1 /*
2 * Copyright (c) 2003 Scott Howlett & Paul Libbrecht.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. The end-user documentation included with the redistribution,
18 * if any, must include the following acknowledgment:
19 * "This product includes software developed by the Xwing
20 * Project ( http://xwing.sourceforge.net/ )."
21 * Alternately, this acknowledgment may appear in the software itself,
22 * if and wherever such third-party acknowledgments normally appear.
23 *
24 * 4. The name "Xwing" must not be used to endorse or promote products
25 * derived from this software without prior written permission. For
26 * written permission, please contact the project authors via
27 * the Xwing project site, http://xwing.sourceforge.net/ .
28 *
29 * 5. Products derived from this software may not be called "Xwing",
30 * nor may "Xwing" appear in their name, without prior written
31 * permission of the Xwing project.
32 *
33 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36 * DISCLAIMED. IN NO EVENT SHALL THE XWING AUTHORS OR THE PROJECT
37 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
39 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
40 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
41 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
42 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
43 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44 * SUCH DAMAGE.
45 *
46 * For more information on Xwing, please see
47 * < http://xwing.sourceforge.net/ >.
48 */
49
50 package net.sourceforge.xwing.dom;
51
52 import net.sourceforge.xwing.AbstractSourceSink;
53
54 import org.apache.commons.logging.LogFactory;
55 import org.jaxen.JaxenException;
56 import org.jaxen.dom.DOMXPath;
57 import org.w3c.dom.Node;
58 import org.w3c.dom.events.Event;
59
60 public class NodeSourceSink extends AbstractSourceSink {
61
62 private NodeListener listener;
63 private DOMXPath select;
64
65 public NodeSourceSink() throws Exception {
66 this(null, null);
67 }
68
69 public NodeSourceSink(Node node) throws Exception {
70 this(node, null);
71 }
72
73 public NodeSourceSink(DOMXPath sel) throws Exception {
74 this(null, sel);
75 }
76
77 public NodeSourceSink(Node node, DOMXPath sel) throws Exception {
78 listener = new NodeListener(node) {
79 protected void nodeChanged(Event evt) {
80 fireStateChanged();
81 }
82 };
83
84 select = sel;
85
86 }
87
88 public Object get() {
89 if (select == null) {
90 return listener.getNode();
91 } else {
92 try {
93 return select.selectSingleNode(listener.getNode());
94 } catch (JaxenException exc) {
95 LogFactory.getLog(getClass()).error("Error in get", exc);
96 return null;
97 }
98 }
99 }
100
101 public void set(Object value) {
102 if (select != null) {
103 throw new IllegalStateException(
104 "Cannot set node " + "if select is not null.");
105 }
106
107 listener.setNode((Node) value);
108 }
109 }
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