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Java > Open Source Codes > org > apache > commons > jxpath > ri > compiler > CoreOperationNotEqual


1 /*
2  * Copyright 2002-2004 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.jxpath.ri.compiler;
17
18 import org.apache.commons.jxpath.ri.EvalContext;
19
20 /**
21  * Implementation of Expression for the operation "!=".
22  *
23  * @author Dmitri Plotnikov
24  * @version $Revision: 1.3 $ $Date: 2004/02/29 14:17:38 $
25  */
26 public class CoreOperationNotEqual extends CoreOperationCompare {
27
28     public CoreOperationNotEqual(Expression arg1, Expression arg2) {
29         super(arg1, arg2);
30     }
31
32     public Object JavaDoc computeValue(EvalContext context) {
33         return equal(context, args[0], args[1]) ? Boolean.FALSE : Boolean.TRUE;
34     }
35     
36     protected int getPrecedence() {
37         return 2;
38     }
39
40     protected boolean isSymmetric() {
41         return true;
42     }
43     
44     public String JavaDoc getSymbol() {
45         return "!=";
46     }
47 }
48
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