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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/nio/DatagramChannelImpl.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/nio/DatagramChannelImpl.java')
-rw-r--r-- | libjava/classpath/gnu/java/nio/DatagramChannelImpl.java | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/nio/DatagramChannelImpl.java b/libjava/classpath/gnu/java/nio/DatagramChannelImpl.java new file mode 100644 index 000000000..1132796dd --- /dev/null +++ b/libjava/classpath/gnu/java/nio/DatagramChannelImpl.java @@ -0,0 +1,240 @@ +/* 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; + } +} |