the security manager's <code>checkSystemClipboardAccess</code> method
1285      * to ensure it's ok to to access the system clipboard. If the default
1286      * implementation of <code>checkSystemClipboardAccess</code> is used (that
1287      * is, that method is not overriden), then this results in a call to the
1288      * security manager's <code>checkPermission</code> method with an <code>
1289      * AWTPermission("accessClipboard")</code> permission.
1290      *
1291      * @return    the system Clipboard
1292      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1293      * returns true
1294      * @see       java.awt.GraphicsEnvironment#isHeadless
1295      * @see       java.awt.datatransfer.Clipboard
1296      * @see       java.awt.datatransfer.StringSelection
1297      * @see       java.awt.datatransfer.DataFlavor#stringFlavor
1298      * @see       java.awt.datatransfer.DataFlavor#plainTextFlavor
1299      * @see       java.io.Reader
1300      * @see       java.awt.AWTPermission
1301      * @since     JDK1.1
1302      */
1303     public abstract Clipboard getSystemClipboard()
1304         throws HeadlessException;
1305 
1306     /**
1307      * Gets the singleton instance of the system selection as a
1308      * <code>Clipboard</code> object. This allows an application to read and
1309      * modify the current, system-wide selection.
1310      * <p>
1311      * An application is responsible for updating the system selection whenever
1312      * the user selects text, using either the mouse or the keyboard.
1313      * Typically, this is implemented by installing a
1314      * <code>FocusListener</code> on all <code>Component</code>s which support
1315      * text selection, and, between <code>FOCUS_GAINED</code> and
1316      * <code>FOCUS_LOST</code> events delivered to that <code>Component</code>,
1317      * updating the system selection <code>Clipboard</code> when the selection
1318      * changes inside the <code>Component</code>. Properly updating the system
1319      * selection ensures that a Java application will interact correctly with
1320      * native applications and other Java applications running simultaneously
1321      * on the system. Note that <code>java.awt.TextComponent</code> and
1322      * <code>javax.swing.text.JTextComponent</code> already adhere to this
1323      * policy. When using these classes, and their subclasses, developers need
1324      * not write any additional code.
1325      * <p>
1326      * Some platforms do not support a system selection <code>Clipboard</code>.
1327      * On those platforms, this method will return <code>null</code>. In such a
1328      * case, an application is absolved from its responsibility to update the
1329      * system selection <code>Clipboard</code> as described above.
1330      * <p>
1331      * Each actual implementation of this method should first check if there
1332      * is a <code>SecurityManager</code> installed. If there is, the method
1333      * should call the <code>SecurityManager</code>'s
1334      * <code>checkSystemClipboardAccess</code> method to ensure that client
1335      * code has access the system selection. If the default implementation of
1336      * <code>checkSystemClipboardAccess</code> is used (that is, if the method
1337      * is not overridden), then this results in a call to the
1338      * <code>SecurityManager</code>'s <code>checkPermission</code> method with
1339      * an <code>AWTPermission("accessClipboard")</code> permission.
1340      *
1341      * @return the system selection as a <code>Clipboard</code>, or
1342      *         <code>null</code> if the native platform does not support a
1343      *         system selection <code>Clipboard</code>
1344      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1345      *            returns true
1346      *
1347      * @see java.awt.datatransfer.Clipboard
1348      * @see java.awt.event.FocusListener
1349      * @see java.awt.event.FocusEvent#FOCUS_GAINED
1350      * @see java.awt.event.FocusEvent#FOCUS_LOST
1351      * @see TextComponent
1352      * @see javax.swing.text.JTextComponent
1353      * @see AWTPermission
1354      * @see GraphicsEnvironment#isHeadless
1355      * @since 1.4
1356      */
1357     public Clipboard getSystemSelection() throws HeadlessException {
1358         if (this != Toolkit.getDefaultToolkit()) {
1359             return Toolkit.getDefaultToolkit().getSystemSelection();
1360         } else {
1361             GraphicsEnvironment.checkHeadless();
1362             return null;
1363         }
1364     }
1365 
1366     /**
1367      * Determines which modifier key is the appropriate accelerator
1368      * key for menu shortcuts.
1369      * <p>
1370      * Menu shortcuts, which are embodied in the
1371      * <code>MenuShortcut</code> class, are handled by the
1372      * <code>MenuBar</code> class.
1373      * <p>
1374      * By default, this method returns <code>Event.CTRL_MASK</code>.
1375      * Toolkit implementations should override this method if the
1376      * <b>Control</b> key isn't the correct key for accelerators.
1377      * @return    the modifier mask on the <code>Event</code> class
1378      *                 that is used for menu shortcuts on this toolkit.
1379      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1380      * returns true
1381      * @see       java.awt.GraphicsEnvironment#isHeadless
1382      * @see       java.awt.MenuBar
1383      * @see       java.awt.MenuShortcut
1384      * @since     JDK1.1
1385      */
1386     public int getMenuShortcutKeyMask() throws HeadlessException {
1387         return Event.CTRL_MASK;
1388     }
1389 
1390     /**
1391      * Returns whether the given locking key on the keyboard is currently in
1392      * its "on" state.
1393      * Valid key codes are
1394      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1395      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1396      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1397      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1398      *
1399      * @exception java.lang.IllegalArgumentException if <code>keyCode</code>
1400      * is not one of the valid key codes
1401      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1402      * allow getting the state of this key programmatically, or if the keyboard
1403      * doesn't have this key
1404      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1405      * returns true
1406      * @see       java.awt.GraphicsEnvironment#isHeadless
1407      * @since 1.3
1408      */
1409     public boolean getLockingKeyState(int keyCode)
1410         throws UnsupportedOperationException {
1411         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1412                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1413             throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
1414         }
1415         throw new UnsupportedOperationException("Toolkit.getLockingKeyState");
1416     }
1417 
1418     /**
1419      * Sets the state of the given locking key on the keyboard.
1420      * Valid key codes are
1421      * {@link java.awt.event.KeyEvent#VK_CAPS_LOCK VK_CAPS_LOCK},
1422      * {@link java.awt.event.KeyEvent#VK_NUM_LOCK VK_NUM_LOCK},
1423      * {@link java.awt.event.KeyEvent#VK_SCROLL_LOCK VK_SCROLL_LOCK}, and
1424      * {@link java.awt.event.KeyEvent#VK_KANA_LOCK VK_KANA_LOCK}.
1425      * <p>
1426      * Depending on the platform, setting the state of a locking key may
1427      * involve event processing and therefore may not be immediately
1428      * observable through getLockingKeyState.
