01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.woody.expression;
18:
19: import org.outerj.expression.AbstractExpression;
20: import org.outerj.expression.ExpressionContext;
21: import org.outerj.expression.ExpressionException;
22:
23: /**
24: * Returns null constant.
25: *
26: * @author <a href="mailto:vadim.gritsenko@dc.gov">Vadim Gritsenko</a>
27: * @version CVS $Id: NullFunction.java 433543 2006-08-22 06:22:54Z crossley $
28: */
29: public class NullFunction extends AbstractExpression {
30:
31: public Object evaluate(ExpressionContext context)
32: throws ExpressionException {
33: return null;
34: }
35:
36: public Class getResultType() {
37: return Object.class;
38: }
39:
40: public String getDescription() {
41: return "Null function";
42: }
43: }
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