1 /* 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.media.sound; 27 28 import javax.sound.midi.MidiDevice; 29 30 31 /** 32 * MIDI output device provider. 33 * 34 * @author Kara Kytle 35 * @author Florian Bomers 36 */ 37 public final class MidiOutDeviceProvider extends AbstractMidiDeviceProvider { 38 39 /** Cache of info objects for all MIDI output devices on the system. */ 40 private static Info[] infos = null; 41 42 /** Cache of open MIDI output devices on the system. */ 43 private static MidiDevice[] devices = null; 44 45 private final static boolean enabled; 46 47 // STATIC 48 49 static { 50 // initialize 51 Platform.initialize(); 52 enabled = Platform.isMidiIOEnabled(); 53 } 54 55 // CONSTRUCTOR 56 57 /** 58 * Required public no-arg constructor. 59 */ 60 public MidiOutDeviceProvider() { 61 if (Printer.trace) Printer.trace("MidiOutDeviceProvider: constructor"); 62 } 63 64 // implementation of abstract methods in AbstractMidiDeviceProvider 65 66 AbstractMidiDeviceProvider.Info createInfo(int index) { 67 if (!enabled) { 68 return null; 69 } 70 return new MidiOutDeviceInfo(index, MidiOutDeviceProvider.class); 71 } 72 73 MidiDevice createDevice(AbstractMidiDeviceProvider.Info info) { 74 if (enabled && (info instanceof MidiOutDeviceInfo)) { 75 return new MidiOutDevice(info); 76 } 77 return null; 78 } 79 80 int getNumDevices() { 81 if (!enabled) { 82 if (Printer.debug)Printer.debug("MidiOutDevice not enabled, returning 0 devices"); 83 return 0; 84 } 85 return nGetNumDevices(); 86 } 87 88 MidiDevice[] getDeviceCache() { return devices; } 89 void setDeviceCache(MidiDevice[] devices) { this.devices = devices; } 90 Info[] getInfoCache() { return infos; } 91 void setInfoCache(Info[] infos) { this.infos = infos; } 92 93 94 // INNER CLASSES 95 96 /** 97 * Info class for MidiOutDevices. Adds the 98 * provider's Class to keep the provider class from being 99 * unloaded. Otherwise, at least on JDK1.1.7 and 1.1.8, 100 * the provider class can be unloaded. Then, then the provider 101 * is next invoked, the static block is executed again and a new 102 * instance of the device object is created. Even though the 103 * previous instance may still exist and be open / in use / etc., 104 * the new instance will not reflect that state... 105 */ 106 static final class MidiOutDeviceInfo extends AbstractMidiDeviceProvider.Info { 107 private final Class providerClass; 108 109 private MidiOutDeviceInfo(int index, Class providerClass) { 110 super(nGetName(index), nGetVendor(index), nGetDescription(index), nGetVersion(index), index); 111 this.providerClass = providerClass; 112 } 113 114 } // class MidiOutDeviceInfo 115 116 117 // NATIVE METHODS 118 119 private static native int nGetNumDevices(); 120 private static native String nGetName(int index); 121 private static native String nGetVendor(int index); 122 private static native String nGetDescription(int index); 123 private static native String nGetVersion(int index); 124 }