public function get_topic_data($instance)
{
$topic_data = '';
$topic_file = $this->get_external_xml($instance['resource_indentifier']);
if (!empty($topic_file)) {
$topic_file_path = cc2moodle::$path_to_manifest_folder . DIRECTORY_SEPARATOR . $topic_file;
$topic_file_dir = dirname($topic_file_path);
$topic = $this->load_xml_resource($topic_file_path);
if (!empty($topic)) {
$xpath = cc2moodle::newx_path($topic, cc2moodle::getforumns());
$topic_title = $xpath->query('/dt:topic/title');
$topic_title = !empty($topic_title->item(0)->nodeValue) ? $topic_title->item(0)->nodeValue : 'Untitled Topic';
$topic_text = $xpath->query('/dt:topic/text');
$topic_text = !empty($topic_text->item(0)->nodeValue) ? $this->update_sources($topic_text->item(0)->nodeValue, dirname($topic_file)) : '';
$topic_text = !empty($topic_text) ? str_replace("%24", "\$", $this->include_titles($topic_text)) : '';
if (!empty($topic_title)) {
$topic_data['title'] = $topic_title;
$topic_data['description'] = $topic_text;
}
}
$topic_attachments = $xpath->query('/dt:topic/attachments/attachment/@href');
if ($topic_attachments->length > 0) {
$attachment_html = '';
foreach ($topic_attachments as $file) {
$attachment_html .= $this->generate_attachment_html($this->full_path($file->nodeValue, '/'));
}
$topic_data['description'] = !empty($attachment_html) ? $topic_text . '<p>Attachments:</p>' . $attachment_html : $topic_text;
}
}
return $topic_data;
}