com.espertech.esper.epl.join.assemble
Class RootCartProdAssemblyNode

java.lang.Object
  com.espertech.esper.epl.join.assemble.BaseAssemblyNode
      com.espertech.esper.epl.join.assemble.RootCartProdAssemblyNode

All Implemented Interfaces:

ResultAssembler

public class RootCartProdAssemblyNode
extends BaseAssemblyNode

Assembly node for an event stream that is a root with a two or more child nodes below it.

Field Summary

Fields inherited from class com.espertech.esper.epl.join.assemble.BaseAssemblyNode

childNodes, numStreams, parentNode, streamNum

Constructor Summary

RootCartProdAssemblyNode(int streamNum, int numStreams, boolean allSubStreamsOptional, int[] childStreamIndex)
Ctor.

Method Summary

protected static int[][]	computeCombined(int[][] subStreamsPerChild) Compute an array of supersets of sub stream numbers per stream, for at least 3 or more streams.
void	init(java.util.List<Node>[] result) Provides results to assembly nodes for initialization.
void	print(IndentWriter indentWriter) Output this node using writer, not outputting child nodes.
void	process(java.util.List<Node>[] result, java.util.Collection<EventBean[]> resultFinalRows, EventBean resultRootEvent) Process results.
void	result(EventBean[] row, int fromStreamNum, EventBean myEvent, Node myNode, java.util.Collection<EventBean[]> resultFinalRows, EventBean resultRootEvent) Publish a result row.

Methods inherited from class com.espertech.esper.epl.join.assemble.BaseAssemblyNode

addChild, getChildNodes, getStreamNum, getSubstreams, setParentAssembler

Methods inherited from class java.lang.Object

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

Constructor Detail

RootCartProdAssemblyNode

public RootCartProdAssemblyNode(int streamNum,
                                int numStreams,
                                boolean allSubStreamsOptional,
                                int[] childStreamIndex)

Ctor.

Parameters:

streamNum - - is the stream number

numStreams - - is the number of streams

allSubStreamsOptional - - true if all substreams are optional and none are required

Method Detail

init

public void init(java.util.List<Node>[] result)

Description copied from class: BaseAssemblyNode

Provides results to assembly nodes for initialization.

Specified by:

init in class BaseAssemblyNode

Parameters:

result - is a list of result nodes per stream

process

public void process(java.util.List<Node>[] result,
                    java.util.Collection<EventBean[]> resultFinalRows,
                    EventBean resultRootEvent)

Description copied from class: BaseAssemblyNode

Process results.

Specified by:

process in class BaseAssemblyNode

Parameters:

result - is a list of result nodes per stream

result

public void result(EventBean[] row,
                   int fromStreamNum,
                   EventBean myEvent,
                   Node myNode,
                   java.util.Collection<EventBean[]> resultFinalRows,
                   EventBean resultRootEvent)

Description copied from interface: ResultAssembler

Publish a result row.

Parameters:

row - is the result to publish

fromStreamNum - is the originitor that publishes the row

myEvent - is optional and is the event that led to the row result

myNode - is optional and is the result node of the event that led to the row result

resultFinalRows - is the final result rows

print

public void print(IndentWriter indentWriter)

Description copied from class: BaseAssemblyNode

Output this node using writer, not outputting child nodes.

Specified by:

print in class BaseAssemblyNode

Parameters:

indentWriter - to use for output

computeCombined

protected static int[][] computeCombined(int[][] subStreamsPerChild)

Compute an array of supersets of sub stream numbers per stream, for at least 3 or more streams.

Parameters:

subStreamsPerChild - is for each stream number a list of direct child sub streams

Returns:

an array in with length (subStreamsPerChild.lenght - 2) in which array[0] contains the streams for subStreamsPerChild[0] and subStreamsPerChild[1] combined, and array[1] contains the streams for subStreamsPerChild[0], subStreamsPerChild[1] and subStreamsPerChild[2] combined