org.eclipse.incquery.runtime.rete.index

Class NullIndexer

java.lang.Object

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

org.eclipse.incquery.runtime.rete.index.StandardIndexer

org.eclipse.incquery.runtime.rete.index.SpecializedProjectionIndexer

org.eclipse.incquery.runtime.rete.index.NullIndexer

All Implemented Interfaces:

java.lang.Iterable<Tuple>, Indexer, IterableIndexer, ProjectionIndexer, Node

Direct Known Subclasses:

MemoryNullIndexer

public abstract class NullIndexer
extends SpecializedProjectionIndexer

Defines an abstract trivial indexer that projects the contents of some stateful node to the empty tuple, and can therefore save space. Can only exist in connection with a stateful store, and must be operated by another node (the active node). Do not attach parents directly!

Author:

Gabor Bergmann

Constructor Summary

Constructors

Constructor and Description
NullIndexer(ReteContainer reteContainer, int tupleWidth, Supplier parent, Node activeNode)

Method Summary

Modifier and Type	Method and Description
java.util.Collection<Tuple>	get(Tuple signature)
java.util.Collection<Tuple>	getSignatures() A collection consisting of exactly those signatures whose tuple group is not empty CONTRACT: do not modify
java.util.Iterator<Tuple>	iterator()
void	propagate(Direction direction, Tuple updateElement)

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

getActiveNode

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

assignTraceInfo, attachListener, detachListener, getContainer, getListeners, getMask, getParent

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

acceptPropagatedTraceInfo, 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.index.Indexer

attachListener, detachListener, getListeners, getMask, getParent

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

acceptPropagatedTraceInfo, assignTraceInfo, getContainer, getNodeId, getTag, getTraceInfos, setTag

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

NullIndexer

public NullIndexer(ReteContainer reteContainer,
                   int tupleWidth,
                   Supplier parent,
                   Node activeNode)

Method Detail

get

public java.util.Collection<Tuple> get(Tuple signature)

Returns:

all stored tuples that conform to the specified signature, null if there are none such. CONTRACT: do not modify!

getSignatures

public java.util.Collection<Tuple> getSignatures()

Description copied from interface: IterableIndexer

A collection consisting of exactly those signatures whose tuple group is not empty CONTRACT: do not modify

iterator

public java.util.Iterator<Tuple> iterator()

propagate

public void propagate(Direction direction,
                      Tuple updateElement)