add optional countUsersInGroup method to group backends

lib/private/group/backend.php

@@ -34,6 +34,7 @@ define('OC_GROUP_BACKEND_DELETE_GROUP',      0x00000010);
 define('OC_GROUP_BACKEND_ADD_TO_GROUP',      0x00000100);
 define('OC_GROUP_BACKEND_REMOVE_FROM_GOUP',  0x00001000);
 define('OC_GROUP_BACKEND_GET_DISPLAYNAME',   0x00010000);
+define('OC_GROUP_BACKEND_COUNT_USERS',       0x00100000);
 
 /**
  * Abstract base class for user management
@@ -45,6 +46,7 @@ abstract class OC_Group_Backend implements OC_Group_Interface {
 		OC_GROUP_BACKEND_ADD_TO_GROUP => 'addToGroup',
 		OC_GROUP_BACKEND_REMOVE_FROM_GOUP => 'removeFromGroup',
 		OC_GROUP_BACKEND_GET_DISPLAYNAME => 'displayNamesInGroup',
+		OC_GROUP_BACKEND_COUNT_USERS => 'countUsersInGroup',
 	);
 
 	/**

lib/private/group/database.php

@@ -211,6 +211,20 @@ class OC_Group_Database extends OC_Group_Backend {
 		return $users;
 	}
 
+	/**
+	 * @brief get the number of all users matching the search string in a group
+	 * @param string $gid
+	 * @param string $search
+	 * @param int $limit
+	 * @param int $offset
+	 * @return int | false
+	 */
+	public function countUsersInGroup($gid, $search = '') {
+		$stmt = OC_DB::prepare('SELECT COUNT(`uid`) AS `count` FROM `*PREFIX*group_user` WHERE `gid` = ? AND `uid` LIKE ?');
+		$result = $stmt->execute(array($gid, $search.'%'));
+		return $result->fetchOne();
+	}
+
 	/**
 	 * @brief get a list of all display names in a group
 	 * @param string $gid

lib/private/group/dummy.php

@@ -157,4 +157,14 @@ class OC_Group_Dummy extends OC_Group_Backend {
 		}
 	}
 
+	/**
+	 * @brief get the number of all users in a group
+	 * @returns int | bool
+	 */
+	public function countUsersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
+		if(isset($this->groups[$gid])) {
+			return count($this->groups[$gid]);
+		}
+	}
+
 }

lib/private/group/group.php

@@ -186,6 +186,27 @@ class Group {
 		return array_values($users);
 	}
 
+	/**
+	 * returns the number of users matching the search string
+	 *
+	 * @param string $search
+	 * @return int | bool
+	 */
+	public function count($search) {
+		$users = false;
+		foreach ($this->backends as $backend) {
+			if(method_exists($backend, 'countUsersInGroup')) {
+				if($users === false) {
+					//we could directly add to a bool variable, but this would
+					//be ugly
+					$users = 0;
+				}
+				$users += $backend->countUsersInGroup($this->gid, $search);
+			}
+		}
+		return $users;
+	}
+
 	/**
 	 * search for users in the group by displayname
 	 *