PlFilterOrder is an abstract class, put a default implementation for

export() there.

Signed-off-by: Florent Bruneau <florent.bruneau@polytechnique.org>

diff --git a/classes/plfilter.php b/classes/plfilter.php
index 1a6d525..47abcce 100644 (file)
--- a/classes/plfilter.php
+++ b/classes/plfilter.php
@@ -62,6 +62,11 @@ abstract class PlFilterOrder implements PlExportable
         $this->_tokens = null;
     }
 
+    public function export()
+    {
+        throw new Exception("This instance is not exportable");
+    }
+
     public function toggleDesc()
     {
         $this->desc = !$this->desc;