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jeremybenn |
/* DatagramChannel.java --
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.nio.channels;
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import java.io.IOException;
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import java.net.DatagramSocket;
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import java.net.SocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.spi.AbstractSelectableChannel;
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import java.nio.channels.spi.SelectorProvider;
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/**
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* @since 1.4
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*/
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public abstract class DatagramChannel extends AbstractSelectableChannel
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implements ByteChannel, ScatteringByteChannel, GatheringByteChannel
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{
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/**
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* Initializes the channel.
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*/
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protected DatagramChannel(SelectorProvider provider)
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{
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super(provider);
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}
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/**
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* Opens a datagram channel.
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*
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* @exception IOException If an error occurs
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*/
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public static DatagramChannel open() throws IOException
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{
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return SelectorProvider.provider().openDatagramChannel();
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}
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/**
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* Reads data from this channel.
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*/
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public final long read(ByteBuffer[] dsts) throws IOException
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{
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long b = 0;
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for (int i = 0; i < dsts.length; i++)
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b += read(dsts[i]);
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return b;
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}
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/**
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* Writes data to this channel.
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*
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* @exception IOException If an error occurs
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* @exception NotYetConnectedException The channel's socket is not connected.
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*/
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public final long write(ByteBuffer[] srcs) throws IOException
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{
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long b = 0;
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for (int i = 0; i < srcs.length; i++)
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b += write(srcs[i]);
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return b;
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}
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/**
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* Connects this channel's socket.
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*
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* @exception AsynchronousCloseException If another thread closes this channel
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* while the connect operation is in progress.
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* @exception ClosedByInterruptException If another thread interrupts the
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* current thread while the read operation is in progress, thereby closing the
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* channel and setting the current thread's interrupt status.
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* @exception ClosedChannelException If this channel is closed.
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* @exception IOException If an error occurs.
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* @exception SecurityException If a security manager has been installed and
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* it does not permit datagrams to be sent to the given address.
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*/
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public abstract DatagramChannel connect(SocketAddress remote)
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throws IOException;
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/**
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* Disonnects this channel's socket.
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*
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* @exception IOException If an error occurs
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*/
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public abstract DatagramChannel disconnect() throws IOException;
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/**
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* Tells whether or not this channel's socket is connected.
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*
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* @exception NotYetConnectedException The channel's socket is not connected.
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*/
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public abstract boolean isConnected();
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/**
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* Reads data from this channel.
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*/
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public abstract int read(ByteBuffer dst) throws IOException;
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/**
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* Reads data from this channel.
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*
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* @exception IOException If an error occurs.
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* @exception NotYetConnectedException The channel's socket is not connected.
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*/
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public abstract long read(ByteBuffer[] dsts, int offset, int length)
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throws IOException;
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/**
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* Receives a datagram via this channel.
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*
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* @exception AsynchronousCloseException If another thread closes this channel
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* while the connect operation is in progress.
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* @exception ClosedByInterruptException If another thread interrupts the
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* current thread while the read operation is in progress, thereby closing the
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* channel and setting the current thread's interrupt status.
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* @exception ClosedChannelException If this channel is closed.
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* @exception IOException If an error occurs
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* @exception SecurityException If a security manager has been installed and
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* it does not permit datagrams to be sent to the given address.
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*/
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public abstract SocketAddress receive(ByteBuffer dst)
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throws IOException;
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/**
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* Sends a datagram via this channel.
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*
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* @exception AsynchronousCloseException If another thread closes this channel
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* while the connect operation is in progress.
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* @exception ClosedByInterruptException If another thread interrupts the
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* current thread while the read operation is in progress, thereby closing the
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* channel and setting the current thread's interrupt status.
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* @exception ClosedChannelException If this channel is closed.
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* @exception IOException If an error occurs
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* @exception SecurityException If a security manager has been installed and
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* it does not permit datagrams to be sent to the given address.
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*/
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public abstract int send(ByteBuffer src, SocketAddress target)
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throws IOException;
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/**
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* Retrieves the channel's socket.
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*/
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public abstract DatagramSocket socket();
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/**
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* Writes data to this channel.
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*
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* @exception IOException If an error occurs.
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* @exception NotYetConnectedException The channel's socket is not connected.
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*/
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public abstract int write(ByteBuffer src) throws IOException;
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/**
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* Writes data to this channel.
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*
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* @exception IOException If an error occurs.
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* @exception NotYetConnectedException The channel's socket is not connected.
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*/
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public abstract long write(ByteBuffer[] srcs, int offset, int length)
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throws IOException;
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/**
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* Retrieves the valid operations for this channel.
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*
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* @exception NotYetConnectedException The channel's socket is not connected.
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*/
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public final int validOps()
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{
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return SelectionKey.OP_READ | SelectionKey.OP_WRITE;
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}
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}
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