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diff --git a/libjava/classpath/java/nio/channels/SelectionKey.java b/libjava/classpath/java/nio/channels/SelectionKey.java
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+/* SelectionKey.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;
+
+
+/**
+ * @author Michael Koch
+ * @since 1.4
+ */
+public abstract class SelectionKey
+{
+  public static final int OP_ACCEPT = 16;
+  public static final int OP_CONNECT = 8;
+  public static final int OP_READ = 1;
+  public static final int OP_WRITE = 4;
+  Object attached;
+
+  /**
+   * Initializes the selection key.
+   */
+  protected SelectionKey()
+  {
+  }
+
+  /**
+   * Attaches obj to the key and returns the old attached object.
+   */
+  public final Object attach(Object obj)
+  {
+    Object old = attached;
+    attached = obj;
+    return old;
+  }
+
+  /**
+   * Returns the object attached to the key.
+   */
+  public final Object attachment()
+  {
+    return attached;
+  }
+
+  /**
+   * Tests if the channel attached to this key is ready to accept
+   * a new socket connection.
+   *
+   * @exception CancelledKeyException If this key has been cancelled
+   */
+  public final boolean isAcceptable()
+  {
+    return (readyOps() & OP_ACCEPT) != 0;
+  }
+
+  /**
+   * Tests whether this key's channel has either finished,
+   * or failed to finish, its socket-connection operation.
+   *
+   * @exception CancelledKeyException If this key has been cancelled
+   */
+  public final boolean isConnectable()
+  {
+    return (readyOps() & OP_CONNECT) != 0;
+  }
+
+  /**
+   * Tests if the channel attached to the key is readable.
+   *
+   * @exception CancelledKeyException If this key has been cancelled
+   */
+  public final boolean isReadable()
+  {
+    return (readyOps() & OP_READ) != 0;
+  }
+
+  /**
+   * Tests if the channel attached to the key is writable.
+   *
+   * @exception CancelledKeyException If this key has been cancelled
+   */
+  public final boolean isWritable()
+  {
+    return (readyOps() & OP_WRITE) != 0;
+  }
+
+  /**
+   * Requests that the registration of this key's channel with
+   * its selector be cancelled.
+   */
+  public abstract void cancel();
+
+  /**
+   * return the channel attached to the key.
+   */
+  public abstract SelectableChannel channel();
+
+  /**
+   * Returns the key's interest set.
+   *
+   * @exception CancelledKeyException If this key has been cancelled
+   */
+  public abstract int interestOps();
+
+  /**
+   * Sets this key's interest set to the given value.
+   *
+   * @exception CancelledKeyException If this key has been cancelled
+   * @exception IllegalArgumentException If a bit in the set does not
+   * correspond to an operation that is supported by this key's channel,
+   * that is, if set &amp; ~(channel().validOps()) != 0
+   */
+  public abstract SelectionKey interestOps(int ops);
+
+  /**
+   * Tells whether or not this key is valid.
+   */
+  public abstract boolean isValid();
+
+  /**
+   * Retrieves this key's ready-operation set.
+   *
+   * @exception CancelledKeyException If this key has been cancelled
+   */
+  public abstract int readyOps();
+
+  /**
+   * Returns the selector for which this key was created.
+   */
+  public abstract Selector selector();
+}