Method findUpdate

// Note: we don't care about char data in collection because there should be none
/**
 * Finds an update
 *
 * @param   array  $options  Options to use: update_site_id: the unique ID of the update site to look at
 *
 * @return  array|boolean  Update_sites and updates discovered. False on failure
 *
 * @since   1.7.0
 */
public function findUpdate($options)
{
    $response = $this->getUpdateSiteResponse($options);
    if ($response === false) {
        return false;
    }
    $this->xmlParser = xml_parser_create('');
    xml_set_object($this->xmlParser, $this);
    xml_set_element_handler($this->xmlParser, '_startElement', '_endElement');
    if (!xml_parse($this->xmlParser, $response->body)) {
        // If the URL is missing the .xml extension, try appending it and retry loading the update
        if (!$this->appendExtension && substr($this->_url, -4) !== '.xml') {
            $options['append_extension'] = true;
            return $this->findUpdate($options);
        }
        $app = Factory::getApplication();
        $app->getLogger()->warning("Error parsing url: {$this->_url}", array('category' => 'updater'));
        $app->enqueueMessage(Text::sprintf('JLIB_UPDATER_ERROR_COLLECTION_PARSE_URL', $this->_url), 'warning');
        return false;
    }
    // @todo: Decrement the bad counter if non-zero
    return array('update_sites' => $this->update_sites, 'updates' => $this->updates);
}