org.openrdf.query.algebra.evaluation.iterator
Class SPARQLMinusIteration<X extends Exception>

java.lang.Object
  info.aduna.iteration.CloseableIterationBase<E,X>
      info.aduna.iteration.IterationWrapper<E,X>
          info.aduna.iteration.FilterIteration<BindingSet,X>
              org.openrdf.query.algebra.evaluation.iterator.SPARQLMinusIteration<X>

All Implemented Interfaces:

CloseableIteration<BindingSet,X>, Iteration<BindingSet,X>

public class SPARQLMinusIteration<X extends Exception>
extends FilterIteration<BindingSet,X>

An Iteration that returns the results of an Iteration (the left argument) MINUS any results that are compatible with results of another Iteration (the right argument) or that have no shared variables. This iteration uses the formal definition of the SPARQL 1.1 MINUS operator to determine which BindingSets to return.

Author:

Jeen

See Also:

http://www.w3.org/TR/sparql11-query/#sparqlAlgebra

Field Summary

Fields inherited from class info.aduna.iteration.IterationWrapper

wrappedIter

Constructor Summary

SPARQLMinusIteration(Iteration<BindingSet,X> leftArg, Iteration<BindingSet,X> rightArg)
Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument.

SPARQLMinusIteration(Iteration<BindingSet,X> leftArg, Iteration<BindingSet,X> rightArg, boolean distinct)
Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument.

Method Summary

protected boolean	accept(BindingSet object) Tests whether or not the specified object should be returned by this Iteration.
protected void	handleClose() Closed this Iteration and also closes the wrapped Iteration if it is a CloseableIteration.

Methods inherited from class info.aduna.iteration.FilterIteration

hasNext, next

Methods inherited from class info.aduna.iteration.IterationWrapper

remove

Methods inherited from class info.aduna.iteration.CloseableIterationBase

close, isClosed

Methods inherited from class java.lang.Object

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

Constructor Detail

SPARQLMinusIteration

public SPARQLMinusIteration(Iteration<BindingSet,X> leftArg,
                            Iteration<BindingSet,X> rightArg)

Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument. By default, duplicates are not filtered from the results.

Parameters:

leftArg - An Iteration containing the main set of elements.

rightArg - An Iteration containing the set of elements that should be filtered from the main set.

SPARQLMinusIteration

public SPARQLMinusIteration(Iteration<BindingSet,X> leftArg,
                            Iteration<BindingSet,X> rightArg,
                            boolean distinct)

Creates a new MinusIteration that returns the results of the left argument minus the results of the right argument.

Parameters:

leftArg - An Iteration containing the main set of elements.

rightArg - An Iteration containing the set of elements that should be filtered from the main set.

distinct - Flag indicating whether duplicate elements should be filtered from the result.

Method Detail

accept

protected boolean accept(BindingSet object)
                  throws X extends Exception

Description copied from class: FilterIteration

Tests whether or not the specified object should be returned by this Iteration. All objects from the wrapped Iteration pass through this method in the same order as they are coming from the wrapped Iteration.

Specified by:

accept in class FilterIteration<BindingSet,X extends Exception>

Parameters:

object - The object to be tested.

Returns:

true if the object should be returned, false otherwise.

Throws:

X

X extends Exception

handleClose

protected void handleClose()
                    throws X extends Exception

Description copied from class: IterationWrapper

Closed this Iteration and also closes the wrapped Iteration if it is a CloseableIteration.

Overrides:

handleClose in class FilterIteration<BindingSet,X extends Exception>

Throws:

X

X extends Exception