BDSearcher.java

package com.ringtone.music;

import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringEscapeUtils;

import android.app.Activity;
import android.content.Context;
import android.os.Handler;
import android.text.TextUtils;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class BDSearcher implements IMusicSearcher {
	
	//private static final String BASE_URL = "http://221.195.40.105:10008/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&lm=0&word=";
	private static final String BASE_URL = "http://221.195.40.183/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&lm=0&word=";
	private static final Pattern PATTERN = Pattern.compile(
			"<tr>\\s*"+
			"<td class=tdn>.*?</td>\\s*" +    
			"<td class=d><a href=\"(.*?)\".*?target=\"_blank\">(.*?)</a></td>\\s*" +
			"<td>(.*?)</td>\\s*" +
			"<td.*?</td>\\s*" +
			"<td.*?</td>\\s*" +
			"<td.*?</td>\\s*" +
			"<td.*?</td>\\s*" +
			"<td>(.*?)</td>.*?" +
			"</tr>" +
			""
			,
			Pattern.DOTALL
			);
	
	private static final Pattern PATTERN_ARTIST = Pattern.compile(
			"<a href=.*?target=\"_blank\">(.*?)</a>",
			Pattern.DOTALL);
	
	private int mStart = 0;
	private String mSearchUrl;
	
	private volatile String mDownloadLink;
	private volatile WebView mWebView;
	private volatile boolean mReady;
	private final Object mLock = new Object();
	
	private String getNextUrl() {
		return mStart == 0 ? mSearchUrl : mSearchUrl + "&pn=" + mStart;
	}

	private ArrayList<MusicInfo> getMusicInfoListFromHtml(String html) {
			Utils.D("+++++++++++++++");
			Utils.printD(html);
			Utils.D("---------------");
			
			ArrayList<MusicInfo> musicList = new ArrayList<MusicInfo>();
			Matcher m = PATTERN.matcher(html);
			while (m.find()) {
				MusicInfo info = new MusicInfo();
				info.addUrl(Utils.trimTag(m.group(1).trim()));
				info.setTitle(StringEscapeUtils.unescapeHtml(Utils.trimTag(m.group(2).trim())));
				info.setDisplayFileSize(Utils.trimTag(m.group(4).trim()));
				
				Matcher m2 = PATTERN_ARTIST.matcher(m.group(3));
				if (m2.find()) {
					info.setArtist(StringEscapeUtils.unescapeHtml(Utils.trimTag(m2.group(1).trim())));
				}
				
				/*
				System.out.println("====================");
				System.out.println(matcherBlock.group(1));
				System.out.println(matcherBlock.group(2));
				System.out.println(matcherBlock.group(3));
				System.out.println(matcherBlock.group(4));
				*/
				musicList.add(info);
			}
			return musicList;
	}

	@Override
	public void setMusicDownloadUrl(Context context, MusicInfo info) {
		mDownloadLink = null;
		mReady = false;
		
		final Activity activity = (Activity)context;
		
		final String url = info.getUrl();
		Utils.D("url: " + url);
		
		activity.runOnUiThread(new Runnable() {

			@Override
			public void run() {
				if (mWebView != null)
					mWebView.destroy();
				mWebView = new WebView(activity);
			    mWebView.getSettings().setLoadsImagesAutomatically(false);
		        mWebView.getSettings().setBlockNetworkImage(true);
				mWebView.getSettings().setJavaScriptEnabled(true);
				mWebView.addJavascriptInterface(new MyJavaScriptInterface(), "HTMLOUT");
				mWebView.setWebViewClient(new FetchLinkWebViewClient());
				mWebView.loadUrl(url);
				
				Utils.D("loadUrl: " + url);
			}
		});
		
		synchronized(mLock) {
			while (!mReady) {
				try {
					mLock.wait();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
					return;
				}
			}
			info.addDownloadUrl(mDownloadLink);
			return;
		}
	}
	
	
	private class MyJavaScriptInterface {
		@SuppressWarnings("unused")
		public void getLink(String html) {
			Utils.D("getLink()");
			
			mDownloadLink = html;
			mReady = true;
			synchronized(mLock) {
				mLock.notify();
			}
		}
	}
	
	private class FetchLinkWebViewClient extends WebViewClient {
		public FetchLinkWebViewClient() {
			super();
		}
		
		@Override
		public void onPageFinished(WebView view, String url) {
			Utils.D("onPageFinished()");
			view.loadUrl("javascript:window.HTMLOUT.getLink(document.getElementById(\'urla\').href);");
		}
	}

	@Override
	public void setQuery(String query) {
		// TODO Auto-generated method stub
		mStart = 0;
		mSearchUrl = BASE_URL + URLEncoder.encode(query);
	}

	@Override
	public ArrayList<MusicInfo> getNextResultList(Context context) {
		try {
			String url = getNextUrl();
			
			Utils.D("URL = " + url);
			
			String html = NetUtils.fetchHtmlPage(MusicSearcherFactory.ID_BAIDU, url, "gb2312");
			if (TextUtils.isEmpty(html))
				return null;
			ArrayList<MusicInfo> musicList = getMusicInfoListFromHtml(html);
			if (musicList.size() > 0) {
				mStart += musicList.size();
			}
			return musicList;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

}