/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.pattern;
/**
* Superclass of all nodes in an evaluation tree representing an event pattern expression.
* Follows the Composite pattern. Child nodes do not carry references to parent nodes, the tree
* is unidirectional.
*/
public abstract class EvalNodeBase implements EvalNode {
private final PatternAgentInstanceContext context;
protected EvalNodeBase(PatternAgentInstanceContext context) {
this.context = context;
}
/**
* Create the evaluation state node containing the truth value state for each operator in an
* event expression.
*
* @param parentNode is the parent evaluator node that this node indicates a change in truth value to
* @param stateNodeNumber node number
* @param stateNodeId node id
* @return state node containing the truth value state for the operator
*/
public abstract EvalStateNode newState(Evaluator parentNode,
EvalStateNodeNumber stateNodeNumber,
long stateNodeId);
public final PatternAgentInstanceContext getContext() {
return context;
}
}