1 /*
2  * Copyright (c) 2009, 2013, 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
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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.
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24  */
25 package sun.awt.X11;
26 
27 public abstract class XErrorHandler {
28 
29     /*
30      * Called under AWT lock
31      */
handleError(long display, XErrorEvent err)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
handleError(long display, XErrorEvent err)40         public int handleError(long display, XErrorEvent err) {
41             return XErrorHandlerUtil.SAVED_XERROR_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
handleError(long display, XErrorEvent err)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();
getInstance()60         public static IgnoreBadWindowHandler getInstance() {
61             return theInstance;
62         }
63     }
64 
65     public static class VerifyChangePropertyHandler extends XBaseErrorHandler {
66         @Override
handleError(long display, XErrorEvent err)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();
getInstance()75         public static VerifyChangePropertyHandler getInstance() {
76             return theInstance;
77         }
78     }
79 }
80