com.espertech.esper.pattern

Class EvalAndStateNode

java.lang.Object

com.espertech.esper.pattern.EvalStateNode

com.espertech.esper.pattern.EvalAndStateNode

All Implemented Interfaces:

Evaluator

public class EvalAndStateNode
extends EvalStateNode
implements Evaluator

This class represents the state of an "and" operator in the evaluation state tree.

Field Summary

Fields

Modifier and Type	Field and Description
protected EvalStateNode[]	activeChildNodes
protected EvalAndNode	evalAndNode
protected Object[]	eventsPerChild

Constructor Summary

Constructors

Constructor and Description
EvalAndStateNode(Evaluator parentNode, EvalAndNode evalAndNode) Constructor.

Method Summary

Modifier and Type	Method and Description
void	accept(EvalStateNodeVisitor visitor) Accept a visitor.
static void	addMatchEvent(Object[] eventsPerChild, int indexFrom, MatchedEventMap matchEvent)
void	evaluateFalse(EvalStateNode fromNode, boolean restartable) Indicate a change in truth value to false.
void	evaluateTrue(MatchedEventMap matchEvent, EvalStateNode fromNode, boolean isQuitted) Indicate a change in truth value to true.
protected static void	generateMatchEvents(ArrayList<List<MatchedEventMap>> eventList, int index, List<MatchedEventMap> result, MatchedEventMap matchEvent) For each combination of MatchedEventMap instance in all collections, add an entry to the list.
static List<MatchedEventMap>	generateMatchEvents(MatchedEventMap matchEvent, Object[] eventsPerChild, int indexFrom) Generate a list of matching event combinations constisting of the events per child that are passed in.
EvalNode	getFactoryNode() Returns the factory node for the state node.
boolean	isFilterChildNonQuitting()
boolean	isFilterStateNode()
boolean	isNotOperator()
boolean	isObserverStateNodeNonRestarting()
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.
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

evalAndNode

protected final EvalAndNode evalAndNode

activeChildNodes

protected final EvalStateNode[] activeChildNodes

eventsPerChild

protected Object[] eventsPerChild

Constructor Detail

EvalAndStateNode

public EvalAndStateNode(Evaluator parentNode,
                        EvalAndNode evalAndNode)

Constructor.

Parameters:

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

evalAndNode - is the factory node associated to the state

Method Detail

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

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

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

isFilterStateNode

public boolean isFilterStateNode()

Specified by:

isFilterStateNode in class EvalStateNode

isNotOperator

public boolean isNotOperator()

Specified by:

isNotOperator in class EvalStateNode

isFilterChildNonQuitting

public boolean isFilterChildNonQuitting()

Specified by:

isFilterChildNonQuitting in interface Evaluator

isObserverStateNodeNonRestarting

public boolean isObserverStateNodeNonRestarting()

Specified by:

isObserverStateNodeNonRestarting in class EvalStateNode

evaluateTrue

public final void evaluateTrue(MatchedEventMap matchEvent,
                               EvalStateNode fromNode,
                               boolean isQuitted)

Description copied from interface: Evaluator

Indicate a change in truth value to true.

Specified by:

evaluateTrue in interface Evaluator

Parameters:

matchEvent - is the container for events that caused the change in truth value

fromNode - is the node that indicates the change

isQuitted - is an indication of whether the node continues listenening or stops listening

evaluateFalse

public final void evaluateFalse(EvalStateNode fromNode,
                                boolean restartable)

Description copied from interface: Evaluator

Indicate a change in truth value to false.

Specified by:

evaluateFalse in interface Evaluator

Parameters:

fromNode - is the node that indicates the change

restartable - whether the evaluator can be restarted

generateMatchEvents

public static List<MatchedEventMap> generateMatchEvents(MatchedEventMap matchEvent,
                                                        Object[] eventsPerChild,
                                                        int indexFrom)

Generate a list of matching event combinations constisting of the events per child that are passed in.

Parameters:

matchEvent - can be populated with prior events that must be passed on

eventsPerChild - is the list of events for each child node to the "And" node.

indexFrom - from-index

Returns:

list of events populated with all possible combinations

generateMatchEvents

protected static void generateMatchEvents(ArrayList<List<MatchedEventMap>> eventList,
                                          int index,
                                          List<MatchedEventMap> result,
                                          MatchedEventMap matchEvent)

For each combination of MatchedEventMap instance in all collections, add an entry to the list. Recursive method.

Parameters:

eventList - is an array of lists containing MatchedEventMap instances to combine

index - is the current index into the array

result - is the resulting list of MatchedEventMap

matchEvent - is the start MatchedEventMap to generate from

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

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

toString

public final String toString()

Overrides:

toString in class Object

addMatchEvent

public static void addMatchEvent(Object[] eventsPerChild,
                                 int indexFrom,
                                 MatchedEventMap matchEvent)