org.eclipse.rdf4j.query.impl

Class BackgroundGraphResult

java.lang.Object

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

org.eclipse.rdf4j.common.iteration.IterationWrapper<Statement,QueryEvaluationException>

org.eclipse.rdf4j.query.impl.BackgroundGraphResult

All Implemented Interfaces:

AutoCloseable, Runnable, org.eclipse.rdf4j.common.iteration.CloseableIteration<Statement,QueryEvaluationException>, org.eclipse.rdf4j.common.iteration.Iteration<Statement,QueryEvaluationException>, GraphQueryResult, QueryResult<Statement>, RDFHandler

public class BackgroundGraphResult
extends org.eclipse.rdf4j.common.iteration.IterationWrapper<Statement,QueryEvaluationException>
implements GraphQueryResult, Runnable, RDFHandler

Provides concurrent access to statements as they are being parsed when instances of this class are run as Threads.

Author:

James Leigh

Field Summary

Fields inherited from class org.eclipse.rdf4j.common.iteration.IterationWrapper

wrappedIter

Constructor Summary

Constructors

Constructor and Description
BackgroundGraphResult(QueueCursor<Statement> queue, RDFParser parser, InputStream in, Charset charset, String baseURI)
BackgroundGraphResult(RDFParser parser, InputStream in, Charset charset, String baseURI)

Method Summary

Modifier and Type	Method and Description
void	endRDF()
Map<String,String>	getNamespaces() Retrieves relevant namespaces from the query result.
protected void	handleClose()
void	handleComment(String comment)
void	handleNamespace(String prefix, String uri)
void	handleStatement(Statement st)
boolean	hasNext()
Statement	next()
void	remove()
void	run()
void	startRDF()

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

close

Constructor Detail

BackgroundGraphResult

public BackgroundGraphResult(RDFParser parser,
                             InputStream in,
                             Charset charset,
                             String baseURI)

BackgroundGraphResult

public BackgroundGraphResult(QueueCursor<Statement> queue,
                             RDFParser parser,
                             InputStream in,
                             Charset charset,
                             String baseURI)

Method Detail

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Specified by:

hasNext in interface org.eclipse.rdf4j.common.iteration.Iteration<Statement,QueryEvaluationException>

Overrides:

hasNext in class org.eclipse.rdf4j.common.iteration.IterationWrapper<Statement,QueryEvaluationException>

Throws:

QueryEvaluationException

next

public Statement next()
               throws QueryEvaluationException

Specified by:

next in interface org.eclipse.rdf4j.common.iteration.Iteration<Statement,QueryEvaluationException>

Overrides:

next in class org.eclipse.rdf4j.common.iteration.IterationWrapper<Statement,QueryEvaluationException>

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

Specified by:

remove in interface org.eclipse.rdf4j.common.iteration.Iteration<Statement,QueryEvaluationException>

Overrides:

remove in class org.eclipse.rdf4j.common.iteration.IterationWrapper<Statement,QueryEvaluationException>

Throws:

QueryEvaluationException

handleClose

protected void handleClose()
                    throws QueryEvaluationException

Overrides:

handleClose in class org.eclipse.rdf4j.common.iteration.IterationWrapper<Statement,QueryEvaluationException>

Throws:

QueryEvaluationException

run

public void run()

Specified by:

run in interface Runnable

startRDF

public void startRDF()
              throws RDFHandlerException

Specified by:

startRDF in interface RDFHandler

Throws:

RDFHandlerException

getNamespaces

public Map<String,String> getNamespaces()

Description copied from interface: GraphQueryResult

Retrieves relevant namespaces from the query result.
The contents of the Map may be modified after it is returned, as the initial return may be performed when the first RDF Statement is encountered.

Specified by:

getNamespaces in interface GraphQueryResult

Returns:

a Map object containing (prefix, namespace) pairs.

handleComment

public void handleComment(String comment)
                   throws RDFHandlerException

Specified by:

handleComment in interface RDFHandler

Throws:

RDFHandlerException

handleNamespace

public void handleNamespace(String prefix,
                            String uri)
                     throws RDFHandlerException

Specified by:

handleNamespace in interface RDFHandler

Throws:

RDFHandlerException

handleStatement

public void handleStatement(Statement st)
                     throws RDFHandlerException

Specified by:

handleStatement in interface RDFHandler

Throws:

RDFHandlerException

endRDF

public void endRDF()
            throws RDFHandlerException

Specified by:

endRDF in interface RDFHandler

Throws:

RDFHandlerException