1429      *
1430      * @exception java.lang.IllegalArgumentException if <code>keyCode</code>
1431      * is not one of the valid key codes
1432      * @exception java.lang.UnsupportedOperationException if the host system doesn't
1433      * allow setting the state of this key programmatically, or if the keyboard
1434      * doesn't have this key
1435      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1436      * returns true
1437      * @see       java.awt.GraphicsEnvironment#isHeadless
1438      * @since 1.3
1439      */
1440     public void setLockingKeyState(int keyCode, boolean on)
1441         throws UnsupportedOperationException {
1442         if (! (keyCode == KeyEvent.VK_CAPS_LOCK || keyCode == KeyEvent.VK_NUM_LOCK ||
1443                keyCode == KeyEvent.VK_SCROLL_LOCK || keyCode == KeyEvent.VK_KANA_LOCK)) {
1444             throw new IllegalArgumentException("invalid key for Toolkit.setLockingKeyState");
1445         }
1446         throw new UnsupportedOperationException("Toolkit.setLockingKeyState");
1447     }
1448 
1449     /**
1450      * Give native peers the ability to query the native container
1451      * given a native component (eg the direct parent may be lightweight).
1452      */
1453     protected static Container getNativeContainer(Component c) {
1454         return c.getNativeContainer();
1455     }
1456 
1457     /**
1458      * Creates a new custom cursor object.
1459      * If the image to display is invalid, the cursor will be hidden (made
1460      * completely transparent), and the hotspot will be set to (0, 0).
1461      *
1462      * <p>Note that multi-frame images are invalid and may cause this
1463      * method to hang.
1464      *
1465      * @param cursor the image to display when the cursor is actived
1466      * @param hotSpot the X and Y of the large cursor's hot spot; the
1467      *   hotSpot values must be less than the Dimension returned by
1468      *   <code>getBestCursorSize</code>
1469      * @param     name a localized description of the cursor, for Java Accessibility use
1470      * @exception IndexOutOfBoundsException if the hotSpot values are outside
1471      *   the bounds of the cursor
1472      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1473      * returns true
1474      * @see       java.awt.GraphicsEnvironment#isHeadless
1475      * @since     1.2
1476      */
1477     public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
1478         throws IndexOutOfBoundsException, HeadlessException
1479     {
1480         // Override to implement custom cursor support.
1481         if (this != Toolkit.getDefaultToolkit()) {
1482             return Toolkit.getDefaultToolkit().
1483                 createCustomCursor(cursor, hotSpot, name);
1484         } else {
1485             return new Cursor(Cursor.DEFAULT_CURSOR);
1486         }
1487     }
1488 
1489     /**
1490      * Returns the supported cursor dimension which is closest to the desired
1491      * sizes.  Systems which only support a single cursor size will return that
1492      * size regardless of the desired sizes.  Systems which don't support custom
1493      * cursors will return a dimension of 0, 0. <p>
1494      * Note:  if an image is used whose dimensions don't match a supported size
1495      * (as returned by this method), the Toolkit implementation will attempt to
1496      * resize the image to a supported size.
1497      * Since converting low-resolution images is difficult,
1498      * no guarantees are made as to the quality of a cursor image which isn't a
1499      * supported size.  It is therefore recommended that this method
1500      * be called and an appropriate image used so no image conversion is made.
1501      *
1502      * @param     preferredWidth the preferred cursor width the component would like
1503      * to use.
1504      * @param     preferredHeight the preferred cursor height the component would like
1505      * to use.
1506      * @return    the closest matching supported cursor size, or a dimension of 0,0 if
1507      * the Toolkit implementation doesn't support custom cursors.
1508      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1509      * returns true
1510      * @see       java.awt.GraphicsEnvironment#isHeadless
1511      * @since     1.2
1512      */
1513     public Dimension getBestCursorSize(int preferredWidth,
1514         int preferredHeight) throws HeadlessException {
1515         // Override to implement custom cursor support.
1516         if (this != Toolkit.getDefaultToolkit()) {
1517             return Toolkit.getDefaultToolkit().
1518                 getBestCursorSize(preferredWidth, preferredHeight);
1519         } else {
1520             return new Dimension(0, 0);
1521         }
1522     }
1523 
1524     /**
1525      * Returns the maximum number of colors the Toolkit supports in a custom cursor
1526      * palette.<p>
1527      * Note: if an image is used which has more colors in its palette than
1528      * the supported maximum, the Toolkit implementation will attempt to flatten the
1529      * palette to the maximum.  Since converting low-resolution images is difficult,
1530      * no guarantees are made as to the quality of a cursor image which has more
1531      * colors than the system supports.  It is therefore recommended that this method
1532      * be called and an appropriate image used so no image conversion is made.
1533      *
1534      * @return    the maximum number of colors, or zero if custom cursors are not
1535      * supported by this Toolkit implementation.
1536      * @exception HeadlessException if GraphicsEnvironment.isHeadless()
1537      * returns true
1538      * @see       java.awt.GraphicsEnvironment#isHeadless
1539      * @since     1.2
1540      */
1541     public int getMaximumCursorColors() throws HeadlessException {
1542         // Override to implement custom cursor support.
1543         if (this != Toolkit.getDefaultToolkit()) {
1544             return Toolkit.getDefaultToolkit().getMaximumCursorColors();
1545         } else {
1546             return 0;
1547         }
1548     }
1549 
1550     /**
1551      * Returns whether Toolkit supports this state for
1552      * <code>Frame</code>s.  This method tells whether the <em>UI
1553      * concept</em> of, say, maximization or iconification is
1554      * supported.  It will always return false for "compound" states
1555      * like <code>Frame.ICONIFIED|Frame.MAXIMIZED_VERT</code>.
1556      * In other words, the rule of thumb is that only queries with a
1557      * single frame state constant as an argument are meaningful.
1558      * <p>Note that supporting a given concept is a platform-
1559      * dependent feature. Due to native limitations the Toolkit
1560      * object may report a particular state as supported, however at
1561      * the same time the Toolkit object will be unable to apply the
1562      * state to a given frame.  This circumstance has two following
1563      * consequences:
1564      * <ul>
1565      * <li>Only the return value of {@code false} for the present
1566      * method actually indicates that the given state is not
1567      * supported. If the method returns {@code true} the given state
1568      * may still be unsupported and/or unavailable for a particular
1569      * frame.
1570      * <li>The developer should consider examining the value of the
1571      * {@link java.awt.event.WindowEvent#getNewState} method of the
1572      * {@code WindowEvent} received through the {@link
1573      * java.awt.event.WindowStateListener}, rather than assuming
1574      * that the state given to the {@code setExtendedState()} method
1575      * will be definitely applied. For more information see the
1576      * documentation for the {@link Frame#setExtendedState} method.
1577      * </ul>
1578      *
1579      * @param state one of named frame state constants.
1580      * @return <code>true</code> is this frame state is supported by
1581      *     this Toolkit implementation, <code>false</code> otherwise.
1582      * @exception HeadlessException
1583      *     if <code>GraphicsEnvironment.isHeadless()</code>
1584      *     returns <code>true</code>.
