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Java > Open Source Codes > org > apache > commons > jexl > parser > ASTNullLiteral


1 /*
2  * Copyright 2002-2006 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.jexl.parser;
18
19 import org.apache.commons.jexl.JexlContext;
20
21 /**
22  * 'null'.
23  *
24  * @author <a HREF="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
25  */
26 public class ASTNullLiteral extends SimpleNode {
27     /**
28      * Create the node given an id.
29      *
30      * @param id node id.
31      */
32     public ASTNullLiteral(int id) {
33         super(id);
34     }
35
36     /**
37      * Create a node with the given parser and id.
38      *
39      * @param p a parser.
40      * @param id node id.
41      */
42     public ASTNullLiteral(Parser p, int id) {
43         super(p, id);
44     }
45
46     /** {@inheritDoc} */
47     public Object JavaDoc jjtAccept(ParserVisitor visitor, Object JavaDoc data) {
48         return visitor.visit(this, data);
49     }
50
51     /** {@inheritDoc} */
52     public Object JavaDoc value(JexlContext context) {
53         return null;
54     }
55 }
56
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