Replace string class names with the ::class attribute.

src/Mapper/Vector/CircleMapper.php

@@ -16,6 +16,7 @@ use Contao\Model;
 use Netzmacht\Contao\Leaflet\Mapper\DefinitionMapper;
 use Netzmacht\Contao\Leaflet\Request\Request;
 use Netzmacht\LeafletPHP\Definition;
+use Netzmacht\LeafletPHP\Definition\Vector\Circle;
 use Netzmacht\LeafletPHP\Definition\Vector\CircleMarker;
 use Netzmacht\LeafletPHP\Value\LatLng;
 
@@ -31,7 +32,7 @@ class CircleMapper extends AbstractVectorMapper
      *
      * @var string
      */
-    protected static $definitionClass = 'Netzmacht\LeafletPHP\Definition\Vector\Circle';
+    protected static $definitionClass = Circle::class;
 
     /**
      * Layer type.

src/Mapper/Vector/CircleMarkerMapper.php

@@ -12,6 +12,8 @@
 
 namespace Netzmacht\Contao\Leaflet\Mapper\Vector;
 
+use Netzmacht\LeafletPHP\Definition\Vector\CircleMarker;
+
 /**
  * Class CircleMarkerMapper maps the database model to the circle marker definition.
  *
@@ -24,7 +26,7 @@ class CircleMarkerMapper extends CircleMapper
      *
      * @var string
      */
-    protected static $definitionClass = 'Netzmacht\LeafletPHP\Definition\Vector\CircleMarker';
+    protected static $definitionClass = CircleMarker::class;
 
     /**
      * Layer type.

src/Mapper/Vector/MultiPolygonMapper.php

@@ -30,7 +30,7 @@ class MultiPolygonMapper extends MultiPolylineMapper
      *
      * @var string
      */
-    protected static $definitionClass = 'Netzmacht\LeafletPHP\Definition\Vector\Polygon';
+    protected static $definitionClass = Polygon::class;
 
     /**
      * Layer type.

src/Mapper/Vector/MultiPolylineMapper.php

@@ -31,7 +31,7 @@ class MultiPolylineMapper extends AbstractVectorMapper
      *
      * @var string
      */
-    protected static $definitionClass = 'Netzmacht\LeafletPHP\Definition\Vector\Polyline';
+    protected static $definitionClass = Polyline::class;
 
     /**
      * Layer type.

src/Mapper/Vector/PolygonMapper.php

@@ -12,6 +12,8 @@
 
 namespace Netzmacht\Contao\Leaflet\Mapper\Vector;
 
+use Netzmacht\LeafletPHP\Definition\Vector\Polygon;
+
 /**
  * Class PolygonMapper maps the database model to the polygon definition.
  *
@@ -24,7 +26,7 @@ class PolygonMapper extends PolylineMapper
      *
      * @var string
      */
-    protected static $definitionClass = 'Netzmacht\LeafletPHP\Definition\Vector\Polygon';
+    protected static $definitionClass = Polygon::class;
 
     /**
      * Layer type.

src/Mapper/Vector/PolylineMapper.php

@@ -31,7 +31,7 @@ class PolylineMapper extends AbstractVectorMapper
      *
      * @var string
      */
-    protected static $definitionClass = 'Netzmacht\LeafletPHP\Definition\Vector\Polyline';
+    protected static $definitionClass = Polyline::class;
 
     /**
      * Layer type.

src/Mapper/Vector/RectangleMapper.php

@@ -15,6 +15,7 @@ namespace Netzmacht\Contao\Leaflet\Mapper\Vector;
 use Contao\Model;
 use Netzmacht\Contao\Leaflet\Mapper\DefinitionMapper;
 use Netzmacht\Contao\Leaflet\Request\Request;
+use Netzmacht\LeafletPHP\Definition\Vector\Rectangle;
 use Netzmacht\LeafletPHP\Value\LatLng;
 use Netzmacht\LeafletPHP\Value\LatLngBounds;
 
@@ -30,7 +31,7 @@ class RectangleMapper extends AbstractVectorMapper
      *
      * @var string
      */
-    protected static $definitionClass = 'Netzmacht\LeafletPHP\Definition\Vector\Rectangle';
+    protected static $definitionClass = Rectangle::class;
 
     /**
      * Layer type.