01: /*
02: * Copyright 2002,2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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)
39: throws MissingAttributeException {
40: if (var != null) {
41: context.removeVariable(var.evaluateAsString(context));
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: }
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