/**
* Get an extension by Id. If the extension is not yet loaded, it will be
* loaded using common_ext_Extension::load.
*
* @access public
* @author Joel Bout, <*****@*****.**>
* @param string id The id of the extension.
* @return common_ext_Extension A common_ext_Extension instance or null if it does not exist.
* @throws common_ext_ExtensionException If the provided id is empty.
*/
public function getExtensionById($id)
{
if (!is_string($id) || strlen($id) == 0) {
throw new common_ext_ExtensionException('No id specified for getExtensionById()');
}
if (!isset($this->extensions[$id])) {
$ext = new common_ext_Extension($id, false);
// loads the extension if it hasn't been loaded yet
$ext->load();
// if successfully loaded add to list
$this->extensions[$id] = $ext;
}
return $this->extensions[$id];
}
