1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/DynamicTag.java,v 1.10 2002/07/10 21:46:18 jvanzyl Exp $
3 * $Revision: 1.10 $
4 * $Date: 2002/07/10 21:46:18 $
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: DynamicTag.java,v 1.10 2002/07/10 21:46:18 jvanzyl Exp $
61 */
62 package org.apache.commons.jelly.impl;
63
64 import java.util.HashMap;
65 import java.util.Map;
66
67 import org.apache.commons.jelly.JellyContext;
68 import org.apache.commons.jelly.DynaTag;
69 import org.apache.commons.jelly.Script;
70 import org.apache.commons.jelly.TagSupport;
71 import org.apache.commons.jelly.XMLOutput;
72
73 import org.apache.commons.logging.Log;
74 import org.apache.commons.logging.LogFactory;
75
76 /***
77 * <p><code>DynamicTag</code> is a tag that is created from
78 * inside a Jelly script as a Jelly template and will invoke a
79 * given script, passing in its instantiation attributes
80 * as variables and will allow the template to invoke its instance body.</p>
81 *
82 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
83 * @version $Revision: 1.10 $
84 */
85 public class DynamicTag extends TagSupport implements DynaTag {
86
87 /*** The Log to which logging calls will be made. */
88 private static final Log log = LogFactory.getLog(DynamicTag.class);
89
90 /*** The template script */
91 private Script template;
92
93 /*** The instance attributes */
94 private Map attributes = new HashMap();
95
96 public DynamicTag() {
97 }
98
99 public DynamicTag(Script template) {
100 this.template = template;
101 }
102
103
104 // Tag interface
105 //-------------------------------------------------------------------------
106 public void doTag(XMLOutput output) throws Exception {
107 if ( log.isDebugEnabled() ) {
108 log.debug("Invoking dynamic tag with attributes: " + attributes);
109 }
110 attributes.put("org.apache.commons.jelly.body", getBody());
111
112 // create new context based on current attributes
113 JellyContext newJellyContext = context.newJellyContext(attributes);
114 getTemplate().run(newJellyContext, output);
115 }
116
117 // DynaTag interface
118 //-------------------------------------------------------------------------
119 public void setAttribute(String name, Object value) {
120 attributes.put(name, value);
121 }
122
123 // Properties
124 //-------------------------------------------------------------------------
125 /*** The template to be executed by this tag which may well
126 * invoke this instances body from inside the template
127 */
128 public Script getTemplate() {
129 return template;
130 }
131
132 public void setTemplate(Script template) {
133 this.template = template;
134 }
135 }
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