private function _loadFile($pKey)
    {
        $file = (isset($this->_paths[$pKey])) ? $this->_paths[$pKey] : $this->_getFilePath($pKey);
        if (isset($this->_files[$file])) {
            return $file;
        }

        $this->_createFile($file);
        $this->_files[$file] = json_decode(file_get_contents($file), true);

        return $file;
    }