org.drools.core.reteoo

Class AlphaNode

java.lang.Object

org.drools.core.common.BaseNode

org.drools.core.reteoo.ObjectSource

org.drools.core.reteoo.AlphaNode

All Implemented Interfaces:

Externalizable, Serializable, NetworkNode, ObjectSink, ObjectSinkNode, Sink

Direct Known Subclasses:

MethodCountingAlphaNode

public class AlphaNode
extends ObjectSource
implements ObjectSinkNode

AlphaNodes are nodes in the Rete network used to apply FieldConstraint<.code>s on asserted fact objects where the FieldConstraints have no dependencies on any other of the facts in the current Rule.

See Also:

AlphaNodeFieldConstraint, Serialized Form

Field Summary

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

alphaNodeHashingThreshold, declaredMask, inferredMask, sink, source

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

associations, hashcode, id, memoryId, partitionId, partitionsEnabled

Constructor Summary

Constructors

Constructor and Description
AlphaNode()
AlphaNode(int id, AlphaNodeFieldConstraint constraint, ObjectSource objectSource, BuildContext context) Construct an AlphaNode with a unique id using the provided FieldConstraint and the given ObjectSource.

Method Summary

Modifier and Type	Method and Description
void	assertObject(InternalFactHandle factHandle, PropagationContext context, InternalWorkingMemory workingMemory)
void	attach(BuildContext context) Attaches the node into the network.
void	byPassModifyToBetaNode(InternalFactHandle factHandle, ModifyPreviousTuples modifyPreviousTuples, PropagationContext context, InternalWorkingMemory workingMemory)
BitMask	calculateDeclaredMask(Class modifiedClass, List<String> settableProperties)
boolean	equals(Object object)
AlphaNodeFieldConstraint	getConstraint() Retruns the FieldConstraint
BitMask	getDeclaredMask()
BitMask	getInferredMask()
ObjectSinkNode	getNextObjectSinkNode() Returns the next node
ObjectSinkNode	getPreviousObjectSinkNode() Returns the previous node
short	getType()
protected boolean	internalEquals(Object object)
void	modifyObject(InternalFactHandle factHandle, ModifyPreviousTuples modifyPreviousTuples, PropagationContext context, InternalWorkingMemory workingMemory)
void	readExternal(ObjectInput in)
void	setNextObjectSinkNode(ObjectSinkNode next) Sets the next node
void	setPartitionId(BuildContext context, RuleBasePartitionId partitionId) Sets the partition this node belongs to
void	setPreviousObjectSinkNode(ObjectSinkNode previous) Sets the previous node
String	toString()
void	updateSink(ObjectSink sink, PropagationContext context, InternalWorkingMemory workingMemory)
void	writeExternal(ObjectOutput out)

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

addObjectSink, doRemove, getKnowledgeBase, getObjectSinkPropagator, getObjectTypeNode, getParentObjectSource, initDeclaredMask, isInUse, networkUpdated, removeObjectSink, resetInferredMask, setObjectSinkPropagator, setParentObjectSource, setPartitionIdWithSinks, setSourcePartitionId, updateMask

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.ObjectSinkNode

setPartitionIdWithSinks

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

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

Constructor Detail

AlphaNode

public AlphaNode()

AlphaNode

public AlphaNode(int id,
                 AlphaNodeFieldConstraint constraint,
                 ObjectSource objectSource,
                 BuildContext context)

Construct an AlphaNode with a unique id using the provided FieldConstraint and the given ObjectSource. Set the boolean flag to true if the node is supposed to have local memory, or false otherwise. Memory is optional for AlphaNodes and is only of benefic when adding additional Rules at runtime.

Parameters:

id - Node's ID

constraint - Node's constraints

objectSource - Node's object source

Method Detail

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class ObjectSource

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class ObjectSource

Throws:

IOException

getConstraint

public AlphaNodeFieldConstraint getConstraint()

Retruns the FieldConstraint

Returns:

FieldConstraint

getType

public short getType()

Specified by:

getType in interface NetworkNode

attach

public void attach(BuildContext context)

Description copied from class: BaseNode

Attaches the node into the network. Usually to the parent ObjectSource or TupleSource

Specified by:

attach in class BaseNode

setPartitionId

public void setPartitionId(BuildContext context,
                           RuleBasePartitionId partitionId)

Description copied from class: BaseNode

Sets the partition this node belongs to

Overrides:

setPartitionId in class ObjectSource

assertObject

public void assertObject(InternalFactHandle factHandle,
                         PropagationContext context,
                         InternalWorkingMemory workingMemory)

Specified by:

assertObject in interface ObjectSink

modifyObject

public void modifyObject(InternalFactHandle factHandle,
                         ModifyPreviousTuples modifyPreviousTuples,
                         PropagationContext context,
                         InternalWorkingMemory workingMemory)

Specified by:

modifyObject in interface ObjectSink

byPassModifyToBetaNode

public void byPassModifyToBetaNode(InternalFactHandle factHandle,
                                   ModifyPreviousTuples modifyPreviousTuples,
                                   PropagationContext context,
                                   InternalWorkingMemory workingMemory)

Specified by:

byPassModifyToBetaNode in interface ObjectSink

updateSink

public void updateSink(ObjectSink sink,
                       PropagationContext context,
                       InternalWorkingMemory workingMemory)

Specified by:

updateSink in class ObjectSource

toString

public String toString()

Overrides:

toString in class BaseNode

equals

public boolean equals(Object object)

Overrides:

equals in class Object

internalEquals

protected boolean internalEquals(Object object)

Specified by:

internalEquals in class BaseNode

getNextObjectSinkNode

public ObjectSinkNode getNextObjectSinkNode()

Returns the next node

Specified by:

getNextObjectSinkNode in interface ObjectSinkNode

Returns:

The next ObjectSinkNode

setNextObjectSinkNode

public void setNextObjectSinkNode(ObjectSinkNode next)

Sets the next node

Specified by:

setNextObjectSinkNode in interface ObjectSinkNode

Parameters:

next - The next ObjectSinkNode

getPreviousObjectSinkNode

public ObjectSinkNode getPreviousObjectSinkNode()

Returns the previous node

Specified by:

getPreviousObjectSinkNode in interface ObjectSinkNode

Returns:

The previous ObjectSinkNode

setPreviousObjectSinkNode

public void setPreviousObjectSinkNode(ObjectSinkNode previous)

Sets the previous node

Specified by:

setPreviousObjectSinkNode in interface ObjectSinkNode

Parameters:

previous - The previous ObjectSinkNode

calculateDeclaredMask

public BitMask calculateDeclaredMask(Class modifiedClass,
                                     List<String> settableProperties)

Specified by:

calculateDeclaredMask in class ObjectSource

getDeclaredMask

public BitMask getDeclaredMask()

Overrides:

getDeclaredMask in class ObjectSource

getInferredMask

public BitMask getInferredMask()