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


1 /*
2  * Copyright 2003,2004 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.jexl.parser;
17
18 import org.apache.commons.jexl.JexlContext;
19
20 /**
21  * Size Method, e.g. size().
22  *
23  * @author <a HREF="mailto:mhw@kremvax.net">Mark H. Wilkinson</a>
24  * @version $Id: ASTSizeMethod.java 398324 2006-04-30 12:20:24Z dion $
25  */
26 public class ASTSizeMethod extends SimpleNode {
27     /**
28      * Create the node given an id.
29      *
30      * @param id node id.
31      */
32     public ASTSizeMethod(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 ASTSizeMethod(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     /**
52      * evaluate size as part of an expression on a base object.
53      *
54      * foo.bar.size
55      *
56      * @param jc the {@link JexlContext} to evaluate against.
57      * @param obj not used.
58      * @return the value of the array expression.
59      * @throws Exception on any error
60      */
61     public Object JavaDoc execute(Object JavaDoc obj, JexlContext jc) throws Exception JavaDoc {
62         return new Integer JavaDoc(ASTSizeFunction.sizeOf(obj));
63     }
64
65 }
66
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