Implemented class LazyRequestedEntity

application/symfony/src/Domain/RequestManagement/Entity/LazyRequestedEntity.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace Infinito\Domain\RequestManagement\Entity;
+
+use Infinito\Entity\EntityInterface;
+use Infinito\Attribut\SlugAttributInterface;
+
+/**
+ * This class allows to use the RequestedEntity via LazyLoading
+ * It reduce the ammount of requests which are send to the database.
+ *
+ * @author kevinfrantz
+ */
+class LazyRequestedEntity extends RequestedEntity
+{
+    /**
+     * @var EntityInterface|null Important for lazy loading
+     */
+    private static $lazyLoadedEntity;
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see \Infinito\Domain\RequestManagement\Entity\RequestedEntity::loadEntity()
+     */
+    protected function loadEntity(): ?EntityInterface
+    {
+        return $this->lazyLoadEntity();
+    }
+
+    /**
+     * @return EntityInterface|null
+     */
+    private function lazyLoadEntity(): ?EntityInterface
+    {
+        if ($this->isLazyLoadNeccessary()) {
+            $entity = parent::loadEntity();
+            self::$lazyLoadedEntity = $entity;
+        }
+
+        return self::$lazyLoadedEntity;
+    }
+
+    /**
+     * @return bool
+     */
+    private function isLazyLoadNeccessary(): bool
+    {
+        if (self::$lazyLoadedEntity) {
+            if ($this->hasId()) {
+                return $this->id !== self::$lazyLoadedEntity->getId();
+            }
+            if ($this->hasSlug()) {
+                if (self::$lazyLoadedEntity instanceof SlugAttributInterface) {
+                    return $this->slug !== self::$lazyLoadedEntity->getSlug();
+                }
+            }
+        }
+
+        return true;
+    }
+}