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1 /* 2 * $Header: /cvsroot/xwing/projects/xwing/src/java/org/apache/commons/jelly/impl/StaticTagScript.java,v 1.1 2003/09/17 00:00:20 jshowlett Exp $ 3 * $Revision: 1.1 $ 4 * $Date: 2003/09/17 00:00:20 $ 5 * 6 * ==================================================================== 7 * 8 * The Apache Software License, Version 1.1 9 * 10 * Copyright (c) 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: StaticTagScript.java,v 1.1 2003/09/17 00:00:20 jshowlett 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.DynaTag; 68 import org.apache.commons.jelly.JellyContext; 69 import org.apache.commons.jelly.JellyException; 70 import org.apache.commons.jelly.JellyTagException; 71 import org.apache.commons.jelly.Tag; 72 import org.apache.commons.jelly.TagLibrary; 73 import org.apache.commons.jelly.XMLOutput; 74 import org.apache.commons.jelly.expression.Expression; 75 import org.xml.sax.SAXException; 76 77 /*** 78 * <p><code>StaticTagScript</code> is a script that evaluates a StaticTag, a piece of static XML 79 * though its attributes or element content may contain dynamic expressions. 80 * The first time this tag evaluates, it may have become a dynamic tag, so it will check that 81 * a new dynamic tag has not been generated.</p> 82 * 83 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 84 * @version $Revision: 1.1 $ 85 */ 86 public class StaticTagScript extends TagScript { 87 88 public StaticTagScript() { 89 } 90 91 public StaticTagScript(TagFactory tagFactory) { 92 super(tagFactory); 93 } 94 95 96 // Script interface 97 //------------------------------------------------------------------------- 98 public void run(JellyContext context, XMLOutput output) throws JellyTagException { 99 try { 100 startNamespacePrefixes(output); 101 } catch (SAXException e) { 102 throw new JellyTagException("could not start namespace prefixes",e); 103 } 104 105 if ( ! context.isCacheTags() ) { 106 clearTag(); 107 } 108 Tag tag = null; 109 try { 110 tag = getTag(); 111 112 // lets see if we have a dynamic tag 113 if (tag instanceof StaticTag) { 114 tag = findDynamicTag(context, (StaticTag) tag); 115 } 116 117 setTag(tag); 118 } catch (JellyException e) { 119 throw new JellyTagException(e); 120 } 121 122 try { 123 if ( tag == null ) { 124 return; 125 } 126 tag.setContext(context); 127 128 DynaTag dynaTag = (DynaTag) tag; 129 130 // ### probably compiling this to 2 arrays might be quicker and smaller 131 for (Iterator iter = attributes.entrySet().iterator(); iter.hasNext();) { 132 Map.Entry entry = (Map.Entry) iter.next(); 133 String name = (String) entry.getKey(); 134 Expression expression = (Expression) entry.getValue(); 135 136 Object value = null; 137 138 if ( Expression.class.isAssignableFrom( dynaTag.getAttributeType(name) ) ) { 139 value = expression; 140 } else { 141 value = expression.evaluate(context); 142 } 143 144 dynaTag.setAttribute(name, value); 145 } 146 147 tag.doTag(output); 148 } 149 catch (JellyTagException e) { 150 handleException(e); 151 } 152 catch (RuntimeException e) { 153 handleException(e); 154 } 155 finally { 156 if ( ! context.isCacheTags() ) { 157 clearTag(); 158 } 159 } 160 161 try { 162 endNamespacePrefixes(output); 163 } catch (SAXException e) { 164 throw new JellyTagException("could not end namespace prefixes",e); 165 } 166 } 167 168 /*** 169 * Attempts to find a dynamically created tag that has been created since this 170 * script was compiled 171 */ 172 protected Tag findDynamicTag(JellyContext context, StaticTag tag) throws JellyException { 173 // lets see if there's a tag library for this URI... 174 TagLibrary taglib = context.getTagLibrary( tag.getUri() ); 175 if ( taglib != null ) { 176 Tag newTag = taglib.createTag( tag.getLocalName(), getSaxAttributes() ); 177 if ( newTag != null ) { 178 newTag.setParent( tag.getParent() ); 179 newTag.setBody( tag.getBody() ); 180 return newTag; 181 } 182 } 183 return tag; 184 } 185 }

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