novaway / open-graph

     * @return OpenGraphGeneratorBuilder

     * @throws \InvalidArgumentException

     */

    public function addMetadataDir($dir, $namespacePrefix = '')

    {

        if (!is_dir($dir)) {

            throw new \InvalidArgumentException(sprintf('The directory "%s" does not exist.', $dir));

        }

        if (isset($this->metadataDirectories[$namespacePrefix])) {

            throw new \InvalidArgumentException(sprintf('There is already a directory configured for the namespace prefix "%s". Please use replaceMetadataDir() to override directories.', $namespacePrefix));

        }

        $this->metadataDirectories[$namespacePrefix] = $dir;

        return $this;

    }

    /**

     * Adds a map of namespace prefixes to directories.

     * @return OpenGraphGeneratorBuilder

     * @throws \InvalidArgumentException

     */

    public function replaceMetadataDir($dir, $namespacePrefix = '')

    {

        if (!is_dir($dir)) {

            throw new \InvalidArgumentException(sprintf('The directory "%s" does not exist.', $dir));

        }

        if (!isset($this->metadataDirectories[$namespacePrefix])) {

            throw new \InvalidArgumentException(sprintf('There is no directory configured for namespace prefix "%s". Please use addMetadataDir() for adding new directories.', $namespacePrefix));

        }

        $this->metadataDirectories[$namespacePrefix] = $dir;

        return $this;

    }

    /**

     * Create directory