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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/impl/DynaTagScript.java,v 1.8 2002/06/25 17:10:07 jstrachan Exp $ 3 * $Revision: 1.8 $ 4 * $Date: 2002/06/25 17:10:07 $ 5 * 6 * ==================================================================== 7 * 8 * The Apache Software License, Version 1.1 9 * 10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights 11 * reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in 22 * the documentation and/or other materials provided with the 23 * distribution. 24 * 25 * 3. The end-user documentation included with the redistribution, if 26 * any, must include the following acknowlegement: 27 * "This product includes software developed by the 28 * Apache Software Foundation (http://www.apache.org/)." 29 * Alternately, this acknowlegement may appear in the software itself, 30 * if and wherever such third-party acknowlegements normally appear. 31 * 32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software 33 * Foundation" must not be used to endorse or promote products derived 34 * from this software without prior written permission. For written 35 * permission, please contact apache@apache.org. 36 * 37 * 5. Products derived from this software may not be called "Apache" 38 * nor may "Apache" appear in their names without prior written 39 * permission of the Apache Group. 40 * 41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * ==================================================================== 54 * 55 * This software consists of voluntary contributions made by many 56 * individuals on behalf of the Apache Software Foundation. For more 57 * information on the Apache Software Foundation, please see 58 * <http://www.apache.org/>;. 59 * 60 * $Id: DynaTagScript.java,v 1.8 2002/06/25 17:10:07 jstrachan Exp $ 61 */ 62 package org.apache.commons.jelly.impl; 63 64 import java.util.Iterator; 65 import java.util.Map; 66 67 import org.apache.commons.jelly.CompilableTag; 68 import org.apache.commons.jelly.JellyContext; 69 import org.apache.commons.jelly.JellyException; 70 import org.apache.commons.jelly.Script; 71 import org.apache.commons.jelly.Tag; 72 import org.apache.commons.jelly.DynaTag; 73 import org.apache.commons.jelly.DynaBeanTagSupport; 74 import org.apache.commons.jelly.TagLibrary; 75 import org.apache.commons.jelly.XMLOutput; 76 import org.apache.commons.jelly.expression.Expression; 77 78 import org.apache.commons.logging.Log; 79 import org.apache.commons.logging.LogFactory; 80 81 /*** 82 * <p><code>StaticTagScript</code> is a script that evaluates a StaticTag, a piece of static XML 83 * though its attributes or element content may contain dynamic expressions. 84 * The first time this tag evaluates, it may have become a dynamic tag, so it will check that 85 * a new dynamic tag has not been generated.</p> 86 * 87 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 88 * @version $Revision: 1.8 $ 89 */ 90 public class StaticTagScript extends DynaTagScript { 91 92 /*** The Log to which logging calls will be made. */ 93 private static final Log log = LogFactory.getLog(StaticTagScript.class); 94 95 public StaticTagScript() { 96 } 97 98 public StaticTagScript(TagFactory tagFactory) { 99 super(tagFactory); 100 } 101 102 103 // Script interface 104 //------------------------------------------------------------------------- 105 /*** Evaluates the body of a tag */ 106 public void run(JellyContext context, XMLOutput output) throws Exception { 107 108 startNamespacePrefixes(output); 109 110 Tag tag = getTag(); 111 112 // lets see if we have a dynamic tag 113 tag = findDynamicTag(context, (StaticTag) tag); 114 setTag(tag); 115 116 try { 117 if ( tag == null ) { 118 return; 119 } 120 tag.setContext(context); 121 122 DynaTag dynaTag = (DynaTag) tag; 123 124 // ### probably compiling this to 2 arrays might be quicker and smaller 125 for (Iterator iter = attributes.entrySet().iterator(); iter.hasNext();) { 126 Map.Entry entry = (Map.Entry) iter.next(); 127 String name = (String) entry.getKey(); 128 Expression expression = (Expression) entry.getValue(); 129 130 Object value = expression.evaluate(context); 131 dynaTag.setAttribute(name, value); 132 } 133 134 tag.doTag(output); 135 } 136 catch (JellyException e) { 137 handleException(e); 138 } 139 catch (Exception e) { 140 handleException(e); 141 } 142 143 endNamespacePrefixes(output); 144 } 145 146 /*** 147 * Attempts to find a dynamically created tag that has been created since this 148 * script was compiled 149 */ 150 protected Tag findDynamicTag(JellyContext context, StaticTag tag) throws Exception { 151 // lets see if there's a tag library for this URI... 152 TagLibrary taglib = context.getTagLibrary( tag.getUri() ); 153 if ( taglib instanceof DynamicTagLibrary ) { 154 DynamicTagLibrary dynaLib = (DynamicTagLibrary) taglib; 155 Tag newTag = dynaLib.createTag( tag.getLocalName() ); 156 if ( newTag != null ) { 157 newTag.setParent( tag.getParent() ); 158 newTag.setBody( tag.getBody() ); 159 return newTag; 160 } 161 } 162 return tag; 163 } 164 }

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