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>

public class UnionIteration<E>
extends LookAheadIteration<E>

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 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
protected E	getNextElement()	Gets the next element.
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.

Methods inherited from class LookAheadIteration

hasNext, next, remove

Methods inherited from class AbstractCloseableIteration

close, isClosed

Methods inherited from class Object

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

Methods inherited from interface CloseableIteration

stream

Methods inherited from interface 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>