CompatController: Add getFilter method

src/Compat/CompatController.php

@@ -12,10 +12,12 @@
 use ipl\Html\ValidHtml;
 use ipl\Orm\Query;
 use ipl\Stdlib\Contract\Paginatable;
+use ipl\Stdlib\Filter;
 use ipl\Web\Control\LimitControl;
 use ipl\Web\Control\PaginationControl;
 use ipl\Web\Control\SearchBar;
 use ipl\Web\Control\SortControl;
+use ipl\Web\Filter\QueryString;
 use ipl\Web\Layout\Content;
 use ipl\Web\Layout\Controls;
 use ipl\Web\Layout\Footer;
@@ -44,6 +46,9 @@ class CompatController extends Controller
     /** @var array */
     protected $parts;
 
+    /** @var Filter\Rule */
+    protected $filter;
+
     protected function prepareInit()
     {
         parent::prepareInit();
@@ -509,4 +514,18 @@ public function postDispatch()
 
         parent::postDispatch();
     }
+
+    /**
+     * Get the filter created from query string parameters
+     *
+     * @return Filter\Rule
+     */
+    public function getFilter(): Filter\Rule
+    {
+        if ($this->filter === null) {
+            $this->filter = QueryString::parse((string) $this->params);
+        }
+
+        return $this->filter;
+    }
 }