org.eclipse.incquery.runtime.rete.index

Class CountNode

java.lang.Object

org.eclipse.incquery.runtime.rete.network.BaseNode

org.eclipse.incquery.runtime.rete.network.StandardNode

org.eclipse.incquery.runtime.rete.index.AggregatorNode

org.eclipse.incquery.runtime.rete.index.CountNode

All Implemented Interfaces:

Node, Supplier

public class CountNode
extends AggregatorNode

An aggregation node that simply counts the number of tuples conforming to the signature.

Author:

Gabor Bergmann

Constructor Summary

Constructors

Constructor and Description
CountNode(ReteContainer reteContainer)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	aggregateGroup(Tuple signature, java.util.Collection<Tuple> group) Aggregates (reduces) a group of tuples.

Methods inherited from class org.eclipse.incquery.runtime.rete.index.AggregatorNode

aggregateGroupAfterUpdate, assignTraceInfo, getAggregatorOuterIdentityIndexer, getAggregatorOuterIndexer, initializeWith, pullInto

Methods inherited from class org.eclipse.incquery.runtime.rete.network.StandardNode

appendChild, constructIndex, getPulledContents, getReceivers, removeChild

Methods inherited from class org.eclipse.incquery.runtime.rete.network.BaseNode

acceptPropagatedTraceInfo, getContainer, getNodeId, getTag, getTraceInfos, setTag, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.incquery.runtime.rete.network.Node

acceptPropagatedTraceInfo, getContainer, getNodeId, getTag, getTraceInfos, setTag

Constructor Detail

CountNode

public CountNode(ReteContainer reteContainer)

Method Detail

aggregateGroup

public java.lang.Object aggregateGroup(Tuple signature,
                                       java.util.Collection<Tuple> group)

Description copied from class: AggregatorNode

Aggregates (reduces) a group of tuples. The group can be null.

Specified by:

aggregateGroup in class AggregatorNode