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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