1 /*
   2  * Copyright (c) 1997, 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 /**
  27  * An EventQueue subclass which adds selective tracing of events as they
  28  * are posted to an EventQueue.  Tracing is globally enabled and disabled
  29  * by the AWT.TraceEventPosting property in awt.properties.  <P>
  30  *
  31  * The optional AWT.NoTraceIDs property defines a list of AWTEvent IDs
  32  * which should not be traced, such as MouseEvent.MOUSE_MOVED or PaintEvents.
  33  * This list is declared by specifying the decimal value of each event's ID,
  34  * separated by commas.
  35  *
  36  * @author  Thomas Ball
  37  */
  38 
  39 package sun.awt;
  40 
  41 import java.awt.EventQueue;
  42 import java.awt.AWTEvent;
  43 import java.awt.Toolkit;
  44 import java.util.StringTokenizer;
  45 
  46 public class TracedEventQueue extends EventQueue {
  47 
  48     // Determines whether any event tracing is enabled.
  49     static boolean trace = false;
  50 
  51     // The list of event IDs to ignore when tracing.
  52     static int suppressedIDs[] = null;
  53 
  54     static {
  55         String s = Toolkit.getProperty("AWT.IgnoreEventIDs", "");
  56         if (s.length() > 0) {
  57             StringTokenizer st = new StringTokenizer(s, ",");
  58             int nIDs = st.countTokens();
  59             suppressedIDs = new int[nIDs];
  60             for (int i = 0; i < nIDs; i++) {
  61                 String idString = st.nextToken();
  62                 try {
  63                     suppressedIDs[i] = Integer.parseInt(idString);
  64                 } catch (NumberFormatException e) {
  65                     System.err.println("Bad ID listed in AWT.IgnoreEventIDs " +
  66                                        "in awt.properties: \"" +
  67                                        idString + "\" -- skipped");
  68                     suppressedIDs[i] = 0;
  69                 }
  70             }
  71         } else {
  72             suppressedIDs = new int[0];
  73         }
  74     }
  75 
  76     public void postEvent(AWTEvent theEvent) {
  77         boolean printEvent = true;
  78         int id = theEvent.getID();
  79         for (int i = 0; i < suppressedIDs.length; i++) {
  80             if (id == suppressedIDs[i]) {
  81                 printEvent = false;
  82                 break;
  83             }
  84         }
  85         if (printEvent) {
  86             System.out.println(Thread.currentThread().getName() +
  87                                ": " + theEvent);
  88         }
  89         super.postEvent(theEvent);
  90     }
  91 }