1 /*
   2   @test
   3   @bug 4980592
   4   @summary switching user in XP causes an NPE in sun.awt.windows.WWindowPeer.displayChanged
   5   @author son@sparc.spb.su: area=embedded
   6   @modules java.desktop/java.awt.peer
   7            java.desktop/sun.awt
   8   @run main DisplayChangedTest
   9 */
  10 
  11 /**
  12  * DisplayChangedTest.java
  13  *
  14  * summary: switching user in XP causes an NPE in sun.awt.windows.WWindowPeer.displayChanged
  15  */
  16 
  17 import java.awt.Frame;
  18 import java.awt.Dialog;
  19 import java.awt.TextArea;
  20 import java.awt.peer.ComponentPeer;
  21 import java.awt.peer.FramePeer;
  22 
  23 import java.lang.reflect.Constructor;
  24 import java.lang.reflect.Method;
  25 import java.lang.reflect.Field;
  26 
  27 import sun.awt.AWTAccessor;
  28 
  29 public class DisplayChangedTest
  30 {
  31     private static void init()
  32     {
  33         //*** Create instructions for the user here ***
  34 
  35         String[] instructions =
  36         {
  37             "This is an AUTOMATIC test, simply wait until it is done.",
  38             "The result (passed or failed) will be shown in the",
  39             "message window below."
  40         };
  41         Sysout.createDialog( );
  42         Sysout.printInstructions( instructions );
  43 
  44         if (!System.getProperty("os.name").startsWith("Windows")) {
  45             System.out.println("This is Windows only test.");
  46             DisplayChangedTest.pass();
  47             return;
  48         }
  49 
  50         try {
  51             Frame frame = new Frame("AWT Frame");
  52             frame.pack();
  53 
  54             FramePeer frame_peer = AWTAccessor.getComponentAccessor().getPeer(frame);
  55             Sysout.println("frame's peer = " + frame_peer);
  56             Class comp_peer_class =
  57                 Class.forName("sun.awt.windows.WComponentPeer");
  58             Sysout.println("comp peer class = " + comp_peer_class);
  59             Field hwnd_field = comp_peer_class.getDeclaredField("hwnd");
  60             hwnd_field.setAccessible(true);
  61             Sysout.println("hwnd_field =" + hwnd_field);
  62             long hwnd = hwnd_field.getLong(frame_peer);
  63             Sysout.println("hwnd = " + hwnd);
  64 
  65             Class clazz = Class.forName("sun.awt.windows.WEmbeddedFrame");
  66             Constructor constructor = clazz.getConstructor (new Class [] {long.class});
  67             Frame embedded_frame =
  68                 (Frame) constructor.newInstance (new Object[] {new Long(hwnd)});;
  69             Sysout.println("embedded_frame = " + embedded_frame);
  70             frame.setVisible(true);
  71 
  72             ComponentPeer peer = AWTAccessor.getComponentAccessor().getPeer(embedded_frame);
  73             Sysout.println("peer = " + peer);
  74             Class peerClass = peer.getClass();
  75             Sysout.println("peer's class = " + peerClass);
  76 
  77             Method displayChangedM =
  78                 peerClass.getMethod("displayChanged", new Class[0]);
  79             displayChangedM.invoke(peer, null);
  80             embedded_frame.dispose();
  81             frame.dispose();
  82         } catch (Throwable thr) {
  83             thr.printStackTrace();
  84             DisplayChangedTest.fail("TEST FAILED: " + thr);
  85         }
  86         DisplayChangedTest.pass();
  87 
  88     }//End  init()
  89 
  90 
  91 
  92     /*****************************************************
  93      * Standard Test Machinery Section
  94      * DO NOT modify anything in this section -- it's a
  95      * standard chunk of code which has all of the
  96      * synchronisation necessary for the test harness.
  97      * By keeping it the same in all tests, it is easier
  98      * to read and understand someone else's test, as
  99      * well as insuring that all tests behave correctly
 100      * with the test harness.
 101      * There is a section following this for test-
 102      * classes
 103      ******************************************************/
 104     private static boolean theTestPassed = false;
 105     private static boolean testGeneratedInterrupt = false;
 106     private static String failureMessage = "";
 107 
 108     private static Thread mainThread = null;
 109 
 110     private static int sleepTime = 300000;
 111 
 112     // Not sure about what happens if multiple of this test are
 113     //  instantiated in the same VM.  Being static (and using
 114     //  static vars), it aint gonna work.  Not worrying about
 115     //  it for now.
