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/*
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* Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.media.sound;
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import javax.sound.midi.MidiDevice;
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import javax.sound.midi.spi.MidiDeviceProvider;
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/**
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* Super class for MIDI input or output device provider.
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*
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* @author Florian Bomers
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*/
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public abstract class AbstractMidiDeviceProvider extends MidiDeviceProvider {
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private static boolean enabled;
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/**
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* Create objects representing all MIDI output devices on the system.
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*/
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static {
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if (Printer.trace) Printer.trace("AbstractMidiDeviceProvider: static");
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Platform.initialize();
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enabled = Platform.isMidiIOEnabled();
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if (Printer.trace) Printer.trace("AbstractMidiDeviceProvider: enabled: " + enabled);
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// $$fb number of MIDI devices may change with time
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// also for memory's sake, do not initialize the arrays here
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}
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synchronized void readDeviceInfos() {
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Info[] infos = getInfoCache();
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MidiDevice[] devices = getDeviceCache();
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if (!enabled) {
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if (infos == null || infos.length != 0) {
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setInfoCache(new Info[0]);
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}
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if (devices == null || devices.length != 0) {
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setDeviceCache(new MidiDevice[0]);
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}
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return;
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}
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int oldNumDevices = (infos==null)?-1:infos.length;
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int newNumDevices = getNumDevices();
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if (oldNumDevices != newNumDevices) {
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if (Printer.trace) Printer.trace(getClass().toString()
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+": readDeviceInfos: old numDevices: "+oldNumDevices
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+" newNumDevices: "+ newNumDevices);
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// initialize the arrays
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Info[] newInfos = new Info[newNumDevices];
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MidiDevice[] newDevices = new MidiDevice[newNumDevices];
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for (int i = 0; i < newNumDevices; i++) {
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Info newInfo = createInfo(i);
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// in case that we are re-reading devices, try to find
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// the previous one and reuse it
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if (infos != null) {
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for (int ii = 0; ii < infos.length; ii++) {
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Info info = infos[ii];
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if (info != null && info.equalStrings(newInfo)) {
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// new info matches the still existing info. Use old one
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newInfos[i] = info;
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info.setIndex(i);
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infos[ii] = null; // prevent re-use
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newDevices[i] = devices[ii];
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devices[ii] = null;
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break;
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}
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}
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}
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if (newInfos[i] == null) {
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newInfos[i] = newInfo;
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}
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}
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// the remaining MidiDevice.Info instances in the infos array
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// have become obsolete.
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if (infos != null) {
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for (int i = 0; i < infos.length; i++) {
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if (infos[i] != null) {
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// disable this device info
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infos[i].setIndex(-1);
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}
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// what to do with the MidiDevice instances that are left
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// in the devices array ?? Close them ?
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}
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}
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// commit new list of infos.
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setInfoCache(newInfos);
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setDeviceCache(newDevices);
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}
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}
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public MidiDevice.Info[] getDeviceInfo() {
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readDeviceInfos();
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Info[] infos = getInfoCache();
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MidiDevice.Info[] localArray = new MidiDevice.Info[infos.length];
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System.arraycopy(infos, 0, localArray, 0, infos.length);
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return localArray;
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}
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public MidiDevice getDevice(MidiDevice.Info info) {
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if (info instanceof Info) {
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readDeviceInfos();
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MidiDevice[] devices = getDeviceCache();
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Info[] infos = getInfoCache();
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Info thisInfo = (Info) info;
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int index = thisInfo.getIndex();
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if (index >= 0 && index < devices.length && infos[index] == info) {
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if (devices[index] == null) {
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devices[index] = createDevice(thisInfo);
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}
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if (devices[index] != null) {
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return devices[index];
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}
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}
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}
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throw new IllegalArgumentException("MidiDevice " + info.toString()
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+ " not supported by this provider.");
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}
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// INNER CLASSES
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/**
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* Info class for MidiDevices. Adds an index value for
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* making native references to a particular device.
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*/
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static class Info extends MidiDevice.Info {
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private int index;
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Info(String name, String vendor, String description, String version, int index) {
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super(name, vendor, description, version);
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this.index = index;
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}
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boolean equalStrings(Info info) {
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return (info != null
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&& getName().equals(info.getName())
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&& getVendor().equals(info.getVendor())
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&& getDescription().equals(info.getDescription())
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&& getVersion().equals(info.getVersion()));
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}
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int getIndex() {
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return index;
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}
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void setIndex(int index) {
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this.index = index;
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}
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} // class Info
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// ABSTRACT METHODS
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abstract int getNumDevices();
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abstract MidiDevice[] getDeviceCache();
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abstract void setDeviceCache(MidiDevice[] devices);
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abstract Info[] getInfoCache();
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abstract void setInfoCache(Info[] infos);
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abstract Info createInfo(int index);
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abstract MidiDevice createDevice(Info info);
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}
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