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Java > Open Source Codes > org > apache > commons > jelly > tags > define > DefineTagSupport


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.tags.define;
18
19 import org.apache.commons.jelly.JellyTagException;
20 import org.apache.commons.jelly.TagSupport;
21 import org.apache.commons.jelly.impl.DynamicTagLibrary;
22
23 /**
24  * An abstract base class useful for implementation inheritence.
25  *
26  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
27  * @version $Revision: 155420 $
28  */

29 public abstract class DefineTagSupport extends TagSupport {
30
31     // Implementation methods
32
//-------------------------------------------------------------------------
33

34     /**
35      * @return the current dynamic tag library instance or throws a JellyException
36      * if one is not available
37      */

38     protected DynamicTagLibrary getTagLibrary() throws JellyTagException {
39         TaglibTag tag
40             = (TaglibTag) findAncestorWithClass(TaglibTag.class);
41         if ( tag == null ) {
42             throw new JellyTagException( "<define:tag> must be inside <define:taglib>" );
43         }
44         return tag.getTagLibrary();
45     }
46
47 }
48
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