Package org.eclipse.rdf4j.sail.memory.model

Class MemStatementIterator<X extends Exception>

java.lang.Object

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

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

org.eclipse.rdf4j.sail.memory.model.MemStatementIterator<X>

All Implemented Interfaces:

AutoCloseable, CloseableIteration<MemStatement,X>, Iteration<MemStatement,X>

public class MemStatementIterator<X extends Exception>
extends LookAheadIteration<MemStatement,X>

A StatementIterator that can iterate over a list of Statement objects. This iterator compares Resource and Literal objects using the '==' operator, which is possible thanks to the extensive sharing of these objects in the MemoryStore.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MIN_SIZE_TO_CONSIDER_FOR_CACHE

Constructor Summary

Constructors

Constructor	Description
MemStatementIterator(MemStatementList statementList, MemResource subject, MemIRI predicate, MemValue object, Boolean explicit, int snapshot, MemResource... contexts)	Creates a new MemStatementIterator that will iterate over the statements contained in the supplied MemStatementList searching for statements that match the specified pattern of subject, predicate, object and context(s).

Method Summary

Modifier and Type	Method	Description
static boolean	cacheAwareHasStatement(MemStatementList smallestList, MemResource subj, MemIRI pred, MemValue obj, Boolean explicit, int snapshot, MemResource[] memContexts, MemStatementIteratorCache iteratorCache)
static LookAheadIteration<MemStatement,SailException>	cacheAwareInstance(MemStatementList smallestList, MemResource subj, MemIRI pred, MemValue obj, Boolean explicit, int snapshot, MemResource[] memContexts, MemStatementIteratorCache iteratorCache)
boolean	equals(Object o)
protected MemStatement	getNextElement()	Searches through statementList, starting from index _nextStatementIdx + 1, for statements that match the constraints that have been set for this iterator.
org.eclipse.rdf4j.sail.memory.model.MemStatementIterator.Stats	getStats()
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.
int	hashCode()
String	toString()

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, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration

stream

Field Details

MIN_SIZE_TO_CONSIDER_FOR_CACHE

public static final int MIN_SIZE_TO_CONSIDER_FOR_CACHE

See Also:

• Constant Field Values

Constructor Details

MemStatementIterator

public MemStatementIterator(MemStatementList statementList,
 MemResource subject,
 MemIRI predicate,
 MemValue object,
 Boolean explicit,
 int snapshot,
 MemResource... contexts)
                     throws InterruptedException

Creates a new MemStatementIterator that will iterate over the statements contained in the supplied MemStatementList searching for statements that match the specified pattern of subject, predicate, object and context(s).

Parameters:

statementList - the statements over which to iterate.

subject - subject of pattern.

predicate - predicate of pattern.

object - object of pattern.

contexts - context(s) of pattern.

Throws:

InterruptedException

Method Details

cacheAwareInstance

public static LookAheadIteration<MemStatement,SailException> cacheAwareInstance(MemStatementList smallestList,
 MemResource subj,
 MemIRI pred,
 MemValue obj,
 Boolean explicit,
 int snapshot,
 MemResource[] memContexts,
 MemStatementIteratorCache iteratorCache)
                                                                         throws InterruptedException

Throws:

InterruptedException

cacheAwareHasStatement

public static boolean cacheAwareHasStatement(MemStatementList smallestList,
 MemResource subj,
 MemIRI pred,
 MemValue obj,
 Boolean explicit,
 int snapshot,
 MemResource[] memContexts,
 MemStatementIteratorCache iteratorCache)
                                      throws InterruptedException

Throws:

InterruptedException

getNextElement

protected MemStatement getNextElement()

Searches through statementList, starting from index _nextStatementIdx + 1, for statements that match the constraints that have been set for this iterator. If a matching statement has been found it will be stored in _nextStatement and _nextStatementIdx points to the index of this statement in _statementList. Otherwise, _nextStatement will set to null.

Specified by:

getNextElement in class LookAheadIteration<MemStatement,X extends Exception>

Returns:

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

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<MemStatement,X extends Exception>

Throws:

X

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

getStats

public org.eclipse.rdf4j.sail.memory.model.MemStatementIterator.Stats getStats()