com.tinkerpop.pipes.sideeffect

Class GroupCountPipe<S>

java.lang.Object

com.tinkerpop.pipes.AbstractPipe<S,S>

com.tinkerpop.pipes.sideeffect.GroupCountPipe<S>

All Implemented Interfaces:

Pipe<S,S>, SideEffectPipe<S,Map<S,Number>>, SideEffectPipe.GreedySideEffectPipe<S,Map<S,Number>>, Iterable<S>, Iterator<S>

public class GroupCountPipe<S>
extends AbstractPipe<S,S>
implements SideEffectPipe.GreedySideEffectPipe<S,Map<S,Number>>

The GroupCountPipe will simply emit the incoming object, but generate a map side effect. The map's keys are the objects that come into the pipe. The map's values are the number of times that the key object has come into the pipe.

Author:

Marko A. Rodriguez (http://markorodriguez.com)

Nested Class Summary

Nested classes/interfaces inherited from interface com.tinkerpop.pipes.sideeffect.SideEffectPipe

SideEffectPipe.GreedySideEffectPipe<S,T>, SideEffectPipe.LazySideEffectPipe<S,T>

Field Summary

Fields inherited from class com.tinkerpop.pipes.AbstractPipe

currentEnd, pathEnabled, starts

Fields inherited from interface com.tinkerpop.pipes.Pipe

NO_PATH_MESSAGE

Constructor Summary

Constructors

Constructor and Description
GroupCountPipe()
GroupCountPipe(Map<S,Number> countMap)

Method Summary

Methods

Modifier and Type	Method and Description
Map<S,Number>	getSideEffect()
protected S	processNextStart()
void	reset() A pipe may maintain state.

Methods inherited from class com.tinkerpop.pipes.AbstractPipe

enablePath, getCurrentPath, getPathToHere, hasNext, iterator, next, remove, setStarts, setStarts, setStarts, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.tinkerpop.pipes.Pipe

enablePath, getCurrentPath, setStarts, setStarts

Methods inherited from interface java.util.Iterator

hasNext, next, remove

Methods inherited from interface java.lang.Iterable

iterator

Constructor Detail

GroupCountPipe

public GroupCountPipe(Map<S,Number> countMap)

GroupCountPipe

public GroupCountPipe()

Method Detail

processNextStart

protected S processNextStart()

Specified by:

processNextStart in class AbstractPipe<S,S>

getSideEffect

public Map<S,Number> getSideEffect()

Specified by:

getSideEffect in interface SideEffectPipe<S,Map<S,Number>>

reset

public void reset()

Description copied from interface: Pipe

A pipe may maintain state. Reset is used to remove state. The general use case for reset() is to reuse a pipe in another computation without having to create a new Pipe object. An implementation of this method should be recursive whereby the starts (if a Pipe) should have this method called on it.

Specified by:

reset in interface Pipe<S,S>

Overrides:

reset in class AbstractPipe<S,S>