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Java example source code file (XErrorHandler.java)

This example Java source code file (XErrorHandler.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

ignorebadwindowhandler, override, verifychangepropertyhandler, xbaseerrorhandler, xerrorevent, xerrorhandler

The XErrorHandler.java Java example source code

/*
 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package sun.awt.X11;

public abstract class XErrorHandler {

    /*
     * Called under AWT lock
     */
    public abstract int handleError(long display, XErrorEvent err);

    /*
     * Forwards all the errors to saved error handler (which was
     * set before XToolkit had been initialized).
     */
    public static class XBaseErrorHandler extends XErrorHandler {
        @Override
        public int handleError(long display, XErrorEvent err) {
            return XErrorHandlerUtil.SAVED_XERROR_HANDLER(display, err);
        }
    }

    /*
     * Instead of validating window id, we simply call XGetWindowProperty,
     * but temporary install this function as the error handler to ignore
     * BadWindow error.
     */
    public static class IgnoreBadWindowHandler extends XBaseErrorHandler {
        @Override
        public int handleError(long display, XErrorEvent err) {
            if (err.get_error_code() == XConstants.BadWindow) {
                return 0;
            }
            return super.handleError(display, err);
        }
        // Shared instance
        private static IgnoreBadWindowHandler theInstance = new IgnoreBadWindowHandler();
        public static IgnoreBadWindowHandler getInstance() {
            return theInstance;
        }
    }

    public static class VerifyChangePropertyHandler extends XBaseErrorHandler {
        @Override
        public int handleError(long display, XErrorEvent err) {
            if (err.get_request_code() == XProtocolConstants.X_ChangeProperty) {
                return 0;
            }
            return super.handleError(display, err);
        }
        // Shared instance
        private static VerifyChangePropertyHandler theInstance = new VerifyChangePropertyHandler();
        public static VerifyChangePropertyHandler getInstance() {
            return theInstance;
        }
    }
}

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