Java tutorial
/* This file is part of Subsonic. Subsonic is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Subsonic 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 for more details. You should have received a copy of the GNU General Public License along with Subsonic. If not, see <http://www.gnu.org/licenses/>. Copyright 2009 (C) Sindre Mehus */ package net.sourceforge.subsonic.ajax; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.Iterator; import java.util.List; import java.util.Locale; import java.util.Arrays; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sourceforge.subsonic.service.MediaFileService; import org.directwebremoting.WebContextFactory; import org.springframework.web.servlet.support.RequestContextUtils; import net.sourceforge.subsonic.domain.MediaFile; import net.sourceforge.subsonic.domain.Player; import net.sourceforge.subsonic.domain.Playlist; import net.sourceforge.subsonic.service.JukeboxService; import net.sourceforge.subsonic.service.PlayerService; import net.sourceforge.subsonic.service.TranscodingService; import net.sourceforge.subsonic.service.SettingsService; import net.sourceforge.subsonic.util.StringUtil; /** * Provides AJAX-enabled services for manipulating the playlist of a player. * This class is used by the DWR framework (http://getahead.ltd.uk/dwr/). * * @author Sindre Mehus */ public class PlaylistService { private PlayerService playerService; private JukeboxService jukeboxService; private TranscodingService transcodingService; private SettingsService settingsService; private MediaFileService mediaFileService; /** * Returns the playlist for the player of the current user. * * @return The playlist. */ public PlaylistInfo getPlaylist() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); return convert(request, player, false); } public PlaylistInfo start() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); return doStart(request, response); } public PlaylistInfo doStart(HttpServletRequest request, HttpServletResponse response) throws Exception { Player player = getCurrentPlayer(request, response); player.getPlaylist().setStatus(Playlist.Status.PLAYING); return convert(request, player, true); } public PlaylistInfo stop() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); return doStop(request, response); } public PlaylistInfo doStop(HttpServletRequest request, HttpServletResponse response) throws Exception { Player player = getCurrentPlayer(request, response); player.getPlaylist().setStatus(Playlist.Status.STOPPED); return convert(request, player, true); } public PlaylistInfo skip(int index) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); return doSkip(request, response, index, 0); } public PlaylistInfo doSkip(HttpServletRequest request, HttpServletResponse response, int index, int offset) throws Exception { Player player = getCurrentPlayer(request, response); player.getPlaylist().setIndex(index); boolean serverSidePlaylist = !player.isExternalWithPlaylist(); return convert(request, player, serverSidePlaylist, offset); } public PlaylistInfo play(String path) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); MediaFile file = mediaFileService.getMediaFile(path); List<MediaFile> files = mediaFileService.getDescendantsOf(file, true); if (player.isWeb()) { removeVideoFiles(files); } player.getPlaylist().addFiles(false, files); player.getPlaylist().setRandomSearchCriteria(null); return convert(request, player, true); } public PlaylistInfo playRandom(String path, int count) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); MediaFile file = mediaFileService.getMediaFile(path); List<MediaFile> randomFiles = getRandomChildren(file, count); Player player = getCurrentPlayer(request, response); player.getPlaylist().addFiles(false, randomFiles); player.getPlaylist().setRandomSearchCriteria(null); return convert(request, player, true); } public PlaylistInfo add(String path) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); return doAdd(request, response, Arrays.asList(path)); } public PlaylistInfo doAdd(HttpServletRequest request, HttpServletResponse response, List<String> paths) throws Exception { Player player = getCurrentPlayer(request, response); List<MediaFile> files = new ArrayList<MediaFile>(paths.size()); for (String path : paths) { MediaFile ancestor = mediaFileService.getMediaFile(path); files.addAll(mediaFileService.getDescendantsOf(ancestor, true)); } if (player.isWeb()) { removeVideoFiles(files); } player.getPlaylist().addFiles(true, files); player.getPlaylist().setRandomSearchCriteria(null); return convert(request, player, false); } public PlaylistInfo doSet(HttpServletRequest request, HttpServletResponse response, List<String> paths) throws Exception { Player player = getCurrentPlayer(request, response); Playlist playlist = player.getPlaylist(); MediaFile currentFile = playlist.getCurrentFile(); Playlist.Status status = playlist.getStatus(); playlist.clear(); PlaylistInfo result = doAdd(request, response, paths); int index = currentFile == null ? -1 : playlist.getFiles().indexOf(currentFile); playlist.setIndex(index); playlist.setStatus(status); return result; } public PlaylistInfo clear() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); return doClear(request, response); } public PlaylistInfo doClear(HttpServletRequest request, HttpServletResponse response) throws Exception { Player player = getCurrentPlayer(request, response); player.getPlaylist().clear(); boolean serverSidePlaylist = !player.isExternalWithPlaylist(); return convert(request, player, serverSidePlaylist); } public PlaylistInfo shuffle() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); return doShuffle(request, response); } public PlaylistInfo doShuffle(HttpServletRequest request, HttpServletResponse response) throws Exception { Player player = getCurrentPlayer(request, response); player.getPlaylist().shuffle(); return convert(request, player, false); } public PlaylistInfo remove(int index) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); return