--- /dev/null
+/* 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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