Overview

The Application package includes libraries that are closely tied with the main application object.  The main classes of the application package are listed below.

Joomla Framework Application Package

JApplication

This class represents the Joomla application and is implemented as a factory class providing all application held objects. The front-end JSite class, the admin JAdministrator class and the installation program JInstallation class all extend the JApplication class.

The class contains instances of: the registry (application persistent store); language object; session object; user object; pathway object; and the base URL (which is now derived and not in persistent store).

JEventDispatcher

This is the Joomla! event dispatcher class. It implements the Observable and Singleton design patterns. It registers event handlers and triggers events.

JPathWay

Instances of this class manage pathways (BreadCrumbs).

Environment Folder 

JBrowser

Browser class, provides capability information about the current web client.   Browser identification is performed by examining the HTTP_USER_AGENT  environment variable provided by the web server. 

JRequest

This class serves to provide the Joomla Framework with a common interface to access  request variables.  This includes $_POST, $_GET, and naturally $_REQUEST.  Variables  can be passed through an input filter to avoid injection or returned raw.

JSession

Static class for managing HTTP sessions.  It provides access to session-state values as well as session-level settings and lifetime management methods. Based on the standard PHP session handling mechanism, it provides many more advanced features such as database container, idle and expire timeouts, etc. 

JURI

This class serves two purposes.  First to parse a URI and provide a common interface for the Joomla Framework to access and manipulate a URI.  Second to attain the URI of  the current executing script from the server regardless of server. The class is a Singlton.

Extension Folder 

JModuleHelper

Instances of this class hold data on available modules

JPlugin

Instances of this class hold data on available plugins

JPluginHelper

Instances of this class hold data on available plugins

User Folder 

JAuthenticate

This is the authorization class and it provides an interface for the Joomla authentication system. This is a singleton class. The login and logout functionality are included.

JAuthorization

The class that handles all access authorization.

JUser

This class handles all application interaction with a user. The class is a singleton.