Package org.eclipse.rdf4j.common.iteration

Class UnionIteration<E>

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E>

org.eclipse.rdf4j.common.iteration.LookAheadIteration<E>

org.eclipse.rdf4j.common.iteration.UnionIteration<E>

All Implemented Interfaces:

AutoCloseable, Iterator<E>, CloseableIteration<E>, IndexReportingIterator

public class UnionIteration<E>
extends LookAheadIteration<E>
implements IndexReportingIterator

An Iteration that returns the bag union of the results of a number of Iterations. 'Bag union' means that the UnionIteration does not filter duplicate objects.

Field Summary

Fields inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration

EMPTY_STATEMENT_ITERATION

Constructor Summary

Constructors

Constructor	Description
UnionIteration(Iterable<? extends CloseableIteration<? extends E>> args)	Creates a new UnionIteration that returns the bag union of the results of a number of Iterations.
UnionIteration(CloseableIteration<? extends E>... args)	Creates a new UnionIteration that returns the bag union of the results of a number of Iterations.

Method Summary

Modifier and Type	Method	Description
String	getIndexName()
protected E	getNextElement()	Gets the next element.
long	getSourceRowsFilteredActual()
long	getSourceRowsMatchedActual()
long	getSourceRowsScannedActual()
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.

Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration

hasNext, next, remove

Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration

close, isClosed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration

stream

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Details

UnionIteration

@SafeVarargs
public UnionIteration(CloseableIteration<? extends E>... args)

Creates a new UnionIteration that returns the bag union of the results of a number of Iterations.

Parameters:

args - The Iterations containing the elements to iterate over.

UnionIteration

public UnionIteration(Iterable<? extends CloseableIteration<? extends E>> args)

Creates a new UnionIteration that returns the bag union of the results of a number of Iterations.

Parameters:

args - The Iterations containing the elements to iterate over.

Method Details

getNextElement

protected E getNextElement()

Description copied from class: LookAheadIteration

Gets the next element. Subclasses should implement this method so that it returns the next element.

Specified by:

getNextElement in class LookAheadIteration<E>

Returns:

The next element, or null if no more elements are available.

handleClose

protected void handleClose()

Description copied from class: AbstractCloseableIteration

Called by AbstractCloseableIteration.close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.

Specified by:

handleClose in class AbstractCloseableIteration<E>

getIndexName

public String getIndexName()

Specified by:

getIndexName in interface IndexReportingIterator

getSourceRowsScannedActual

public long getSourceRowsScannedActual()

Specified by:

getSourceRowsScannedActual in interface IndexReportingIterator

getSourceRowsMatchedActual

public long getSourceRowsMatchedActual()

Specified by:

getSourceRowsMatchedActual in interface IndexReportingIterator

getSourceRowsFilteredActual

public long getSourceRowsFilteredActual()

Specified by:

getSourceRowsFilteredActual in interface IndexReportingIterator