1 /*
   2  * Copyright (c) 2003, 2008, 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 
  26 package sun.awt.X11;
  27 
  28 import sun.util.logging.PlatformLogger;
  29 
  30 import java.util.*;
  31 
  32 class XProtocol {
  33     private final static PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XProtocol");
  34 
  35     private Map<XAtom, XAtomList> atomToList = new HashMap<XAtom, XAtomList>();
  36     private Map<XAtom, Long> atomToAnchor = new HashMap<XAtom, Long>();
  37 
  38     volatile boolean firstCheck = true;
  39     /*
  40      * Check that that the list of protocols specified by WM in property
  41      * named LIST_NAME on the root window contains protocol PROTO.
  42      */
  43     boolean checkProtocol(XAtom listName, XAtom protocol) {
  44         XAtomList protocols = atomToList.get(listName);
  45 
  46         if (protocols != null) {
  47             return protocols.contains(protocol);
  48         }
  49 
  50         protocols = listName.getAtomListPropertyList(XToolkit.getDefaultRootWindow());
  51         atomToList.put(listName, protocols);
  52         try {
  53             return protocols.contains(protocol);
  54         } finally {
  55             if (firstCheck) {
  56                 firstCheck = false;
  57                 if (log.isLoggable(PlatformLogger.Level.FINE)) {
  58                     log.fine("{0}:{1} supports {2}", this, listName, protocols);
  59                 }
  60             }
  61         }
  62     }
  63 
  64     /*
  65      * Check for anchor_prop(anchor_type) on root, take the value as the
  66      * window id and check if that window exists and has anchor_prop(anchor_type)
  67      * with the same value (i.e. pointing back to self).
  68      *
  69      * Returns the anchor window, as some WM may put interesting stuff in
  70      * its properties (e.g. sawfish).
  71      */
  72     long checkAnchorImpl(XAtom anchorProp, long anchorType) {
  73         long root_xref, self_xref;
  74 
  75         XToolkit.awtLock();
  76         try {
  77             root_xref = anchorProp.get32Property(XToolkit.getDefaultRootWindow(),
  78                                                  anchorType);
  79         } finally {
  80             XToolkit.awtUnlock();
  81         }
  82         if (root_xref == 0) {
  83             return 0;
  84         }
  85         self_xref = anchorProp.get32Property(root_xref, anchorType);
  86         if (self_xref != root_xref) {
  87             return 0;
  88         }
  89         return self_xref;
  90     }
  91     public long checkAnchor(XAtom anchorProp, long anchorType) {
  92         Long val = atomToAnchor.get(anchorProp);
  93         if (val != null) {
  94             return val.longValue();
  95         }
  96         long res = checkAnchorImpl(anchorProp, anchorType);
  97         atomToAnchor.put(anchorProp, res);
  98         return res;
  99     }
 100     public long checkAnchor(XAtom anchorProp, XAtom anchorType) {
 101         return checkAnchor(anchorProp, anchorType.getAtom());
 102     }
 103 
 104 }