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Java > Open Source Codes > org > apache > commons > jelly > MapTagSupport


1 /*
2  * Copyright 2002,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.apache.commons.jelly;
18
19 import java.util.HashMap JavaDoc;
20
21 import java.util.Map JavaDoc;
22
23 /**
24  * <p><code>MapTag</code> is a DynaTag implementation which uses a Map
25  * to store its attribute values in. Derived tags can then process this
26  * Map, change values, add or remove attributes or perform some other form
27  * of processsing pretty easily.
28  * </p>
29  *
30  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
31  * @version $Revision: 155420 $
32  */
33
34 public abstract class MapTagSupport extends DynaTagSupport {
35
36     private Map JavaDoc map;
37
38     /** Sets an attribute value of this tag before the tag is invoked
39      */
40     public void setAttribute(String JavaDoc name, Object JavaDoc value) {
41         getAttributes().put(name, value);
42     }
43
44     /**
45      * Helper method which allows derived tags to access the attributes
46      * associated with this tag
47      */
48     protected Map JavaDoc getAttributes() {
49         if (map == null) {
50             map = createAttributes();
51         }
52         return map;
53     }
54     /**
55      * A Factory Method which allows derived tags to overload the Map
56      * implementation used by this tag
57      */
58
59     protected Map JavaDoc createAttributes() {
60         return new HashMap JavaDoc();
61     }
62
63 }
64
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