1585      * @see java.awt.Window#addWindowStateListener
1586      * @since   1.4
1587      */
1588     public boolean isFrameStateSupported(int state)
1589         throws HeadlessException
1590     {
1591         if (GraphicsEnvironment.isHeadless()){
1592             throw new HeadlessException();
1593         }
1594         if (this != Toolkit.getDefaultToolkit()) {
1595             return Toolkit.getDefaultToolkit().
1596                 isFrameStateSupported(state);
1597         } else {
1598             return (state == Frame.NORMAL); // others are not guaranteed
1599         }
1600     }
1601 
1602     /**
1603      * Support for I18N: any visible strings should be stored in
1604      * sun.awt.resources.awt.properties.  The ResourceBundle is stored
1605      * here, so that only one copy is maintained.
1606      */
1607     private static ResourceBundle resources;
1608 
1609     /**
1610      * Initialize JNI field and method ids
1611      */
1612     private static native void initIDs();
1613 
1614     /**
1615      * WARNING: This is a temporary workaround for a problem in the
1616      * way the AWT loads native libraries. A number of classes in the
1617      * AWT package have a native method, initIDs(), which initializes
1618      * the JNI field and method ids used in the native portion of
1619      * their implementation.
1620      *
1621      * Since the use and storage of these ids is done by the
1622      * implementation libraries, the implementation of these method is
1623      * provided by the particular AWT implementations (for example,
1624      * "Toolkit"s/Peer), such as Motif, Microsoft Windows, or Tiny. The
1625      * problem is that this means that the native libraries must be
1626      * loaded by the java.* classes, which do not necessarily know the
1627      * names of the libraries to load. A better way of doing this
1628      * would be to provide a separate library which defines java.awt.*
1629      * initIDs, and exports the relevant symbols out to the
1630      * implementation libraries.
1631      *
1632      * For now, we know it's done by the implementation, and we assume
1633      * that the name of the library is "awt".  -br.
1634      *
1635      * If you change loadLibraries(), please add the change to
1636      * java.awt.image.ColorModel.loadLibraries(). Unfortunately,
1637      * classes can be loaded in java.awt.image that depend on
1638      * libawt and there is no way to call Toolkit.loadLibraries()
1639      * directly.  -hung
1640      */
1641     private static boolean loaded = false;
1642     static void loadLibraries() {
1643         if (!loaded) {
1644             java.security.AccessController.doPrivileged(
1645                           new sun.security.action.LoadLibraryAction("awt"));
1646             loaded = true;
1647         }
1648     }
1649 
1650     static {
1651         java.security.AccessController.doPrivileged(
1652                                  new java.security.PrivilegedAction() {
1653             public Object run() {
1654                 try {
1655                     resources =
1656                         ResourceBundle.getBundle("sun.awt.resources.awt",
1657                                                  CoreResourceBundleControl.getRBControlInstance());
1658                 } catch (MissingResourceException e) {
1659                     // No resource file; defaults will be used.
1660                 }
1661                 return null;
1662             }
1663         });
1664 
1665         // ensure that the proper libraries are loaded
1666         loadLibraries();
1667         initAssistiveTechnologies();
1668         if (!GraphicsEnvironment.isHeadless()) {
1669             initIDs();
1670         }
1671     }
1672 
1673     /**
1674      * Gets a property with the specified key and default.
1675      * This method returns defaultValue if the property is not found.
1676      */
1677     public static String getProperty(String key, String defaultValue) {
1678         if (resources != null) {
1679             try {
1680                 return resources.getString(key);
1681             }
1682             catch (MissingResourceException e) {}
1683         }
1684 
1685         return defaultValue;
1686     }
1687 
1688     /**
1689      * Get the application's or applet's EventQueue instance.
1690      * Depending on the Toolkit implementation, different EventQueues
1691      * may be returned for different applets.  Applets should
1692      * therefore not assume that the EventQueue instance returned
1693      * by this method will be shared by other applets or the system.
1694      *
1695      * <p>First, if there is a security manager, its
1696      * <code>checkAwtEventQueueAccess</code>
1697      * method is called.
1698      * If  the default implementation of <code>checkAwtEventQueueAccess</code>
1699      * is used (that is, that method is not overriden), then this results in
1700      * a call to the security manager's <code>checkPermission</code> method
1701      * with an <code>AWTPermission("accessEventQueue")</code> permission.
1702      *
1703      * @return    the <code>EventQueue</code> object
1704      * @throws  SecurityException
1705      *          if a security manager exists and its <code>{@link
1706      *          java.lang.SecurityManager#checkAwtEventQueueAccess}</code>
1707      *          method denies access to the <code>EventQueue</code>
1708      * @see     java.awt.AWTPermission
1709     */
1710     public final EventQueue getSystemEventQueue() {
1711         SecurityManager security = System.getSecurityManager();
1712         if (security != null) {
1713           security.checkAwtEventQueueAccess();
1714         }
1715         return getSystemEventQueueImpl();
1716     }
1717 
1718     /**
1719      * Gets the application's or applet's <code>EventQueue</code>
1720      * instance, without checking access.  For security reasons,
1721      * this can only be called from a <code>Toolkit</code> subclass.
1722      * @return the <code>EventQueue</code> object
1723      */
1724     protected abstract EventQueue getSystemEventQueueImpl();
1725 
1726     /* Accessor method for use by AWT package routines. */
1727     static EventQueue getEventQueue() {
1728         return getDefaultToolkit().getSystemEventQueueImpl();
1729     }
1730 
1731     /**
1732      * Creates the peer for a DragSourceContext.
1733      * Always throws InvalidDndOperationException if
1734      * GraphicsEnvironment.isHeadless() returns true.
1735      * @see java.awt.GraphicsEnvironment#isHeadless
1736      */
1737     public abstract DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException;
1738 
1739     /**
1740      * Creates a concrete, platform dependent, subclass of the abstract
1741      * DragGestureRecognizer class requested, and associates it with the
1742      * DragSource, Component and DragGestureListener specified.
1743      *
1744      * subclasses should override this to provide their own implementation
1745      *
1746      * @param abstractRecognizerClass The abstract class of the required recognizer
1747      * @param ds                      The DragSource
1748      * @param c                       The Component target for the DragGestureRecognizer
1749      * @param srcActions              The actions permitted for the gesture
1750      * @param dgl                     The DragGestureListener
1751      *
1752      * @return the new object or null.  Always returns null if
1753      * GraphicsEnvironment.isHeadless() returns true.
1754      * @see java.awt.GraphicsEnvironment#isHeadless
1755      */
1756     public <T extends DragGestureRecognizer> T
1757         createDragGestureRecognizer(Class<T> abstractRecognizerClass,
1758                                     DragSource ds, Component c, int srcActions,
1759                                     DragGestureListener dgl)
1760     {
1761         return null;
1762     }
1763 
1764     /**
1765      * Obtains a value for the specified desktop property.