doRemove(request, response, index); } public PlaylistInfo doRemove(HttpServletRequest request, HttpServletResponse response, int index) throws Exception { Player player = getCurrentPlayer(request, response); player.getPlaylist().removeFileAt(index); return convert(request, player, false); } public PlaylistInfo removeMany(int[] indexes) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); for (int i = indexes.length - 1; i >= 0; i--) { player.getPlaylist().removeFileAt(indexes[i]); } return convert(request, player, false); } public PlaylistInfo up(int index) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); player.getPlaylist().moveUp(index); return convert(request, player, false); } public PlaylistInfo down(int index) throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); player.getPlaylist().moveDown(index); return convert(request, player, false); } public PlaylistInfo toggleRepeat() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); player.getPlaylist().setRepeatEnabled(!player.getPlaylist().isRepeatEnabled()); return convert(request, player, false); } public PlaylistInfo undo() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); player.getPlaylist().undo(); boolean serverSidePlaylist = !player.isExternalWithPlaylist(); return convert(request, player, serverSidePlaylist); } public PlaylistInfo sortByTrack() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); player.getPlaylist().sort(Playlist.SortOrder.TRACK); return convert(request, player, false); } public PlaylistInfo sortByArtist() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); player.getPlaylist().sort(Playlist.SortOrder.ARTIST); return convert(request, player, false); } public PlaylistInfo sortByAlbum() throws Exception { HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); HttpServletResponse response = WebContextFactory.get().getHttpServletResponse(); Player player = getCurrentPlayer(request, response); player.getPlaylist().sort(Playlist.SortOrder.ALBUM); return convert(request, player, false); } public void setGain(float gain) { jukeboxService.setGain(gain); } private List<MediaFile> getRandomChildren(MediaFile file, int count) throws IOException { List<MediaFile> children = mediaFileService.getDescendantsOf(file, false); removeVideoFiles(children); if (children.isEmpty()) { return children; } Collections.shuffle(children); return children.subList(0, Math.min(count, children.size())); } private void removeVideoFiles(List<MediaFile> files) { Iterator<MediaFile> iterator = files.iterator(); while (iterator.hasNext()) { MediaFile file = iterator.next(); if (file.isVideo()) { iterator.remove(); } } } private PlaylistInfo convert(HttpServletRequest request, Player player, boolean sendM3U) throws Exception { return convert(request, player, sendM3U, 0); } private PlaylistInfo convert(HttpServletRequest request, Player player, boolean sendM3U, int offset) throws Exception { String url = request.getRequestURL().toString(); if (sendM3U && player.isJukebox()) { jukeboxService.updateJukebox(player, offset); } boolean isCurrentPlayer = player.getIpAddress() != null && player.getIpAddress().equals(request.getRemoteAddr()); boolean m3uSupported = player.isExternal() || player.isExternalWithPlaylist(); sendM3U = player.isAutoControlEnabled() && m3uSupported && isCurrentPlayer && sendM3U; Locale locale = RequestContextUtils.getLocale(request); List<PlaylistInfo.Entry> entries = new ArrayList<PlaylistInfo.Entry>(); Playlist playlist = player.getPlaylist(); for (MediaFile file : playlist.getFiles()) { String albumUrl = url.replaceFirst("/dwr/.*", "/main.view?pathUtf8Hex=" + StringUtil.utf8HexEncode(file.getParentPath())); String streamUrl = url.replaceFirst("/dwr/.*", "/stream?player=" + player.getId() + "&pathUtf8Hex=" + StringUtil.utf8HexEncode(file.getPath())); // Rewrite URLs in case we're behind a proxy. if (settingsService.isRewriteUrlEnabled()) { String referer = request.getHeader("referer"); albumUrl = StringUtil.rewriteUrl(albumUrl, referer); streamUrl = StringUtil.rewriteUrl(streamUrl, referer); } String format = formatFormat(player, file); entries.add(new PlaylistInfo.Entry(file.getTrackNumber(), file.getTitle(), file.getArtist(), file.getAlbumName(), file.getGenre(), file.getYear(), formatBitRate(file), file.getDurationSeconds(), file.getDurationString(), format, formatContentType(format), formatFileSize(file.getFileSize(), locale), albumUrl, streamUrl)); } boolean isStopEnabled = playlist.getStatus() == Playlist.Status.PLAYING && !player.isExternalWithPlaylist(); float gain = jukeboxService.getGain(); return new PlaylistInfo(entries, playlist.getIndex(), isStopEnabled, playlist.isRepeatEnabled(), sendM3U, gain); } private String formatFileSize(Long fileSize, Locale locale) { if (fileSize == null) { return null; } return StringUtil.formatBytes(fileSize, locale); } private String formatFormat(Player player, MediaFile file) { return transcodingService.getSuffix(player, file, null); } private String formatContentType(String format) { return StringUtil.getMimeType(format); } private String formatBitRate(MediaFile mediaFile) { if (mediaFile.getBitRate() == null) { return null; } if (mediaFile.isVariableBitRate()) { return mediaFile.getBitRate() + " Kbps vbr"; } return mediaFile.getBitRate() + " Kbps"; } private Player getCurrentPlayer(HttpServletRequest request, HttpServletResponse response) { return playerService.getPlayer(request, response); } public void setPlayerService(PlayerService playerService) { this.playerService = playerService; } public void setMediaFileService(MediaFileService mediaFileService) { this.mediaFileService = mediaFileService; } public void setJukeboxService(JukeboxService jukeboxService) { this.jukeboxService = jukeboxService; } public void setTranscodingService(TranscodingService transcodingService) { this.transcodingService = transcodingService; } public void setSettingsService(SettingsService settingsService) { this.settingsService = settingsService; } }