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jeremybenn |
/* SelectionKey.java --
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Copyright (C) 2002, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.nio.channels;
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/**
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* @author Michael Koch
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* @since 1.4
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*/
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public abstract class SelectionKey
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{
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public static final int OP_ACCEPT = 16;
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public static final int OP_CONNECT = 8;
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public static final int OP_READ = 1;
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public static final int OP_WRITE = 4;
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Object attached;
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/**
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* Initializes the selection key.
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*/
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protected SelectionKey()
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{
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}
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/**
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* Attaches obj to the key and returns the old attached object.
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*/
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public final synchronized Object attach(Object obj)
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{
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Object old = attached;
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attached = obj;
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return old;
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}
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/**
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* Returns the object attached to the key.
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*/
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public final synchronized Object attachment()
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{
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return attached;
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}
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/**
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* Tests if the channel attached to this key is ready to accept
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* a new socket connection.
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*
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* @exception CancelledKeyException If this key has been cancelled
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*/
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public final boolean isAcceptable()
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{
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return (readyOps() & OP_ACCEPT) != 0;
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}
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/**
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* Tests whether this key's channel has either finished,
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* or failed to finish, its socket-connection operation.
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*
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* @exception CancelledKeyException If this key has been cancelled
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*/
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public final boolean isConnectable()
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{
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return (readyOps() & OP_CONNECT) != 0;
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}
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/**
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* Tests if the channel attached to the key is readable.
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*
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* @exception CancelledKeyException If this key has been cancelled
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*/
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public final boolean isReadable()
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{
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return (readyOps() & OP_READ) != 0;
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}
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/**
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* Tests if the channel attached to the key is writable.
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*
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* @exception CancelledKeyException If this key has been cancelled
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*/
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public final boolean isWritable()
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{
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return (readyOps() & OP_WRITE) != 0;
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}
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/**
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* Requests that the registration of this key's channel with
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* its selector be cancelled.
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*/
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public abstract void cancel();
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/**
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* return the channel attached to the key.
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*/
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public abstract SelectableChannel channel();
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/**
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* Returns the key's interest set.
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*
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* @exception CancelledKeyException If this key has been cancelled
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*/
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public abstract int interestOps();
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/**
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* Sets this key's interest set to the given value.
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*
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* @exception CancelledKeyException If this key has been cancelled
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* @exception IllegalArgumentException If a bit in the set does not
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* correspond to an operation that is supported by this key's channel,
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* that is, if set & ~(channel().validOps()) != 0
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*/
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public abstract SelectionKey interestOps(int ops);
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/**
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* Tells whether or not this key is valid.
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*/
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public abstract boolean isValid();
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/**
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* Retrieves this key's ready-operation set.
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*
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* @exception CancelledKeyException If this key has been cancelled
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*/
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public abstract int readyOps();
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/**
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* Returns the selector for which this key was created.
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*/
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public abstract Selector selector();
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}
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