Changed self:: methods to static:: to allow overriding its behaviour

Author: nilportugues

src/Mapping/MappingFactory.php

@@ -30,9 +30,15 @@ class MappingFactory
     const RELATIONSHIPS_KEY = 'relationships';
     const SELF_KEY = 'self';
 
+    /**
+     * @var array
+     */
+    protected static $classProperties = [];
+
     /**
      * @param string $className
      *
+     * @throws MappingException
      * @return Mapping
      *
      * @since 2.0.0
@@ -74,10 +80,6 @@ public static function fromClass($className)
         return static::fromArray($mappedClass);
     }
 
-    /**
-     * @var array
-     */
-    protected static $classProperties = [];
 
     /**
      * @param array $mappedClass