net.fortytwo.ripple.query

Class StackEvaluator

java.lang.Object

net.fortytwo.ripple.query.Evaluator<RippleList,RippleList,ModelConnection>

net.fortytwo.ripple.query.StackEvaluator

All Implemented Interfaces:

Mapping<RippleList,RippleList,ModelConnection>, StackMapping

Direct Known Subclasses:

LazyEvaluatingIterator.WrappingEvaluator, LazyStackEvaluator, RankingEvaluator

public abstract class StackEvaluator
extends Evaluator<RippleList,RippleList,ModelConnection>
implements StackMapping

Author: josh Date: Feb 11, 2008 Time: 3:15:35 PM

Constructor Summary

Constructors

Constructor and Description
StackEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
int	arity()
StackMapping	getInverse()

Methods inherited from class net.fortytwo.ripple.query.Evaluator

isTransparent, stop

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.fortytwo.flow.Mapping

apply, isTransparent

Constructor Detail

StackEvaluator

public StackEvaluator()

Method Detail

arity

public int arity()

Specified by:

arity in interface StackMapping

Returns:

the fixed number of arguments which this function consumes before computing a result.

getInverse

public StackMapping getInverse()
                        throws RippleException

Specified by:

getInverse in interface StackMapping

Returns:

the StackMapping exactly inverse to this mapping, or a NullMapping if no such mapping can be defined.

Throws:

RippleException - if the inverse cannot be determined