Package org.apache.taglibs.standard.lang.jstl

Class BinaryOperator

java.lang.Object

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: kchung $

Author:

Nathan Abramson - Art Technology Group

Constructor Summary

Constructors

Constructor	Description
BinaryOperator()	Constructor

Method Summary

Modifier and Type	Method	Description
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.