105 lines
3.0 KiB
Java
105 lines
3.0 KiB
Java
/* 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 gnu.java.nio.channels.FileChannelImpl;
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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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