com.espertech.esper.pattern.guard
Class ExpressionGuardFactory

java.lang.Object
  com.espertech.esper.pattern.guard.ExpressionGuardFactory

All Implemented Interfaces:

GuardFactory, MetaDefItem, java.io.Serializable

public class ExpressionGuardFactory
extends java.lang.Object
implements GuardFactory, MetaDefItem, java.io.Serializable

Factory for TimerWithinGuard instances.

See Also:

Serialized Form

Field Summary

protected MatchedEventConvertor	convertor For converting matched-events maps to events-per-stream.
protected ExprNode	expression

Constructor Summary

ExpressionGuardFactory()

Method Summary

Guard	makeGuard(PatternAgentInstanceContext context, MatchedEventMap beginState, Quitable quitable, EvalStateNodeNumber stateNodeId, java.lang.Object guardState) Constructs a guard instance.
void	setGuardParameters(java.util.List<ExprNode> parameters, MatchedEventConvertor convertor) Sets the guard object parameters.

Methods inherited from class java.lang.Object

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

Field Detail

expression

protected ExprNode expression

convertor

protected transient MatchedEventConvertor convertor

For converting matched-events maps to events-per-stream.

Constructor Detail

ExpressionGuardFactory

public ExpressionGuardFactory()

Method Detail

setGuardParameters

public void setGuardParameters(java.util.List<ExprNode> parameters,
                               MatchedEventConvertor convertor)
                        throws GuardParameterException

Description copied from interface: GuardFactory

Sets the guard object parameters.

Specified by:

setGuardParameters in interface GuardFactory

Parameters:

parameters - is a list of parameters

convertor - for converting a

Throws:

GuardParameterException - thrown to indicate a parameter problem

makeGuard

public Guard makeGuard(PatternAgentInstanceContext context,
                       MatchedEventMap beginState,
                       Quitable quitable,
                       EvalStateNodeNumber stateNodeId,
                       java.lang.Object guardState)

Description copied from interface: GuardFactory

Constructs a guard instance.

Specified by:

makeGuard in interface GuardFactory

Parameters:

context - - services for use by guard

beginState - - the prior matching events

quitable - - to use for indicating the guard has quit

stateNodeId - - a node id for the state object

guardState - - state node for guard

Returns:

guard instance