Class LookAheadIteration<E>
- java.lang.Object
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- org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E>
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- org.eclipse.rdf4j.common.iteration.LookAheadIteration<E>
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- All Implemented Interfaces:
AutoCloseable
,Iterator<E>
,CloseableIteration<E>
- Direct Known Subclasses:
AsyncIteratorBuffer
,AsyncIteratorDirect
,AsyncIteratorReadAhead
,CrossProductIteration
,DescribeIteration
,DistinctModelReducingUnionIteration
,FedXPathIteration
,FedXZeroLengthPathIteration
,FilteringIteration
,HashJoinIteration
,IndependentJoingroupBindingsIteration
,IndependentJoingroupBindingsIteration2
,IndependentJoingroupBindingsIteration3
,JoinExecutorBase
,JoinIterator
,LeftJoinIterator
,MemTripleIterator
,MultiProjectionIterator
,ParallelExecutorBase
,ParallelServiceExecutor
,PathIteration
,QueueIteration
,SortedIteration
,SPARQLCrossProductIteration
,UnionIteration
,ZeroLengthPathIteration
public abstract class LookAheadIteration<E> extends AbstractCloseableIteration<E>
An Iteration that looks one element ahead, if necessary, to handle calls tohasNext()
. This is a convenient super class for Iterations that have no easy way to tell if there are any more results, but still should implement the java.util.Iteration interface.
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Constructor Summary
Constructors Modifier Constructor Description protected
LookAheadIteration()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description protected abstract E
getNextElement()
Gets the next element.boolean
hasNext()
E
next()
void
remove()
Throws anUnsupportedOperationException
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Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration
close, handleClose, isClosed
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration
stream
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Methods inherited from interface java.util.Iterator
forEachRemaining
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Method Detail
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getNextElement
protected abstract E getNextElement()
Gets the next element. Subclasses should implement this method so that it returns the next element.- Returns:
- The next element, or null if no more elements are available.
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hasNext
public final boolean hasNext()
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next
public final E next()
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remove
public void remove()
Throws anUnsupportedOperationException
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