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src/java.base/unix/classes/sun/nio/ch/DefaultAsynchronousChannelProvider.java

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rev 14210 : 8154231: Simplify access to System properties from JDK code
Reviewed-by: rriggs


   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         String osname = AccessController
  64             .doPrivileged(new GetPropertyAction("os.name"));
  65         if (osname.equals("SunOS"))
  66             return createProvider("sun.nio.ch.SolarisAsynchronousChannelProvider");
  67         if (osname.equals("Linux"))
  68             return createProvider("sun.nio.ch.LinuxAsynchronousChannelProvider");
  69         if (osname.contains("OS X"))
  70             return createProvider("sun.nio.ch.BsdAsynchronousChannelProvider");
  71         if (osname.equals("AIX"))
  72             return createProvider("sun.nio.ch.AixAsynchronousChannelProvider");
  73         throw new InternalError("platform not recognized");
  74     }
  75 }


   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 }
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