简约的java音乐播放器

/* * Copyright (C) 2007 Tobias Winterhalter ([email protected]) * * 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 2 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, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ package dplayer; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Properties; import org.apache.log4j.PropertyConfigurator; /** * Collection of settings. * * @author Tobias Winterhalter */ public class Settings { protected enum OsType { GENERIC, LINUX, WIN } /** * Name of properties file. */ private static final String FILENAME = "dplayer.properties"; /** * Singleton instance, created at class loading time. */ private static final Settings sInstance = new Settings(); /** * Property for main window's horizontal position on the screen (int value). */ public static final Property WINDOW_X = new Property("window.x", "0"); /** * Property for main window's vertical position on the screen (int value). */ public static final Property WINDOW_Y = new Property("window.y", "0"); /** * Property for main window's width (int value). */ public static final Property WINDOW_W = new Property("window.w", "640"); /** * Property for main window's height (int value). */ public static final Property WINDOW_H = new Property("window.h", "480"); public static final Property WINDOW_MAXIMIZED = new Property("window.maximized", "false"); public static final Property WINDOW_MINIMIZED = new Property("window.minimized", "false"); public static final Property TABLE_COLUMN1_W = new Property("table.column1.w", "200"); public static final Property TABLE_COLUMN2_W = new Property("table.column2.w", "80"); public static final Property TREE_W = new Property("tree.w", "30"); public static final Property VOLUME = new Property("volume", "40"); public static final Property ROOTS = new Property("roots", "List of roots to be searched for music files.", ""); public static final Property MIXER = new Property("mixer", "Media mixer to use for volume control.", "xmix"); public static final Property PLAYER = new Property("player", "Media player to use for playback.", "mplayer"); public static final Property DISPLAY_SKIPPED = new Property("display.skipped", "Display (or hide) tracks that are marked to be skipped by player.", "false"); public static final Property DISPLAY_COVER = new Property("display.cover", "Try to display cover as background of track table.", "true"); public static final Property LOG_ROOT_LOGGER = new Property("log4j.rootLogger", "INFO, STDOUT"); public static final Property LOG_APPENDER = new Property("log4j.appender.STDOUT", "org.apache.log4j.ConsoleAppender"); public static final Property LOG_LAYOUT = new Property("log4j.appender.STDOUT.layout", "org.apache.log4j.PatternLayout"); public static final Property LOG_PATTERN = new Property("log4j.appender.STDOUT.layout.ConversionPattern", "%-4r %-5p [%t] %c - %m%n"); public static final Property CACHE_ENABLED = new Property("cache.enabled", "Enable caching of music file properties (e.g. tags, 'skip' flag, ...).", "true"); public static final Property CACHE_SONGS_FILE = new Property("cache.songs.file", "File for music file cache.", "songs.db"); public static final Property HISTORY_LAST_DIR = new Property("history.last.dir", ""); /* * Define sections. */ static { addSection("Manual settings.", 100, new Property[] { ROOTS, PLAYER, MIXER, DISPLAY_SKIPPED, DISPLAY_COVER }); addSection("Cache settings.", 90, new Property[] { CACHE_ENABLED, CACHE_SONGS_FILE }); addSection("Automatic settings - will be overwritten when application is closed.", 30, new Property[] { VOLUME, TREE_W, TABLE_COLUMN1_W, TABLE_COLUMN2_W, WINDOW_X, WINDOW_Y, WINDOW_W, WINDOW_H, WINDOW_MAXIMIZED, WINDOW_MINIMIZED, HISTORY_LAST_DIR }); addSection("Log4j settings.", 0, new Property[] { LOG_ROOT_LOGGER, LOG_APPENDER, LOG_LAYOUT, LOG_PATTERN }); } /** * Store actual list of properties. */ private final Properties mProperties; /** * Create and initialize (read from file) properties. */ protected Settings() { mProperties = new Properties(); try { mProperties.load(new FileInputStream(FILENAME)); PropertyConfigurator.configure(mProperties); } catch (IOException e) { // No properties file. Continue with defaults. } } /** * Save properties. Failure to save is not considered as serious problem * and a warning message is logged only. */ public static void save() { BufferedWriter out = null; BufferedReader in = null; try { // Open new temporary output file. Make sure it doesn't exist already. final File outFile = new File("~" + FILENAME); if (outFile.exists()) { if (!outFile.delete()) { throw new IOException("Unable to delete temporary properties file " + outFile.getPath() + "."); } } out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outFile))); // Open and read current properties file. final File inFile = new File(FILENAME); if (inFile.exists()) { in = new BufferedReader(new InputStreamReader(new FileInputStream(inFile))); final Properties p = new Properties(); String line; while ((line = in.readLine()) != null) { // Keep empty lines and comments. if (line.trim().length() == 0 || line.startsWith("#")) { out.write(line); out.newLine(); } // Parse line with property definition. p.clear(); p.load(new ByteArrayInputStream(line.getBytes())); for (Object key : p.keySet()) { if (sInstance.mProperties.get(key) != null) { // Output property with current value; out.write((String) key + " = " + sInstance.mProperties.get(key)); out.newLine(); } else { // Property seems to be removed. Don't output it anymore. } } } in.close(); // Note: New runtime properties are not supported and simply ignored. } else { // Write ne