1766      *
1767      * A desktop property is a uniquely named value for a resource that
1768      * is Toolkit global in nature. Usually it also is an abstract
1769      * representation for an underlying platform dependent desktop setting.
1770      * For more information on desktop properties supported by the AWT see
1771      * <a href="doc-files/DesktopProperties.html">AWT Desktop Properties</a>.
1772      */
1773     public final synchronized Object getDesktopProperty(String propertyName) {
1774         // This is a workaround for headless toolkits.  It would be
1775         // better to override this method but it is declared final.
1776         // "this instanceof" syntax defeats polymorphism.
1777         // --mm, 03/03/00
1778         if (this instanceof HeadlessToolkit) {
1779             return ((HeadlessToolkit)this).getUnderlyingToolkit()
1780                 .getDesktopProperty(propertyName);
1781         }
1782 
1783         if (desktopProperties.isEmpty()) {
1784             initializeDesktopProperties();
1785         }
1786 
1787         Object value;
1788 
1789         // This property should never be cached
1790         if (propertyName.equals("awt.dynamicLayoutSupported")) {
1791             value = lazilyLoadDesktopProperty(propertyName);
1792             return value;
1793         }
1794 
1795         value = desktopProperties.get(propertyName);
1796 
1797         if (value == null) {
1798             value = lazilyLoadDesktopProperty(propertyName);
1799 
1800             if (value != null) {
1801                 setDesktopProperty(propertyName, value);
1802             }
1803         }
1804 
1805         /* for property "awt.font.desktophints" */
1806         if (value instanceof RenderingHints) {
1807             value = ((RenderingHints)value).clone();
1808         }
1809 
1810         return value;
1811     }
1812 
1813     /**
1814      * Sets the named desktop property to the specified value and fires a
1815      * property change event to notify any listeners that the value has changed.
1816      */
1817     protected final void setDesktopProperty(String name, Object newValue) {
1818         // This is a workaround for headless toolkits.  It would be
1819         // better to override this method but it is declared final.
1820         // "this instanceof" syntax defeats polymorphism.
1821         // --mm, 03/03/00
1822         if (this instanceof HeadlessToolkit) {
1823             ((HeadlessToolkit)this).getUnderlyingToolkit()
1824                 .setDesktopProperty(name, newValue);
1825             return;
1826         }
1827         Object oldValue;
1828 
1829         synchronized (this) {
1830             oldValue = desktopProperties.get(name);
1831             desktopProperties.put(name, newValue);
1832         }
1833 
1834         // Don't fire change event if old and new values are null.
1835         // It helps to avoid recursive resending of WM_THEMECHANGED
1836         if (oldValue != null || newValue != null) {
1837             desktopPropsSupport.firePropertyChange(name, oldValue, newValue);
1838         }
1839     }
1840 
1841     /**
1842      * an opportunity to lazily evaluate desktop property values.
1843      */
1844     protected Object lazilyLoadDesktopProperty(String name) {
1845         return null;
1846     }
1847 
1848     /**
1849      * initializeDesktopProperties
1850      */
1851     protected void initializeDesktopProperties() {
1852     }
1853 
1854     /**
1855      * Adds the specified property change listener for the named desktop
1856      * property.
1857      * If pcl is null, no exception is thrown and no action is performed.
1858      *
1859      * @param   name The name of the property to listen for
1860      * @param   pcl The property change listener
1861      * @since   1.2
1862      */
1863     public void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
1864         desktopPropsSupport.addPropertyChangeListener(name, pcl);
1865     }
1866 
1867     /**
1868      * Removes the specified property change listener for the named
1869      * desktop property.
1870      * If pcl is null, no exception is thrown and no action is performed.
1871      *
1872      * @param   name The name of the property to remove
1873      * @param   pcl The property change listener
1874      * @since   1.2
1875      */
1876     public void removePropertyChangeListener(String name, PropertyChangeListener pcl) {
1877         desktopPropsSupport.removePropertyChangeListener(name, pcl);
1878     }
1879 
1880     /**
1881      * Returns an array of all the property change listeners
1882      * registered on this toolkit.
1883      *
1884      * @return all of this toolkit's <code>PropertyChangeListener</code>s
1885      *         or an empty array if no property change
1886      *         listeners are currently registered
1887      *
1888      * @since 1.4
1889      */
1890     public PropertyChangeListener[] getPropertyChangeListeners() {
1891         return desktopPropsSupport.getPropertyChangeListeners();
1892     }
1893 
1894     /**
1895      * Returns an array of all the <code>PropertyChangeListener</code>s
1896      * associated with the named property.
1897      *
1898      * @param  propertyName the named property
1899      * @return all of the <code>PropertyChangeListener</code>s associated with
1900      *         the named property or an empty array if no such listeners have
1901      *         been added
1902      * @since 1.4
1903      */
1904     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
1905         return desktopPropsSupport.getPropertyChangeListeners(propertyName);
1906     }
1907 
1908     protected final Map<String,Object> desktopProperties =
1909             new HashMap<String,Object>();
1910     protected final PropertyChangeSupport desktopPropsSupport =
1911             Toolkit.createPropertyChangeSupport(this);
1912 
1913     /**
1914      * Returns whether the always-on-top mode is supported by this toolkit.
1915      * To detect whether the always-on-top mode is supported for a
1916      * particular Window, use {@link Window#isAlwaysOnTopSupported}.
1917      * @return <code>true</code>, if current toolkit supports the always-on-top mode,
1918      *     otherwise returns <code>false</code>
1919      * @see Window#isAlwaysOnTopSupported
1920      * @see Window#setAlwaysOnTop(boolean)
1921      * @since 1.6
1922      */
1923     public boolean isAlwaysOnTopSupported() {
1924         return true;
1925     }
1926 
1927     /**
1928      * Returns whether the given modality type is supported by this toolkit. If
1929      * a dialog with unsupported modality type is created, then
1930      * <code>Dialog.ModalityType.MODELESS</code> is used instead.
1931      *
1932      * @param modalityType modality type to be checked for support by this toolkit
1933      *
1934      * @return <code>true</code>, if current toolkit supports given modality
1935      *     type, <code>false</code> otherwise
1936      *
1937      * @see java.awt.Dialog.ModalityType
1938      * @see java.awt.Dialog#getModalityType
1939      * @see java.awt.Dialog#setModalityType
1940      *
1941      * @since 1.6
1942      */
1943     public abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType);
1944 
1945     /**
1946      * Returns whether the given modal exclusion type is supported by this
1947      * toolkit. If an unsupported modal exclusion type property is set on a window,
1948      * then <code>Dialog.ModalExclusionType.NO_EXCLUDE</code> is used instead.
