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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

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 * This code is distributed in the hope that it will be useful, but WITHOUT

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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 * accompanied this code).

 *

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package java.nio.channels.spi;

/**

 * Base implementation class for selection keys.

 *

 * <p> This class tracks the validity of the key and implements cancellation.

 *

 * @author Mark Reinhold

 * @author JSR-51 Expert Group

 * @since 1.4

 */

public abstract class AbstractSelectionKey

    extends SelectionKey

{

    /**

     * Initializes a new instance of this class.

     */

    protected AbstractSelectionKey() { }

    public final boolean isValid() {

    }

    void invalidate() {                                 // package-private

    }

    /**

     * Cancels this key.

     *

     * <p> If this key has not yet been cancelled then it is added to its

     * selector's cancelled-key set while synchronized on that set.  </p>

     */

    public final void cancel() {

            }

        }

    }

}