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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