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 input device provider. 33 * 34 * @author Kara Kytle 35 * @author Florian Bomers 36 */ 37 public final class MidiInDeviceProvider 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 input devices on the system. */ 43 private static MidiDevice[] devices = null; 44 45 private static final 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 MidiInDeviceProvider() { 61 if (Printer.trace) Printer.trace("MidiInDeviceProvider: 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 MidiInDeviceInfo(index, MidiInDeviceProvider.class); 71 } 72 73 MidiDevice createDevice(AbstractMidiDeviceProvider.Info info) { 74 if (enabled && (info instanceof MidiInDeviceInfo)) { 75 return new MidiInDevice(info); 76 } 77 return null; 78 } 79 80 int getNumDevices() { 81 if (!enabled) { 82 if (Printer.debug)Printer.debug("MidiInDevice not enabled, returning 0 devices"); 83 return 0; 84 } 85 int numDevices = nGetNumDevices(); 86 if (Printer.debug)Printer.debug("MidiInDeviceProvider.getNumDevices(): devices: " + numDevices); 87 return numDevices; 88 } 89 90 MidiDevice[] getDeviceCache() { return devices; } 91 void setDeviceCache(MidiDevice[] devices) { this.devices = devices; } 92 Info[] getInfoCache() { return infos; } 93 void setInfoCache(Info[] infos) { this.infos = infos; } 94 95 96 // INNER CLASSES 97 98 /** 99 * Info class for MidiInDevices. Adds the 100 * provider's Class to keep the provider class from being 101 * unloaded. Otherwise, at least on JDK1.1.7 and 1.1.8, 102 * the provider class can be unloaded. Then, then the provider 103 * is next invoked, the static block is executed again and a new 104 * instance of the device object is created. Even though the 105 * previous instance may still exist and be open / in use / etc., 106 * the new instance will not reflect that state... 107 */ 108 static final class MidiInDeviceInfo extends AbstractMidiDeviceProvider.Info { 109 private final Class providerClass; 110 111 private MidiInDeviceInfo(int index, Class providerClass) { 112 super(nGetName(index), nGetVendor(index), nGetDescription(index), nGetVersion(index), index); 113 this.providerClass = providerClass; 114 } 115 116 } // class MidiInDeviceInfo 117 118 119 // NATIVE METHODS 120 121 private static native int nGetNumDevices(); 122 private static native String nGetName(int index); 123 private static native String nGetVendor(int index); 124 private static native String nGetDescription(int index); 125 private static native String nGetVersion(int index); 126 }