/* * Copyright (c) 2007, 2009, 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 java.nio.channels; import java.net.SocketOption;import java.net.SocketAddress;import java.util.Set;import java.io.IOException; /** * A channel to a network socket. * * <p> A channel that implements this interface is a channel to a network * socket. The {@link #bind(SocketAddress) bind} method is used to bind the * socket to a local {@link SocketAddress address}, the {@link #getLocalAddress() * getLocalAddress} method returns the address that the socket is bound to, and * the {@link #setOption(SocketOption,Object) setOption} and {@link * #getOption(SocketOption) getOption} methods are used to set and query socket * options.  An implementation of this interface should specify the socket options * that it supports. * * <p> The {@link #bind bind} and {@link #setOption setOption} methods that do * not otherwise have a value to return are specified to return the network * channel upon which they are invoked. This allows method invocations to be * chained. Implementations of this interface should specialize the return type * so that method invocations on the implementation class can be chained. * * @since 1.7 */ public interface NetworkChannel    extends Channel{    /**     * Binds the channel's socket to a local address.     *     * <p> This method is used to establish an association between the socket and     * a local address. Once an association is established then the socket remains     * bound until the channel is closed. If the {@code local} parameter has the     * value {@code null} then the socket will be bound to an address that is     * assigned automatically.     *     * @param   local     *          The address to bind the socket, or {@code null} to bind the socket     *          to an automatically assigned socket address     *     * @return  This channel     *     * @throws  AlreadyBoundException     *          If the socket is already bound     * @throws  UnsupportedAddressTypeException     *          If the type of the given address is not supported     * @throws  ClosedChannelException     *          If the channel is closed     * @throws  IOException     *          If some other I/O error occurs     * @throws  SecurityException     *          If a security manager is installed and it denies an unspecified     *          permission. An implementation of this interface should specify     *          any required permissions.     *     * @see #getLocalAddress     */    NetworkChannel bind(SocketAddress local) throws IOException;     /**     * Returns the socket address that this channel's socket is bound to, or     * {@code null} if the socket is not bound.     *     * <p> Where the channel is {@link #bind bound} to an Internet Protocol     * socket address then the return value from this method is of type {@link     * java.net.InetSocketAddress}.     *     * @return  The socket address that the socket is bound to, or {@code null}     *          if the channel's socket is not bound     *     * @throws  ClosedChannelException     *          If the channel is closed     * @throws  IOException     *          If an I/O error occurs     */    SocketAddress getLocalAddress() throws IOException;     /**     * Sets the value of a socket option.     *     * @param   name     *          The socket option     * @param   value     *          The value of the socket option. A value of {@code null} may be     *          a valid value for some socket options.     *     * @return  This channel     *     * @throws  UnsupportedOperationException     *          If the socket option is not supported by this channel     * @throws  IllegalArgumentException     *          If the value is not a valid value for this socket option     * @throws  ClosedChannelException     *          If this channel is closed     * @throws  IOException     *          If an I/O error occurs     *     * @see java.net.StandardSocketOptions     */    <T> NetworkChannel setOption(SocketOption<T> name, T value) throws IOException;     /**     * Returns the value of a socket option.     *     * @param   name     *          The socket option     *     * @return  The value of the socket option. A value of {@code null} may be     *          a valid value for some socket options.     *     * @throws  UnsupportedOperationException     *          If the socket option is not supported by this channel     * @throws  ClosedChannelException     *          If this channel is closed     * @throws  IOException     *          If an I/O error occurs     *     * @see java.net.StandardSocketOptions     */    <T> T getOption(SocketOption<T> name) throws IOException;     /**     * Returns a set of the socket options supported by this channel.     *     * <p> This method will continue to return the set of options even after the     * channel has been closed.     *     * @return  A set of the socket options supported by this channel     */    Set<SocketOption<?>> supportedOptions();}