Moved cache drivers outside core to extensions (plugins)

plugins/cache-redis/Predis/Configuration/PrefixOption.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Configuration;
+
+use Predis\Command\Processor\KeyPrefixProcessor;
+use Predis\Command\Processor\ProcessorInterface;
+
+/**
+ * Configures a command processor that apply the specified prefix string to a
+ * series of Redis commands considered prefixable.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+class PrefixOption implements OptionInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function filter(OptionsInterface $options, $value)
+    {
+        if ($value instanceof ProcessorInterface) {
+            return $value;
+        }
+
+        return new KeyPrefixProcessor($value);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDefault(OptionsInterface $options)
+    {
+        // NOOP
+    }
+}