/**
 * Alipay.com Inc.
 * Copyright (c) 2004-2012 All Rights Reserved.
 */
package com.alipay.zdal.client.jdbc.resultset;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import com.alipay.zdal.client.jdbc.ZdalStatement;

/**
 * 
 * @author ����
 * @version $Id: SimpleTResultSet.java, v 0.1 2014-1-6 ����05:15:00 Exp $
 */
public class SimpleTResultSet extends BaseTResultSet {

    private boolean inited;

    public SimpleTResultSet(ZdalStatement statementProxy, List<ResultSet> resultSets) {
        super(statementProxy, resultSets);
    }

    @Override
    protected boolean internNext() throws SQLException {
        if (!inited) {
            inited = true;
            reducer();
        }
        for (int i = currentIndex; i < actualResultSets.size(); ++i) {
            if (actualResultSets.get(i).next()) {
                currentIndex = i;
                limitTo--;
                return true;
            }
        }

        return false;
    }

    protected ResultSet reducer() throws SQLException {
        if (actualResultSets.size() == 0) {
            throw new RuntimeException("This should not happen!!");
        }
        if (actualResultSets.size() == 1) {
            return actualResultSets.get(0);
        }
        for (int i = 0; i < limitFrom; i++) {
            next();
        }
        return null;
    }

}