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Complex event processing and event series analysis component

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/**************************************************************************************
 * Copyright (C) 2006-2015 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;
import com.espertech.esper.epl.expression.core.ExprStreamRefNode;

import java.util.ArrayList;
import java.util.List;

public class ExprNodeStreamUseCollectVisitor implements ExprNodeVisitor
{
    private final List referenced = new ArrayList();

    public boolean isVisit(ExprNode exprNode) {
        return true;
    }

    public List getReferenced() {
        return referenced;
    }

    public void visit(ExprNode exprNode) {
        if (!(exprNode instanceof ExprStreamRefNode)) {
            return;
        }
        referenced.add((ExprStreamRefNode) exprNode);
    }
}