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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [gnu/] [java/] [nio/] [DatagramChannelImpl.java] - Rev 771
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/* DatagramChannelImpl.java -- Copyright (C) 2002, 2003, 2004, 2006 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.DatagramPacket; import java.net.DatagramSocket; import java.net.InetSocketAddress; import java.net.SocketAddress; import java.net.SocketTimeoutException; 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 { private NIODatagramSocket socket; /** * Indicates whether this channel initiated whatever operation * is being invoked on our datagram socket. */ private boolean inChannelOperation; /** * 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; } protected DatagramChannelImpl (SelectorProvider provider) throws IOException { super (provider); socket = new NIODatagramSocket (new PlainDatagramSocketImpl(), this); configureBlocking(true); } public int getNativeFD() { return socket.getPlainDatagramSocketImpl().getNativeFD(); } public DatagramSocket socket () { return socket; } protected void implCloseSelectableChannel () throws IOException { socket.close (); } protected void implConfigureBlocking (boolean blocking) throws IOException { socket.setSoTimeout (blocking ? 0 : NIOConstants.DEFAULT_TIMEOUT); } public DatagramChannel connect (SocketAddress remote) throws IOException { if (!isOpen()) throw new ClosedChannelException(); socket.connect (remote); return this; } public DatagramChannel disconnect () throws IOException { socket.disconnect (); return this; } public boolean isConnected () { return socket.isConnected (); } public int write (ByteBuffer src) throws IOException { if (!isConnected ()) throw new NotYetConnectedException (); return send (src, socket.getRemoteSocketAddress()); } 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(); long result = 0; for (int index = offset; index < offset + length; index++) result += write (srcs [index]); return result; } public int read (ByteBuffer dst) throws IOException { if (!isConnected ()) throw new NotYetConnectedException (); int remaining = dst.remaining(); receive (dst); return remaining - dst.remaining(); } 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(); long result = 0; for (int index = offset; index < offset + length; index++) result += read (dsts [index]); return result; } public SocketAddress receive (ByteBuffer dst) throws IOException { if (!isOpen()) throw new ClosedChannelException(); try { DatagramPacket packet; int len = dst.remaining(); if (dst.hasArray()) { packet = new DatagramPacket (dst.array(), dst.arrayOffset() + dst.position(), len); } else { packet = new DatagramPacket (new byte [len], len); } boolean completed = false; try { begin(); setInChannelOperation(true); socket.receive (packet); completed = true; } finally { end (completed); setInChannelOperation(false); } if (!dst.hasArray()) { dst.put (packet.getData(), packet.getOffset(), packet.getLength()); } else { dst.position (dst.position() + packet.getLength()); } return packet.getSocketAddress(); } catch (SocketTimeoutException e) { return null; } } public int send (ByteBuffer src, SocketAddress target) throws IOException { if (!isOpen()) throw new ClosedChannelException(); if (target instanceof InetSocketAddress && ((InetSocketAddress) target).isUnresolved()) throw new IOException("Target address not resolved"); byte[] buffer; int offset = 0; int len = src.remaining(); if (src.hasArray()) { buffer = src.array(); offset = src.arrayOffset() + src.position(); } else { buffer = new byte [len]; src.get (buffer); } DatagramPacket packet = new DatagramPacket (buffer, offset, len, target); boolean completed = false; try { begin(); setInChannelOperation(true); socket.send(packet); completed = true; } finally { end (completed); setInChannelOperation(false); } if (src.hasArray()) { src.position (src.position() + len); } return len; } }
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