1949      *
1950      * @param modalExclusionType modal exclusion type to be checked for support by this toolkit
1951      *
1952      * @return <code>true</code>, if current toolkit supports given modal exclusion
1953      *     type, <code>false</code> otherwise
1954      *
1955      * @see java.awt.Dialog.ModalExclusionType
1956      * @see java.awt.Window#getModalExclusionType
1957      * @see java.awt.Window#setModalExclusionType
1958      *
1959      * @since 1.6
1960      */
1961     public abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType);
1962 
1963     private static final PlatformLogger log = PlatformLogger.getLogger("java.awt.Toolkit");
1964 
1965     private static final int LONG_BITS = 64;
1966     private int[] calls = new int[LONG_BITS];
1967     private static volatile long enabledOnToolkitMask;
1968     private AWTEventListener eventListener = null;
1969     private WeakHashMap listener2SelectiveListener = new WeakHashMap();
1970 
1971     /*
1972      * Extracts a "pure" AWTEventListener from a AWTEventListenerProxy,
1973      * if the listener is proxied.
1974      */
1975     static private AWTEventListener deProxyAWTEventListener(AWTEventListener l)
1976     {
1977         AWTEventListener localL = l;
1978 
1979         if (localL == null) {
1980             return null;
1981         }
1982         // if user passed in a AWTEventListenerProxy object, extract
1983         // the listener
1984         if (l instanceof AWTEventListenerProxy) {
1985             localL = ((AWTEventListenerProxy)l).getListener();
1986         }
1987         return localL;
1988     }
1989 
1990     /**
1991      * Adds an AWTEventListener to receive all AWTEvents dispatched
1992      * system-wide that conform to the given <code>eventMask</code>.
1993      * <p>
1994      * First, if there is a security manager, its <code>checkPermission</code>
1995      * method is called with an
1996      * <code>AWTPermission("listenToAllAWTEvents")</code> permission.
1997      * This may result in a SecurityException.
1998      * <p>
1999      * <code>eventMask</code> is a bitmask of event types to receive.
2000      * It is constructed by bitwise OR-ing together the event masks
2001      * defined in <code>AWTEvent</code>.
2002      * <p>
2003      * Note:  event listener use is not recommended for normal
2004      * application use, but are intended solely to support special
2005      * purpose facilities including support for accessibility,
2006      * event record/playback, and diagnostic tracing.
2007      *
2008      * If listener is null, no exception is thrown and no action is performed.
2009      *
2010      * @param    listener   the event listener.
2011      * @param    eventMask  the bitmask of event types to receive
2012      * @throws SecurityException
2013      *        if a security manager exists and its
2014      *        <code>checkPermission</code> method doesn't allow the operation.
2015      * @see      #removeAWTEventListener
2016      * @see      #getAWTEventListeners
2017      * @see      SecurityManager#checkPermission
2018      * @see      java.awt.AWTEvent
2019      * @see      java.awt.AWTPermission
2020      * @see      java.awt.event.AWTEventListener
2021      * @see      java.awt.event.AWTEventListenerProxy
2022      * @since    1.2
2023      */
2024     public void addAWTEventListener(AWTEventListener listener, long eventMask) {
2025         AWTEventListener localL = deProxyAWTEventListener(listener);
2026 
2027         if (localL == null) {
2028             return;
2029         }
2030         SecurityManager security = System.getSecurityManager();
2031         if (security != null) {
2032           security.checkPermission(SecurityConstants.AWT.ALL_AWT_EVENTS_PERMISSION);
2033         }
2034         synchronized (this) {
2035             SelectiveAWTEventListener selectiveListener =
2036             (SelectiveAWTEventListener)listener2SelectiveListener.get(localL);
2037 
2038             if (selectiveListener == null) {
2039                 // Create a new selectiveListener.
2040                 selectiveListener = new SelectiveAWTEventListener(localL,
2041                                                                  eventMask);
2042                 listener2SelectiveListener.put(localL, selectiveListener);
2043                 eventListener = ToolkitEventMulticaster.add(eventListener,
2044                                                             selectiveListener);
2045             }
2046             // OR the eventMask into the selectiveListener's event mask.
2047             selectiveListener.orEventMasks(eventMask);
2048 
2049             enabledOnToolkitMask |= eventMask;
2050 
2051             long mask = eventMask;
2052             for (int i=0; i<LONG_BITS; i++) {
2053                 // If no bits are set, break out of loop.
2054                 if (mask == 0) {
2055                     break;
2056                 }
2057                 if ((mask & 1L) != 0) {  // Always test bit 0.
2058                     calls[i]++;
2059                 }
2060                 mask >>>= 1;  // Right shift, fill with zeros on left.
2061             }
2062         }
2063     }
2064 
2065     /**
2066      * Removes an AWTEventListener from receiving dispatched AWTEvents.
2067      * <p>
2068      * First, if there is a security manager, its <code>checkPermission</code>
2069      * method is called with an
2070      * <code>AWTPermission("listenToAllAWTEvents")</code> permission.
2071      * This may result in a SecurityException.
2072      * <p>
2073      * Note:  event listener use is not recommended for normal
2074      * application use, but are intended solely to support special
2075      * purpose facilities including support for accessibility,
2076      * event record/playback, and diagnostic tracing.
2077      *
2078      * If listener is null, no exception is thrown and no action is performed.
2079      *
2080      * @param    listener   the event listener.
2081      * @throws SecurityException
2082      *        if a security manager exists and its
2083      *        <code>checkPermission</code> method doesn't allow the operation.
2084      * @see      #addAWTEventListener
2085      * @see      #getAWTEventListeners
2086      * @see      SecurityManager#checkPermission
2087      * @see      java.awt.AWTEvent
2088      * @see      java.awt.AWTPermission
2089      * @see      java.awt.event.AWTEventListener
2090      * @see      java.awt.event.AWTEventListenerProxy
2091      * @since    1.2
2092      */
2093     public void removeAWTEventListener(AWTEventListener listener) {
2094         AWTEventListener localL = deProxyAWTEventListener(listener);
2095 
2096         if (listener == null) {
2097             return;
2098         }
2099         SecurityManager security = System.getSecurityManager();
2100         if (security != null) {
2101             security.checkPermission(SecurityConstants.AWT.ALL_AWT_EVENTS_PERMISSION);
2102         }
2103 
2104         synchronized (this) {
2105             SelectiveAWTEventListener selectiveListener =
2106             (SelectiveAWTEventListener)listener2SelectiveListener.get(localL);
2107 
2108             if (selectiveListener != null) {
2109                 listener2SelectiveListener.remove(localL);
2110                 int[] listenerCalls = selectiveListener.getCalls();
2111                 for (int i=0; i<LONG_BITS; i++) {
2112                     calls[i] -= listenerCalls[i];
2113                     assert calls[i] >= 0: "Negative Listeners count";
2114 
2115                     if (calls[i] == 0) {
2116                         enabledOnToolkitMask &= ~(1L<<i);
2117                     }
2118                 }
2119             }
2120             eventListener = ToolkitEventMulticaster.remove(eventListener,
2121             (selectiveListener == null) ? localL : selectiveListener);
2122         }
2123     }
2124 
2125     static boolean enabledOnToolkit(long eventMask) {
2126         return (enabledOnToolkitMask & eventMask) != 0;
2127         }
2128 
2129     synchronized int countAWTEventListeners(long eventMask) {
2130         if (log.isLoggable(PlatformLogger.FINE)) {
2131             if (eventMask == 0) {
2132                 log.fine("Assertion (eventMask != 0) failed");
2133             }
2134         }
2135 
2136         int ci = 0;
2137         for (; eventMask != 0; eventMask >>>= 1, ci++) {
2138         }
2139         ci--;
2140         return calls[ci];
2141     }
2142     /**
2143      * Returns an array of all the <code>AWTEventListener</code>s
2144      * registered on this toolkit.
