@Override
        public boolean equals(Object obj) {
            if(obj == null) return false;
            if(obj == this) return true;
            if(obj.getClass().equals(this.getClass())) {
                FileRecord other = (FileRecord)obj;
                return other.file.equals(this.file) && other.group.equals(this.group);
            }
            return false;
        }