 116     public static void main( String args[] ) throws InterruptedException
 117     {
 118         mainThread = Thread.currentThread();
 119         try
 120         {
 121             init();
 122         }
 123         catch( TestPassedException e )
 124         {
 125             //The test passed, so just return from main and harness will
 126             // interepret this return as a pass
 127             return;
 128         }
 129         //At this point, neither test pass nor test fail has been
 130         // called -- either would have thrown an exception and ended the
 131         // test, so we know we have multiple threads.
 132 
 133         //Test involves other threads, so sleep and wait for them to
 134         // called pass() or fail()
 135         try
 136         {
 137             Thread.sleep( sleepTime );
 138             //Timed out, so fail the test
 139             throw new RuntimeException( "Timed out after " + sleepTime/1000 + " seconds" );
 140         }
 141         catch (InterruptedException e)
 142         {
 143             //The test harness may have interrupted the test.  If so, rethrow the exception
 144             // so that the harness gets it and deals with it.
 145             if( ! testGeneratedInterrupt ) throw e;
 146 
 147             //reset flag in case hit this code more than once for some reason (just safety)
 148             testGeneratedInterrupt = false;
 149 
 150             if ( theTestPassed == false )
 151             {
 152                 throw new RuntimeException( failureMessage );
 153             }
 154         }
 155 
 156     }//main
 157 
 158     public static synchronized void setTimeoutTo( int seconds )
 159     {
 160         sleepTime = seconds * 1000;
 161     }
 162 
 163     public static synchronized void pass()
 164     {
 165         Sysout.println( "The test passed." );
 166         Sysout.println( "The test is over, hit  Ctl-C to stop Java VM" );
 167         //first check if this is executing in main thread
 168         if ( mainThread == Thread.currentThread() )
 169         {
 170             //Still in the main thread, so set the flag just for kicks,
 171             // and throw a test passed exception which will be caught
 172             // and end the test.
 173             theTestPassed = true;
 174             throw new TestPassedException();
 175         }
 176         theTestPassed = true;
 177         testGeneratedInterrupt = true;
 178         mainThread.interrupt();
 179     }//pass()
 180 
 181     public static synchronized void fail()
 182     {
 183         //test writer didn't specify why test failed, so give generic
 184         fail( "it just plain failed! :-)" );
 185     }
 186 
 187     public static synchronized void fail( String whyFailed )
 188     {
 189         Sysout.println( "The test failed: " + whyFailed );
 190         Sysout.println( "The test is over, hit  Ctl-C to stop Java VM" );
 191         //check if this called from main thread
 192         if ( mainThread == Thread.currentThread() )
 193         {
 194             //If main thread, fail now 'cause not sleeping
 195             throw new RuntimeException( whyFailed );
 196         }
 197         theTestPassed = false;
 198         testGeneratedInterrupt = true;
 199         failureMessage = whyFailed;
 200         mainThread.interrupt();
 201     }//fail()
 202 
 203 }// class DisplayChangedTest
 204 
 205 //This exception is used to exit from any level of call nesting
 206 // when it's determined that the test has passed, and immediately
 207 // end the test.
 208 class TestPassedException extends RuntimeException
 209 {
 210 }
 211 
 212 //*********** End Standard Test Machinery Section **********
 213 
 214 
 215 //************ Begin classes defined for the test ****************
 216 
 217 // if want to make listeners, here is the recommended place for them, then instantiate
 218 //  them in init()
 219 
 220 /* Example of a class which may be written as part of a test
 221 class NewClass implements anInterface
 222  {
 223    static int newVar = 0;
 224 
 225    public void eventDispatched(AWTEvent e)
 226     {
 227       //Counting events to see if we get enough
 228       eventCount++;
 229 
 230       if( eventCount == 20 )
 231        {
 232          //got enough events, so pass
 233 
 234          DisplayChangedTest.pass();
 235        }
 236       else if( tries == 20 )
 237        {
 238          //tried too many times without getting enough events so fail
 239 
 240          DisplayChangedTest.fail();
 241        }
 242 
 243     }// eventDispatched()
 244 
 245  }// NewClass class
 246 
 247 */
 248 
 249 
 250 //************** End classes defined for the test *******************
 251 
 252 
 253 
 254 
 255 /****************************************************
 256  Standard Test Machinery
 257  DO NOT modify anything below -- it's a standard
 258   chunk of code whose purpose is to make user
 259   interaction uniform, and thereby make it simpler
 260   to read and understand someone else's test.
