1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/MapTagSupport.java,v 1.3 2002/05/17 15:18:12 jstrachan Exp $
3 * $Revision: 1.3 $
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: MapTagSupport.java,v 1.3 2002/05/17 15:18:12 jstrachan Exp $
61 */
62
63 package org.apache.commons.jelly;
64
65 import java.util.HashMap;
66
67 import java.util.Map;
68
69 /***
70 * <p><code>MapTag</code> is a DynaTag implementation which uses a Map
71 * to store its attribute values in. Derived tags can then process this
72 * Map, change values, add or remove attributes or perform some other form
73 * of processsing pretty easily.
74 * </p>
75 *
76 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
77 * @version $Revision: 1.3 $
78 */
79
80 public abstract class MapTagSupport extends TagSupport implements DynaTag {
81
82 private Map map;
83
84 /*** Sets an attribute value of this tag before the tag is invoked
85 */
86 public void setAttribute(String name, Object value) {
87 getAttributes().put(name, value);
88 }
89
90 /***
91 * Helper method which allows derived tags to access the attributes
92 * associated with this tag
93 */
94 protected Map getAttributes() {
95 if (map == null) {
96 map = createAttributes();
97 }
98 return map;
99 }
100 /***
101 * A Factory Method which allows derived tags to overload the Map
102 * implementation used by this tag
103 */
104
105 protected Map createAttributes() {
106 return new HashMap();
107 }
108
109 }
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