Package org.eclipse.rdf4j.query.algebra.evaluation.iterator

Class BottomUpJoinIterator

java.lang.Object

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

org.eclipse.rdf4j.common.iteration.LookAheadIteration<BindingSet,QueryEvaluationException>

org.eclipse.rdf4j.query.algebra.evaluation.iterator.BottomUpJoinIterator

All Implemented Interfaces:

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

@Deprecated
public class BottomUpJoinIterator
extends LookAheadIteration<BindingSet,QueryEvaluationException>

Deprecated.

replaced by HashJoinIteration

Join Iterator that executes a basic bottom-up hash-join algorithm. To be used in cases where interleaved iteration joining is not appropriate (e.g. when the join arguments are subselects).

Author:

jeen

Constructor Summary

Constructors

Constructor	Description
BottomUpJoinIterator(EvaluationStrategy strategy, Join join, BindingSet bindings)	Deprecated.

Method Summary

Modifier and Type	Method	Description
protected void	add(List<BindingSet> leftArgResults, BindingSet b)	Deprecated.
protected void	addAll(List<BindingSet> hashTableValues, List<BindingSet> values)	Deprecated.
protected long	clearHashTable()	Deprecated.
protected BindingSet	getNextElement()	Deprecated. Gets the next element.
protected void	handleClose()	Deprecated. Called by AbstractCloseableIteration.close() when it is called for the first time.
protected List<BindingSet>	makeList()	Deprecated. Utility methods to make it easier to inserted custom store dependent list
protected List<BindingSet>	makeList(List<BindingSet> key)	Deprecated. Utility methods to make it easier to inserted custom store dependent list
protected Map<BindingSet,List<BindingSet>>	makeMap()	Deprecated. Utility methods to make it easier to inserted custom store dependent maps
protected void	put(Map<BindingSet,List<BindingSet>> hashTable, BindingSet hashKey, List<BindingSet> hashValue)	Deprecated.
protected BindingSet	removeFirstElement(List<BindingSet> list)	Deprecated. Remove the first (0 index) element from a BindingSet list.

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.CloseableIteration

stream

Constructor Details

BottomUpJoinIterator

public BottomUpJoinIterator(EvaluationStrategy strategy,
 Join join,
 BindingSet bindings)
                     throws QueryEvaluationException

Deprecated.

Throws:

QueryEvaluationException

Method Details

getNextElement

protected BindingSet getNextElement()
                             throws QueryEvaluationException

Deprecated.

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<BindingSet,QueryEvaluationException>

Returns:

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

Throws:

QueryEvaluationException

handleClose

protected void handleClose()
                    throws QueryEvaluationException

Deprecated.

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<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException

clearHashTable

protected long clearHashTable()

Deprecated.

Returns:

the size that the hashtable had before clearing it.

put

protected void put(Map<BindingSet,List<BindingSet>> hashTable,
 BindingSet hashKey,
 List<BindingSet> hashValue)
            throws QueryEvaluationException

Deprecated.

Throws:

QueryEvaluationException

addAll

protected void addAll(List<BindingSet> hashTableValues,
 List<BindingSet> values)
               throws QueryEvaluationException

Deprecated.

Throws:

QueryEvaluationException

add

protected void add(List<BindingSet> leftArgResults,
 BindingSet b)
            throws QueryEvaluationException

Deprecated.

Throws:

QueryEvaluationException

makeMap

protected Map<BindingSet,List<BindingSet>> makeMap()

Deprecated.

Utility methods to make it easier to inserted custom store dependent maps

Returns:

map

makeList

protected List<BindingSet> makeList()

Deprecated.

Utility methods to make it easier to inserted custom store dependent list

Returns:

list

makeList

protected List<BindingSet> makeList(List<BindingSet> key)

Deprecated.

Utility methods to make it easier to inserted custom store dependent list

Returns:

list

removeFirstElement

protected BindingSet removeFirstElement(List<BindingSet> list)
                                 throws QueryEvaluationException

Deprecated.

Remove the first (0 index) element from a BindingSet list.

Parameters:

list - which is worked on.

Returns:

the removed BindingSet

Throws:

QueryEvaluationException