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diff --git a/libjava/classpath/java/nio/channels/FileChannel.java b/libjava/classpath/java/nio/channels/FileChannel.java
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+++ b/libjava/classpath/java/nio/channels/FileChannel.java
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+/* FileChannel.java --
+   Copyright (C) 2002 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.nio.channels;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.MappedByteBuffer;
+import java.nio.channels.spi.AbstractInterruptibleChannel;
+
+
+/**
+ * @author Michael Koch
+ * @since 1.4
+ */
+public abstract class FileChannel extends AbstractInterruptibleChannel
+  implements ByteChannel, GatheringByteChannel, ScatteringByteChannel
+{
+  public static class MapMode
+  {
+    int m;
+    public static final MapMode READ_ONLY = new MapMode(0);
+    public static final MapMode READ_WRITE = new MapMode(1);
+    public static final MapMode PRIVATE = new MapMode(2);
+
+    /**
+     * Initializes the MapMode.
+     */
+    MapMode(int a)
+    {
+      m = a;
+    }
+
+    /**
+     * Returns a string representation of the <code>MapMode</code> object.
+     */
+    public String toString()
+    {
+      if (this == READ_ONLY)
+	return "READ_ONLY";
+      else if (this == READ_WRITE)
+	return "READ_WRITE";
+
+      return "PRIVATE";
+    }
+  }
+
+  /**
+   * Initializes the channel.
+   */
+  protected FileChannel()
+  {
+  }
+
+  /**
+   * Maps the file into the memory.
+   *
+   * @exception IllegalArgumentException If the preconditions on the parameters
+   * do not hold.
+   * @exception IOException If an I/O error occurs.
+   * @exception NonReadableChannelException If mode is READ_ONLY but this channel was
+   * not opened for reading.
+   * @exception NonWritableChannelException If mode is READ_WRITE or PRIVATE but this
+   * channel was not opened for writing.
+   */
+  public abstract MappedByteBuffer map(MapMode mode, long position, long size)
+    throws IOException;
+
+  /**
+   * Return the size of the file thus far
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   */
+  public abstract long size() throws IOException;
+
+  /**
+   * Writes data to the channel.
+   *
+   * @exception IOException If an I/O error occurs.
+   */
+  public final long write(ByteBuffer[] srcs) throws IOException
+  {
+    long result = 0;
+
+    for (int i = 0; i < srcs.length; i++)
+      result += write(srcs[i]);
+
+    return result;
+  }
+
+  /**
+   * Writes data to the channel.
+   *
+   * @exception IOException If an I/O error occurs.
+   */
+  public abstract int write(ByteBuffer src) throws IOException;
+
+  /**
+   * Writes data to the channel.
+   *
+   * @exception AsynchronousCloseException If another thread closes this channel
+   * while the transfer is in progress.
+   * @exception ClosedByInterruptException If another thread interrupts the
+   * current thread while the transfer is in progress, thereby closing both
+   * channels and setting the current thread's interrupt status.
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If position is negative.
+   * @exception IOException If an I/O error occurs.
+   * @exception NonWritableChannelException If this channel was not opened for
+   * writing.
+   */
+  public abstract int write(ByteBuffer srcs, long position)
+    throws IOException;
+
+  /**
+   * Writes data to the channel.
+   *
+   * @exception IOException If an I/O error occurs.
+   */
+  public abstract long write(ByteBuffer[] srcs, int offset, int length)
+    throws IOException;
+
+  /**
+   * Reads data from the channel.
+   *
+   * @exception IOException If an I/O error occurs.
+   */
+  public abstract long read(ByteBuffer[] dsts, int offset, int length)
+    throws IOException;
+
+  /**
+   * Reads data from the channel.
+   *
+   * @exception IOException If an I/O error occurs.
+   */
+  public final long read(ByteBuffer[] dsts) throws IOException
+  {
+    long result = 0;
+
+    for (int i = 0; i < dsts.length; i++)
+      read(dsts[i]);
+
+    return result;
+  }
+
+  /**
+   * Reads data from the channel.
+   *
+   * @exception IOException If an I/O error occurs.
+   */
+  public abstract int read(ByteBuffer dst) throws IOException;
+
+  /**
+   * Reads data from the channel.
+   *
+   * @exception AsynchronousCloseException If another thread closes this channel
+   * while the transfer is in progress.
+   * @exception ClosedByInterruptException If another thread interrupts the
+   * current thread while the transfer is in progress, thereby closing both
+   * channels and setting the current thread's interrupt status.
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If position is negative.
+   * @exception IOException If an I/O error occurs.
+   * @exception NonReadableChannelException If this channel was not opened for
+   * reading.
+   */
+  public abstract int read(ByteBuffer dst, long position)
+    throws IOException;
+
+  /**
+   * Closes the channel.
+   *
+   * This is called from @see close.
+   *
+   * @exception IOException If an I/O error occurs.
+   */
+  protected abstract void implCloseChannel() throws IOException;
+
+  /**
+   * msync with the disk
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IOException If an I/O error occurs.
