org.apache.solr.client.solrj.io.stream

Class PushBackStream

java.lang.Object

org.apache.solr.client.solrj.io.stream.TupleStream

org.apache.solr.client.solrj.io.stream.PushBackStream

All Implemented Interfaces:

Closeable, Serializable, AutoCloseable, Expressible, MapSerializable, MapWriter

public class PushBackStream
extends TupleStream
implements Expressible

A TupleStream that allows a single Tuple to be pushed back onto the stream after it's been read. This is a useful class when building streams that maintain the order of Tuples between multiple substreams.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.solr.client.solrj.io.stream.TupleStream

TupleStream.IgnoreException

Nested classes/interfaces inherited from interface org.apache.solr.common.MapWriter

MapWriter.EntryWriter

Constructor Summary

Constructors

Constructor and Description
PushBackStream(TupleStream stream)

Method Summary

Modifier and Type	Method and Description
List<TupleStream>	children()
void	close()
int	getCost()
StreamComparator	getStreamSort() Return the stream sort - ie, the order in which records are returned This returns the streamSort of the substream
void	open()
void	pushBack(Tuple tuple)
Tuple	read()
void	setStreamContext(StreamContext context)
Explanation	toExplanation(StreamFactory factory) Returns an explanation about the stream object
StreamExpressionParameter	toExpression(StreamFactory factory)

Methods inherited from class org.apache.solr.client.solrj.io.stream.TupleStream

getShards, getSlices, getStreamNodeId, writeMap

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.solr.common.MapWriter

toMap

Constructor Detail

PushBackStream

public PushBackStream(TupleStream stream)

Method Detail

toExpression

public StreamExpressionParameter toExpression(StreamFactory factory)
                                       throws IOException

Specified by:

toExpression in interface Expressible

Throws:

IOException

toExplanation

public Explanation toExplanation(StreamFactory factory)
                          throws IOException

Description copied from interface: Expressible

Returns an explanation about the stream object

Specified by:

toExplanation in interface Expressible

Specified by:

toExplanation in class TupleStream

Parameters:

factory - Stream factory for this, contains information about the function name

Returns:

Explanation about this stream object containing explanations of any child stream objects

Throws:

IOException - throw on any error

setStreamContext

public void setStreamContext(StreamContext context)

Specified by:

setStreamContext in class TupleStream

children

public List<TupleStream> children()

Specified by:

children in class TupleStream

open

public void open()
          throws IOException

Specified by:

open in class TupleStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class TupleStream

Throws:

IOException

pushBack

public void pushBack(Tuple tuple)

read

public Tuple read()
           throws IOException

Specified by:

read in class TupleStream

Throws:

IOException

getStreamSort

public StreamComparator getStreamSort()

Return the stream sort - ie, the order in which records are returned This returns the streamSort of the substream

Specified by:

getStreamSort in class TupleStream

getCost

public int getCost()

Overrides:

getCost in class TupleStream