Package org.drools.core.rule

Class SlidingLengthWindow

java.lang.Object

org.drools.core.rule.SlidingLengthWindow

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, Behavior, RuleComponent, BehaviorRuntime

public class SlidingLengthWindow
extends Object
implements Externalizable, BehaviorRuntime

A length window behavior implementation

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SlidingLengthWindow.SlidingLengthWindowContext	A Context object for length windows

Nested classes/interfaces inherited from interface org.drools.base.rule.Behavior

Behavior.BehaviorType

Field Summary

Fields

Modifier and Type	Field	Description
protected int	size

Constructor Summary

Constructors

Constructor	Description
SlidingLengthWindow()
SlidingLengthWindow(int size)

Method Summary

Modifier and Type	Method	Description
boolean	assertFact(Object context, FactHandle handle, PropagationContext pctx, ReteEvaluator reteEvaluator)	Makes the behavior aware of the new fact entering behavior's scope
BehaviorContext	createContext()	Creates the context object associated with this behavior.
void	expireFacts(Object context, PropagationContext pctx, ReteEvaluator reteEvaluator)	A callback method that allows behaviors to expire facts
long	getExpirationOffset()	Length windows don't change expiration offset, so always return -1
long	getSize()
Behavior.BehaviorType	getType()	Returns the type of the behavior
void	readExternal(ObjectInput in)
void	retractFact(Object context, FactHandle handle, PropagationContext pctx, ReteEvaluator reteEvaluator)	Removes a right tuple from the behavior's scope
void	setSize(int size)
String	toString()
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Field Details

size

protected int size

Constructor Details

SlidingLengthWindow

public SlidingLengthWindow()

SlidingLengthWindow

public SlidingLengthWindow(int size)

Parameters:

size -

Method Details

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

getType

public Behavior.BehaviorType getType()

Description copied from interface: BehaviorRuntime

Returns the type of the behavior

Specified by:

getType in interface Behavior

Specified by:

getType in interface BehaviorRuntime

getSize

public long getSize()

Returns:

the size

setSize

public void setSize(int size)

Parameters:

size - the size to set

createContext

public BehaviorContext createContext()

Description copied from interface: BehaviorRuntime

Creates the context object associated with this behavior. The object is given as a parameter in all behavior call backs.

Specified by:

createContext in interface BehaviorRuntime

assertFact

public boolean assertFact(Object context,
 FactHandle handle,
 PropagationContext pctx,
 ReteEvaluator reteEvaluator)

Description copied from interface: BehaviorRuntime

Makes the behavior aware of the new fact entering behavior's scope

Specified by:

assertFact in interface BehaviorRuntime

Parameters:

context - The behavior context object

handle - The new fact entering behavior's scope

Returns:

true if the propagation should continue, false otherwise. I.e., the behaviour has veto power over the fact propagation, and prevents the propagation to continue if returns false on this method.

retractFact

public void retractFact(Object context,
 FactHandle handle,
 PropagationContext pctx,
 ReteEvaluator reteEvaluator)

Description copied from interface: BehaviorRuntime

Removes a right tuple from the behavior's scope

Specified by:

retractFact in interface BehaviorRuntime

Parameters:

context - The behavior context object

handle - The fact leaving the behavior's scope

expireFacts

public void expireFacts(Object context,
 PropagationContext pctx,
 ReteEvaluator reteEvaluator)

Description copied from interface: BehaviorRuntime

A callback method that allows behaviors to expire facts

Specified by:

expireFacts in interface BehaviorRuntime

getExpirationOffset

public long getExpirationOffset()

Length windows don't change expiration offset, so always return -1

Specified by:

getExpirationOffset in interface Behavior

Specified by:

getExpirationOffset in interface BehaviorRuntime

Returns:

the expiration offset for this behavior or -1 if they don't have a time based expiration offset.

toString

public String toString()

Overrides:

toString in class Object