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


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 org.apache.commons.beanutils.DynaBean;
20 import org.apache.commons.beanutils.DynaProperty;
21
22 /**
23  * <p><code>DynaBeanTag</code> is a DynaTag implementation which uses a DynaBean
24  * to store its attribute values in. Derived tags can then process this
25  * DynaBean in any way it wishes.
26  * </p>
27  *
28  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
29  * @version $Revision: 155420 $
30  */
31
32 public abstract class DynaBeanTagSupport extends DynaTagSupport {
33
34     /** the DynaBean which is used to store the attributes of this tag. */
35     private DynaBean dynaBean;
36
37     public DynaBeanTagSupport() {
38     }
39     
40     public DynaBeanTagSupport(DynaBean dynaBean) {
41         this.dynaBean = dynaBean;
42     }
43      
44     /** Sets the context in which the tag will be run. */
45     public void setContext(JellyContext context) throws JellyTagException {
46         this.context = context;
47         beforeSetAttributes();
48     }
49     
50     /** Sets an attribute value of this tag before the tag is invoked
51      */
52     public void setAttribute(String JavaDoc name, Object JavaDoc value) throws JellyTagException {
53         getDynaBean().set(name, value);
54     }
55
56     /**
57      * @return the type of the given attribute. By default just return
58      * Object.class if this is not known.
59      */
60     public Class JavaDoc getAttributeType(String JavaDoc name) throws JellyTagException {
61         DynaProperty property = getDynaBean().getDynaClass().getDynaProperty(name);
62         if (property != null) {
63             return property.getType();
64         }
65         return Object JavaDoc.class;
66     }
67     
68     /**
69      * @return the DynaBean which is used to store the
70      * attributes of this tag
71      */
72     public DynaBean getDynaBean() {
73         return dynaBean;
74     }
75     
76     /**
77      * Sets the DynaBean which is used to store the
78      * attributes of this tag
79      */
80     public void setDynaBean(DynaBean dynaBean) {
81         this.dynaBean = dynaBean;
82     }
83
84     /**
85      * Callback to allow processing to occur before the attributes are about to be set
86      */
87     public void beforeSetAttributes() throws JellyTagException {
88     }
89     
90 }
91
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