2145      * If there is a security manager, its {@code checkPermission}
2146      * method is called with an
2147      * {@code AWTPermission("listenToAllAWTEvents")} permission.
2148      * This may result in a SecurityException.
2149      * Listeners can be returned
2150      * within <code>AWTEventListenerProxy</code> objects, which also contain
2151      * the event mask for the given listener.
2152      * Note that listener objects
2153      * added multiple times appear only once in the returned array.
2154      *
2155      * @return all of the <code>AWTEventListener</code>s or an empty
2156      *         array if no listeners are currently registered
2157      * @throws SecurityException
2158      *        if a security manager exists and its
2159      *        <code>checkPermission</code> method doesn't allow the operation.
2160      * @see      #addAWTEventListener
2161      * @see      #removeAWTEventListener
2162      * @see      SecurityManager#checkPermission
2163      * @see      java.awt.AWTEvent
2164      * @see      java.awt.AWTPermission
2165      * @see      java.awt.event.AWTEventListener
2166      * @see      java.awt.event.AWTEventListenerProxy
2167      * @since 1.4
2168      */
2169     public AWTEventListener[] getAWTEventListeners() {
2170         SecurityManager security = System.getSecurityManager();
2171         if (security != null) {
2172             security.checkPermission(SecurityConstants.AWT.ALL_AWT_EVENTS_PERMISSION);
2173         }
2174         synchronized (this) {
2175             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
2176 
2177             AWTEventListener[] ret = new AWTEventListener[la.length];
2178             for (int i = 0; i < la.length; i++) {
2179                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
2180                 AWTEventListener tempL = sael.getListener();
2181                 //assert tempL is not an AWTEventListenerProxy - we should
2182                 // have weeded them all out
2183                 // don't want to wrap a proxy inside a proxy
2184                 ret[i] = new AWTEventListenerProxy(sael.getEventMask(), tempL);
2185             }
2186             return ret;
2187         }
2188     }
2189 
2190     /**
2191      * Returns an array of all the <code>AWTEventListener</code>s
2192      * registered on this toolkit which listen to all of the event
2193      * types specified in the {@code eventMask} argument.
2194      * If there is a security manager, its {@code checkPermission}
2195      * method is called with an
2196      * {@code AWTPermission("listenToAllAWTEvents")} permission.
2197      * This may result in a SecurityException.
2198      * Listeners can be returned
2199      * within <code>AWTEventListenerProxy</code> objects, which also contain
2200      * the event mask for the given listener.
2201      * Note that listener objects
2202      * added multiple times appear only once in the returned array.
2203      *
2204      * @param  eventMask the bitmask of event types to listen for
2205      * @return all of the <code>AWTEventListener</code>s registered
2206      *         on this toolkit for the specified
2207      *         event types, or an empty array if no such listeners
2208      *         are currently registered
2209      * @throws SecurityException
2210      *        if a security manager exists and its
2211      *        <code>checkPermission</code> method doesn't allow the operation.
2212      * @see      #addAWTEventListener
2213      * @see      #removeAWTEventListener
2214      * @see      SecurityManager#checkPermission
2215      * @see      java.awt.AWTEvent
2216      * @see      java.awt.AWTPermission
2217      * @see      java.awt.event.AWTEventListener
2218      * @see      java.awt.event.AWTEventListenerProxy
2219      * @since 1.4
2220      */
2221     public AWTEventListener[] getAWTEventListeners(long eventMask) {
2222         SecurityManager security = System.getSecurityManager();
2223         if (security != null) {
2224             security.checkPermission(SecurityConstants.AWT.ALL_AWT_EVENTS_PERMISSION);
2225         }
2226         synchronized (this) {
2227             EventListener[] la = ToolkitEventMulticaster.getListeners(eventListener,AWTEventListener.class);
2228 
2229             java.util.List list = new ArrayList(la.length);
2230 
2231             for (int i = 0; i < la.length; i++) {
2232                 SelectiveAWTEventListener sael = (SelectiveAWTEventListener)la[i];
2233                 if ((sael.getEventMask() & eventMask) == eventMask) {
2234                     //AWTEventListener tempL = sael.getListener();
2235                     list.add(new AWTEventListenerProxy(sael.getEventMask(),
2236                                                        sael.getListener()));
2237                 }
2238             }
2239             return (AWTEventListener[])list.toArray(new AWTEventListener[0]);
2240         }
2241     }
2242 
2243     /*
2244      * This method notifies any AWTEventListeners that an event
2245      * is about to be dispatched.
2246      *
2247      * @param theEvent the event which will be dispatched.
2248      */
2249     void notifyAWTEventListeners(AWTEvent theEvent) {
2250         // This is a workaround for headless toolkits.  It would be
2251         // better to override this method but it is declared package private.
2252         // "this instanceof" syntax defeats polymorphism.
2253         // --mm, 03/03/00
2254         if (this instanceof HeadlessToolkit) {
2255             ((HeadlessToolkit)this).getUnderlyingToolkit()
2256                 .notifyAWTEventListeners(theEvent);
2257             return;
2258         }
2259 
2260         AWTEventListener eventListener = this.eventListener;
2261         if (eventListener != null) {
2262             eventListener.eventDispatched(theEvent);
2263         }
2264     }
2265 
2266     static private class ToolkitEventMulticaster extends AWTEventMulticaster
2267         implements AWTEventListener {
2268         // Implementation cloned from AWTEventMulticaster.
2269 
2270         ToolkitEventMulticaster(AWTEventListener a, AWTEventListener b) {
2271             super(a, b);
2272         }
2273 
2274         static AWTEventListener add(AWTEventListener a,
2275                                     AWTEventListener b) {
2276             if (a == null)  return b;
2277             if (b == null)  return a;
2278             return new ToolkitEventMulticaster(a, b);
2279         }
2280 
2281         static AWTEventListener remove(AWTEventListener l,
2282                                        AWTEventListener oldl) {
2283             return (AWTEventListener) removeInternal(l, oldl);
2284         }
2285 
2286         // #4178589: must overload remove(EventListener) to call our add()
2287         // instead of the static addInternal() so we allocate a
2288         // ToolkitEventMulticaster instead of an AWTEventMulticaster.
