gecko-dev/xpcom/ds/nsObserver.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
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 *
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Pierre Phaneuf <pp@ludusdesign.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or 
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#include "pratom.h"
#include "nsIFactory.h"
#include "nsIServiceManager.h"
#include "nsIComponentManager.h"
#include "nsIObserver.h"
#include "nsObserver.h"

static NS_DEFINE_CID(kObserverCID, NS_OBSERVER_CID);

////////////////////////////////////////////////////////////////////////////////
// nsObserver Implementation


NS_IMPL_AGGREGATED(nsObserver)

NS_COM nsresult NS_NewObserver(nsIObserver** anObserver, nsISupports* outer)
{
    return nsObserver::Create(outer, NS_GET_IID(nsIObserver), (void**)anObserver);
}

NS_METHOD
nsObserver::Create(nsISupports* outer, const nsIID& aIID, void* *anObserver)
{
    NS_ENSURE_ARG_POINTER(anObserver);
	 NS_ENSURE_PROPER_AGGREGATION(outer, aIID);

    nsObserver* it = new nsObserver(outer);
    if (it == NULL)
        return NS_ERROR_OUT_OF_MEMORY;

    nsresult rv = it->AggregatedQueryInterface(aIID, anObserver);
    if (NS_FAILED(rv)) {
        delete it;
        return rv;
    }
    return rv;
}

nsObserver::nsObserver(nsISupports* outer)
{
    NS_INIT_AGGREGATED(outer);
}

nsObserver::~nsObserver(void)
{
}

NS_IMETHODIMP
nsObserver::AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr)
{
    NS_ENSURE_ARG_POINTER(aInstancePtr);

    if (aIID.Equals(NS_GET_IID(nsISupports)))
	     *aInstancePtr = GetInner();
	 else if(aIID.Equals(NS_GET_IID(nsIObserver)))
	     *aInstancePtr = NS_STATIC_CAST(nsIObserver*, this);
	 else {
	     *aInstancePtr = nsnull;
		  return NS_NOINTERFACE;
	 }

	 NS_ADDREF((nsISupports*)*aInstancePtr);
	 return NS_OK;
}

NS_IMETHODIMP
nsObserver::Observe( nsISupports *, const char *, const PRUnichar * ) {
    nsresult rv = NS_OK;
    return rv;
}

////////////////////////////////////////////////////////////////////////////////