xpcom/base/nsInterfaceRequestorAgg.cpp

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Mozilla Public License Version
   5  * 1.1 (the "License"); you may not use this file except in compliance with
   6  * the License. You may obtain a copy of the License at
   7  * http://www.mozilla.org/MPL/
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   9  * Software distributed under the License is distributed on an "AS IS" basis,
  10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11  * for the specific language governing rights and limitations under the
  12  * License.
  13  *
  14  * The Original Code is Mozilla.
  15  *
  16  * The Initial Developer of the Original Code is IBM Corporation.
  17  * Portions created by IBM Corporation are Copyright (C) 2004
  18  * IBM Corporation. All Rights Reserved.
  19  *
  20  * Contributor(s):
  21  *   Darin Fisher <darin@meer.net>
  22  *
  23  * Alternatively, the contents of this file may be used under the terms of
  24  * either the GNU General Public License Version 2 or later (the "GPL"), or
  25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  26  * in which case the provisions of the GPL or the LGPL are applicable instead
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  32  * the provisions above, a recipient may use your version of this file under
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  35  * ***** END LICENSE BLOCK ***** */
  36
  37 #include "nsInterfaceRequestorAgg.h"
  38 #include "nsCOMPtr.h"
  39
  40 class nsInterfaceRequestorAgg : public nsIInterfaceRequestor
  41 {
  42 public:
  43   NS_DECL_ISUPPORTS
  44   NS_DECL_NSIINTERFACEREQUESTOR
  45
  46   nsInterfaceRequestorAgg(nsIInterfaceRequestor *aFirst,
  47                           nsIInterfaceRequestor *aSecond)
  48     : mFirst(aFirst)
  49     , mSecond(aSecond) {}
  50
  51   nsCOMPtr<nsIInterfaceRequestor> mFirst, mSecond;
  52 };
  53
  54 // XXX This needs to support threadsafe refcounting until we fix bug 243591.
  55 NS_IMPL_THREADSAFE_ISUPPORTS1(nsInterfaceRequestorAgg, nsIInterfaceRequestor)
  56
  57 NS_IMETHODIMP
  58 nsInterfaceRequestorAgg::GetInterface(const nsIID &aIID, void **aResult)
  59 {
  60   nsresult rv = NS_ERROR_NO_INTERFACE;
  61   if (mFirst)
  62     rv = mFirst->GetInterface(aIID, aResult);
  63   if (mSecond && NS_FAILED(rv))
  64     rv = mSecond->GetInterface(aIID, aResult);
  65   return rv;
  66 }
  67
  68 nsresult
  69 NS_NewInterfaceRequestorAggregation(nsIInterfaceRequestor *aFirst,
  70                                     nsIInterfaceRequestor *aSecond,
  71                                     nsIInterfaceRequestor **aResult)
  72 {
  73   *aResult = new nsInterfaceRequestorAgg(aFirst, aSecond);
  74   if (!*aResult)
  75     return NS_ERROR_OUT_OF_MEMORY;
  76   NS_ADDREF(*aResult);
  77   return NS_OK;
  78 }