From e905680f9b630a48de95cace73c9646a5e52e673 Mon Sep 17 00:00:00 2001
From: doctrine <doctrine@625475ce-881a-0410-a577-b389adb331d8>
Date: Tue, 4 Jul 2006 23:05:21 +0000
Subject: [PATCH] New component: Doctrine_EventListener_Chain

---
 Doctrine/Configurable.php           |  6 +++-
 Doctrine/EventListener/Chain.php    | 52 +++++++++++++++++++++++++++++
 Doctrine/EventListener/Debugger.php |  1 +
 3 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 Doctrine/EventListener/Chain.php

diff --git a/Doctrine/Configurable.php b/Doctrine/Configurable.php
index 7cd5a393c..07d96468e 100644
--- a/Doctrine/Configurable.php
+++ b/Doctrine/Configurable.php
@@ -118,8 +118,12 @@ abstract class Doctrine_Configurable {
      * @param Doctrine_EventListener $listener
      * @return void
      */
-    final public function setEventListener(Doctrine_EventListener $listener) {
+    final public function setEventListener($listener) {
         $i = Doctrine::ATTR_LISTENER;
+        if( ! ($listener instanceof Doctrine_EventListener) && 
+            ! ($listener instanceof Doctrine_EventListener_Chain))
+            throw new Doctrine_Exception("EventListener must extend Doctrine_EventListener or Doctrine_EventListener_Chain");
+
         $this->attributes[$i] = $listener;
     }
     /**
diff --git a/Doctrine/EventListener/Chain.php b/Doctrine/EventListener/Chain.php
new file mode 100644
index 000000000..e7f85cbc2
--- /dev/null
+++ b/Doctrine/EventListener/Chain.php
@@ -0,0 +1,52 @@
+<?php
+class Doctrine_EvenListener_Chain extends Doctrine_Access {
+    /**
+     * @var array $listeners
+     */
+    private $listeners = array();
+    /**
+     * add
+     *
+     * @param Doctrine_EventListener $listener
+     * @return void
+     */
+    public function add(Doctrine_EventListener $listener) {
+        $this->listeners[] = $listener;
+    }
+    /**
+     * returns a Doctrine_EvenListener on success
+     * and null on failure
+     *
+     * @param mixed $key
+     * @return mixed
+     */
+    public function get($key) {
+        if( ! isset($this->listeners[$key]))
+            return null;
+
+        return $this->listeners[$key];
+    }
+    /**
+     * set
+     * 
+     * @param mixed $key
+     * @param Doctrine_EventListener $listener
+     * @return void
+     */
+    public function set($key, Doctrine_EventListener $listener) {
+        $this->listeners[$key] = $listener;
+    }
+    /**
+     * this method should only be called internally by
+     * doctrine, since it doesn't do any method existence checking
+     *
+     * @param method $method
+     * @param array $args
+     */
+    public function __call($method, $args) {
+        foreach($this->listeners as $listener) {
+            $listener->$method($args[0]);
+        }
+    }
+}
+?>
diff --git a/Doctrine/EventListener/Debugger.php b/Doctrine/EventListener/Debugger.php
index 160aa95bb..2656a5585 100644
--- a/Doctrine/EventListener/Debugger.php
+++ b/Doctrine/EventListener/Debugger.php
@@ -16,6 +16,7 @@ class Doctrine_DebugMessage {
     }
 }
 class Doctrine_EventListener_Debugger extends Doctrine_EventListener {
+
     const EVENT_LOAD            = 1;
     const EVENT_PRELOAD         = 2;
     const EVENT_SLEEP           = 3;