Module org.apache.jena.arq

Package org.apache.jena.sparql.exec

Class RowSetMem

java.lang.Object

org.apache.jena.sparql.exec.RowSetMem

All Implemented Interfaces:

Iterator<Binding>, org.apache.jena.atlas.iterator.IteratorCloseable<Binding>, org.apache.jena.atlas.lib.Closeable, RowSet, RowSetRewindable

public class RowSetMem
extends Object
implements RowSetRewindable

A row set held in-memory which is rewindable and peekable

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.jena.sparql.exec.RowSet

RowSet.Exception

Method Summary

Modifier and Type	Method	Description
void	close()	Normally a RowSet is processed until complete which implicitly closes any underlying resources.
static RowSetRewindable	create(RowSet rowSet)
List<Var>	getResultVars()	Get the variable names for the projection
long	getRowNumber()	Return the "row" number for the current iterator item
boolean	hasNext()	Is there another row?
Binding	next()	Moves onto the next result possibility.
Binding	peek()
void	reset()
void	rewind()	Reset this result set back to the beginning
long	size()	Return the number of rows (not the number remaining in an iterator)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Methods inherited from interface org.apache.jena.sparql.exec.RowSet

forEach, materialize, rewindable, stream

Method Details

create

public static RowSetRewindable create(RowSet rowSet)

hasNext

public boolean hasNext()

Is there another row?

Specified by:

hasNext in interface Iterator<Binding>

Specified by:

hasNext in interface RowSet

next

public Binding next()

Moves onto the next result possibility.

Specified by:

next in interface Iterator<Binding>

Specified by:

next in interface RowSet

rewind

public void rewind()

Reset this result set back to the beginning

reset

public void reset()

Specified by:

reset in interface RowSetRewindable

getRowNumber

public long getRowNumber()

Return the "row" number for the current iterator item

Specified by:

getRowNumber in interface RowSet

size

public long size()

Return the number of rows (not the number remaining in an iterator)

Specified by:

size in interface RowSetRewindable

getResultVars

public List<Var> getResultVars()

Get the variable names for the projection

Specified by:

getResultVars in interface RowSet

peek

public Binding peek()

close

public void close()

Description copied from interface: RowSet

Normally a RowSet is processed until complete which implicitly closes any underlying resources. This "close" operation exists to explicitly end use of the RowSet in cases where it does happen. There is no need to close RowSets normally - it is the QueryExec that should be closed.

Specified by:

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

Specified by:

close in interface RowSet