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+/* DatagramChannelImpl.java --
+ Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.nio;
+
+import gnu.java.net.PlainDatagramSocketImpl;
+import java.io.IOException;
+import java.net.DatagramSocket;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.ClosedChannelException;
+import java.nio.channels.DatagramChannel;
+import java.nio.channels.NotYetConnectedException;
+import java.nio.channels.spi.SelectorProvider;
+
+/**
+ * @author Michael Koch
+ */
+public final class DatagramChannelImpl extends DatagramChannel
+ implements VMChannelOwner
+{
+ private NIODatagramSocket socket;
+ private VMChannel channel;
+
+ /**
+ * Indicates whether this channel initiated whatever operation
+ * is being invoked on our datagram socket.
+ */
+ private boolean inChannelOperation;
+
+ protected DatagramChannelImpl (SelectorProvider provider)
+ throws IOException
+ {
+ super (provider);
+ socket = new NIODatagramSocket (new PlainDatagramSocketImpl(), this);
+ channel = new VMChannel();
+ channel.initSocket(false);
+ configureBlocking(true);
+ }
+
+ /**
+ * Indicates whether our datagram socket should ignore whether
+ * we are set to non-blocking mode. Certain operations on our
+ * socket throw an <code>IllegalBlockingModeException</code> if
+ * we are in non-blocking mode, <i>except</i> if the operation
+ * is initiated by us.
+ */
+ public final boolean isInChannelOperation()
+ {
+ return inChannelOperation;
+ }
+
+ /**
+ * Sets our indicator of whether we are initiating an I/O operation
+ * on our socket.
+ */
+ public final void setInChannelOperation(boolean b)
+ {
+ inChannelOperation = b;
+ }
+
+ public DatagramSocket socket ()
+ {
+ return socket;
+ }
+
+ protected void implCloseSelectableChannel ()
+ throws IOException
+ {
+ channel.close();
+ }
+
+ protected void implConfigureBlocking (boolean blocking)
+ throws IOException
+ {
+ channel.setBlocking(blocking);
+ }
+
+ public DatagramChannel connect (SocketAddress remote)
+ throws IOException
+ {
+ if (!isOpen())
+ throw new ClosedChannelException();
+
+ try
+ {
+ channel.connect((InetSocketAddress) remote, 0);
+ }
+ catch (ClassCastException cce)
+ {
+ throw new IOException("unsupported socked address type");
+ }
+ return this;
+ }
+
+ public DatagramChannel disconnect ()
+ throws IOException
+ {
+ channel.disconnect();
+ return this;
+ }
+
+ public boolean isConnected()
+ {
+ try
+ {
+ return channel.getPeerAddress() != null;
+ }
+ catch (IOException ioe)
+ {
+ return false;
+ }
+ }
+
+ public int write (ByteBuffer src)
+ throws IOException
+ {
+ if (!isConnected ())
+ throw new NotYetConnectedException ();
+
+ return channel.write(src);
+ }
+
+ public long write (ByteBuffer[] srcs, int offset, int length)
+ throws IOException
+ {
+ if (!isConnected())
+ throw new NotYetConnectedException();
+
+ if ((offset < 0)
+ || (offset > srcs.length)
+ || (length < 0)
+ || (length > (srcs.length - offset)))
+ throw new IndexOutOfBoundsException();
+
+ /* We are connected, meaning we will write these bytes to
+ * the host we connected to, so we don't need to explicitly
+ * give the host. */
+ return channel.writeGathering(srcs, offset, length);
+ }
+
+ public int read (ByteBuffer dst)
+ throws IOException
+ {
+ if (!isConnected ())
+ throw new NotYetConnectedException ();
+
+ return channel.read(dst);
+ }
+
+ public long read (ByteBuffer[] dsts, int offset, int length)
+ throws IOException
+ {
+ if (!isConnected())
+ throw new NotYetConnectedException();
+
+ if ((offset < 0)
+ || (offset > dsts.length)
+ || (length < 0)
+ || (length > (dsts.length - offset)))
+ throw new IndexOutOfBoundsException();
+
+ /* Likewise, see the comment int write above. */
+ return channel.readScattering(dsts, offset, length);
+ }
+
+ public SocketAddress receive (ByteBuffer dst)
+ throws IOException
+ {
+ if (!isOpen())
+ throw new ClosedChannelException();
+
+ try
+ {
+ begin();
+ return channel.receive(dst);
+ }
+ finally
+ {
+ end(true);
+ }
+ }
+
+ public int send (ByteBuffer src, SocketAddress target)
+ throws IOException
+ {
+ if (!isOpen())
+ throw new ClosedChannelException();
+
+ if (!(target instanceof InetSocketAddress))
+ throw new IOException("can only send to inet socket addresses");
+
+ InetSocketAddress dst = (InetSocketAddress) target;
+ if (dst.isUnresolved())
+ throw new IOException("Target address not resolved");
+
+ return channel.send(src, dst);
+ }
+
+ public VMChannel getVMChannel()
+ {
+ return channel;
+ }
+}