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com.hp.hpl.jena.reasoner.rulesys.impl.oldCode
Class TopGoalIterator  

java.lang.Object
  com.hp.hpl.jena.reasoner.rulesys.impl.oldCode.TopGoalIterator

All Implemented Interfaces:

java.util.Iterator

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public class TopGoalIterator

extends java.lang.Object

implements java.util.Iterator

Wraps up the backward chaining engine as an iterator-like object that can be used in InfGraphs to implement a "find" operation. It creates a top level GoalState and pumps that for results until the agenda is empty.

Version:

$Revision: 1.4 $ on $Date: 2005/02/21 12:18:06 $

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Field Summary
(package private)  BRuleEngine	engine           The parent backward chaining engine
(package private)  GoalState	goalState           The GoalState which is traversing the top level derivation tree
(package private)  java.lang.Object	lookAhead           The next result to be returned, or null if we have finished

 

Constructor Summary

TopGoalIterator(BRuleEngine engine, com.hp.hpl.jena.reasoner.TriplePattern goal)           Constructor.

 

Method Summary
void	close()
boolean	hasNext()           Tests whether there are elements remaining in the collection.
private  void	moveForward()           Find the next result in the goal state and put it in the lookahead buffer.
java.lang.Object	next()           Obtain the next element in the collection.
void	remove()           Remove from the underlying collection the last element returned by next (optional operation).

 

Methods inherited from class java.lang.Object

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

 

Field Detail

goalState

GoalState goalState

The GoalState which is traversing the top level derivation tree

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lookAhead

java.lang.Object lookAhead

The next result to be returned, or null if we have finished

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engine

BRuleEngine engine

The parent backward chaining engine

Constructor Detail

TopGoalIterator

public TopGoalIterator(BRuleEngine engine,
                       com.hp.hpl.jena.reasoner.TriplePattern goal)

Constructor. Wraps a top level goal state as an iterator

Method Detail

moveForward

private void moveForward()

Find the next result in the goal state and put it in the lookahead buffer.

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close

public void close()

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hasNext

public boolean hasNext()

Description copied from interface: java.util.Iterator

Tests whether there are elements remaining in the collection. In other words, calling next() will not throw an exception.

Specified by:

hasNext in interface java.util.Iterator

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next

public java.lang.Object next()

Description copied from interface: java.util.Iterator

Obtain the next element in the collection.

Specified by:

next in interface java.util.Iterator

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remove

public void remove()

Description copied from interface: java.util.Iterator

Remove from the underlying collection the last element returned by next (optional operation). This method can be called only once after each call to next(). It does not affect what will be returned by subsequent calls to next.

Specified by:

remove in interface java.util.Iterator

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