1/* 2 * Copyright (c) 1999, 2014, 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 26package com.sun.media.sound; 27 28import javax.sound.midi.MidiDevice; 29 30/** 31 * MIDI input device provider. 32 * 33 * @author Kara Kytle 34 * @author Florian Bomers 35 */ 36public final class MidiInDeviceProvider extends AbstractMidiDeviceProvider { 37 38 /** Cache of info objects for all MIDI output devices on the system. */ 39 private static Info[] infos = null; 40 41 /** Cache of open MIDI input devices on the system. */ 42 private static MidiDevice[] devices = null; 43 44 private static final boolean enabled; 45 46 static { 47 // initialize 48 Platform.initialize(); 49 enabled = Platform.isMidiIOEnabled(); 50 } 51 52 /** 53 * Required public no-arg constructor. 54 */ 55 public MidiInDeviceProvider() { 56 if (Printer.trace) Printer.trace("MidiInDeviceProvider: constructor"); 57 } 58 59 // implementation of abstract methods in AbstractMidiDeviceProvider 60 61 @Override 62 AbstractMidiDeviceProvider.Info createInfo(int index) { 63 if (!enabled) { 64 return null; 65 } 66 return new MidiInDeviceInfo(index, MidiInDeviceProvider.class); 67 } 68 69 @Override 70 MidiDevice createDevice(AbstractMidiDeviceProvider.Info info) { 71 if (enabled && (info instanceof MidiInDeviceInfo)) { 72 return new MidiInDevice(info); 73 } 74 return null; 75 } 76 77 @Override 78 int getNumDevices() { 79 if (!enabled) { 80 if (Printer.debug)Printer.debug("MidiInDevice not enabled, returning 0 devices"); 81 return 0; 82 } 83 int numDevices = nGetNumDevices(); 84 if (Printer.debug)Printer.debug("MidiInDeviceProvider.getNumDevices(): devices: " + numDevices); 85 return numDevices; 86 } 87 88 @Override 89 MidiDevice[] getDeviceCache() { return devices; } 90 @Override 91 void setDeviceCache(MidiDevice[] devices) { MidiInDeviceProvider.devices = devices; } 92 @Override 93 Info[] getInfoCache() { return infos; } 94 @Override 95 void setInfoCache(Info[] infos) { MidiInDeviceProvider.infos = infos; } 96 97 /** 98 * Info class for MidiInDevices. Adds the 99 * provider's Class to keep the provider class from being 100 * unloaded. Otherwise, at least on JDK1.1.7 and 1.1.8, 101 * the provider class can be unloaded. Then, then the provider 102 * is next invoked, the static block is executed again and a new 103 * instance of the device object is created. Even though the 104 * previous instance may still exist and be open / in use / etc., 105 * the new instance will not reflect that state... 106 */ 107 static final class MidiInDeviceInfo extends AbstractMidiDeviceProvider.Info { 108 private final Class<?> providerClass; 109 110 private MidiInDeviceInfo(int index, Class<?> providerClass) { 111 super(nGetName(index), nGetVendor(index), nGetDescription(index), nGetVersion(index), index); 112 this.providerClass = providerClass; 113 } 114 115 } // class MidiInDeviceInfo 116 117 private static native int nGetNumDevices(); 118 private static native String nGetName(int index); 119 private static native String nGetVendor(int index); 120 private static native String nGetDescription(int index); 121 private static native String nGetVersion(int index); 122} 123