Add support for removing config settings

source/lib/SihnonFramework/Config.class.php

@@ -153,6 +153,21 @@ class SihnonFramework_Config {
         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);
+    }
+
 };
 
 ?>

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);
+    
 }
 
 ?>

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),
+        ));
+    }
+    
 }
 
 ?>