org.ontoware.rdfreactor.runtime

Class ExtractingIterator

java.lang.Object

org.ontoware.rdfreactor.runtime.ExtractingIterator

All Implemented Interfaces:

Iterator<Node>, ClosableIterator<Node>

public class ExtractingIterator
extends Object
implements ClosableIterator<Node>

An Iterator over nodes, based on an iterator over QueryRow, such as returned by sparqlSelect(..). Extracts a single variable from a QueryRow.

Author:

voelkel

Constructor Summary

Constructors

Constructor and Description
ExtractingIterator(Model model, ClosableIterator<QueryRow> it, String extractVariable)

Method Summary

Modifier and Type	Method and Description
void	close() The uderlying implementation frees resources.
Model	getModel()
boolean	hasNext() Returns true if the iteration has more elements.
Node	next() Returns the next element in the iteration.
void	remove() Removes from the underlying collection the last element returned by the iterator (optional operation).

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

ExtractingIterator

public ExtractingIterator(Model model,
                          ClosableIterator<QueryRow> it,
                          String extractVariable)

Method Detail

hasNext

public boolean hasNext()

Description copied from interface: ClosableIterator

Returns true if the iteration has more elements. (In other words, returns true if next would return an element rather than throwing an exception.)

Specified by:

hasNext in interface Iterator<Node>

Specified by:

hasNext in interface ClosableIterator<Node>

Returns:

true if the iterator has more elements.

next

public Node next()

Description copied from interface: ClosableIterator

Returns the next element in the iteration. Calling this method repeatedly until the ClosableIterator.hasNext() method returns false will return each element in the underlying collection exactly once.

Specified by:

next in interface Iterator<Node>

Specified by:

next in interface ClosableIterator<Node>

Returns:

the next element in the iteration.

remove

public void remove()

Description copied from interface: ClosableIterator

Removes from the underlying collection the last element returned by the iterator (optional operation). This method can be called only once per call to next. The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method.

Specified by:

remove in interface Iterator<Node>

Specified by:

remove in interface ClosableIterator<Node>

close

public void close()

Description copied from interface: ClosableIterator

The uderlying implementation frees resources. For some it is absolutely necessary to call this method.

Specified by:

close in interface ClosableIterator<Node>

getModel

public Model getModel()