org.jbpm.jpdl.el.impl.BinaryOperator Maven / Gradle / Ivy
/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
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*
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* any, must include the following acknowlegement:
* "This product includes software developed by the
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* 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;
}
//-------------------------------------
}