Moved duplicated code to a trait.

Author: ndobromirov

PrefixedCachePool.php

@@ -21,16 +21,13 @@
  */
 class PrefixedCachePool implements CacheItemPoolInterface
 {
+    use PrefixedUtilityTrait;
+
     /**
      * @type CacheItemPoolInterface
      */
     private $cachePool;
 
-    /**
-     * @type string
-     */
-    private $prefix;
-
     /**
      * @param CacheItemPoolInterface $cachePool
      * @param string                 $prefix
@@ -41,26 +38,6 @@ public function __construct(CacheItemPoolInterface $cachePool, $prefix)
         $this->prefix    = $prefix;
     }
 
-    /**
-     * Add namespace prefix on the key.
-     *
-     * @param array $keys
-     */
-    private function prefixValue(&$key)
-    {
-        $key = $this->prefix.$key;
-    }
-
-    /**
-     * @param array $keys
-     */
-    private function prefixValues(array &$keys)
-    {
-        foreach ($keys as &$key) {
-            $this->prefixValue($key);
-        }
-    }
-
     /**
      * {@inheritdoc}
      */

PrefixedSimpleCache.php

@@ -1,6 +1,7 @@
 <?php
 
-/*
+/**
+ * @file
  * This file is part of php-cache organization.
  *
  * (c) 2015 Aaron Scherer <[email protected]>, Tobias Nyholm <[email protected]>
@@ -22,16 +23,13 @@
  */
 class PrefixedSimpleCache implements CacheInterface
 {
+    use PrefixedUtilityTrait;
+
     /**
      * @type CacheInterface
      */
     private $cache;
 
-    /**
-     * @type string
-     */
-    private $prefix;
-
     /**
      * @param CacheInterface $simpleCache
      * @param string         $prefix
@@ -42,26 +40,6 @@ public function __construct(CacheInterface $simpleCache, $prefix)
         $this->prefix = $prefix;
     }
 
-    /**
-     * Add namespace prefix on the key.
-     *
-     * @param array $keys
-     */
-    private function prefixValue(&$key)
-    {
-        $key = $this->prefix.$key;
-    }
-
-    /**
-     * @param array $keys
-     */
-    private function prefixValues(array &$keys)
-    {
-        foreach ($keys as &$key) {
-            $this->prefixValue($key);
-        }
-    }
-
     /**
      * {@inheritdoc}
      */

PrefixedUtilityTrait.php

@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * @file
+ * This file is part of php-cache organization.
+ *
+ * (c) 2015 Aaron Scherer <[email protected]>, Tobias Nyholm <[email protected]>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Cache\Prefixed;
+
+/**
+ * Utility to reduce code suplication between the Prefixed* decoratrs.
+ *
+ * @author ndobromirov
+ */
+trait PrefixedUtilityTrait
+{
+    /**
+     * @type string Prefix to use for key namespaceing.
+     */
+    private $prefix;
+
+    /**
+     * Add namespace prefix on the key.
+     *
+     * @param array $keys Reference to the key. It is mutated.
+     */
+    private function prefixValue(&$key)
+    {
+        $key = $this->prefix.$key;
+    }
+
+    /**
+     * Adds a namespace prefix on a list of keys.
+     *
+     * @param array $keys Reference to the list of keys. The list is mutated.
+     */
+    private function prefixValues(array &$keys)
+    {
+        foreach ($keys as &$key) {
+            $this->prefixValue($key);
+        }
+    }
+}