photocomparator.java

来自「手机在线系统 采用Java 中的J2ME, JSP 跟MySql 运行环」· Java 代码 · 共 81 行

/**
 * @(#)PhotoComparator.java	
 * Copyright (c) 2004-2005 wuhua of workroom Inc. All Rights Reserved.
 * @version 	1.0, 10/05/2004
 * @author 	饶荣庆
 * @author 	
 */
package com.j2me.myphoto;

import javax.microedition.rms.*;

/**
 *此类实现相片排序功能
 */
public class PhotoComparator implements RecordComparator
{
	private int compareType = 0;  //定义搜索类型
	private String compareName;
	private int compareID;
	private int id;
	private String name;

	public PhotoComparator(int _compareType)  
	{
		this.compareType = _compareType;
	}

	public int compare(byte[] b1, byte[] b2)
	{
		ByteArrayToRecord batr1 = new ByteArrayToRecord(b1);   
		ByteArrayToRecord batr2 = new ByteArrayToRecord(b2);
		String _name1, _path1;
		String _name2, _path2;
		int _id1, _id2;

		_id1 = batr1.getID();
		_name1 = batr1.getName();
		_path1 = batr1.getPath();

		_id2 = batr2.getID();
		_name2 = batr2.getName();
		_path2 = batr2.getPath();
		// compareType为0表示按name排序
		if (compareType == 0)
		{
			if (_name1.compareTo(_name2) == 0)
			{
				return RecordComparator.EQUIVALENT;
			}
			else if (_name1.compareTo(_name2) < 0)
			{
				return RecordComparator.PRECEDES;
			}
			else
			{
				return RecordComparator.FOLLOWS;
			}
		}
		else
		{
			if (_id1 == _id2)
			{
				return RecordComparator.EQUIVALENT;
			}
			else if (_id1 < _id2)
			{
				return RecordComparator.PRECEDES;
			}
			else
			{
				return RecordComparator.FOLLOWS;
			}
		}
	}
}