DataFile(File file,
    int number) 
{
        this.file = file;
        this.number = Integer.valueOf(number);
        length = file.exists() ? file.length() : 0;
}

 synchronized  void close() throws IOException 
{
        if (randomAcessFile != null) {
            randomAcessFile.close();
        }
}

 synchronized int decrement() 
{
        return --referenceCount;
}

 synchronized boolean delete() throws IOException 
{
        purge();
        return file.delete();
}

 synchronized long getLength() 
{
        return length;
}

 Integer getNumber() 
{
        return number;
}

 synchronized RandomAccessFile getRandomAccessFile() throws FileNotFoundException 
{
        if (randomAcessFile == null) {
            randomAcessFile = new RandomAccessFile(file, "rw");
        }
        return randomAcessFile;
}

 public synchronized Object getWriterData() 
{
        return writerData;
}

 synchronized int increment() 
{
        return ++referenceCount;
}

 synchronized  void incrementLength(int size) 
{
        length += size;
}

 public synchronized boolean isDirty() 
{
        return dirty;
}

 synchronized boolean isUnused() 
{
        return referenceCount < = 0;
}

 synchronized  void purge() throws IOException 
{
        if (randomAcessFile != null) {
            randomAcessFile.close();
            randomAcessFile = null;
        }
}

 public synchronized  void setDirty(boolean value) 
{
        this.dirty = value;
}

 public synchronized  void setWriterData(Object writerData) 
{
        this.writerData = writerData;
        dirty = true;
}

 public String toString() 
{
        String result = file.getName() + " number = " + number + " , length = " + length + " refCount = " + referenceCount;
        return result;
}