Module org.apache.jena.core

Package org.apache.jena.reasoner.rulesys.impl

Class LPTopGoalIterator

java.lang.Object

org.apache.jena.reasoner.rulesys.impl.LPTopGoalIterator

All Implemented Interfaces:

Iterator<Triple>, org.apache.jena.atlas.iterator.IteratorCloseable<Triple>, org.apache.jena.atlas.lib.Closeable, LPInterpreterContext, LPInterpreterState, ClosableIterator<Triple>

public class LPTopGoalIterator
extends Object
implements ClosableIterator<Triple>, LPInterpreterContext

Wraps up the results an LP rule engine instance into a conventional iterator. Ensures that the engine is closed and detached from the inference graph if the iterator hits the end of the result set.

Constructor Summary

Constructors

Constructor	Description
LPTopGoalIterator(LPInterpreter engine)	Constructor.

Method Summary

Modifier and Type	Method	Description
void	close()	Close the iterator.
boolean	hasNext()
boolean	isReady()	Return true if the iterator is ready to be scheduled (i.e. it is not known to be complete and not known to be waiting for a dependent generator).
Triple	next()
void	notifyBlockedOn(ConsumerChoicePointFrame ccp)	Notify this context that a branch was suspended awaiting further results from the given generator.
void	notifyFinished(ConsumerChoicePointFrame ccp)	Notify this context that the given choice point has terminated and can be remove from the wait list.
void	remove()
void	setReady(ConsumerChoicePointFrame ccp)	Directly set that this generator is ready (because the generating for one of its generatingCPs has produced new results).

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Details

LPTopGoalIterator

public LPTopGoalIterator(LPInterpreter engine)

Constructor. Wraps a top level goal state as an iterator

Method Details

notifyBlockedOn

public void notifyBlockedOn(ConsumerChoicePointFrame ccp)

Notify this context that a branch was suspended awaiting further results from the given generator.

Specified by:

notifyBlockedOn in interface LPInterpreterContext

notifyFinished

public void notifyFinished(ConsumerChoicePointFrame ccp)

Notify this context that the given choice point has terminated and can be remove from the wait list.

Specified by:

notifyFinished in interface LPInterpreterContext

setReady

public void setReady(ConsumerChoicePointFrame ccp)

Directly set that this generator is ready (because the generating for one of its generatingCPs has produced new results).

Specified by:

setReady in interface LPInterpreterContext

isReady

public boolean isReady()

Return true if the iterator is ready to be scheduled (i.e. it is not known to be complete and not known to be waiting for a dependent generator).

Specified by:

isReady in interface LPInterpreterContext

close

public void close()

Description copied from interface: ClosableIterator

Close the iterator. Other operations on this iterator may now throw an exception. A ClosableIterator may be closed as many times as desired - the subsequent calls do nothing.

Specified by:

close in interface ClosableIterator<Triple>

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable

See Also:

• ClosableIterator.close()

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Triple>

See Also:

• Iterator.hasNext()

next

public Triple next()

Specified by:

next in interface Iterator<Triple>

See Also:

• Iterator.next()

remove

public void remove()

Specified by:

remove in interface Iterator<Triple>

See Also:

• Iterator.remove()