Module org.apache.jena.arq

Package org.apache.jena.sparql.engine.iterator

Class QueryIter

java.lang.Object

org.apache.jena.sparql.util.PrintSerializableBase

org.apache.jena.sparql.engine.iterator.QueryIteratorBase

org.apache.jena.sparql.engine.iterator.QueryIter

All Implemented Interfaces:

Iterator<Binding>, org.apache.jena.atlas.io.Printable, org.apache.jena.atlas.iterator.IteratorCloseable<Binding>, org.apache.jena.atlas.lib.Closeable, QueryIterator, PrintSerializable

Direct Known Subclasses:

QueryIter1, QueryIter2, QueryIterConcat, QueryIterExtendByVar, QueryIterNullIterator, QueryIterPlainWrapper, QueryIterSub, QueryIterTracked, QueryIterYieldN

public abstract class QueryIter
extends QueryIteratorBase

This class provides the machinery for trackable iterators.

Constructor Summary

Constructors

Constructor	Description
QueryIter(ExecutionContext execCxt)

Method Summary

Modifier and Type	Method	Description
final void	close()
static QueryIter	flatMap(QueryIterator input, Function<Binding,QueryIterator> mapper, ExecutionContext execCxt)	flatmap.
ExecutionContext	getExecContext()
int	getIteratorNumber()
static QueryIter	makeTracked(QueryIterator qIter, ExecutionContext execCxt)
static QueryIterator	map(QueryIterator qIter, Map<Var,Var> varMapping)
static QueryIterator	materialize(QueryIterator qIter)
static QueryIter	materialize(QueryIterator qIter, ExecutionContext execCxt)
void	output(org.apache.jena.atlas.io.IndentedWriter out)	Normally overridden for better information
void	output(org.apache.jena.atlas.io.IndentedWriter out, SerializationContext sCxt)

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIteratorBase

cancel, hasNext, next, nextBinding, remove

Methods inherited from class org.apache.jena.sparql.util.PrintSerializableBase

toString, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Methods inherited from interface org.apache.jena.sparql.util.PrintSerializable

toString

Methods inherited from interface org.apache.jena.sparql.engine.QueryIterator

isJoinIdentity

Constructor Details

QueryIter

public QueryIter(ExecutionContext execCxt)

Method Details

makeTracked

public static QueryIter makeTracked(QueryIterator qIter,
 ExecutionContext execCxt)

materialize

public static QueryIter materialize(QueryIterator qIter,
 ExecutionContext execCxt)

materialize

public static QueryIterator materialize(QueryIterator qIter)

map

public static QueryIterator map(QueryIterator qIter,
 Map<Var,Var> varMapping)

flatMap

public static QueryIter flatMap(QueryIterator input,
 Function<Binding,QueryIterator> mapper,
 ExecutionContext execCxt)

flatmap. The mapper may return null to signal "no iterator for this binding"

close

public final void close()

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable

Overrides:

close in class QueryIteratorBase

getExecContext

public ExecutionContext getExecContext()

getIteratorNumber

public int getIteratorNumber()

output

public void output(org.apache.jena.atlas.io.IndentedWriter out)

Description copied from class: PrintSerializableBase

Normally overridden for better information

Specified by:

output in interface org.apache.jena.atlas.io.Printable

Overrides:

output in class PrintSerializableBase

output

public void output(org.apache.jena.atlas.io.IndentedWriter out,
 SerializationContext sCxt)