Make sure we can start using this TaggingPSRItem without dropping all existing data. (#89)

* Make sure we can start using this TaggingPSRItem without dropping all existing data.

Author: Nyholm

Changelog.md

@@ -3,6 +3,11 @@
 The change log describes what is "Added", "Removed", "Changed" or "Fixed" between each release. 
 
 ## UNRELEASED
+## 0.4.3
+
+### Fixed
+
+* Do not lose the data when you start using the `TaggablePSR6PoolAdapter`
 
 ## 0.4.2
 

TaggablePSR6ItemAdapter.php

@@ -82,9 +82,13 @@ public function get()
     {
         $rawItem = $this->cacheItem->get();
 
-        if (is_array($rawItem) && isset($rawItem['value'])) {
+        // If it is a cache item we created
+        if ($this->isItemCreatedHere($rawItem)) {
             return $rawItem['value'];
         }
+
+        // This is an item stored before we used this fake cache
+        return $rawItem;
     }
 
     /**
@@ -178,12 +182,24 @@ private function initializeTags()
             if ($this->cacheItem->isHit()) {
                 $rawItem = $this->cacheItem->get();
 
-                if (is_array($rawItem) && isset($rawItem['tags'])) {
+                if ($this->isItemCreatedHere($rawItem)) {
                     $this->tags = $rawItem['tags'];
                 }
             }
 
             $this->initialized = true;
         }
     }
+
+    /**
+     * Verify that the raw data is a cache item created by this class.
+     *
+     * @param mixed $rawItem
+     *
+     * @return bool
+     */
+    private function isItemCreatedHere($rawItem)
+    {
+        return is_array($rawItem) && isset($rawItem['value']) && isset($rawItem['tags']) && count($rawItem) === 2;
+    }
 }