Allow a single object type handler to serve multiple types

wcfsetup/install/files/lib/acp/form/LabelGroupAddForm.class.php

@@ -129,12 +129,13 @@ public function readData()
         // get label object type handlers
         $objectTypes = ObjectTypeCache::getInstance()->getObjectTypes('com.woltlab.wcf.label.objectType');
         foreach ($objectTypes as $objectType) {
-            $this->labelObjectTypes[$objectType->objectTypeID] = $objectType->getProcessor();
-            $this->labelObjectTypes[$objectType->objectTypeID]->setObjectTypeID($objectType->objectTypeID);
-        }
+            $handler = $objectType->getProcessor();
+            \assert($handler instanceof ILabelObjectTypeHandler);
+
+            $container = $handler->getContainerForObjectType($objectType);
 
-        foreach ($this->labelObjectTypes as $objectTypeID => $labelObjectType) {
-            $this->labelObjectTypeContainers[$objectTypeID] = $labelObjectType->getContainer();
+            $this->labelObjectTypes[$objectType->objectTypeID] = $handler;
+            $this->labelObjectTypeContainers[$objectType->objectTypeID] = $container;
         }
 
         parent::readData();

wcfsetup/install/files/lib/system/label/object/type/AbstractLabelObjectTypeHandler.class.php

@@ -2,6 +2,7 @@
 
 namespace wcf\system\label\object\type;
 
+use wcf\data\object\type\ObjectType;
 use wcf\system\SingletonFactory;
 
 /**
@@ -16,36 +17,41 @@ abstract class AbstractLabelObjectTypeHandler extends SingletonFactory implement
     /**
      * label object type container
      * @var LabelObjectTypeContainer
+     * @deprecated 6.2 Use `getContainerForObjectType()` instead.
      */
     public $container;
 
     /**
      * object type id
      * @var int
+     * @deprecated 6.2 Use `getContainerForObjectType()` instead.
      */
     public $objectTypeID = 0;
 
-    /**
-     * @inheritDoc
-     */
+    #[\Override]
     public function setObjectTypeID($objectTypeID)
     {
         $this->objectTypeID = $objectTypeID;
     }
 
-    /**
-     * @inheritDoc
-     */
+    #[\Override]
     public function getObjectTypeID()
     {
         return $this->objectTypeID;
     }
 
-    /**
-     * @inheritDoc
-     */
+    #[\Override]
     public function getContainer()
     {
         return $this->container;
     }
+
+    #[\Override]
+    public function getContainerForObjectType(ObjectType $objectType): LabelObjectTypeContainer
+    {
+        // This exists for backwards-compatibility only; Implementations are
+        // expected to implement this method themselves.
+        $this->setObjectTypeID($objectType->objectTypeID);
+        return $this->getContainer();
+    }
 }

wcfsetup/install/files/lib/system/label/object/type/ILabelObjectTypeHandler.class.php

@@ -2,6 +2,8 @@
 
 namespace wcf\system\label\object\type;
 
+use wcf\data\object\type\ObjectType;
+
 /**
  * Every label object type handler has to implement this interface.
  *
@@ -11,25 +13,38 @@
  */
 interface ILabelObjectTypeHandler
 {
+    /**
+     * Provides a container object that groups all objects that can be assigned
+     * a label group.
+     *
+     * Implementations must not rely on any state provided by `getObjectTypeID()`.
+     *
+     * @since 6.2
+     */
+    public function getContainerForObjectType(ObjectType $objectType): LabelObjectTypeContainer;
+
     /**
      * Sets object type id.
      *
      * @param int $objectTypeID
      * @return void
+     * @deprecated 6.2 Use `getContainerForObjectType()` instead.
      */
     public function setObjectTypeID($objectTypeID);
 
     /**
      * Returns object type id.
      *
      * @return  int
+     * @deprecated 6.2 Use `getContainerForObjectType()` instead.
      */
     public function getObjectTypeID();
 
     /**
      * Returns a label object type container.
      *
      * @return  LabelObjectTypeContainer
+     * @deprecated 6.2 Use `getContainerForObjectType()` instead.
      */
     public function getContainer();