public function getItemPath($name)
    {
        $lowerName = strtolower($name);
        foreach ([
             $this->classes,
             $this->interfaces,
             $this->traits,
         ] as $source) {
            if (isset($source[$lowerName]) && file_exists($source[$lowerName])) {
                return $source[$lowerName];
            }
        }
        return null;
    }