/*
***************************************************************************************
* 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.declexpr.ExprDeclaredNode;
import com.espertech.esper.epl.expression.core.ExprNode;
import com.espertech.esper.epl.expression.dot.ExprDotNode;
import com.espertech.esper.epl.expression.subquery.ExprSubselectNode;
import java.util.ArrayList;
import java.util.List;
/**
* Visitor that collects {@link com.espertech.esper.epl.expression.subquery.ExprSubselectNode} instances.
*/
public class ExprNodeSubselectDeclaredDotVisitor implements ExprNodeVisitor {
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) {
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);
}
}