01: /*
02: * Copyright 2002-2004 The Apache Software Foundation
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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
34: : Boolean.TRUE;
35: }
36:
37: protected int getPrecedence() {
38: return 2;
39: }
40:
41: protected boolean isSymmetric() {
42: return true;
43: }
44:
45: public String getSymbol() {
46: return "!=";
47: }
48: }
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