/**
* Return a link to the atom feeder
*
* In $params you can specify a query to perform, a date field or leave it
* blank to use the default behavior (that is use the $creation_field).
*
* The default behaviour is to keep the last three days or
* (for empty result set) the last ten records.
*/
protected function tagAtom($params)
{
$failed = TIP_Application::getGlobal('fatal_uri');
$template =& TIP_Type::singleton(array('type' => array('template'), 'path' => array($this->id, $this->atom_template)));
if (!$template) {
return $failed;
}
// Check for cache presence
if (!is_null($uri = $this->engine->getCacheUri($template))) {
return $uri;
}
// Check for usable cache path
$path = $this->engine->buildCachePath($template);
$dir = dirname($path);
if (!is_dir($dir) && !mkdir($dir, 0777, true)) {
return $failed;
}
// To make life easier, $params will be a query if contains a space
if (strpos($params, ' ') !== false) {
// $params is a query
if (is_null($view =& $this->startDataView($params, array('fields' => null)))) {
return $failed;
}
} else {
// $params is a field or it is empty
$date_field = empty($params) ? $this->creation_field : $params;
// Check for the last 3 days interval
$query = $this->data->filter($date_field, array('NOW() - INTERVAL 3 DAY'), '>');
if (is_null($view =& $this->startDataView($query, array('fields' => null)))) {
return $failed;
}
if ($view->nRows() <= 0) {
// Empty result set: get the last 10 rows
$this->endView();
$query = $this->data->order($date_field, true);
$query .= $this->data->limit(10);
if (is_null($view =& $this->startDataView($query, array('fields' => null)))) {
return $failed;
}
}
}
if ($view->nRows() <= 0) {
$this->endView();
return $failed;
}
ob_start();
if (!$template->run($this) || !$this->endView()) {
ob_end_clean();
return $failed;
}
// Store the cached atom feed
if (!file_put_contents($path, ob_get_clean(), LOCK_EX)) {
return $failed;
}
return $this->engine->getCacheUri($template);
}
