1 /*
   2  * Copyright (c) 2008, 2012, 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 sun.nio.ch;
  27 
  28 import java.nio.channels.spi.AsynchronousChannelProvider;
  29 import sun.security.action.GetPropertyAction;
  30 
  31 /**
  32  * Creates this platform's default asynchronous channel provider
  33  */
  34 
  35 public class DefaultAsynchronousChannelProvider {
  36 
  37     /**
  38      * Prevent instantiation.
  39      */
  40     private DefaultAsynchronousChannelProvider() { }
  41 
  42     @SuppressWarnings("unchecked")
  43     private static AsynchronousChannelProvider createProvider(String cn) {
  44         Class<AsynchronousChannelProvider> c;
  45         try {
  46             c = (Class<AsynchronousChannelProvider>)Class.forName(cn);
  47         } catch (ClassNotFoundException x) {
  48             throw new AssertionError(x);
  49         }
  50         try {
  51             return c.newInstance();
  52         } catch (IllegalAccessException | InstantiationException x) {
  53             throw new AssertionError(x);
  54         }
  55 
  56     }
  57 
  58     /**
  59      * Returns the default AsynchronousChannelProvider.
  60      */
  61     public static AsynchronousChannelProvider create() {
  62         String osname = GetPropertyAction.getProperty("os.name");
  63         if (osname.equals("SunOS"))
  64             return createProvider("sun.nio.ch.SolarisAsynchronousChannelProvider");
  65         if (osname.equals("Linux"))
  66             return createProvider("sun.nio.ch.LinuxAsynchronousChannelProvider");
  67         if (osname.contains("OS X"))
  68             return createProvider("sun.nio.ch.BsdAsynchronousChannelProvider");
  69         if (osname.equals("AIX"))
  70             return createProvider("sun.nio.ch.AixAsynchronousChannelProvider");
  71         throw new InternalError("platform not recognized");
  72     }
  73 }