2289         // Note: this method is called by AWTEventListener.removeInternal(),
2290         // so its method signature must match AWTEventListener.remove().
2291         protected EventListener remove(EventListener oldl) {
2292             if (oldl == a)  return b;
2293             if (oldl == b)  return a;
2294             AWTEventListener a2 = (AWTEventListener)removeInternal(a, oldl);
2295             AWTEventListener b2 = (AWTEventListener)removeInternal(b, oldl);
2296             if (a2 == a && b2 == b) {
2297                 return this;    // it's not here
2298             }
2299             return add(a2, b2);
2300         }
2301 
2302         public void eventDispatched(AWTEvent event) {
2303             ((AWTEventListener)a).eventDispatched(event);
2304             ((AWTEventListener)b).eventDispatched(event);
2305         }
2306     }
2307 
2308     private class SelectiveAWTEventListener implements AWTEventListener {
2309         AWTEventListener listener;
2310         private long eventMask;
2311         // This array contains the number of times to call the eventlistener
2312         // for each event type.
2313         int[] calls = new int[Toolkit.LONG_BITS];
2314 
2315         public AWTEventListener getListener() {return listener;}
2316         public long getEventMask() {return eventMask;}
2317         public int[] getCalls() {return calls;}
2318 
2319         public void orEventMasks(long mask) {
2320             eventMask |= mask;
2321             // For each event bit set in mask, increment its call count.
2322             for (int i=0; i<Toolkit.LONG_BITS; i++) {
2323                 // If no bits are set, break out of loop.
2324                 if (mask == 0) {
2325                     break;
2326                 }
2327                 if ((mask & 1L) != 0) {  // Always test bit 0.
2328                     calls[i]++;
2329                 }
2330                 mask >>>= 1;  // Right shift, fill with zeros on left.
2331             }
2332         }
2333 
2334         SelectiveAWTEventListener(AWTEventListener l, long mask) {
2335             listener = l;
2336             eventMask = mask;
2337         }
2338 
2339         public void eventDispatched(AWTEvent event) {
2340             long eventBit = 0; // Used to save the bit of the event type.
2341             if (((eventBit = eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 &&
2342                  event.id >= ComponentEvent.COMPONENT_FIRST &&
2343                  event.id <= ComponentEvent.COMPONENT_LAST)
2344              || ((eventBit = eventMask & AWTEvent.CONTAINER_EVENT_MASK) != 0 &&
2345                  event.id >= ContainerEvent.CONTAINER_FIRST &&
2346                  event.id <= ContainerEvent.CONTAINER_LAST)
2347              || ((eventBit = eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 &&
2348                  event.id >= FocusEvent.FOCUS_FIRST &&
2349                  event.id <= FocusEvent.FOCUS_LAST)
2350              || ((eventBit = eventMask & AWTEvent.KEY_EVENT_MASK) != 0 &&
2351                  event.id >= KeyEvent.KEY_FIRST &&
2352                  event.id <= KeyEvent.KEY_LAST)
2353              || ((eventBit = eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 &&
2354                  event.id == MouseEvent.MOUSE_WHEEL)
2355              || ((eventBit = eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 &&
2356                  (event.id == MouseEvent.MOUSE_MOVED ||
2357                   event.id == MouseEvent.MOUSE_DRAGGED))
2358              || ((eventBit = eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 &&
2359                  event.id != MouseEvent.MOUSE_MOVED &&
2360                  event.id != MouseEvent.MOUSE_DRAGGED &&
2361                  event.id != MouseEvent.MOUSE_WHEEL &&
2362                  event.id >= MouseEvent.MOUSE_FIRST &&
2363                  event.id <= MouseEvent.MOUSE_LAST)
2364              || ((eventBit = eventMask & AWTEvent.WINDOW_EVENT_MASK) != 0 &&
2365                  (event.id >= WindowEvent.WINDOW_FIRST &&
2366                  event.id <= WindowEvent.WINDOW_LAST))
2367              || ((eventBit = eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 &&
2368                  event.id >= ActionEvent.ACTION_FIRST &&
2369                  event.id <= ActionEvent.ACTION_LAST)
2370              || ((eventBit = eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 &&
2371                  event.id >= AdjustmentEvent.ADJUSTMENT_FIRST &&
2372                  event.id <= AdjustmentEvent.ADJUSTMENT_LAST)
2373              || ((eventBit = eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 &&
2374                  event.id >= ItemEvent.ITEM_FIRST &&
2375                  event.id <= ItemEvent.ITEM_LAST)
2376              || ((eventBit = eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 &&
2377                  event.id >= TextEvent.TEXT_FIRST &&
2378                  event.id <= TextEvent.TEXT_LAST)
2379              || ((eventBit = eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 &&
2380                  event.id >= InputMethodEvent.INPUT_METHOD_FIRST &&
2381                  event.id <= InputMethodEvent.INPUT_METHOD_LAST)
2382              || ((eventBit = eventMask & AWTEvent.PAINT_EVENT_MASK) != 0 &&
2383                  event.id >= PaintEvent.PAINT_FIRST &&
2384                  event.id <= PaintEvent.PAINT_LAST)
2385              || ((eventBit = eventMask & AWTEvent.INVOCATION_EVENT_MASK) != 0 &&
2386                  event.id >= InvocationEvent.INVOCATION_FIRST &&
2387                  event.id <= InvocationEvent.INVOCATION_LAST)
2388              || ((eventBit = eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
2389                  event.id == HierarchyEvent.HIERARCHY_CHANGED)
2390              || ((eventBit = eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
2391                  (event.id == HierarchyEvent.ANCESTOR_MOVED ||
2392                   event.id == HierarchyEvent.ANCESTOR_RESIZED))
2393              || ((eventBit = eventMask & AWTEvent.WINDOW_STATE_EVENT_MASK) != 0 &&
2394                  event.id == WindowEvent.WINDOW_STATE_CHANGED)
2395              || ((eventBit = eventMask & AWTEvent.WINDOW_FOCUS_EVENT_MASK) != 0 &&
2396                  (event.id == WindowEvent.WINDOW_GAINED_FOCUS ||
2397                   event.id == WindowEvent.WINDOW_LOST_FOCUS))
2398                 || ((eventBit = eventMask & sun.awt.SunToolkit.GRAB_EVENT_MASK) != 0 &&
2399                     (event instanceof sun.awt.UngrabEvent))) {
2400                 // Get the index of the call count for this event type.
