basicplaylist.java

java+eclipse做的TTPlayer

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package com.hadeslee.yoyoplayer.playlist;

import com.hadeslee.yoyoplayer.util.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Vector;

/**
 * 一个播放列表的基本实现
 * @author hadeslee
 */
public class BasicPlayList implements PlayList {

    private static final long serialVersionUID = 20071214L;
    protected Vector<PlayListItem> playList;
    protected int currentIndex = -1;
    protected boolean isModified;
    protected String M3UHome;//MP3U格式列表的位置
    protected String PLSHome;//PLS格式列表的位置
    private String name;//表示此播放列表的名字
    private Config config;//全局的配置对象
    private PlayListItem playing;//正在播放的项
    public BasicPlayList(Config config) {
        this.config = config;
        playList = new Vector<PlayListItem>();
    }

    public boolean load(String filename) {
        setModified(true);
        boolean loaded = false;
        if ((filename != null) && (filename.toLowerCase().endsWith(".m3u"))) {
            loaded = loadM3U(filename);
        } else if ((filename != null) && (filename.toLowerCase().endsWith(".pls"))) {
            loaded = loadPLS(filename);
        }
        return loaded;
    }

    protected boolean loadM3U(String filename) {
        boolean loaded = false;
        BufferedReader br = null;
        try {
            // Playlist from URL ? (http:, ftp:, file: ....)
            if (Config.startWithProtocol(filename)) {
                br = new BufferedReader(new InputStreamReader((new URL(filename)).openStream()));
            } else {
                br = new BufferedReader(new FileReader(filename));
            }
            String line = null;
            String songName = null;
            String songFile = null;
            String songLength = null;
            while ((line = br.readLine()) != null) {
                if (line.trim().length() == 0) {
                    continue;
                }
                if (line.startsWith("#")) {
                    if (line.toUpperCase().startsWith("#EXTINF")) {
                        int indA = line.indexOf(",", 0);
                        if (indA != -1) {
                            songName = line.substring(indA + 1, line.length());
                        }
                        int indB = line.indexOf(":", 0);
                        if (indB != -1) {
                            if (indB < indA) {
                                songLength = (line.substring(indB + 1, indA)).trim();
                            }
                        }
                    }
                } else {
                    songFile = line;
                    if (songName == null) {
                        songName = songFile;
                    }
                    if (songLength == null) {
                        songLength = "-1";
                    }
                    PlayListItem pli = null;
                    if (Config.startWithProtocol(songFile)) {
                        // URL.
                        pli = new PlayListItem(songName, songFile, Long.parseLong(songLength), false);
                    } else {
                        // File.
                        File f = new File(songFile);
                        if (f.exists()) {
                            pli = new PlayListItem(songName, songFile, Long.parseLong(songLength), true);
                        } else {
                            // Try relative path.
                            f = new File(config.getLastDir() + songFile);
                            if (f.exists()) {
                                pli = new PlayListItem(songName, config.getLastDir() + songFile, Long.parseLong(songLength), true);
                            } else {
                                // Try optional M3U home.
                                if (M3UHome != null) {
                                    if (Config.startWithProtocol(M3UHome)) {
                                        pli = new PlayListItem(songName, M3UHome + songFile, Long.parseLong(songLength), false);
                                    } else {
                                        pli = new PlayListItem(songName, M3UHome + songFile, Long.parseLong(songLength), true);
                                    }
                                }
                            }
                        }
                    }
                    if (pli != null) {
                        this.appendItem(pli);
                    }
                    songFile = null;
                    songName = null;
                    songLength = null;
                }
            }
            loaded = true;
        } catch (Exception e) {
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
            } catch (Exception ioe) {
            }
        }
        name = Util.getSongName(new File(filename));
        return loaded;
    }

    protected boolean loadPLS(String filename) {
        boolean loaded = false;
        BufferedReader br = null;
        try {
            // Playlist from URL ? (http:, ftp:, file: ....)
            if (Config.startWithProtocol(filename)) {
                br = new BufferedReader(new InputStreamReader((new URL(filename)).openStream()));
            } else {
                br = new BufferedReader(new FileReader(filename));
            }
            String line = null;
            String songName = null;
            String songFile = null;
            String songLength = null;
            while ((line = br.readLine()) != null) {
                if (line.trim().length() == 0) {
                    continue;
                }
                if ((line.toLowerCase().startsWith("file"))) {
                    StringTokenizer st = new StringTokenizer(line, "=");
                    st.nextToken();
                    songFile = st.nextToken().trim();
                } else if ((line.toLowerCase().startsWith("title"))) {
                    StringTokenizer st = new StringTokenizer(line, "=");
                    st.nextToken();
                    songName = st.nextToken().trim();
                } else if ((line.toLowerCase().startsWith("length"))) {
                    StringTokenizer st = new StringTokenizer(line, "=");
                    st.nextToken();
                    songLength = st.nextToken().trim();
                }
                // New entry ?
                if (songFile != null) {
                    PlayListItem pli = null;
                    if (songName == null) {
                        songName = songFile;
                    }
                    if (songLength == null) {
                        songLength = "-1";
                    }
                    if (Config.startWithProtocol(songFile)) {
                        // URL.
                        pli = new PlayListItem(songName, songFile, Long.parseLong(songLength), false);
                    } else {
                        // File.
                        File f = new File(songFile);
                        if (f.exists()) {
                            pli = new PlayListItem(songName, songFile, Long.parseLong(songLength), true);
                        } else {
                            // Try relative path.
                            f = new File(config.getLastDir() + songFile);
                            if (f.exists()) {
                                pli = new PlayListItem(songName, config.getLastDir() + songFile, Long.parseLong(songLength), true);
                            } else {
                                // Try optional PLS home.
                                if (PLSHome != null) {
                                    if (Config.startWithProtocol(PLSHome)) {
                                        pli = new PlayListItem(songName, PLSHome + songFile, Long.parseLong(songLength), false);
                                    } else {
                                        pli = new PlayListItem(songName, PLSHome + songFile, Long.parseLong(songLength), true);
                                    }
                                }
                            }
                        }
                    }
                    if (pli != null) {
                        this.appendItem(pli);
                    }
                    songName = null;
                    songFile = null;
                    songLength = null;
                }
            }
            loaded = true;
        } catch (Exception e) {
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
            } catch (Exception ioe) {
            }
        }
        name = Util.getSongName(new File(filename));
        return loaded;
    }

    public boolean save(String filename) {
        // Implemented by C.K
        if (playList != null) {
            BufferedWriter bw = null;
            try {
                bw = new BufferedWriter(new FileWriter(filename));
                bw.write("#EXTM3U");