/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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;
import com.espertech.esper.epl.declexpr.ExprDeclaredNode;
import java.util.ArrayList;
import java.util.List;
/**
* Visitor that collects {@link ExprSubselectNode} instances.
*/
public class ExprNodeSubselectDeclaredDotVisitor implements ExprNodeVisitorWithParent
{
private final List<ExprSubselectNode> subselects;
private final List<ExprDotNode> chainedExpressionsDot;
private final List<ExprDeclaredNode> declaredExpressions;
/**
* Ctor.
*/
public ExprNodeSubselectDeclaredDotVisitor()
{
subselects = new ArrayList<ExprSubselectNode>(1);
chainedExpressionsDot = new ArrayList<ExprDotNode>(1);
declaredExpressions = new ArrayList<ExprDeclaredNode>(1);
}
public void reset() {
subselects.clear();
chainedExpressionsDot.clear();
declaredExpressions.clear();
}
/**
* Returns a list of lookup expression nodes.
* @return lookup nodes
*/
public List<ExprSubselectNode> getSubselects() {
return subselects;
}
public List<ExprDotNode> getChainedExpressionsDot() {
return chainedExpressionsDot;
}
public List<ExprDeclaredNode> getDeclaredExpressions() {
return declaredExpressions;
}
public boolean isVisit(ExprNode exprNode)
{
return true;
}
public void visit(ExprNode exprNode, ExprNode parentExprNode) {
if (exprNode instanceof ExprDotNode)
{
chainedExpressionsDot.add((ExprDotNode) exprNode);
}
if (exprNode instanceof ExprDeclaredNode)
{
declaredExpressions.add((ExprDeclaredNode) exprNode);
}
if (!(exprNode instanceof ExprSubselectNode))
{
return;
}
ExprSubselectNode subselectNode = (ExprSubselectNode) exprNode;
subselects.add(subselectNode);
}
}