1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/DynamicTag.java,v 1.7 2002/05/17 15:18:12 jstrachan Exp $
3 * $Revision: 1.7 $
4 * $Date: 2002/05/17 15:18:12 $
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 1.7 2002/05/17 15:18:12 jstrachan Exp $
61 */
62 package org.apache.commons.jelly.tags.define;
63
64 import org.apache.commons.jelly.JellyException;
65 import org.apache.commons.jelly.TagSupport;
66 import org.apache.commons.jelly.XMLOutput;
67 import org.apache.commons.jelly.expression.Expression;
68 import org.apache.commons.jelly.impl.Attribute;
69
70 import org.apache.commons.logging.Log;
71 import org.apache.commons.logging.LogFactory;
72
73 /***
74 * This tag is bound onto a Java Bean class. When the tag is invoked a bean will be created
75 * using the tags attributes.
76 * The bean may also have an invoke method called invoke(), run(), execute() or some such method
77 * which will be invoked after the bean has been configured.</p>
78 *
79 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
80 * @author <a href="mailto:jason@zenplex.com">Jason van Zyl</a>
81 * @version $Revision: 1.7 $
82 */
83 public class AttributeTag extends TagSupport {
84
85 /*** The Log to which logging calls will be made. */
86 private static final Log log = LogFactory.getLog(AttributeTag.class);
87
88 /*** the attribute definition */
89 private Attribute attribute;
90
91 public AttributeTag() {
92 attribute = new Attribute();
93 }
94
95 public AttributeTag(Attribute attribute) {
96 this.attribute = attribute;
97 }
98
99 // Tag interface
100 //-------------------------------------------------------------------------
101 public void doTag(XMLOutput output) throws Exception {
102 BeanTag tag = (BeanTag) findAncestorWithClass( BeanTag.class );
103 if ( tag == null ) {
104 throw new JellyException( "This tag should be nested inside a <define:bean> or <define:jellybean> tag" );
105 }
106
107 tag.addAttribute( attribute );
108 }
109
110 // Properties
111 //-------------------------------------------------------------------------
112
113 /***
114 * Sets the name of the attribute
115 */
116 public void setName(String name) {
117 attribute.setName(name);
118 }
119
120 /***
121 * Sets whether this attribute is mandatory or not
122 */
123 public void setRequired(boolean required) {
124 attribute.setRequired(required);
125 }
126
127 /***
128 * Sets the default value of this attribute
129 */
130 public void setDefaultValue(Expression defaultValue) {
131 attribute.setDefaultValue(defaultValue);
132 }
133 }
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