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.

Constructor Summary

Constructors

Constructor and 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 and Description
protected MemStatement	getNextElement() Searches through statementList, starting from index _nextStatementIdx + 1, for statements that match the constraints that have been set for this iterator.

Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration

handleClose, 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

Constructor Detail

MemStatementIterator

public 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).

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.

Method Detail

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.