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