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 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 getSymbol() {
45 return "!=";
46 }
47 }