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
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 */
25package sun.awt.X11;
26
27public 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 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
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}
80