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Java > Open Source Codes > org > apache > commons > jelly > tags > core > RemoveTag


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 package org.apache.commons.jelly.tags.core;
17
18 import org.apache.commons.jelly.MissingAttributeException;
19 import org.apache.commons.jelly.TagSupport;
20 import org.apache.commons.jelly.XMLOutput;
21 import org.apache.commons.jelly.expression.Expression;
22
23 /**
24  * A tag which removes the variable of the given name from the current variable scope.
25  *
26  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
27  * @version $Revision: 155420 $
28  */
29 public class RemoveTag extends TagSupport {
30
31     private Expression var;
32
33     public RemoveTag() {
34     }
35
36     // Tag interface
37 //-------------------------------------------------------------------------
38 public void doTag(XMLOutput output) throws MissingAttributeException {
39         if (var != null) {
40             context.removeVariable( var.evaluateAsString(context) );
41         }
42         else {
43             throw new MissingAttributeException("var");
44         }
45     }
46
47     // Properties
48 //-------------------------------------------------------------------------
49
50     /**
51      * Sets the name of the variable which will be removed by this tag..
52      */
53     public void setVar(Expression var) {
54         this.var = var;
55     }
56 }
57
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