From 36e0de1cf076d195969e6fe3c97b8bde2eb643b7 Mon Sep 17 00:00:00 2001
From: Christoph Hochstrasser <christoph.hochstrasser@gmail.com>
Date: Thu, 2 May 2013 15:19:12 +0200
Subject: [PATCH] Bring prepend() in line with register()

---
 lib/Pipe/Util/ProcessorRegistry.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Pipe/Util/ProcessorRegistry.php b/lib/Pipe/Util/ProcessorRegistry.php
index ec32004..6ca114c 100644
--- a/lib/Pipe/Util/ProcessorRegistry.php
+++ b/lib/Pipe/Util/ProcessorRegistry.php
@@ -9,8 +9,8 @@ class ProcessorRegistry
 
     function prepend($mimeType, $processor)
     {
-        if (!class_exists($processor)) {
-            throw new \InvalidArgumentException("Class $processor is not defined");
+        if (!class_exists($processor) and !is_callable($processor)) {
+            throw new \InvalidArgumentException("Processor must be either a factory callback or a class name");
         }
 
         if (empty($this->processors[$mimeType])) {