1 /*
   2  * Copyright (c) 2009, 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 package sun.awt.X11;
  26 
  27 public abstract class XErrorHandler {
  28 
  29     /*
  30      * Called under AWT lock
  31      */
  32     public abstract int handleError(long display, XErrorEvent err);
  33 
  34     /*
  35      * Forwards all the errors to saved error handler (which was
  36      * set before XToolkit had been initialized).
  37      */
  38     public static class XBaseErrorHandler extends XErrorHandler {
  39         @Override
  40         public int handleError(long display, XErrorEvent err) {
  41             return XToolkit.SAVED_ERROR_HANDLER(display, err);
  42         }
  43     }
  44 
  45     /*
  46      * Instead of validating window id, we simply call XGetWindowProperty,
  47      * but temporary install this function as the error handler to ignore
  48      * BadWindow error.
  49      */
  50     public static class IgnoreBadWindowHandler extends XBaseErrorHandler {
  51         @Override
  52         public int handleError(long display, XErrorEvent err) {
  53             if (err.get_error_code() == XConstants.BadWindow) {
  54                 return 0;
  55             }
  56             return super.handleError(display, err);
  57         }
  58         // Shared instance
  59         private static IgnoreBadWindowHandler theInstance = new IgnoreBadWindowHandler();
  60         public static IgnoreBadWindowHandler getInstance() {
  61             return theInstance;
  62         }
  63     }
  64 
  65     public static class VerifyChangePropertyHandler extends XBaseErrorHandler {
  66         @Override
  67         public int handleError(long display, XErrorEvent err) {
  68             if (err.get_request_code() == XProtocolConstants.X_ChangeProperty) {
  69                 return 0;
  70             }
  71             return super.handleError(display, err);
  72         }
  73         // Shared instance
  74         private static VerifyChangePropertyHandler theInstance = new VerifyChangePropertyHandler();
  75         public static VerifyChangePropertyHandler getInstance() {
  76             return theInstance;
  77         }
  78     }
  79 }