 261  ****************************************************/
 262 
 263 /**
 264  This is part of the standard test machinery.
 265  It creates a dialog (with the instructions), and is the interface
 266   for sending text messages to the user.
 267  To print the instructions, send an array of strings to Sysout.createDialog
 268   WithInstructions method.  Put one line of instructions per array entry.
 269  To display a message for the tester to see, simply call Sysout.println
 270   with the string to be displayed.
 271  This mimics System.out.println but works within the test harness as well
 272   as standalone.
 273  */
 274 
 275 class Sysout
 276 {
 277     private static TestDialog dialog;
 278 
 279     public static void createDialogWithInstructions( String[] instructions )
 280     {
 281         dialog = new TestDialog( new Frame(), "Instructions" );
 282         dialog.printInstructions( instructions );
 283         dialog.setVisible(true);
 284         println( "Any messages for the tester will display here." );
 285     }
 286 
 287     public static void createDialog( )
 288     {
 289         dialog = new TestDialog( new Frame(), "Instructions" );
 290         String[] defInstr = { "Instructions will appear here. ", "" } ;
 291         dialog.printInstructions( defInstr );
 292         dialog.setVisible(true);
 293         println( "Any messages for the tester will display here." );
 294     }
 295 
 296 
 297     public static void printInstructions( String[] instructions )
 298     {
 299         dialog.printInstructions( instructions );
 300     }
 301 
 302 
 303     public static void println( String messageIn )
 304     {
 305         dialog.displayMessage( messageIn );
 306         System.out.println(messageIn);
 307     }
 308 
 309 }// Sysout  class
 310 
 311 /**
 312   This is part of the standard test machinery.  It provides a place for the
 313    test instructions to be displayed, and a place for interactive messages
 314    to the user to be displayed.
 315   To have the test instructions displayed, see Sysout.
 316   To have a message to the user be displayed, see Sysout.
 317   Do not call anything in this dialog directly.
 318   */
 319 class TestDialog extends Dialog
 320 {
 321 
 322     TextArea instructionsText;
 323     TextArea messageText;
 324     int maxStringLength = 80;
 325 
 326     //DO NOT call this directly, go through Sysout
 327     public TestDialog( Frame frame, String name )
 328     {
 329         super( frame, name );
 330         int scrollBoth = TextArea.SCROLLBARS_BOTH;
 331         instructionsText = new TextArea( "", 15, maxStringLength, scrollBoth );
 332         add( "North", instructionsText );
 333 
 334         messageText = new TextArea( "", 5, maxStringLength, scrollBoth );
 335         add("Center", messageText);
 336 
 337         pack();
 338 
 339         setVisible(true);
 340     }// TestDialog()
 341 
 342     //DO NOT call this directly, go through Sysout
 343     public void printInstructions( String[] instructions )
 344     {
 345         //Clear out any current instructions
 346         instructionsText.setText( "" );
 347 
 348         //Go down array of instruction strings
 349 
 350         String printStr, remainingStr;
 351         for( int i=0; i < instructions.length; i++ )
 352         {
 353             //chop up each into pieces maxSringLength long
 354             remainingStr = instructions[ i ];
 355             while( remainingStr.length() > 0 )
 356             {
 357                 //if longer than max then chop off first max chars to print
 358                 if( remainingStr.length() >= maxStringLength )
 359                 {
 360                     //Try to chop on a word boundary
 361                     int posOfSpace = remainingStr.
 362                         lastIndexOf( ' ', maxStringLength - 1 );
 363 
 364                     if( posOfSpace <= 0 ) posOfSpace = maxStringLength - 1;
 365 
 366                     printStr = remainingStr.substring( 0, posOfSpace + 1 );
 367                     remainingStr = remainingStr.substring( posOfSpace + 1 );
 368                 }
 369                 //else just print
 370                 else
 371                 {
 372                     printStr = remainingStr;
 373                     remainingStr = "";
 374                 }
 375 
 376                 instructionsText.append( printStr + "\n" );
 377 
 378             }// while
 379 
 380         }// for
 381 
 382     }//printInstructions()
 383 
 384     //DO NOT call this directly, go through Sysout
 385     public void displayMessage( String messageIn )
 386     {
 387         messageText.append( messageIn + "\n" );
 388         System.out.println(messageIn);
 389     }
 390 
 391 }// TestDialog  class