pjs/xpcom/base/nsWeakReference.cpp

114 строки
2.9 KiB
C++
Исходник Обычный вид История

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Mozilla browser.
*
* The Initial Developer of the Original Code is Netscape
* Communications, Inc. Portions created by Netscape are
* Copyright (C) 1999, Mozilla. All Rights Reserved.
*
* Contributor(s):
* Scott Collins <scc@netscape.com>
*/
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// nsWeakReference.cpp
#include "nsWeakReference.h"
#include "nsCOMPtr.h"
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NS_COM nsIWeakReference *
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NS_GetWeakReference( nsISupports* aInstance, nsresult* aResult )
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{
nsresult status;
if ( !aResult )
aResult = &status;
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nsCOMPtr<nsISupportsWeakReference> factoryP = do_QueryInterface(aInstance, aResult);
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nsIWeakReference* weakP = 0;
if ( factoryP )
status = factoryP->GetWeakReference(&weakP);
return weakP;
}
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NS_IMETHODIMP
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nsSupportsWeakReference::GetWeakReference( nsIWeakReference** aInstancePtr )
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{
if ( !aInstancePtr )
return NS_ERROR_NULL_POINTER;
if ( !mProxy )
mProxy = new nsWeakReference(this);
*aInstancePtr = mProxy;
nsresult status;
if ( !*aInstancePtr )
status = NS_NOINTERFACE;
else
{
NS_ADDREF(*aInstancePtr);
status = NS_OK;
}
return status;
}
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NS_IMETHODIMP_(nsrefcnt)
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nsWeakReference::AddRef()
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{
return ++mRefCount;
}
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NS_IMETHODIMP_(nsrefcnt)
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nsWeakReference::Release()
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{
nsrefcnt temp = --mRefCount;
if ( !mRefCount )
delete this;
return temp;
}
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NS_IMETHODIMP
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nsWeakReference::QueryInterface( const nsIID& aIID, void** aInstancePtr )
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{
NS_ASSERTION(aInstancePtr, "QueryInterface requires a non-NULL destination!");
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if ( !aInstancePtr )
return NS_ERROR_NULL_POINTER;
nsISupports* foundInterface;
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if ( aIID.Equals(nsCOMTypeInfo<nsIWeakReference>::GetIID()) )
foundInterface = NS_STATIC_CAST(nsIWeakReference*, this);
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else if ( aIID.Equals(nsCOMTypeInfo<nsISupports>::GetIID()) )
foundInterface = NS_STATIC_CAST(nsISupports*, this);
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else
foundInterface = 0;
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nsresult status;
if ( !foundInterface )
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status = NS_NOINTERFACE;
else
{
NS_ADDREF(foundInterface);
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status = NS_OK;
}
*aInstancePtr = foundInterface;
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return status;
}
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NS_IMETHODIMP
nsWeakReference::QueryReferent( const nsIID& aIID, void** aInstancePtr )
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{
return mReferent ? mReferent->QueryInterface(aIID, aInstancePtr) : NS_ERROR_NULL_POINTER;
}