Java tutorial
/* * Copyright (C) 2013 * * This file is part of Messic. * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package org.messic.server.api; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import org.messic.server.api.datamodel.Playlist; import org.messic.server.api.datamodel.Song; import org.messic.server.api.datamodel.User; import org.messic.server.api.exceptions.ExistingMessicException; import org.messic.server.api.exceptions.ResourceNotFoundMessicException; import org.messic.server.api.exceptions.SidNotFoundMessicException; import org.messic.server.datamodel.MDOPlaylist; import org.messic.server.datamodel.MDOSong; import org.messic.server.datamodel.dao.DAOMessicSettings; import org.messic.server.datamodel.dao.DAOPlaylist; import org.messic.server.datamodel.dao.DAOSong; import org.messic.server.datamodel.dao.DAOUser; import org.messic.server.playlists.m3u.M3U; import org.messic.server.playlists.m3u.Resource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.transaction.annotation.Transactional; @Transactional @Component public class APIPlayLists { @Autowired private DAOPlaylist daoPlaylist; @Autowired private DAOMessicSettings daoSettings; @Autowired private DAOUser daoUser; @Autowired private DAOSong daoSong; @Transactional public void getPlaylistZip(User user, Long playlistSid, OutputStream os) throws IOException, SidNotFoundMessicException { MDOPlaylist mdoplaylist = daoPlaylist.get(user.getLogin(), playlistSid); if (mdoplaylist == null) { throw new SidNotFoundMessicException(); } List<MDOSong> desiredSongs = mdoplaylist.getSongs(); ZipOutputStream zos = new ZipOutputStream(os); // level - the compression level (0-9) zos.setLevel(9); HashMap<String, String> songs = new HashMap<String, String>(); M3U m3u = new M3U(); m3u.setExtensionM3U(true); List<Resource> resources = m3u.getResources(); for (MDOSong song : desiredSongs) { if (song != null) { // add file // extract the relative name for entry purpose String entryName = song.getLocation(); if (songs.get(entryName) == null) { Resource r = new Resource(); r.setLocation(song.getLocation()); r.setName(song.getName()); resources.add(r); songs.put(entryName, "ok"); // song not repeated ZipEntry ze = new ZipEntry(entryName); zos.putNextEntry(ze); FileInputStream in = new FileInputStream(song.calculateAbsolutePath(daoSettings.getSettings())); int len; byte buffer[] = new byte[1024]; while ((len = in.read(buffer)) > 0) { zos.write(buffer, 0, len); } in.close(); zos.closeEntry(); } } } // the last is the playlist m3u ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { m3u.writeTo(baos, "UTF8"); // song not repeated ZipEntry ze = new ZipEntry(mdoplaylist.getName() + ".m3u"); zos.putNextEntry(ze); byte[] bytes = baos.toByteArray(); zos.write(bytes, 0, bytes.length); zos.closeEntry(); } catch (Exception e) { e.printStackTrace(); } zos.close(); } public void createOrUpdate(User user, Playlist playlist) throws SidNotFoundMessicException, ExistingMessicException { MDOPlaylist mdoplaylist = null; if (playlist.getSid() > 0) { // UPDATE A PLAYLIST mdoplaylist = daoPlaylist.get(user.getLogin(), playlist.getSid()); if (mdoplaylist == null) { throw new SidNotFoundMessicException(); } } else { MDOPlaylist existent = daoPlaylist.getByName(user.getLogin(), playlist.getName()); if (existent == null) { mdoplaylist = new MDOPlaylist(); mdoplaylist.setOwner(daoUser.getUserByLogin(user.getLogin())); } else { throw new ExistingMessicException(); } } mdoplaylist.setName(playlist.getName()); ArrayList<MDOSong> songs = new ArrayList<MDOSong>(); for (int i = 0; i < playlist.getSongs().size(); i++) { Song song = playlist.getSongs().get(i); MDOSong mdoSong = daoSong.get(user.getLogin(), song.getSid()); if (mdoSong != null) { songs.add(mdoSong); } else { throw new SidNotFoundMessicException(); } } mdoplaylist.setSongs(songs); daoPlaylist.save(mdoplaylist); } @Transactional public void remove(User user, long playlistSid) { MDOPlaylist mdoPlaylist = this.daoPlaylist.get(user.getLogin(), playlistSid); if (mdoPlaylist != null) { this.daoPlaylist.remove(mdoPlaylist); } } @Transactional public Playlist getPlaylist(User user, long playlistSid, boolean copySongs) throws ResourceNotFoundMessicException { MDOPlaylist mdoPlaylist = daoPlaylist.get(user.getLogin(), playlistSid); if (mdoPlaylist != null) { Playlist pl = new Playlist(mdoPlaylist, copySongs); return pl; } else { throw new ResourceNotFoundMessicException("Playlist not found!"); } } @Transactional public List<Playlist> getAllLists(User user, boolean copySongs) { List<MDOPlaylist> playlists = daoPlaylist.getAll(user.getLogin()); List<Playlist> result = new ArrayList<Playlist>(); for (MDOPlaylist mdoPlaylist : playlists) { Playlist pl = new Playlist(mdoPlaylist, copySongs); result.add(pl); } return result; } }