org.drools.reteoo
Class AlphaNode

java.lang.Object
  org.drools.common.BaseNode
      org.drools.reteoo.ObjectSource
          org.drools.reteoo.AlphaNode

All Implemented Interfaces:

Externalizable, Serializable, NetworkNode, NodeMemory, ObjectSink, ObjectSinkNode, Sink

public class AlphaNode
extends ObjectSource
implements ObjectSinkNode, NodeMemory

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

Nested Class Summary

static class

AlphaNode.AlphaMemory

Field Summary

Fields inherited from class org.drools.reteoo.ObjectSource

sink, source

Fields inherited from class org.drools.common.BaseNode

associations, id, partitionId, partitionsEnabled

Constructor Summary

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

void	assertObject(InternalFactHandle factHandle, PropagationContext context, InternalWorkingMemory workingMemory)
void	attach() Attaches the node into the network.
void	attach(InternalWorkingMemory[] workingMemories)
Object	createMemory(RuleBaseConfiguration config) Creates a HashSet for the AlphaNode's memory.
boolean	equals(Object object)
AlphaNodeFieldConstraint	getConstraint() Retruns the FieldConstraint
ObjectSinkNode	getNextObjectSinkNode() Returns the next node
ObjectSinkNode	getPreviousObjectSinkNode() Returns the previous node
int	hashCode() The hashCode return is simply the unique id of the node.
void	modifyObject(InternalFactHandle factHandle, ModifyPreviousTuples modifyPreviousTuples, PropagationContext context, InternalWorkingMemory workingMemory)
void	readExternal(ObjectInput in)
void	setNextObjectSinkNode(ObjectSinkNode next) Sets the next node
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.reteoo.ObjectSource

addObjectSink, doRemove, getParentObjectSource, getSinkPropagator, isInUse, networkUpdated, removeObjectSink

Methods inherited from class org.drools.common.BaseNode

addAssociation, getAssociations, getId, getPartitionId, remove, removeAssociation, setPartitionId

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.drools.common.NetworkNode

getId, getPartitionId

Methods inherited from interface org.drools.common.NodeMemory

getId

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

attach

public void attach()

Description copied from class: BaseNode

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

Specified by:

attach in class BaseNode

attach

public void attach(InternalWorkingMemory[] workingMemories)

Specified by:

attach in class BaseNode

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

updateSink

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

Specified by:

updateSink in class ObjectSource

createMemory

public Object createMemory(RuleBaseConfiguration config)

Creates a HashSet for the AlphaNode's memory.

Specified by:

createMemory in interface NodeMemory

toString

public String toString()

Overrides:

toString in class BaseNode

hashCode

public int hashCode()

Description copied from class: BaseNode

The hashCode return is simply the unique id of the node. It is expected that base classes will also implement equals(Object object).

Overrides:

hashCode in class BaseNode

equals

public boolean equals(Object object)

Overrides:

equals in class Object

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