/* AbstractInterruptibleChannel.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.

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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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
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this exception to your version of the library, but you are not
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package java.nio.channels.spi;

import java.io.IOException;
import java.nio.channels.Channel;
import java.nio.channels.InterruptibleChannel;

public abstract class AbstractInterruptibleChannel
  implements Channel, InterruptibleChannel
{
  boolean opened = false;

  protected AbstractInterruptibleChannel()
  {
  }

  protected final void begin()
  {
    // Marks the beginning of an I/O operation that might block indefinitely.
  }
    
  /**
   * @exception IOException If an error occurs
   */
  public final void close() throws IOException
  {
    // Closes this channel.
    implCloseChannel();
  }

  /**
   * @exception AsynchronousCloseException FIXME
   * @exception ClosedByInterruptException FIXME
   */
  protected final void end(boolean completed)
  {
    // Marks the end of an I/O operation that might block indefinitely.
  }   

  /**
   * @exception IOException If an error occurs
   */
  protected abstract void implCloseChannel() throws IOException;

  public final boolean isOpen()
  {
    // Tells whether or not this channel is open.
    return opened;
  }
}