org.projog.core.math

Class AbstractArithmeticOperator

java.lang.Object

org.projog.core.math.AbstractArithmeticOperator

All Implemented Interfaces:

KnowledgeBaseConsumer, ArithmeticOperator, PreprocessableArithmeticOperator

Direct Known Subclasses:

AbstractBinaryArithmeticOperator, AbstractBinaryIntegerArithmeticOperator, AbstractUnaryArithmeticOperator, Divide, Max, Min, Random, Round

public abstract class AbstractArithmeticOperator
extends Object
implements PreprocessableArithmeticOperator, KnowledgeBaseConsumer

Constructor Summary

Constructors

Constructor and Description
AbstractArithmeticOperator()

Method Summary

Modifier and Type	Method and Description
protected Numeric	calculate(Numeric n)
protected Numeric	calculate(Numeric n1, Numeric n2)
Numeric	calculate(Term[] args) Returns the result of the calculation using the specified arguments.
protected boolean	isPure() Indicates if this operator is pure and so can be preprocessed.
ArithmeticOperator	preprocess(Term expression)
void	setKnowledgeBase(KnowledgeBase kb) Provides a reference to a KnowledgeBase.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractArithmeticOperator

public AbstractArithmeticOperator()

Method Detail

setKnowledgeBase

public final void setKnowledgeBase(KnowledgeBase kb)

Provides a reference to a KnowledgeBase.

Meaning this object will always have access to a KnowledgeBase by the time its calculate method is invoked.

Specified by:

setKnowledgeBase in interface KnowledgeBaseConsumer

calculate

public final Numeric calculate(Term[] args)

Description copied from interface: ArithmeticOperator

Returns the result of the calculation using the specified arguments.

Specified by:

calculate in interface ArithmeticOperator

Parameters:

args - the arguments to use in the calculation

Returns:

the result of the calculation using the specified arguments

calculate

protected Numeric calculate(Numeric n)

calculate

protected Numeric calculate(Numeric n1,
                            Numeric n2)

preprocess

public final ArithmeticOperator preprocess(Term expression)

Specified by:

preprocess in interface PreprocessableArithmeticOperator

isPure

protected boolean isPure()

Indicates if this operator is pure and so can be preprocessed.

An operator is pure if multiple calls with identical arguments always produce the same result.

Returns:

true if pure and so can be preprocessed, else false