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* The Apache Software License, Version 1.1
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* Copyright (c) 1999 The Apache Software Foundation. All rights
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ====================================================================
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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package org.apache.commons.el;
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import javax.servlet.jsp.el.ELException;
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* <p>This is the superclass for all binary operators
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* @author Nathan Abramson - Art Technology Group
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* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
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public abstract class BinaryOperator
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//-------------------------------------
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public BinaryOperator ()
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//-------------------------------------
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//-------------------------------------
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* Returns the symbol representing the operator
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public abstract String getOperatorSymbol ();
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//-------------------------------------
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* Applies the operator to the given pair of values
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public abstract Object apply (Object pLeft,
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//-------------------------------------
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* Returns true if evaluation is necessary given the specified Left
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* value. The And/OrOperators make use of this
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public boolean shouldEvaluate (Object pLeft)
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//-------------------------------------
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* Returns true if the operator expects its arguments to be coerced
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* to Booleans. The And/Or operators set this to true.
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public boolean shouldCoerceToBoolean ()
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//-------------------------------------