Package org.drools.core.reteoo

Class ExistsNode

java.lang.Object

org.drools.core.common.BaseNode

org.drools.core.reteoo.LeftTupleSource

org.drools.core.reteoo.BetaNode

org.drools.core.reteoo.ExistsNode

All Implemented Interfaces:

Serializable, NetworkNode, MemoryFactory, LeftTupleNode, LeftTupleSink, LeftTupleSinkNode, ObjectSink, ObjectSinkNode, RightTupleSink, Sink

public class ExistsNode
extends BetaNode

ExistsNode extends BetaNode to perform tests for the existence of a Fact plus one or more conditions. Where existence is found the left ReteTuple is copied and propagated. Further to this it maintains the "truth" by canceling any Activations that are no longer considered true by the retraction of ReteTuple's or FactHandleImpl. Tuples are considered to be asserted from the left input and facts from the right input. The BetaNode provides the BetaMemory to store asserted ReteTuples and FactHandleImpls. Each fact handle is stored in the right memory.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.drools.core.reteoo.BetaNode

BetaNode.RightTupleSinkAdapter

Field Summary

Fields inherited from class org.drools.core.reteoo.BetaNode

constraints, indexedUnificationJoin, isLogTraceEnabled, log, objectMemory, rightInput, rightInputIsRiaNode, tupleMemoryEnabled

Fields inherited from class org.drools.core.reteoo.LeftTupleSource

leftDeclaredMask, leftInferredMask, leftInput, leftNegativeMask, sink

Fields inherited from class org.drools.core.common.BaseNode

associations, hashcode, id, memoryId, partitionId

Constructor Summary

Constructors

Constructor	Description
ExistsNode()
ExistsNode(int id, LeftTupleSource leftInput, ObjectSource rightInput, BetaConstraints joinNodeBinder, BuildContext context)

Method Summary

Modifier and Type	Method	Description
boolean	doRemove(RuleRemovalContext context, ReteooBuilder builder)	Removes the node from the network.
int	getType()
boolean	isLeftUpdateOptimizationAllowed()
void	modifyRightTuple(TupleImpl rightTuple, PropagationContext context, ReteEvaluator reteEvaluator)
void	retractRightTuple(TupleImpl rightTuple, PropagationContext pctx, ReteEvaluator reteEvaluator)
String	toString()

Methods inherited from class org.drools.core.reteoo.BetaNode

assertObject, byPassModifyToBetaNode, calculateHashCode, createMemory, createRightTuple, doAttach, doDeleteRightTuple, doUpdateRightTuple, equals, getBetaMemory, getBetaMemoryFromRightInput, getConstraints, getFirstLeftTuple, getFirstRightTuple, getFirstTuple, getLeftIterator, getNextLeftTupleSinkNode, getNextObjectSinkNode, getObjectTypeNode, getPreviousLeftTupleSinkNode, getPreviousObjectSinkNode, getRawConstraints, getRightDeclaredMask, getRightInferredMask, getRightInput, getRightInputOtnId, getRightIterator, getRightNegativeMask, getRules, getStartTuple, initDeclaredMask, initInferredMask, initInferredMask, isIndexedUnificationJoin, isLeftTupleMemoryEnabled, isObjectMemoryEnabled, isRightInputIsRiaNode, isRightInputPassive, modifyObject, networkUpdated, reorderRightTuple, setLeftListenedProperties, setNextLeftTupleSinkNode, setNextObjectSinkNode, setPartitionId, setPreviousLeftTupleSinkNode, setPreviousObjectSinkNode, setRightInput, setRightInputOtnId, unwrapRightInput

Methods inherited from class org.drools.core.reteoo.LeftTupleSource

addTupleSink, addTupleSink, addTupleSink, getFirstLeftTupleSinkIgnoreRemoving, getLeftDeclaredMask, getLeftInferredMask, getLeftInputOtnId, getLeftInputPattern, getLeftNegativeMask, getLeftTupleSource, getObjectCount, getObjectType, getObjectTypeForPropertyReactivity, getPathIndex, getSinkPropagator, initMasks, isInUse, removeTupleSink, setLeftInferredMask, setLeftInputOtnId, setLeftTupleSource, setNodeConstraintsPropertyReactiveMask, setObjectCount, setPartitionIdWithSinks, setSourcePartitionId, setSourcePartitionId

Methods inherited from class org.drools.core.common.BaseNode

addAssociatedTerminal, addAssociation, addAssociation, attach, getAssociatedRules, getAssociatedTerminalsSize, getAssociationsSize, getId, getMemoryId, getPartitionId, getSinks, hasAssociatedTerminal, hashCode, initMemoryId, isAssociatedWith, isStreamMode, remove, removeAssociatedTerminal, removeAssociation, setId, setStreamMode

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.drools.core.reteoo.LeftTupleNode

getLeftTupleSource, getObjectCount, getPathIndex, getSinkPropagator, setObjectCount

Methods inherited from interface org.drools.core.reteoo.LeftTupleSink

getLeftInferredMask, getLeftInputOtnId, setLeftInputOtnId, setPartitionIdWithSinks

Methods inherited from interface org.drools.core.common.MemoryFactory

getMemoryId

Methods inherited from interface org.drools.base.common.NetworkNode

addAssociatedTerminal, getAssociatedRules, getAssociatedTerminalsSize, getId, getPartitionId, getSinks, hasAssociatedTerminal, isAssociatedWith, removeAssociatedTerminal

Methods inherited from interface org.drools.core.reteoo.ObjectSinkNode

setPartitionIdWithSinks

Constructor Details

ExistsNode

public ExistsNode()

ExistsNode

public ExistsNode(int id,
 LeftTupleSource leftInput,
 ObjectSource rightInput,
 BetaConstraints joinNodeBinder,
 BuildContext context)

Method Details

toString

public String toString()

Overrides:

toString in class BetaNode

getType

public int getType()

Specified by:

getType in interface NetworkNode

Specified by:

getType in class LeftTupleSource

retractRightTuple

public void retractRightTuple(TupleImpl rightTuple,
 PropagationContext pctx,
 ReteEvaluator reteEvaluator)

modifyRightTuple

public void modifyRightTuple(TupleImpl rightTuple,
 PropagationContext context,
 ReteEvaluator reteEvaluator)

doRemove

public boolean doRemove(RuleRemovalContext context,
 ReteooBuilder builder)

Description copied from class: BaseNode

Removes the node from the network. Usually from the parent ObjectSource or TupleSource

Specified by:

doRemove in class BaseNode

isLeftUpdateOptimizationAllowed

public boolean isLeftUpdateOptimizationAllowed()