Class NullIndexer

java.lang.Object

tools.refinery.interpreter.rete.network.BaseNode

tools.refinery.interpreter.rete.index.StandardIndexer

tools.refinery.interpreter.rete.index.SpecializedProjectionIndexer

tools.refinery.interpreter.rete.index.NullIndexer

All Implemented Interfaces:

Iterable<Tuple>, Indexer, IterableIndexer, ProjectionIndexer, NetworkStructureChangeSensitiveNode, Node

Direct Known Subclasses:

MemoryNullIndexer, TimelyMemoryNullIndexer

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!

Nested Class Summary

Nested classes/interfaces inherited from class SpecializedProjectionIndexer

SpecializedProjectionIndexer.ListenerSubscription

Field Summary

Fields

Modifier and Type	Field	Description
protected static final Collection<Tuple>	emptySet
protected static final Tuple	nullSignature
protected static final Collection<Tuple>	nullSingleton

Fields inherited from class SpecializedProjectionIndexer

activeNode, subscriptions

Fields inherited from class StandardIndexer

mask, parent

Fields inherited from class BaseNode

nodeId, reteContainer, tag, traceInfos

Constructor Summary

Constructors

Constructor	Description
NullIndexer(ReteContainer reteContainer, int tupleWidth, Supplier parent, Node activeNode, List<SpecializedProjectionIndexer.ListenerSubscription> sharedSubscriptionList)

Method Summary

Modifier and Type	Method	Description
Collection<Tuple>	get(Tuple signature)
int	getBucketCount()
Collection<Tuple>	getSignatures()	A view consisting of exactly those signatures whose tuple group is not empty
protected abstract Collection<Tuple>	getTuples()
protected boolean	isEmpty()
protected boolean	isSingleElement()
Iterator<Tuple>	iterator()
void	propagateToListener(IndexerListener listener, Direction direction, Tuple updateElement, Timestamp timestamp)

Methods inherited from class SpecializedProjectionIndexer

attachListener, detachListener, getActiveNode, getSubscriptions, networkStructureChanged, propagate

Methods inherited from class StandardIndexer

assignTraceInfo, getContainer, getListeners, getMask, getParent, toStringCore

Methods inherited from class BaseNode

acceptPropagatedTraceInfo, getNodeId, getTag, getTraceInfoPatternsEnumerated, getTraceInfos, setTag, toString

Methods inherited from class Object

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

Methods inherited from interface Indexer

getListeners, getMask, getParent, getTimeline

Methods inherited from interface Iterable

forEach, spliterator

Methods inherited from interface Node

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

Field Details

nullSignature

protected static final Tuple nullSignature

nullSingleton

protected static final Collection<Tuple> nullSingleton

emptySet

protected static final Collection<Tuple> emptySet

Constructor Details

NullIndexer

public NullIndexer(ReteContainer reteContainer,
 int tupleWidth,
 Supplier parent,
 Node activeNode,
 List<SpecializedProjectionIndexer.ListenerSubscription> sharedSubscriptionList)

Method Details

getTuples

protected abstract Collection<Tuple> getTuples()

get

public 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 Collection<Tuple> getSignatures()

Description copied from interface: IterableIndexer

A view consisting of exactly those signatures whose tuple group is not empty

isEmpty

protected boolean isEmpty()

isSingleElement

protected boolean isSingleElement()

iterator

public Iterator<Tuple> iterator()

getBucketCount

public int getBucketCount()

Returns:

the number of signatures whose tuple group is not empty

propagateToListener

public void propagateToListener(IndexerListener listener,
 Direction direction,
 Tuple updateElement,
 Timestamp timestamp)

Specified by:

propagateToListener in class SpecializedProjectionIndexer