2401                 // Instead of using Math.log(...) we will calculate it with
2402                 // bit shifts. That's what previous implementation looked like:
2403                 //
2404                 // int ci = (int) (Math.log(eventBit)/Math.log(2));
2405                 int ci = 0;
2406                 for (long eMask = eventBit; eMask != 0; eMask >>>= 1, ci++) {
2407                 }
2408                 ci--;
2409                 // Call the listener as many times as it was added for this
2410                 // event type.
2411                 for (int i=0; i<calls[ci]; i++) {
2412                     listener.eventDispatched(event);
2413                 }
2414             }
2415         }
2416     }
2417 
2418     /**
2419      * Returns a map of visual attributes for the abstract level description
2420      * of the given input method highlight, or null if no mapping is found.
2421      * The style field of the input method highlight is ignored. The map
2422      * returned is unmodifiable.
2423      * @param highlight input method highlight
2424      * @return style attribute map, or <code>null</code>
2425      * @exception HeadlessException if
2426      *     <code>GraphicsEnvironment.isHeadless</code> returns true
2427      * @see       java.awt.GraphicsEnvironment#isHeadless
2428      * @since 1.3
2429      */
2430     public abstract Map<java.awt.font.TextAttribute,?>
2431         mapInputMethodHighlight(InputMethodHighlight highlight)
2432         throws HeadlessException;
2433 
2434     private static PropertyChangeSupport createPropertyChangeSupport(Toolkit toolkit) {
2435         if (toolkit instanceof SunToolkit || toolkit instanceof HeadlessToolkit) {
2436             return new DesktopPropertyChangeSupport(toolkit);
2437         } else {
2438             return new PropertyChangeSupport(toolkit);
2439         }
2440     }
2441 
2442     private static class DesktopPropertyChangeSupport extends PropertyChangeSupport {
2443         private static final StringBuilder PROP_CHANGE_SUPPORT_KEY =
2444                 new StringBuilder("desktop property change support key");
2445         private final Object source;
2446 
2447         public DesktopPropertyChangeSupport(Object sourceBean) {
2448             super(sourceBean);
2449             source = sourceBean;
2450         }
2451 
2452         @Override
2453         public synchronized void addPropertyChangeListener(
2454                 String propertyName,
2455                 PropertyChangeListener listener)
2456         {
2457             PropertyChangeSupport pcs = (PropertyChangeSupport)
2458                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2459             if (null == pcs) {
2460                 pcs = new PropertyChangeSupport(source);
2461                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2462             }
2463             pcs.addPropertyChangeListener(propertyName, listener);
2464         }
2465 
2466         @Override
2467         public synchronized void removePropertyChangeListener(
2468                 String propertyName,
2469                 PropertyChangeListener listener)
2470         {
2471             PropertyChangeSupport pcs = (PropertyChangeSupport)
2472                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2473             if (null != pcs) {
2474                 pcs.removePropertyChangeListener(propertyName, listener);
2475             }
2476         }
2477 
2478         @Override
2479         public synchronized PropertyChangeListener[] getPropertyChangeListeners()
2480         {
2481             PropertyChangeSupport pcs = (PropertyChangeSupport)
2482                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2483             if (null != pcs) {
2484                 return pcs.getPropertyChangeListeners();
2485             } else {
2486                 return new PropertyChangeListener[0];
2487             }
2488         }
2489 
2490         @Override
2491         public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
2492         {
2493             PropertyChangeSupport pcs = (PropertyChangeSupport)
2494                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2495             if (null != pcs) {
2496                 return pcs.getPropertyChangeListeners(propertyName);
2497             } else {
2498                 return new PropertyChangeListener[0];
2499             }
2500         }
2501 
2502         @Override
2503         public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
2504             PropertyChangeSupport pcs = (PropertyChangeSupport)
2505                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2506             if (null == pcs) {
2507                 pcs = new PropertyChangeSupport(source);
2508                 AppContext.getAppContext().put(PROP_CHANGE_SUPPORT_KEY, pcs);
2509             }
2510             pcs.addPropertyChangeListener(listener);
2511         }
2512 
2513         @Override
2514         public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
2515             PropertyChangeSupport pcs = (PropertyChangeSupport)
2516                     AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2517             if (null != pcs) {
2518                 pcs.removePropertyChangeListener(listener);
2519             }
2520         }
2521 
2522         /*
2523          * we do expect that all other fireXXX() methods of java.beans.PropertyChangeSupport
2524          * use this method.  If this will be changed we will need to change this class.
2525          */
2526         @Override
2527         public void firePropertyChange(final PropertyChangeEvent evt) {
2528             Object oldValue = evt.getOldValue();
2529             Object newValue = evt.getNewValue();
2530             String propertyName = evt.getPropertyName();
2531             if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
2532                 return;
2533             }
2534             Runnable updater = new Runnable() {
2535                 public void run() {
2536                     PropertyChangeSupport pcs = (PropertyChangeSupport)
2537                             AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
2538                     if (null != pcs) {
2539                         pcs.firePropertyChange(evt);
2540                     }
2541                 }
2542             };
2543             final AppContext currentAppContext = AppContext.getAppContext();
2544             for (AppContext appContext : AppContext.getAppContexts()) {
2545                 if (null == appContext || appContext.isDisposed()) {
2546                     continue;
2547                 }
2548                 if (currentAppContext == appContext) {
2549                     updater.run();
2550                 } else {
2551                     final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
2552                     SunToolkit.postEvent(appContext, e);
2553                 }
2554             }
2555         }
2556     }
2557 
2558     /**
2559     * Reports whether events from extra mouse buttons are allowed to be processed and posted into
2560     * {@code EventQueue}.
2561     * <br>
2562     * To change the returned value it is necessary to set the {@code sun.awt.enableExtraMouseButtons}
2563     * property before the {@code Toolkit} class initialization. This setting could be done on the application
2564     * startup by the following command:
2565     * <pre>
2566     * java -Dsun.awt.enableExtraMouseButtons=false Application
2567     * </pre>
2568     * Alternatively, the property could be set in the application by using the following code:
2569     * <pre>
2570     * System.setProperty("sun.awt.enableExtraMouseButtons", "true");
2571     * </pre>
2572     * before the {@code Toolkit} class initialization.
2573     * If not set by the time of the {@code Toolkit} class initialization, this property will be
2574     * initialized with {@code true}.
2575     * Changing this value after the {@code Toolkit} class initialization will have no effect.
2576     * <p>
2577     * The current value could be queried by using the
2578     * {@code System.getProperty("sun.awt.enableExtraMouseButtons")} method.
2579     * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
2580     * @return {@code true} if events from extra mouse buttons are allowed to be processed and posted;
2581     *         {@code false} otherwise
2582     * @see System#getProperty(String propertyName)
2583     * @see System#setProperty(String propertyName, String value)
2584     * @see java.awt.EventQueue
2585     * @since 1.7
2586      */
2587     public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
2588         return Toolkit.getDefaultToolkit().areExtraMouseButtonsEnabled();
2589     }
2590 }