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Java > Open Source Codes > org > apache > cocoon > forms > expression > NullFunction


1 /*
2  * Copyright 1999-2004 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.cocoon.forms.expression;
17
18 import org.outerj.expression.AbstractExpression;
19 import org.outerj.expression.ExpressionContext;
20 import org.outerj.expression.ExpressionException;
21
22 /**
23  * Returns null constant.
24  *
25  * @author <a HREF="mailto:vadim.gritsenko@dc.gov">Vadim Gritsenko</a>
26  * @version $Id: NullFunction.java 151179 2005-02-03 16:55:16Z tim $
27  */
28 public class NullFunction extends AbstractExpression {
29
30     public Object JavaDoc evaluate(ExpressionContext context) throws ExpressionException {
31         return null;
32     }
33
34     public Class JavaDoc getResultType() {
35         return Object JavaDoc.class;
36     }
37
38     public String JavaDoc getDescription() {
39         return "Null function";
40     }
41 }
42
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