From 01d97bface9a38531d1fdb28a78adfeedc174a10 Mon Sep 17 00:00:00 2001
From: Ben Roberts <ben@sihnon.net>
Date: Sun, 28 Aug 2011 16:18:25 +0100
Subject: [PATCH] Add support for removing config settings

---
 source/lib/SihnonFramework/Config.class.php       | 15 +++++++++++++++
 .../SihnonFramework/Config/IUpdateable.class.php  |  8 ++++++++
 .../Config/Plugin/Database.class.php              |  6 ++++++
 3 files changed, 29 insertions(+)

diff --git a/source/lib/SihnonFramework/Config.class.php b/source/lib/SihnonFramework/Config.class.php
index 1c5b71a..4e012c1 100644
--- a/source/lib/SihnonFramework/Config.class.php
+++ b/source/lib/SihnonFramework/Config.class.php
@@ -152,6 +152,21 @@ class SihnonFramework_Config {
         // Persist the setting into the backend
         return $this->backend->add($key, $type, $packed_value);
     }
+    
+    public function remove($key) {
+        if ( ! ($this->backend instanceof Sihnon_Config_IUpdateable)) {
+            throw new Sihnon_Exception_ReadOnlyConfigBackend();
+        }
+        if (!isset($this->settings[$key])) {
+            throw new Sihnon_Exception_UnknownSetting($key);
+        }
+
+        // Remove the setting for this run
+        unset($this->settings[$key]);
+        
+        // Persist the change into the backend
+        return $this->backend->remove($key);
+    }
 
 };
 
diff --git a/source/lib/SihnonFramework/Config/IUpdateable.class.php b/source/lib/SihnonFramework/Config/IUpdateable.class.php
index 1aa5237..76c1b60 100644
--- a/source/lib/SihnonFramework/Config/IUpdateable.class.php
+++ b/source/lib/SihnonFramework/Config/IUpdateable.class.php
@@ -21,6 +21,14 @@ interface SihnonFramework_Config_IUpdateable {
      */
     public function add($key, $type, $value);
     
+    /**
+     * 
+     * Remove a setting
+     * @param string $key
+     * @return bool
+     */
+    public function remove($key);
+    
 }
 
 ?>
\ No newline at end of file
diff --git a/source/lib/SihnonFramework/Config/Plugin/Database.class.php b/source/lib/SihnonFramework/Config/Plugin/Database.class.php
index a5dd2de..dc98509 100644
--- a/source/lib/SihnonFramework/Config/Plugin/Database.class.php
+++ b/source/lib/SihnonFramework/Config/Plugin/Database.class.php
@@ -43,6 +43,12 @@ class SihnonFramework_Config_Plugin_Database extends Sihnon_PluginBase implement
         ));
     }
     
+    public function remove($key) {
+        return $this->database->update("DELETE FROM `{$this->table}` WHERE `name`=:name LIMIT 1", array(
+            array('name' => 'name',  'value' => $key,   'type' => PDO::PARAM_STR),
+        ));
+    }
+    
 }
 
 ?>
\ No newline at end of file