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lightning-sunbird  0.9+nobinonly
nsIInterfaceRequestorUtils.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Scott Collins <scc@netscape.com>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsIInterfaceRequestor.h"
00040 #include "nsIInterfaceRequestorUtils.h"
00041 
00042 nsresult
00043 nsGetInterface::operator()( const nsIID& aIID, void** aInstancePtr ) const
00044 {
00045        nsresult status;
00046 
00047        if ( mSource )
00048               {
00049                      nsCOMPtr<nsIInterfaceRequestor> factoryPtr = do_QueryInterface(mSource, &status);
00050                      NS_ASSERTION(factoryPtr, "Did you know you were calling |do_GetInterface()| on an object that doesn't support the |nsIInterfaceRequestor| interface?");
00051 
00052                      if ( factoryPtr )
00053                             status = factoryPtr->GetInterface(aIID, aInstancePtr);
00054 
00055                      if ( NS_FAILED(status) )
00056                             *aInstancePtr = 0;
00057               }
00058        else
00059               status = NS_ERROR_NULL_POINTER;
00060 
00061        if ( mErrorPtr )
00062               *mErrorPtr = status;
00063        return status;
00064 }