com.espertech.esper.pattern
Class EvalRootNode

java.lang.Object
  com.espertech.esper.pattern.EvalNodeBase
      com.espertech.esper.pattern.EvalRootNode

All Implemented Interfaces:

EvalNode, PatternStarter

public class EvalRootNode
extends EvalNodeBase
implements PatternStarter

This class is always the root node in the evaluation tree representing an event expression. It hold the handle to the EPStatement implementation for notifying when matches are found.

Field Summary

protected EvalNode	childNode
protected EvalRootFactoryNode	factoryNode

Constructor Summary

EvalRootNode(PatternAgentInstanceContext context, EvalRootFactoryNode factoryNode, EvalNode childNode)

Method Summary

EvalNode	getChildNode()
EvalRootFactoryNode	getFactoryNode()
EvalStateNode	newState(Evaluator parentNode, EvalStateNodeNumber stateNodeNumber, long stateNodeId) Create the evaluation state node containing the truth value state for each operator in an event expression.
EvalRootState	start(PatternMatchCallback callback, PatternContext context, boolean isRecoveringResilient) An event expression was started and supplies the callback to use when matching events appear.
EvalRootState	start(PatternMatchCallback callback, PatternContext context, MatchedEventMap beginState, boolean isRecoveringResilient)
protected EvalRootState	startInternal(PatternMatchCallback callback, PatternContext context, MatchedEventMap beginState, boolean isRecoveringResilient)

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

getContext

Methods inherited from class java.lang.Object

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

Field Detail

factoryNode

protected final EvalRootFactoryNode factoryNode

childNode

protected final EvalNode childNode

Constructor Detail

EvalRootNode

public EvalRootNode(PatternAgentInstanceContext context,
                    EvalRootFactoryNode factoryNode,
                    EvalNode childNode)

Method Detail

getChildNode

public EvalNode getChildNode()

getFactoryNode

public EvalRootFactoryNode getFactoryNode()

start

public EvalRootState start(PatternMatchCallback callback,
                           PatternContext context,
                           boolean isRecoveringResilient)

Description copied from interface: PatternStarter

An event expression was started and supplies the callback to use when matching events appear. Returns the callback to use to stop the event expression.

Specified by:

start in interface PatternStarter

Parameters:

callback - must be supplied to indicate what to call when the expression turns true

context - is the context for handles to services required for evaluation.

Returns:

a callback to stop the expression again

start

public EvalRootState start(PatternMatchCallback callback,
                           PatternContext context,
                           MatchedEventMap beginState,
                           boolean isRecoveringResilient)

startInternal

protected EvalRootState startInternal(PatternMatchCallback callback,
                                      PatternContext context,
                                      MatchedEventMap beginState,
                                      boolean isRecoveringResilient)

newState

public EvalStateNode newState(Evaluator parentNode,
                              EvalStateNodeNumber stateNodeNumber,
                              long stateNodeId)

Description copied from class: EvalNodeBase

Create the evaluation state node containing the truth value state for each operator in an event expression.

Specified by:

newState in interface EvalNode

Specified by:

newState in class EvalNodeBase

Parameters:

parentNode - is the parent evaluator node that this node indicates a change in truth value to

Returns:

state node containing the truth value state for the operator