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.dom;
50
51 import org.apache.commons.jelly.JellyContext;
52 import org.apache.commons.jelly.JellyTagException;
53 import org.apache.commons.jelly.MissingAttributeException;
54 import org.apache.commons.jelly.Script;
55 import org.apache.commons.jelly.TagSupport;
56 import org.apache.commons.jelly.XMLOutput;
57 import org.apache.commons.logging.LogFactory;
58 import org.w3c.dom.Node;
59 import org.w3c.dom.events.Event;
60 import org.w3c.dom.events.EventListener;
61 import org.w3c.dom.events.EventTarget;
62
63 public class EventListenerTag extends TagSupport {
64
65 private String var;
66 private Node node;
67 private String type;
68 private String eventVar = "event";
69
70 public void setVar(String var) {
71 this.var = var;
72 }
73
74 public void setNode(Node node) {
75 this.node = node;
76 }
77
78 public void setType(String type) {
79 this.type = type;
80 }
81
82 public void setEventVar(String eventVar) {
83 this.eventVar = eventVar;
84 }
85
86 public void doTag(final XMLOutput output)
87 throws MissingAttributeException, JellyTagException {
88
89 if (node == null) {
90 throw new MissingAttributeException("node");
91 }
92
93 if (type == null) {
94 throw new MissingAttributeException("type");
95 }
96
97 EventListener handler =
98 new ContextEventListener(eventVar, context, getBody());
99
100 EventTarget tgt = (EventTarget) node;
101 tgt.addEventListener(type, handler, false);
102
103 if (var != null) {
104 context.setVariable(var, handler);
105 }
106 }
107
108 }
109
110 class ContextEventListener implements EventListener {
111
112 private String eventVar;
113 private JellyContext context;
114 private Script script;
115
116 ContextEventListener(
117 String eventVar,
118 JellyContext context,
119 Script script) {
120 this.eventVar = eventVar;
121 this.context = context;
122 this.script = script;
123 }
124
125 public void handleEvent(Event evt) {
126 try {
127 if (eventVar != null) {
128 context.setVariable(eventVar, evt);
129 }
130 script.run(context, XMLOutput.createDummyXMLOutput());
131 if (eventVar != null) {
132 context.removeVariable(eventVar);
133 }
134 } catch (Exception exc) {
135 LogFactory.getLog(getClass()).error("Error in handleEvent", exc);
136 }
137 }
138 }
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