/*
***************************************************************************************
* 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.epl.expression.visitor;
import com.espertech.esper.epl.expression.core.ExprNode;
/**
* Visitor interface for use with expression node trees, receives both the child node and the parent node (or null to indicate no parent node).
*/
public interface ExprNodeVisitorWithParent {
/**
* Allows visitor to indicate whether to visit a given node.
* Implicitly if a visitor doesn't visit a node it would also not visit any descendent child nodes of that node.
*
* @param exprNode is the node in questions
* @return true if the visitor wants to visit the child node (next call is visit), or false to skip child
*/
public boolean isVisit(ExprNode exprNode);
/**
* Visit the given expression node.
*
* @param exprNode is the expression node to visit
* @param parentExprNode parent to visit
*/
public void visit(ExprNode exprNode, ExprNode parentExprNode);
}