+   */
+  public abstract void force(boolean metaData) throws IOException;
+
+  /**
+   * Creates a file lock for the whole assoziated file.
+   *
+   * @exception AsynchronousCloseException If another thread closes this channel
+   * while the transfer is in progress.
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception FileLockInterruptionException If the invoking thread is
+   * interrupted while blocked in this method.
+   * @exception IOException If an I/O error occurs.
+   * @exception NonReadableChannelException If shared is true and this channel
+   * was not opened for reading.
+   * @exception NonWritableChannelException If shared is false and this channel
+   * was not opened for writing.
+   * @exception OverlappingFileLockException If a lock that overlaps the
+   * requested region is already held by this Java virtual machine, or if
+   * another thread is already blocked in this method and is attempting to lock
+   * an overlapping region.
+   */
+  public final FileLock lock() throws IOException
+  {
+    return lock(0, Long.MAX_VALUE, false);
+  }
+
+  /**
+   * Creates a file lock for a region of the assoziated file.
+   *
+   * @exception AsynchronousCloseException If another thread closes this channel
+   * while the transfer is in progress.
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception FileLockInterruptionException If the invoking thread is
+   * interrupted while blocked in this method.
+   * @exception IllegalArgumentException If the preconditions on the parameters
+   * do not hold.
+   * @exception IOException If an I/O error occurs.
+   * @exception OverlappingFileLockException If a lock that overlaps the
+   * requested region is already held by this Java virtual machine, or if
+   * another thread is already blocked in this method and is attempting to lock
+   * an overlapping region.
+   * @exception NonReadableChannelException If shared is true and this channel
+   * was not opened for reading.
+   * @exception NonWritableChannelException If shared is false and this channel
+   * was not opened for writing.
+   */
+  public abstract FileLock lock(long position, long size, boolean shared)
+    throws IOException;
+
+  /**
+   * Tries to aqquire alock on the whole assoziated file.
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IOException If an I/O error occurs.
+   * @exception OverlappingFileLockException If a lock that overlaps the
+   * requested region is already held by this Java virtual machine, or if
+   * another thread is already blocked in this method and is attempting to lock
+   * an overlapping region.
+   */
+  public final FileLock tryLock() throws IOException
+  {
+    return tryLock(0, Long.MAX_VALUE, false);
+  }
+
+  /**
+   * Tries to aqquire a lock on a region of the assoziated file.
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If the preconditions on the parameters
+   * do not hold.
+   * @exception IOException If an I/O error occurs.
+   * @exception OverlappingFileLockException If a lock that overlaps the
+   * requested region is already held by this Java virtual machine, or if
+   * another thread is already blocked in this method and is attempting to lock
+   * an overlapping region.
+   */
+  public abstract FileLock tryLock(long position, long size, boolean shared)
+    throws IOException;
+
+  /**
+   * Returns the current position on the file.
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IOException If an I/O error occurs.
+   */
+  public abstract long position() throws IOException;
+
+  /**
+   * Sets the position of the channel on the assoziated file.
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If newPosition is negative.
+   * @exception IOException If an I/O error occurs.
+   */
+  public abstract FileChannel position(long newPosition)
+    throws IOException;
+
+  /**
+   * Transfers bytes from this channel's file to the given writable byte
+   * channel.
+   *
+   * @exception AsynchronousCloseException If another thread closes this channel
+   * while the transfer is in progress.
+   * @exception ClosedByInterruptException If another thread interrupts the
+   * current thread while the transfer is in progress, thereby closing both
+   * channels and setting the current thread's interrupt status.
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If the preconditions on the parameters
+   * do not hold.
+   * @exception IOException If an I/O error occurs.
+   * @exception NonReadableChannelException If this channel was not opened for
+   * reading.
+   * @exception NonWritableChannelException If the target channel was not
+   * opened for writing.
+   */
+  public abstract long transferTo(long position, long count,
+                                  WritableByteChannel target)
+    throws IOException;
+
+  /**
+   * Transfers bytes from the given readable channel into this channel.
+   *
+   * @exception AsynchronousCloseException If another thread closes this channel
+   * while the transfer is in progress.
+   * @exception ClosedByInterruptException If another thread interrupts the
+   * current thread while the transfer is in progress, thereby closing both
+   * channels and setting the current thread's interrupt status.
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If the preconditions on the parameters
+   * do not hold.
+   * @exception IOException If an I/O error occurs.
+   * @exception NonReadableChannelException If the source channel was not
+   * opened for reading.
+   * @exception NonWritableChannelException If this channel was not opened for
+   * writing.
+   */
+  public abstract long transferFrom(ReadableByteChannel src, long position,
+                                    long count) throws IOException;
+
+  /**
+   * Truncates the channel's file at <code>size</code>.
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If size is negative.
+   * @exception IOException If an I/O error occurs.
+   * @exception NonWritableChannelException If this channel was not opened for
+   * writing.
+   */
+  public abstract FileChannel truncate(long size) throws IOException;
+}