Check that the specified file looks like a directory containing many
        pdf files

def can_import(self, file_uris, current_doc=None):
        """
        Check that the specified file looks like a directory containing many
        pdf files
        """
        if len(file_uris) <= 0:
            return False
        try:
            for file_uri in file_uris:
                file_uri = self.fs.safe(file_uri)
                for child in self.fs.recurse(file_uri):
                    if self.check_file_type(child):
                        return True
        except GLib.GError:
            pass
        return False