/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIFile;
interface nsIComponentManager;

/**
 * The nsIModule interface.
 */

[scriptable, uuid(7392D032-5371-11d3-994E-00805FD26FEE)]
interface nsIModule : nsISupports
{
    /** 
     * Object Instance Creation
     *
     * Obtains a Class Object from a nsIModule for a given CID and IID pair.  
     * This class object can either be query to a nsIFactory or a may be 
     * query to a nsIClassInfo.
     *
     * @param aCompMgr  : The global component manager
     * @param aClass    : ClassID of object instance requested
     * @param aIID      : IID of interface requested
     * 
     */
    void getClassObject(in nsIComponentManager aCompMgr, 
                        in nsCIDRef aClass,
                        in nsIIDRef aIID,
                        [retval, iid_is(aIID)] out nsQIResult aResult);


    /**
     * One time registration callback
     *
     * When the nsIModule is discovered, this method will be
     * called so that any setup registration can be preformed.
     *
     * @param aCompMgr  : The global component manager
     * @param aLocation : The location of the nsIModule on disk
     * @param aLoaderStr: Opaque loader specific string
     * @param aType     : Loader Type being used to load this module 
     */
    void registerSelf(in nsIComponentManager aCompMgr, 
                      in nsIFile aLocation,
                      in string aLoaderStr, 
                      in string aType);
    /**
     * One time unregistration callback
     *
     * When the nsIModule is being unregistered, this method will be
     * called so that any unregistration can be preformed
     *
     * @param aCompMgr   : The global component manager
     * @param aLocation  : The location of the nsIModule on disk
     * @param aLoaderStr : Opaque loader specific string
     * 
     */
   void unregisterSelf(in nsIComponentManager aCompMgr, 
                        in nsIFile aLocation,
                        in string  aLoaderStr);

   /** 
    * Module load management
    * 
    * @param aCompMgr  : The global component manager
    *
    * @return indicates to the caller if the module can be unloaded.
    * 		Returning PR_TRUE isn't a guarantee that the module will be
    *		unloaded. It constitues only willingness of the module to be
    *		unloaded.  It is very important to ensure that no outstanding 
    *       references to the module's code/data exist before returning 
    *       PR_TRUE. 
    *		Returning PR_FALSE guaratees that the module won't be unloaded.
    */
    boolean canUnload(in nsIComponentManager aCompMgr);
};