/* * Copyright (c) 2008, 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.sampled.Mixer;import javax.sound.sampled.Mixer.Info;import javax.sound.sampled.spi.MixerProvider; /** * Provider for software audio mixer * * @author Karl Helgason */public class SoftMixingMixerProvider extends MixerProvider {     static SoftMixingMixer globalmixer = null;     static Thread lockthread = null;     protected final static Object mutex = new Object();     public Mixer getMixer(Info info) {        if (!(info == null || info == SoftMixingMixer.info)) {            throw new IllegalArgumentException("Mixer " + info.toString()                    + " not supported by this provider.");        }        synchronized (mutex) {            if (lockthread != null)                if (Thread.currentThread() == lockthread)                    throw new IllegalArgumentException("Mixer "                            + info.toString()                            + " not supported by this provider.");            if (globalmixer == null)                globalmixer = new SoftMixingMixer();            return globalmixer;        }     }     public Info[] getMixerInfo() {        return new Info[] { SoftMixingMixer.info };    } }