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lightning-sunbird  0.9+nobinonly
nsInterfaceRequestorAgg.cpp
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is Mozilla.
00015  *
00016  * The Initial Developer of the Original Code is IBM Corporation.
00017  * Portions created by IBM Corporation are Copyright (C) 2004
00018  * IBM Corporation. All Rights Reserved.
00019  *
00020  * Contributor(s):
00021  *   Darin Fisher <darin@meer.net>
00022  *
00023  * Alternatively, the contents of this file may be used under the terms of
00024  * either the GNU General Public License Version 2 or later (the "GPL"), or
00025  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00026  * in which case the provisions of the GPL or the LGPL are applicable instead
00027  * of those above. If you wish to allow use of your version of this file only
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00034  *
00035  * ***** END LICENSE BLOCK ***** */
00036 
00037 #include "nsInterfaceRequestorAgg.h"
00038 #include "nsCOMPtr.h"
00039 
00040 class nsInterfaceRequestorAgg : public nsIInterfaceRequestor
00041 {
00042 public:
00043   NS_DECL_ISUPPORTS
00044   NS_DECL_NSIINTERFACEREQUESTOR
00045 
00046   nsInterfaceRequestorAgg(nsIInterfaceRequestor *aFirst,
00047                           nsIInterfaceRequestor *aSecond)
00048     : mFirst(aFirst)
00049     , mSecond(aSecond) {}
00050 
00051   nsCOMPtr<nsIInterfaceRequestor> mFirst, mSecond;
00052 };
00053 
00054 // XXX This needs to support threadsafe refcounting until we fix bug 243591.
00055 NS_IMPL_THREADSAFE_ISUPPORTS1(nsInterfaceRequestorAgg, nsIInterfaceRequestor)
00056 
00057 NS_IMETHODIMP
00058 nsInterfaceRequestorAgg::GetInterface(const nsIID &aIID, void **aResult)
00059 {
00060   nsresult rv = NS_ERROR_NO_INTERFACE;
00061   if (mFirst)
00062     rv = mFirst->GetInterface(aIID, aResult);
00063   if (mSecond && NS_FAILED(rv))
00064     rv = mSecond->GetInterface(aIID, aResult);
00065   return rv;
00066 }
00067 
00068 nsresult
00069 NS_NewInterfaceRequestorAggregation(nsIInterfaceRequestor *aFirst,
00070                                     nsIInterfaceRequestor *aSecond,
00071                                     nsIInterfaceRequestor **aResult)
00072 {
00073   *aResult = new nsInterfaceRequestorAgg(aFirst, aSecond);
00074   if (!aResult)
00075     return NS_ERROR_OUT_OF_MEMORY;
00076   NS_ADDREF(*aResult);
00077   return NS_OK;
00078 }