RangRowDataPacketSorter.java

/*
 * Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software;Designed and Developed mainly by many Chinese 
 * opensource volunteers. you can redistribute it and/or modify it under the 
 * terms of the GNU General Public License version 2 only, as published by the
 * Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Any questions about this component can be directed to it's project Web address 
 * https://code.google.com/p/opencloudb/.
 *
 */
package org.opencloudb.mpp;

import org.opencloudb.mpp.tmp.FastRowDataSorter;
import org.opencloudb.net.mysql.RowDataPacket;

public class RangRowDataPacketSorter extends FastRowDataSorter {

	public RangRowDataPacketSorter(OrderCol[] orderCols) {
		super(orderCols);
	}
	
	public boolean ascDesc(int byColumnIndex) {
		if (this.orderCols[byColumnIndex].orderType == OrderCol.COL_ORDER_TYPE_ASC) {// 升序
			return true;
		}
		return false;
	}
	
	public int compareRowData(RowDataPacket l, RowDataPacket r, int byColumnIndex) {
		byte[] left = l.fieldValues.get(this.orderCols[byColumnIndex].colMeta.colIndex);
		byte[] right = r.fieldValues.get(this.orderCols[byColumnIndex].colMeta.colIndex);
		
		return compareObject(left, right, this.orderCols[byColumnIndex]);
	}
}