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      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 java.security.AccessController;
     30 import sun.security.action.GetPropertyAction;
     31 
     32 /**
     33  * Creates this platform's default asynchronous channel provider
     34  */
     35 
     36 public class DefaultAsynchronousChannelProvider {
     37 
     38     /**
     39      * Prevent instantiation.
     40      */
     41     private DefaultAsynchronousChannelProvider() { }
     42 
     43     @SuppressWarnings("unchecked")
     44     private static AsynchronousChannelProvider createProvider(String cn) {
     45         Class<AsynchronousChannelProvider> c;
     46         try {
     47             c = (Class<AsynchronousChannelProvider>)Class.forName(cn);
     48         } catch (ClassNotFoundException x) {
     49             throw new AssertionError(x);
     50         }
     51         try {
     52             return c.newInstance();
     53         } catch (IllegalAccessException | InstantiationException x) {
     54             throw new AssertionError(x);
     55         }
     56 
     57     }
     58 
     59     /**
     60      * Returns the default AsynchronousChannelProvider.
     61      */
     62     public static AsynchronousChannelProvider create() {
     63         // Android-changed: Android is Linux based.
     64         // String osname = AccessController
     65         //    .doPrivileged(new GetPropertyAction("os.name"));
     66         //
     67         // if (osname.equals("SunOS"))
     68         //     return new SolarisAsynchronousChannelProvider();
     69         // if (osname.equals("Linux"))
     70         return createProvider("sun.nio.ch.LinuxAsynchronousChannelProvider");
     71         // if (osname.contains("OS X"))
     72         //    return new BsdAsynchronousChannelProvider();
     73         // throw new InternalError("platform not recognized");
     74     }
     75 
     76 }
     77