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.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 }
--- EOF ---