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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [java/] [nio/] [FileLockImpl.java] - Blame information for rev 769

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1 769 jeremybenn
/* FileLockImpl.java -- FileLock associated with a FileChannelImpl.
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   Copyright (C) 2002, 2004, 2005 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 gnu.java.nio;
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import java.io.IOException;
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import java.nio.channels.FileLock;
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/**
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 * A FileLock associated with a FileChannelImpl.
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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 final class FileLockImpl extends FileLock
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{
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  /**
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   * Whether or not this lock is valid, false when channel is closed or
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   * release has been explicitly called.
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   */
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  private boolean valid;
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  public FileLockImpl (FileChannelImpl channel, long position,
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                       long size, boolean shared)
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  {
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    super (channel, position, size, shared);
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    valid = true;
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  }
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  /**
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   * Releases this lock.
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   */
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  protected void finalize()
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  {
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    try
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      {
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        release();
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      }
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    catch (IOException e)
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      {
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        // Ignore this.
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      }
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  }
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  /**
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   * Whether or not this lock is valid, false when channel is closed or
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   * release has been explicitly called.
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   */
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  public boolean isValid()
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  {
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    if (valid)
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      valid = channel().isOpen();
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    return valid;
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  }
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  /**
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   * Releases the lock if it is still valid. Marks this lock as invalid.
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   */
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  public void release() throws IOException
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  {
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    if (isValid())
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      {
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        valid = false;
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        ((FileChannelImpl) channel()).unlock(position(), size());
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      }
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  }
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}

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