xpcom/glue/nsIInterfaceRequestorUtils.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
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  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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  15  * The Original Code is mozilla.org code.
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  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s):
  23  *   Scott Collins <scc@netscape.com>
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  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsIInterfaceRequestor.h"
  40 #include "nsIInterfaceRequestorUtils.h"
  41
  42 nsresult
  43 nsGetInterface::operator()( const nsIID& aIID, void** aInstancePtr ) const
  44 {
  45   nsresult status;
  46
  47   if ( mSource )
  48   {
  49     nsCOMPtr<nsIInterfaceRequestor> factoryPtr = do_QueryInterface(mSource, &status);
  50
  51     if ( factoryPtr )
  52       status = factoryPtr->GetInterface(aIID, aInstancePtr);
  53     else
  54       status = NS_ERROR_NO_INTERFACE;
  55   }
  56   else
  57     status = NS_ERROR_NULL_POINTER;
  58
  59   if ( NS_FAILED(status) )
  60     *aInstancePtr = 0;
  61   if ( mErrorPtr )
  62     *mErrorPtr = status;
  63   return status;
  64 }