org.apache.taglibs.standard.lang.jstl
Class BinaryOperator

java.lang.Object
  extended by org.apache.taglibs.standard.lang.jstl.BinaryOperator
Direct Known Subclasses:
AndOperator, ArithmeticOperator, DivideOperator, EqualityOperator, IntegerDivideOperator, ModulusOperator, OrOperator, RelationalOperator

public abstract class BinaryOperator
extends Object

This is the superclass for all binary operators

Version:
$Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tcfujii $
Author:
Nathan Abramson - Art Technology Group

Constructor Summary
BinaryOperator()
          Constructor
 
Method Summary
abstract  Object apply(Object pLeft, Object pRight, Object pContext, Logger pLogger)
          Applies the operator to the given pair of values
abstract  String getOperatorSymbol()
          Returns the symbol representing the operator
 boolean shouldCoerceToBoolean()
          Returns true if the operator expects its arguments to be coerced to Booleans.
 boolean shouldEvaluate(Object pLeft)
          Returns true if evaluation is necessary given the specified Left value.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BinaryOperator

public BinaryOperator()
Constructor

Method Detail

getOperatorSymbol

public abstract String getOperatorSymbol()
Returns the symbol representing the operator


apply

public abstract Object apply(Object pLeft,
                             Object pRight,
                             Object pContext,
                             Logger pLogger)
                      throws ELException
Applies the operator to the given pair of values

Throws:
ELException

shouldEvaluate

public boolean shouldEvaluate(Object pLeft)
Returns true if evaluation is necessary given the specified Left value. The And/OrOperators make use of this


shouldCoerceToBoolean

public boolean shouldCoerceToBoolean()
Returns true if the operator expects its arguments to be coerced to Booleans. The And/Or operators set this to true.



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