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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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8  * particular file as subject to the "Classpath" exception as provided
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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).
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24  */
25 
26 package sun.nio.ch;
27 
28 import java.nio.channels.spi.SelectorProvider;
29 import java.security.AccessController;
30 import sun.security.action.GetPropertyAction;
31 
32 /**
33  * Creates this platform's default SelectorProvider
34  */
35 
36 public class DefaultSelectorProvider {
37 
38     /**
39      * Prevent instantiation.
40      */
DefaultSelectorProvider()41     private DefaultSelectorProvider() { }
42 
43     @SuppressWarnings("unchecked")
createProvider(String cn)44     private static SelectorProvider createProvider(String cn) {
45         Class<SelectorProvider> c;
46         try {
47             c = (Class<SelectorProvider>)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 SelectorProvider.
61      */
create()62     public static SelectorProvider create() {
63         String osname = AccessController
64             .doPrivileged(new GetPropertyAction("os.name"));
65         if (osname.equals("SunOS"))
66             return createProvider("sun.nio.ch.DevPollSelectorProvider");
67         if (osname.equals("Linux"))
68             return createProvider("sun.nio.ch.EPollSelectorProvider");
69         return new sun.nio.ch.PollSelectorProvider();
70     }
71 
72 }
73