BusStationAsyncTaskLoader.java

package com.roboo.like.google.async;

import java.io.IOException;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import android.content.Context;
import android.text.TextUtils;

import com.roboo.like.google.models.BusStationItem;

public class BusStationAsyncTaskLoader extends BaseAsyncTaskLoader<LinkedList<BusStationItem>>
{
	public static final String BASE_URL = "http://www.szjt.gov.cn/apts/";
	public static final String URL = "http://www.szjt.gov.cn/apts/APTSLine.aspx?__VIEWSTATE=%2FwEPDwUJNDk3MjU2MjgyD2QWAmYPZBYCAgMPZBYCAgEPZBYCAgYPDxYCHgdWaXNpYmxlaGRkZLSbkOWJhbw7r9tBdPn33bPCSlJcKXww5ounfGoyhKl3&__EVENTVALIDATION=%2FwEWAwLeub7XBwL88Oh8AqX89aoK1GKT3VlKUTd%2FxyQgZexCetMuo%2Fi%2FLRDnisAyha1YxN0%3D&ctl00%24MainContent%24LineName=18&ctl00%24MainContent%24SearchLine=%E6%90%9C%E7%B4%A2";// 18
	private Context mContext;
	private String mBusLineUrl;

	public BusStationAsyncTaskLoader(Context context)
	{
		super(context);
		this.mContext = context;
	}

	public BusStationAsyncTaskLoader(Context context, String busLineUrl)
	{
		super(context);
		this.mBusLineUrl = busLineUrl;
		this.mContext = context;
	}

	public LinkedList<BusStationItem> loadInBackground()
	{
		LinkedList<BusStationItem> data = getBusStation();
		mEndTime = System.currentTimeMillis();
		if (mEndTime - mStartTime < THREAD_LEAST_DURATION_TIME)
		{
			try
			{
				Thread.sleep(THREAD_LEAST_DURATION_TIME);
			}
			catch (InterruptedException e)
			{
				e.printStackTrace();
			}
		}
		return data;
	}

	private LinkedList<BusStationItem> getBusStation()
	{
		LinkedList<BusStationItem> data = null;
		if (!TextUtils.isEmpty(mBusLineUrl))
		{
			try
			{
				Document document = Jsoup.connect(mBusLineUrl).get();
				Element element = document.getElementById("MainContent_DATA");
				element = element.getElementsByTag("tbody").get(0);
				Elements elements = element.getElementsByTag("tr");
				Elements tmpEleemnts = null;

				String stationUrl = null, busNo = null, busTo = null, busLicensePlate = null, busUpdateTime = null, busStopSpacing = null;
				if (!elements.isEmpty())
				{
					data = new LinkedList<BusStationItem>();
					for (Element e : elements)
					{
						BusStationItem item = new BusStationItem();
						tmpEleemnts = e.getElementsByTag("td");
						if (!tmpEleemnts.isEmpty() && tmpEleemnts.size() == 5)// size = 5
						{
							Elements aElemens = tmpEleemnts.get(0).getElementsByTag("a");
							if (!aElemens.isEmpty())
							{
								busNo = aElemens.get(0).text();
								stationUrl = BASE_URL + aElemens.get(0).attr("href");
							}
							busTo = tmpEleemnts.get(1).text();
							busLicensePlate = tmpEleemnts.get(2).text();
							busUpdateTime = tmpEleemnts.get(3).text();
							busStopSpacing = tmpEleemnts.get(4).text();
							item.busNo = busNo;
							item.busTo = busTo;
							item.stationUrl = stationUrl;
							item.busLicensePlate = busLicensePlate;
							item.busStopSpacing = busStopSpacing;
							item.busUpdateTime = busUpdateTime;
							if ("进站".equals(item.busStopSpacing))
							{
								data.addFirst(item);
							}
							else if (TextUtils.isDigitsOnly(item.busStopSpacing))
							{
								data.add(data.size(), item);
							}
							else
							{
								data.addLast(item);
							}
						}
					}
					if (data.size() == 0)
					{
						data = null;
					}
				}
			}
			catch (IOException e1)
			{
				e1.printStackTrace();
			}
			if (data != null)
			{
				mDebug = false;
				if (mDebug)
				{
					for (BusStationItem item : data)
					{
						System.out.println("item = " + item);
					}
				}
				Collections.sort(data, new BusStopSpacingComparator());
			}
		}
		return data;
	}

	/**
	 * 对进入当前站台的车辆按照站距进行排序
	 * 
	 * @author bo.li 2014-8-1 上午8:54:50 TODO
	 */
	class BusStopSpacingComparator implements Comparator<BusStationItem>
	{
		public int compare(BusStationItem o1, BusStationItem o2)
		{
			if (o1 != null && o2 != null)
			{
				if (TextUtils.isDigitsOnly(o2.busStopSpacing))
				{
					if (TextUtils.isDigitsOnly(o1.busStopSpacing))
					{
						int o1Int = Integer.parseInt(o1.busStopSpacing);
						int o2Int = Integer.parseInt(o2.busStopSpacing);
						if (o1Int == o2Int)
						{
							if (TextUtils.isDigitsOnly(o1.busNo) && TextUtils.isDigitsOnly(o1.busNo))
							{
								int busNo1 = Integer.parseInt(o1.busNo);
								int busNo2 = Integer.parseInt(o2.busNo);
								if (busNo2 > busNo1)
								{
									return -1;
								}
							}
						}
						else
						{
							if (o2Int > o1Int)
							{
								return -1;
							}
						}
						return 1;
					}
					else if ("进站".equals(o2.busStopSpacing))
					{
						return 1;
					}
					else if ("无车".equals(o2.busStopSpacing))
					{
						return -1;
					}
				}
				else
				{
					if ("进站".equals(o2.busStopSpacing))
					{
						return 1;
					}
					else
					{
						if ("进站".equals(o1.busStopSpacing))
						{
							return 1;
						}
						else if ("无车".equals(o1.busStopSpacing))
						{
							return -1;
						}
					}
					if ("无车".equals(o2.busStopSpacing))
					{
						return -1;
					}
				}
			}
			return 0;
		}
	}
}