    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  }