author | chegar |
Wed, 27 Apr 2016 20:36:02 +0100 | |
changeset 37676 | 24ef455da1b0 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.net.ext; |
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import java.io.FileDescriptor; |
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import java.net.SocketException; |
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import java.net.SocketOption; |
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import java.util.Collections; |
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import java.util.Set; |
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/** |
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* Defines the infrastructure to support extended socket options, beyond those |
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* defined in {@link java.net.StandardSocketOptions}. |
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* |
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* Extended socket options are accessed through the jdk.net API, which is in |
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* the jdk.net module. |
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*/ |
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public abstract class ExtendedSocketOptions { |
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private final Set<SocketOption<?>> options; |
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/** Tells whether or not the option is supported. */ |
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public final boolean isOptionSupported(SocketOption<?> option) { |
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return options().contains(option); |
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} |
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/** Return the, possibly empty, set of extended socket options available. */ |
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public final Set<SocketOption<?>> options() { return options; } |
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/** Sets the value of a socket option, for the given socket. */ |
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public abstract void setOption(FileDescriptor fd, SocketOption<?> option, Object value) |
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throws SocketException; |
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/** Returns the value of a socket option, for the given socket. */ |
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public abstract Object getOption(FileDescriptor fd, SocketOption<?> option) |
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throws SocketException; |
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protected ExtendedSocketOptions(Set<SocketOption<?>> options) { |
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this.options = options; |
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} |
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private static volatile ExtendedSocketOptions instance; |
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public static final ExtendedSocketOptions getInstance() { return instance; } |
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/** Registers support for extended socket options. Invoked by the jdk.net module. */ |
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public static final void register(ExtendedSocketOptions extOptions) { |
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if (instance != null) |
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throw new InternalError("Attempting to reregister extended options"); |
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instance = extOptions; |
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} |
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static { |
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try { |
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// If the class is present, it will be initialized which |
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// triggers registration of the extended socket options. |
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Class<?> c = Class.forName("jdk.net.ExtendedSocketOptions"); |
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} catch (ClassNotFoundException e) { |
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// the jdk.net module is not present => no extended socket options |
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instance = new NoExtendedSocketOptions(); |
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} |
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} |
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static final class NoExtendedSocketOptions extends ExtendedSocketOptions { |
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NoExtendedSocketOptions() { |
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super(Collections.<SocketOption<?>>emptySet()); |
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} |
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@Override |
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public void setOption(FileDescriptor fd, SocketOption<?> option, Object value) |
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throws SocketException |
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{ |
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throw new UnsupportedOperationException( |
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"no extended options: " + option.name()); |
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} |
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@Override |
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public Object getOption(FileDescriptor fd, SocketOption<?> option) |
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throws SocketException |
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{ |
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throw new UnsupportedOperationException( |
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"no extended options: " + option.name()); |
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} |
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} |
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} |