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+/* FileDescriptor.java -- Opaque file handle class
+ Copyright (C) 1998, 1999, 2000, 2001, 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 java.io;
+
+import gnu.java.nio.channels.FileChannelImpl;
+
+import java.nio.channels.ByteChannel;
+import java.nio.channels.FileChannel;
+
+/**
+ * This class represents an opaque file handle as a Java class. It should
+ * be used only to pass to other methods that expect an object of this
+ * type. No system specific information can be obtained from this object.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @author Tom Tromey (tromey@cygnus.com)
+ * @date September 24, 1998
+ */
+public final class FileDescriptor
+{
+ /**
+ * A <code>FileDescriptor</code> representing the system standard input
+ * stream. This will usually be accessed through the
+ * <code>System.in</code>variable.
+ */
+ public static final FileDescriptor in
+ = new FileDescriptor (FileChannelImpl.in);
+
+ /**
+ * A <code>FileDescriptor</code> representing the system standard output
+ * stream. This will usually be accessed through the
+ * <code>System.out</code>variable.
+ */
+ public static final FileDescriptor out
+ = new FileDescriptor (FileChannelImpl.out);
+
+ /**
+ * A <code>FileDescriptor</code> representing the system standard error
+ * stream. This will usually be accessed through the
+ * <code>System.err</code>variable.
+ */
+ public static final FileDescriptor err
+ = new FileDescriptor (FileChannelImpl.err);
+
+ final ByteChannel channel;
+
+ /**
+ * This method is used to initialize an invalid FileDescriptor object.
+ */
+ public FileDescriptor()
+ {
+ channel = null;
+ }
+
+ /**
+ * This method is used to initialize a FileDescriptor object.
+ */
+ FileDescriptor(ByteChannel channel)
+ {
+ this.channel = channel;
+ }
+
+
+ /**
+ * This method forces all data that has not yet been physically written to
+ * the underlying storage medium associated with this
+ * <code>FileDescriptor</code>
+ * to be written out. This method will not return until all data has
+ * been fully written to the underlying device. If the device does not
+ * support this functionality or if an error occurs, then an exception
+ * will be thrown.
+ */
+ public void sync () throws SyncFailedException
+ {
+ if (channel instanceof FileChannel)
+ {
+ try
+ {
+ ((FileChannel) channel).force(true);
+ }
+ catch (IOException ex)
+ {
+ if (ex instanceof SyncFailedException)
+ throw (SyncFailedException) ex;
+ else
+ throw new SyncFailedException(ex.toString());
+ }
+ }
+ }
+
+ /**
+ * This methods tests whether or not this object represents a valid open
+ * native file handle.
+ *
+ * @return <code>true</code> if this object represents a valid
+ * native file handle, <code>false</code> otherwise
+ */
+ public boolean valid ()
+ {
+ return channel != null && channel.isOpen();
+ }
+}