01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.woody.event.impl;
18:
19: import org.apache.cocoon.woody.event.ActionListener;
20: import org.apache.cocoon.woody.event.ValueChangedListener;
21: import org.apache.cocoon.woody.event.WidgetListener;
22: import org.apache.cocoon.woody.event.WidgetListenerBuilder;
23: import org.apache.cocoon.woody.util.JavaScriptHelper;
24: import org.mozilla.javascript.Script;
25: import org.w3c.dom.Element;
26:
27: /**
28: * Builds a {@link WidgetListener} based on a JavaScript snippet.
29: * <p>
30: * The syntax for this listener is as follows :
31: * <pre>
32: * <javascript>
33: * var widget = event.sourceWidget;
34: * sourceWidget.setValue("Yeah");
35: * </javascript>
36: * </pre>
37: * As shown above, the event that fired this listener is published as the <code>event</code>
38: * variable.
39: *
40: * @author <a href="http://www.apache.org/~sylvain/">Sylvain Wallez</a>
41: * @version CVS $Id: JavaScriptWidgetListenerBuilder.java 433543 2006-08-22 06:22:54Z crossley $
42: */
43: public class JavaScriptWidgetListenerBuilder implements
44: WidgetListenerBuilder {
45:
46: public static final JavaScriptWidgetListenerBuilder INSTANCE = new JavaScriptWidgetListenerBuilder();
47:
48: public WidgetListener buildListener(Element element,
49: Class listenerClass) throws Exception {
50:
51: Script script = JavaScriptHelper.buildScript(element);
52:
53: if (listenerClass == ActionListener.class) {
54: return new JavaScriptWidgetListener.JSActionListener(script);
55: } else if (listenerClass == ValueChangedListener.class) {
56: return new JavaScriptWidgetListener.JSValueChangedListener(
57: script);
58: } else {
59: throw new Exception("Unkonwn event class: " + listenerClass);
60: }
61: }
62: }
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