+ /**
+ * Check whether this data factory has any data.
+ * @return boolean
+ */
+ public function hasData() {
+ return false;
+ }
+
+ /**
+ * Return data from the factory.
+ * @return StatsdData[]
+ */
+ public function getData() {
+ return [];
+ }
+
+ /**
+ * Set collection enable status.
+ * @param bool $enabled Will collection be enabled?
+ * @return void
+ */
+ public function setEnabled( $enabled ) {
+ // Nothing to do, null factory is always disabled.
+ }