001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.el;
018    
019    import javax.servlet.jsp.el.ELException;
020    
021    /**
022     *
023     * <p>This is the superclass for all equality operators (==, !=)
024     * 
025     * @author Nathan Abramson - Art Technology Group
026     * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: bayard $
027     **/
028    
029    public abstract class EqualityOperator
030      extends BinaryOperator
031    {
032      //-------------------------------------
033      /**
034       *
035       * Applies the operator to the given value
036       **/
037      public Object apply (Object pLeft,
038                           Object pRight)
039        throws ELException
040      {
041        return Coercions.applyEqualityOperator (pLeft, pRight, this);
042      }
043    
044      //-------------------------------------
045      /**
046       *
047       * Applies the operator given the fact that the two elements are
048       * equal.
049       **/
050      public abstract boolean apply (boolean pAreEqual);
051      
052      //-------------------------------------
053    }