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 package net.sourceforge.xwing.jelly.tags.xwing;
50
51 import javax.swing.event.ChangeEvent;
52 import javax.swing.event.ChangeListener;
53
54 import net.sourceforge.xwing.SourceSink;
55
56 import org.apache.commons.jelly.JellyContext;
57 import org.apache.commons.jelly.JellyTagException;
58 import org.apache.commons.jelly.MissingAttributeException;
59 import org.apache.commons.jelly.Script;
60 import org.apache.commons.jelly.TagSupport;
61 import org.apache.commons.jelly.XMLOutput;
62 import org.apache.commons.logging.LogFactory;
63
64 public class ChangeListenerTag extends TagSupport {
65
66 private String var;
67 private SourceSink sourceSink;
68 private String eventVar = "event";
69
70 public void setVar(String var) {
71 this.var = var;
72 }
73
74 public void setSourceSink(SourceSink sourceSink) {
75 this.sourceSink = sourceSink;
76 }
77
78 public void setEventVar(String eventVar) {
79 this.eventVar = eventVar;
80 }
81
82 public void doTag(final XMLOutput output)
83 throws MissingAttributeException, JellyTagException {
84
85 if (sourceSink == null) {
86 SourceSinkTag ss =
87 (SourceSinkTag) findAncestorWithClass(SourceSinkTag.class);
88 if (ss == null) {
89 throw new JellyTagException(
90 "Must either specify sourceSink "
91 + "attribute or be contained within "
92 + "an appropriate parent tag.");
93 }
94 sourceSink = ss.getSourceSink();
95 }
96
97 ChangeListener handler =
98 new ContextChangeListener(eventVar, context, getBody());
99
100 sourceSink.addChangeListener(handler);
101
102 if (var != null) {
103 context.setVariable(var, handler);
104 }
105 }
106
107 }
108
109 class ContextChangeListener implements ChangeListener {
110
111 private String eventVar;
112 private JellyContext context;
113 private Script script;
114
115 public ContextChangeListener(
116 String eventVar,
117 JellyContext context,
118 Script script) {
119 this.eventVar = eventVar;
120 this.context = context;
121 this.script = script;
122 }
123
124 public void stateChanged(ChangeEvent e) {
125 try {
126 if (eventVar != null) {
127 context.setVariable(eventVar, e);
128 }
129 script.run(context, XMLOutput.createDummyXMLOutput());
130 if (eventVar != null) {
131 context.removeVariable(eventVar);
132 }
133 } catch (Exception exc) {
134 LogFactory.getLog(getClass()).error("Error in stateChanged", exc);
135 }
136 }
137 }
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