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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 & ~(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();
-}
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