/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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*
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* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
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* Foundation" must not be used to endorse or promote products derived
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* ====================================================================
*
* This software consists of voluntary contributions made by many
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package org.jbpm.jpdl.el.impl;
import org.jbpm.jpdl.el.ELException;
/**
*
* <p>This is the superclass for all binary operators
*
* @author Nathan Abramson - Art Technology Group
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
**/
public abstract class BinaryOperator
{
//-------------------------------------
/**
*
* Constructor
**/
public BinaryOperator ()
{
}
//-------------------------------------
// Expression methods
//-------------------------------------
/**
*
* Returns the symbol representing the operator
**/
public abstract String getOperatorSymbol ();
//-------------------------------------
/**
*
* Applies the operator to the given pair of values
**/
public abstract Object apply (Object pLeft,
Object pRight,
Logger pLogger)
throws ELException;
//-------------------------------------
/**
*
* Returns true if evaluation is necessary given the specified Left
* value. The And/OrOperators make use of this
**/
public boolean shouldEvaluate (Object pLeft)
{
return true;
}
//-------------------------------------
/**
*
* Returns true if the operator expects its arguments to be coerced
* to Booleans. The And/Or operators set this to true.
**/
public boolean shouldCoerceToBoolean ()
{
return false;
}
//-------------------------------------
}