SAAS-505: Extract Amazon_S3 class and have it inherit from a general 'cloud backend' class

airtime_mvc/application/cloud_storage/ProxyStorageBackend.php

@@ -0,0 +1,44 @@
+<?php
+
+require_once 'StorageBackend.php';
+require_once 'Amazon_S3.php';
+
+/**
+ * 
+ * Controls access to the storage backend class where a file is stored.
+ *
+ */
+class ProxyStorageBackend extends StorageBackend
+{
+    private $storageBackend;
+    
+    /**
+     * Receives the file's storage backend and instantiates the approriate
+     * object.
+     */
+    public function ProxyStorageBackend($storageBackend)
+    {
+        $this->storageBackend = new $storageBackend();
+    }
+    
+    public function getAbsoluteFilePath($resourceId)
+    {
+        return $this->storageBackend->getAbsoluteFilePath($resourceId);
+    }
+    
+    public function getSignedURL($resourceId)
+    {
+        return $this->storageBackend->getSignedURL($resourceId);
+    }
+    
+    public function getFileSize($resourceId)
+    {
+        return $this->storageBackend->getFileSize($resourceId);
+    }
+    
+    public function deletePhysicalFile($resourceId)
+    {
+        $this->storageBackend->deletePhysicalFile($resourceId);
+    }
+
+}