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:

Externalizable, Serializable, MemoryFactory, NetworkNode, 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

Field Summary

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

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

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

leftInput, sink

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

associations, hashcode, id, memoryId, partitionId, partitionsEnabled

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
LeftTuple	createLeftTuple(InternalFactHandle factHandle, LeftTuple leftTuple, Sink sink)
LeftTuple	createLeftTuple(InternalFactHandle factHandle, Sink sink, boolean leftTupleMemoryEnabled)
LeftTuple	createLeftTuple(LeftTuple leftTuple, RightTuple rightTuple, LeftTuple currentLeftChild, LeftTuple currentRightChild, Sink sink, boolean leftTupleMemoryEnabled)
LeftTuple	createLeftTuple(LeftTuple leftTuple, RightTuple rightTuple, Sink sink)
LeftTuple	createLeftTuple(LeftTuple leftTuple, Sink sink, PropagationContext pctx, boolean leftTupleMemoryEnabled)
LeftTuple	createPeer(LeftTuple original)
boolean	doRemove(RuleRemovalContext context, ReteooBuilder builder, InternalWorkingMemory[] workingMemories) Removes the node from the network.
short	getType()
boolean	isLeftUpdateOptimizationAllowed()
void	modifyRightTuple(RightTuple rightTuple, PropagationContext context, InternalWorkingMemory workingMemory)
void	retractRightTuple(RightTuple rightTuple, PropagationContext pctx, InternalWorkingMemory workingMemory)
String	toString()

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

assertObject, attach, byPassModifyToBetaNode, calculateHashCode, createMemory, createRightTuple, doDeleteRightTuple, doUpdateRightTuple, dumpMemory, equals, getBetaMemory, getBetaMemoryFromRightInput, getConstraints, getFirstLeftTuple, getFirstRightTuple, getFirstTuple, getLeftIterator, getNextLeftTupleSinkNode, getNextObjectSinkNode, getObjectTypeNode, getPreviousLeftTupleSinkNode, getPreviousObjectSinkNode, getRawConstraints, getRightDeclaredMask, getRightInferredMask, getRightInput, getRightInputOtnId, getRightIterator, getRightIterator, getRightNegativeMask, getRules, initDeclaredMask, initInferredMask, initInferredMask, internalEquals, isIndexedUnificationJoin, isLeftTupleMemoryEnabled, isObjectMemoryEnabled, isRightInputIsRiaNode, isRightInputPassive, modifyObject, networkUpdated, readExternal, setConstraints, setLeftListenedProperties, setLeftTupleMemoryEnabled, setNextLeftTupleSinkNode, setNextObjectSinkNode, setPartitionId, setPreviousLeftTupleSinkNode, setPreviousObjectSinkNode, setRightDeclaredMask, setRightInput, setRightInputOtnId, setUnificationJoin, unwrapRightInput, writeExternal

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

addTupleSink, addTupleSink, addTupleSink, getLeftDeclaredMask, getLeftInferredMask, getLeftInputOtnId, getLeftInputPattern, getLeftNegativeMask, getLeftTupleSource, getObjectType, getObjectTypeForPropertyReactivity, getPositionInPath, getSinkPropagator, initMasks, isInUse, removeTupleSink, setLeftInferredMask, setLeftInputOtnId, setLeftTupleSource, setPartitionIdWithSinks, setSourcePartitionId, setSourcePartitionId

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

addAssociation, addAssociation, getAssociatedRules, getAssociatedRuleSize, getAssociationsSize, getAssociationsSize, getId, getMemoryId, getPartitionId, getSinks, hashCode, initMemoryId, isAssociatedWith, isStreamMode, remove, removeAssociation, setId, setPartitionsEnabled, setStreamMode, thisNodeEquals

Methods inherited from class java.lang.Object

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

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

getLeftInferredMask, getLeftInputOtnId, setLeftInputOtnId, setPartitionIdWithSinks

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

getLeftTupleSource, getPositionInPath, getSinkPropagator

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

setPartitionIdWithSinks

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

getAssociatedRuleSize, getAssociationsSize, getAssociationsSize, getId, getPartitionId, isAssociatedWith, thisNodeEquals

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

getMemoryId

Constructor Detail

ExistsNode

public ExistsNode()

ExistsNode

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

Method Detail

toString

public String toString()

Overrides:

toString in class BetaNode

getType

public short getType()

Specified by:

getType in interface NetworkNode

Specified by:

getType in class LeftTupleSource

createLeftTuple

public LeftTuple createLeftTuple(InternalFactHandle factHandle,
                                 Sink sink,
                                 boolean leftTupleMemoryEnabled)

createLeftTuple

public LeftTuple createLeftTuple(InternalFactHandle factHandle,
                                 LeftTuple leftTuple,
                                 Sink sink)

createLeftTuple

public LeftTuple createLeftTuple(LeftTuple leftTuple,
                                 Sink sink,
                                 PropagationContext pctx,
                                 boolean leftTupleMemoryEnabled)

createLeftTuple

public LeftTuple createLeftTuple(LeftTuple leftTuple,
                                 RightTuple rightTuple,
                                 Sink sink)

createLeftTuple

public LeftTuple createLeftTuple(LeftTuple leftTuple,
                                 RightTuple rightTuple,
                                 LeftTuple currentLeftChild,
                                 LeftTuple currentRightChild,
                                 Sink sink,
                                 boolean leftTupleMemoryEnabled)

createPeer

public LeftTuple createPeer(LeftTuple original)

Specified by:

createPeer in interface LeftTupleSink

Specified by:

createPeer in class LeftTupleSource

retractRightTuple

public void retractRightTuple(RightTuple rightTuple,
                              PropagationContext pctx,
                              InternalWorkingMemory workingMemory)

modifyRightTuple

public void modifyRightTuple(RightTuple rightTuple,
                             PropagationContext context,
                             InternalWorkingMemory workingMemory)

doRemove

public boolean doRemove(RuleRemovalContext context,
                        ReteooBuilder builder,
                        InternalWorkingMemory[] workingMemories)

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()