protected function _getPaths()
    {
        $directories = $this->_createDirectoryIterator($this->_getRootDir());
        $flattened   = $this->_createRecursiveIteratorIterator($directories);
        $flattened->setMaxDepth($this->_getMaxDepth());
        $filter = $this->_createFilterIterator($flattened, function (SplFileInfo $current, $key, Iterator $iterator) {
            return $this->_filterFile($current);
        });

        return $filter;
    }