/*
* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* 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.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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*/
package com.sun.xml.internal.org.jvnet.mimepull;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
/**
* Removing files based on this
* <a href="http://java.sun.com/developer/technicalArticles/javase/finalization/">article</a>
*
* @author Jitendra Kotamraju
*/
final class WeakDataFile extends WeakReference<DataFile> {
private static final Logger LOGGER = Logger.getLogger(WeakDataFile.class.getName());
private static final int MAX_ITERATIONS = 2;
private static ReferenceQueue<DataFile> refQueue = new ReferenceQueue<DataFile>();
private static List<WeakDataFile> refList = new ArrayList<WeakDataFile>();
private final File file;
private final RandomAccessFile raf;
WeakDataFile(DataFile df, File file) {
super(df, refQueue);
refList.add(this);
this.file = file;
try {
raf = new RandomAccessFile(file, "rw");
} catch(IOException ioe) {
throw new MIMEParsingException(ioe);
}
drainRefQueueBounded();
}
synchronized void read(long pointer, byte[] buf, int offset, int length ) {
try {
raf.seek(pointer);
raf.readFully(buf, offset, length);
} catch(IOException ioe) {
throw new MIMEParsingException(ioe);
}
}
synchronized long writeTo(long pointer, byte[] data, int offset, int length) {
try {
raf.seek(pointer);
raf.write(data, offset, length);
return raf.getFilePointer(); // Update pointer for next write
} catch(IOException ioe) {
throw new MIMEParsingException(ioe);
}
}
void close() {
LOGGER.fine("Deleting file = "+file.getName());
refList.remove(this);
try {
raf.close();
file.delete();
} catch(IOException ioe) {
throw new MIMEParsingException(ioe);
}
}
void renameTo(File f) {
LOGGER.fine("Moving file="+file+" to="+f);
refList.remove(this);
try {
raf.close();
file.renameTo(f);
} catch(IOException ioe) {
throw new MIMEParsingException(ioe);
}
}
static void drainRefQueueBounded() {
int iterations = 0;
WeakDataFile weak = (WeakDataFile) refQueue.poll();
while (weak != null && iterations < MAX_ITERATIONS) {
LOGGER.fine("Cleaning file = "+weak.file+" from reference queue.");
weak.close();
++iterations;
weak = (WeakDataFile) refQueue.poll();
}
}
}