1 /*
   2  * Copyright (c) 2007, 2014, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.awt.*;
  25 import java.awt.datatransfer.DataFlavor;
  26 import java.awt.datatransfer.UnsupportedFlavorException;
  27 import java.awt.event.WindowAdapter;
  28 import java.awt.event.WindowEvent;
  29 import java.awt.dnd.*;
  30 import java.io.IOException;
  31 import java.security.Permission;
  32 import java.security.AccessControlException;
  33 
  34 class DragInterceptorFrame extends Frame implements DropTargetListener {
  35 
  36     private static int exitMessage = InterprocessMessages.TEST_PASSED;
  37     private static boolean dataIsAccessible = false;
  38     private static boolean exceptionHasBeenThrown = false;
  39 
  40     DragInterceptorFrame(Point location) {
  41         System.setSecurityManager(new ClipboardDefender());
  42         initGUI(location);
  43         setDropTarget(new DropTarget(this, DnDConstants.ACTION_COPY,
  44                 this));
  45     }
  46 
  47     private void initGUI(Point location) {
  48         this.setLocation(location);
  49         this.addWindowListener(new WindowAdapter() {
  50             public void windowClosing(WindowEvent e) {
  51                 DragInterceptorFrame.this.dispose();
  52             }
  53         });
  54         setSize (200, 200);
  55         this.setVisible(true);
  56     }
  57 
  58     public void dragEnter(DropTargetDragEvent dtde) {
  59         // We want to set the exception handler on EDT
  60         Thread.currentThread().setUncaughtExceptionHandler (
  61             new Thread.UncaughtExceptionHandler() {
  62                 public void uncaughtException(Thread t, Throwable e) {
  63                     exceptionHasBeenThrown = true;
  64                 }
  65             }
  66         );
  67         examineTransferable(dtde);
  68     }
  69 
  70     public void dragOver(DropTargetDragEvent dtde) {
  71         examineTransferable(dtde);
  72     }
  73 
  74     public void dropActionChanged(DropTargetDragEvent dtde) {
  75         examineTransferable(dtde);
  76     }
  77 
  78     public void dragExit(DropTargetEvent dte) {}
  79 
  80     public void drop(DropTargetDropEvent dtde) {
  81 
  82         if (dataIsAccessible && !exceptionHasBeenThrown) {
  83             exitMessage = InterprocessMessages.DATA_WAS_INTERCEPTED_AND_EXCEPTION_HANDLER_WAS_NOT_TRIGGERED;
  84         } else if (dataIsAccessible) {
  85             exitMessage = InterprocessMessages.DATA_WAS_INTERCEPTED;
  86         } else if (!exceptionHasBeenThrown) {
  87             exitMessage = InterprocessMessages.EXCEPTION_HANDLER_WAS_NOT_TRIGGERED;
  88         }
  89 
  90         System.exit(exitMessage);
  91     }
  92 
  93     Point getDropTargetPoint() {
  94         return new Point((int)getLocationOnScreen().getX()+(getWidth()/2),
  95                 (int)getLocationOnScreen().getY()+(getHeight()/2));
  96     }
  97 
  98     private void examineTransferable(DropTargetDragEvent dtde) {
  99         if (dtde.getCurrentDataFlavorsAsList().contains(DataFlavor.stringFlavor)) {
 100             dtde.acceptDrag(DnDConstants.ACTION_COPY);
 101             try{
 102                 if (null != dtde.getTransferable().getTransferData(DataFlavor.stringFlavor)) {
 103                     dataIsAccessible = true;
 104                 }
 105             } catch (IOException e) {
 106                 e.printStackTrace();
 107                 exitMessage = InterprocessMessages.UNEXPECTED_IO_EXCEPTION;
 108             } catch (UnsupportedFlavorException e) {
 109                 e.printStackTrace();
 110                 exitMessage = InterprocessMessages.UNEXPECTED_UNSUPPORTED_FLAVOR_EXCEPTION;
 111             }
 112         }
 113     }
 114 
 115     static class ClipboardDefender extends SecurityManager {
 116         public void checkPermission(Permission p) {
 117            if (p instanceof java.awt.AWTPermission && 
 118                    p.getName().equals("accessClipboard")) {
 119                throw new AccessControlException("access denied ");
 120            }
 121         }
 122     }
 123 
 124     public static void main(String[] args) {
 125         new DragInterceptorFrame(new Point(200,200));
 126     }
 127 }