com.hp.hpl.jena.sparql.engine.iterator

Class QueryIteratorBase

java.lang.Object

com.hp.hpl.jena.sparql.util.PrintSerializableBase

com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase

All Implemented Interfaces:

QueryIterator, PrintSerializable, Iterator<Binding>, Printable, Closeable

Direct Known Subclasses:

CSVInputIterator, QueryIter, QueryIteratorResultSet, QueryIteratorWrapper, TSVInputIterator

public abstract class QueryIteratorBase
extends PrintSerializableBase
implements QueryIterator

This class provides the general machinary for iterators. This includes:

• autoclose when the iterator runs out
• ensuring query iterators only contain Bindings

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	traceIterators

Constructor Summary

Constructors

Constructor and Description
QueryIteratorBase()

Method Summary

Methods

Modifier and Type	Method and Description
void	cancel() Cancel this iterator
void	close()
String	debug()
boolean	hasNext() final - subclasses implement hasNextBinding()
Binding	next() final - autoclose and registration relies on it - implement moveToNextBinding()
Binding	nextBinding() final - subclasses implement moveToNextBinding()
void	remove()

Methods inherited from class com.hp.hpl.jena.sparql.util.PrintSerializableBase

output, toString, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.hp.hpl.jena.sparql.util.PrintSerializable

output, toString

Methods inherited from interface org.apache.jena.atlas.io.Printable

output

Field Detail

traceIterators

public static boolean traceIterators

Constructor Detail

QueryIteratorBase

public QueryIteratorBase()

Method Detail

hasNext

public final boolean hasNext()

final - subclasses implement hasNextBinding()

Specified by:

hasNext in interface Iterator<Binding>

next

public final Binding next()

final - autoclose and registration relies on it - implement moveToNextBinding()

Specified by:

next in interface Iterator<Binding>

nextBinding

public final Binding nextBinding()

final - subclasses implement moveToNextBinding()

Specified by:

nextBinding in interface QueryIterator

remove

public final void remove()

Specified by:

remove in interface Iterator<Binding>

close

public void close()

Specified by:

close in interface Closeable

cancel

public final void cancel()

Cancel this iterator

Specified by:

cancel in interface QueryIterator

debug

public String debug()