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[official-gcc.git] / gomp-20050608-branch / libjava / classpath / java / nio / channels / spi / SelectorProvider.java
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1 /* SelectorProvider.java
2 Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
38 package java.nio.channels.spi;
40 import gnu.java.nio.SelectorProviderImpl;
42 import java.io.IOException;
43 import java.nio.channels.DatagramChannel;
44 import java.nio.channels.Pipe;
45 import java.nio.channels.ServerSocketChannel;
46 import java.nio.channels.SocketChannel;
49 /**
50 * @author Michael Koch
51 * @since 1.4
53 public abstract class SelectorProvider
55 private static SelectorProvider systemDefaultProvider;
57 /**
58 * Initializes the selector provider.
60 * @exception SecurityException If a security manager has been installed and
61 * it denies @see RuntimePermission ("selectorProvider").
63 protected SelectorProvider()
65 SecurityManager sm = System.getSecurityManager();
66 if (sm != null)
67 sm.checkPermission(new RuntimePermission("selectorProvider"));
70 /**
71 * Opens a datagram channel.
73 * @return a new datagram channel object
75 * @exception IOException if an error occurs
77 public abstract DatagramChannel openDatagramChannel()
78 throws IOException;
80 /**
81 * Opens a pipe.
83 * @return a new pipe object
85 * @exception IOException if an error occurs
87 public abstract Pipe openPipe() throws IOException;
89 /**
90 * Opens a selector.
92 * @return a new selector object
94 * @exception IOException if an error occurs
96 public abstract AbstractSelector openSelector() throws IOException;
98 /**
99 * Opens a server socket channel.
101 * @return a new server socket channel object
103 * @exception IOException if an error occurs
105 public abstract ServerSocketChannel openServerSocketChannel()
106 throws IOException;
109 * Opens a socket channel.
111 * @return a new socket channel object
113 * @exception IOException if an error occurs
115 public abstract SocketChannel openSocketChannel() throws IOException;
118 * Returns the system-wide default selector provider for this invocation
119 * of the Java virtual machine.
121 * @return the default seletor provider
123 public static synchronized SelectorProvider provider()
125 if (systemDefaultProvider == null)
127 String propertyValue =
128 System.getProperty("java.nio.channels.spi.SelectorProvider");
130 if (propertyValue == null || propertyValue.equals(""))
131 systemDefaultProvider = new SelectorProviderImpl();
132 else
136 systemDefaultProvider =
137 (SelectorProvider) Class.forName(propertyValue)
138 .newInstance();
140 catch (Exception e)
142 System.err.println("Could not instantiate class: "
143 + propertyValue);
144 systemDefaultProvider = new SelectorProviderImpl();
149 return systemDefaultProvider;