BinaryOperator (jbpm-3.1.3) - JBoss JBPM 3.1.3 API 英文版文档

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org.jbpm.jpdl.el.impl
Class BinaryOperator

java.lang.Object
  org.jbpm.jpdl.el.impl.BinaryOperator

Direct Known Subclasses:: AndOperator, ArithmeticOperator, DivideOperator, EqualityOperator, IntegerDivideOperator, ModulusOperator, OrOperator, RelationalOperator

public abstract class BinaryOperator
extends java.lang.Object
extends java.lang.Object

This is the superclass for all binary operators

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

Constructor Summary

BinaryOperator()
          Constructor

Method Summary

abstract java.lang.Object apply(java.lang.Object pLeft, java.lang.Object pRight, Logger pLogger)
          Applies the operator to the given pair of values

abstract java.lang.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(java.lang.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 Summary
`BinaryOperator()` Constructor

Method Summary
`abstract java.lang.Object`	`apply(java.lang.Object pLeft, java.lang.Object pRight, Logger pLogger)` Applies the operator to the given pair of values
`abstract java.lang.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(java.lang.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 java.lang.String getOperatorSymbol()

Returns the symbol representing the operator

apply

public abstract java.lang.Object apply(java.lang.Object pLeft,
                                       java.lang.Object pRight,
                                       Logger pLogger)
                                throws ELException

Applies the operator to the given pair of values

Throws:: ELException

shouldEvaluate

public boolean shouldEvaluate(java.lang.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.