1 /*

     2  * Copyright 2009 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any 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 IgnoreBadWindowHandler theInstance = new IgnoreBadWindowHandler();

    75         public static IgnoreBadWindowHandler getInstance() {

    76             return theInstance;

    77         }

    78     }

    79 }