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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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