Introduce interface Icinga\Data\FilterColumns

refs #9029

library/Icinga/Data/FilterColumns.php

@@ -0,0 +1,21 @@
+<?php
+/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Data;
+
+interface FilterColumns
+{
+    /**
+     * Return a filterable's filter columns with their optional label as key
+     *
+     * @return  array
+     */
+    public function getFilterColumns();
+
+    /**
+     * Return a filterable's search columns
+     *
+     * @return  array
+     */
+    public function getSearchColumns();
+}