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