org.openrdf.query.algebra.evaluation.iterator
Class BadlyDesignedLeftJoinIterator

java.lang.Object
  info.aduna.iteration.CloseableIterationBase<E,X>
      info.aduna.iteration.LookAheadIteration<BindingSet,QueryEvaluationException>
          org.openrdf.query.algebra.evaluation.iterator.LeftJoinIterator
              org.openrdf.query.algebra.evaluation.iterator.BadlyDesignedLeftJoinIterator

All Implemented Interfaces:

CloseableIteration<BindingSet,QueryEvaluationException>, Iteration<BindingSet,QueryEvaluationException>

public class BadlyDesignedLeftJoinIterator
extends LeftJoinIterator

Author:

Arjohn Kampman

Constructor Summary

BadlyDesignedLeftJoinIterator(EvaluationStrategy strategy, LeftJoin join, BindingSet inputBindings, Set<String> problemVars)

Method Summary

protected BindingSet

getNextElement() Gets the next element.

Methods inherited from class org.openrdf.query.algebra.evaluation.iterator.LeftJoinIterator

handleClose

Methods inherited from class info.aduna.iteration.LookAheadIteration

hasNext, next, 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

BadlyDesignedLeftJoinIterator

public BadlyDesignedLeftJoinIterator(EvaluationStrategy strategy,
                                     LeftJoin join,
                                     BindingSet inputBindings,
                                     Set<String> problemVars)
                              throws QueryEvaluationException

Throws:

QueryEvaluationException

Method Detail

getNextElement

protected BindingSet getNextElement()
                             throws QueryEvaluationException

Description copied from class: LookAheadIteration

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

Overrides:

getNextElement in class LeftJoinIterator

Returns:

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

Throws:

QueryEvaluationException