Package org.eclipse.rdf4j.common.iteration

Class UnionIteration<E,X extends Exception>

java.lang.Object

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

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

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

All Implemented Interfaces:

AutoCloseable, CloseableIteration<E,X>, Iteration<E,X>

public class UnionIteration<E,X extends Exception>
extends LookAheadIteration<E,X>

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.

Constructor Summary

Constructors

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

stream

Constructor Details

UnionIteration

public UnionIteration(Iteration<? extends E,X>... 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 Iteration<? extends E,X>> 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()
                    throws X

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,X extends Exception>

Returns:

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

Throws:

X extends Exception

handleClose

protected void handleClose()
                    throws X

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.

Overrides:

handleClose in class LookAheadIteration<E,X extends Exception>

Throws:

X