| /* |
| * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.media.sound; |
| |
| import javax.sound.midi.MidiDevice; |
| |
| /** |
| * MIDI input device provider. |
| * |
| * @author Kara Kytle |
| * @author Florian Bomers |
| */ |
| public final class MidiInDeviceProvider extends AbstractMidiDeviceProvider { |
| |
| /** Cache of info objects for all MIDI output devices on the system. */ |
| private static Info[] infos = null; |
| |
| /** Cache of open MIDI input devices on the system. */ |
| private static MidiDevice[] devices = null; |
| |
| private static final boolean enabled; |
| |
| static { |
| // initialize |
| Platform.initialize(); |
| enabled = Platform.isMidiIOEnabled(); |
| } |
| |
| /** |
| * Required public no-arg constructor. |
| */ |
| public MidiInDeviceProvider() { |
| if (Printer.trace) Printer.trace("MidiInDeviceProvider: constructor"); |
| } |
| |
| // implementation of abstract methods in AbstractMidiDeviceProvider |
| |
| @Override |
| AbstractMidiDeviceProvider.Info createInfo(int index) { |
| if (!enabled) { |
| return null; |
| } |
| return new MidiInDeviceInfo(index, MidiInDeviceProvider.class); |
| } |
| |
| @Override |
| MidiDevice createDevice(AbstractMidiDeviceProvider.Info info) { |
| if (enabled && (info instanceof MidiInDeviceInfo)) { |
| return new MidiInDevice(info); |
| } |
| return null; |
| } |
| |
| @Override |
| int getNumDevices() { |
| if (!enabled) { |
| if (Printer.debug)Printer.debug("MidiInDevice not enabled, returning 0 devices"); |
| return 0; |
| } |
| int numDevices = nGetNumDevices(); |
| if (Printer.debug)Printer.debug("MidiInDeviceProvider.getNumDevices(): devices: " + numDevices); |
| return numDevices; |
| } |
| |
| @Override |
| MidiDevice[] getDeviceCache() { return devices; } |
| @Override |
| void setDeviceCache(MidiDevice[] devices) { MidiInDeviceProvider.devices = devices; } |
| @Override |
| Info[] getInfoCache() { return infos; } |
| @Override |
| void setInfoCache(Info[] infos) { MidiInDeviceProvider.infos = infos; } |
| |
| /** |
| * Info class for MidiInDevices. Adds the |
| * provider's Class to keep the provider class from being |
| * unloaded. Otherwise, at least on JDK1.1.7 and 1.1.8, |
| * the provider class can be unloaded. Then, then the provider |
| * is next invoked, the static block is executed again and a new |
| * instance of the device object is created. Even though the |
| * previous instance may still exist and be open / in use / etc., |
| * the new instance will not reflect that state... |
| */ |
| static final class MidiInDeviceInfo extends AbstractMidiDeviceProvider.Info { |
| private final Class<?> providerClass; |
| |
| private MidiInDeviceInfo(int index, Class<?> providerClass) { |
| super(nGetName(index), nGetVendor(index), nGetDescription(index), nGetVersion(index), index); |
| this.providerClass = providerClass; |
| } |
| |
| } // class MidiInDeviceInfo |
| |
| private static native int nGetNumDevices(); |
| private static native String nGetName(int index); |
| private static native String nGetVendor(int index); |
| private static native String nGetDescription(int index); |
| private static native String nGetVersion(int index); |
| } |