com.espertech.esper.pattern

Class EvalFilterStateNode

java.lang.Object

com.espertech.esper.pattern.EvalStateNode

com.espertech.esper.pattern.EvalFilterStateNode

All Implemented Interfaces:

FilterHandle, FilterHandleCallback

Direct Known Subclasses:

EvalFilterStateNodeConsumeImpl

public class EvalFilterStateNode
extends EvalStateNode
implements FilterHandleCallback

This class contains the state of a single filter expression in the evaluation state tree.

Field Summary

Fields

Modifier and Type	Field and Description
protected MatchedEventMap	beginState
protected EvalFilterNode	evalFilterNode
protected FilterServiceEntry	filterServiceEntry
protected EPStatementHandleCallback	handle
protected boolean	isStarted

Constructor Summary

Constructors

Constructor and Description
EvalFilterStateNode(Evaluator parentNode, EvalFilterNode evalFilterNode) Constructor.

Method Summary

Modifier and Type	Method and Description
void	accept(EvalStateNodeVisitor visitor) Accept a visitor.
EvalFilterNode	getEvalFilterNode()
EvalNode	getFactoryNode() Returns the factory node for the state node.
int	getStatementId() Returns the statement id.
boolean	isFilterStateNode()
boolean	isNotOperator()
boolean	isObserverStateNodeNonRestarting()
boolean	isSubSelect() Returns true if the filter applies to subselects.
void	matchFound(EventBean theEvent, Collection<FilterHandleCallback> allStmtMatches) Indicate that an event was evaluated by the FilterService which matches the filter specification FilterSpecCompiled associated with this callback.
void	quit() Stops the event expression or an instance of it.
void	removeMatch(Set<EventBean> matchEvent) Remove matches that overlap with the provided events.
void	start(MatchedEventMap beginState) Starts the event expression or an instance of it.
protected void	startFiltering()
String	toString()

Methods inherited from class com.espertech.esper.pattern.EvalStateNode

getParentEvaluator, setParentEvaluator

Methods inherited from class java.lang.Object

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

Field Detail

evalFilterNode

protected final EvalFilterNode evalFilterNode

isStarted

protected boolean isStarted

handle

protected EPStatementHandleCallback handle

filterServiceEntry

protected FilterServiceEntry filterServiceEntry

beginState

protected MatchedEventMap beginState

Constructor Detail

EvalFilterStateNode

public EvalFilterStateNode(Evaluator parentNode,
                           EvalFilterNode evalFilterNode)

Constructor.

Parameters:

parentNode - is the parent evaluator to call to indicate truth value

evalFilterNode - is the factory node associated to the state

Method Detail

getFactoryNode

public EvalNode getFactoryNode()

Description copied from class: EvalStateNode

Returns the factory node for the state node.

Specified by:

getFactoryNode in class EvalStateNode

Returns:

factory node

getStatementId

public int getStatementId()

Description copied from interface: FilterHandle

Returns the statement id.

Specified by:

getStatementId in interface FilterHandle

Returns:

statement id

start

public final void start(MatchedEventMap beginState)

Description copied from class: EvalStateNode

Starts the event expression or an instance of it. Child classes are expected to initialize and start any event listeners or schedule any time-based callbacks as needed.

Specified by:

start in class EvalStateNode

Parameters:

beginState - begin state

quit

public final void quit()

Description copied from class: EvalStateNode

Stops the event expression or an instance of it. Child classes are expected to free resources and stop any event listeners or remove any time-based callbacks.

Specified by:

quit in class EvalStateNode

getEvalFilterNode

public EvalFilterNode getEvalFilterNode()

matchFound

public void matchFound(EventBean theEvent,
                       Collection<FilterHandleCallback> allStmtMatches)

Description copied from interface: FilterHandleCallback

Indicate that an event was evaluated by the FilterService which matches the filter specification FilterSpecCompiled associated with this callback.

Specified by:

matchFound in interface FilterHandleCallback

Parameters:

theEvent - - the event received that matches the filter specification

allStmtMatches - - collection of matches that represent all matches for the same statement

accept

public final void accept(EvalStateNodeVisitor visitor)

Description copied from class: EvalStateNode

Accept a visitor. Child classes are expected to invoke the visit method on the visitor instance passed in.

Specified by:

accept in class EvalStateNode

Parameters:

visitor - on which the visit method is invoked by each node

isSubSelect

public boolean isSubSelect()

Description copied from interface: FilterHandleCallback

Returns true if the filter applies to subselects.

Specified by:

isSubSelect in interface FilterHandleCallback

Returns:

subselect filter

toString

public final String toString()

Overrides:

toString in class Object

isFilterStateNode

public boolean isFilterStateNode()

Specified by:

isFilterStateNode in class EvalStateNode

isNotOperator

public boolean isNotOperator()

Specified by:

isNotOperator in class EvalStateNode

isObserverStateNodeNonRestarting

public boolean isObserverStateNodeNonRestarting()

Specified by:

isObserverStateNodeNonRestarting in class EvalStateNode

removeMatch

public void removeMatch(Set<EventBean> matchEvent)

Description copied from class: EvalStateNode

Remove matches that overlap with the provided events.

Specified by:

removeMatch in class EvalStateNode

Parameters:

matchEvent - set of events to check for

startFiltering

protected void startFiltering()