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