зеркало из https://github.com/mozilla/gecko-dev.git
139 строки
3.6 KiB
C++
139 строки
3.6 KiB
C++
/* -*- 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>
|
|
* Pierre Phaneuf <pp@ludusdesign.com>
|
|
*/
|
|
|
|
// nsWeakReference.cpp
|
|
|
|
#include "nsWeakReference.h"
|
|
#include "nsCOMPtr.h"
|
|
|
|
nsresult
|
|
nsQueryReferent::operator()( const nsIID& aIID, void** answer ) const
|
|
{
|
|
nsresult status;
|
|
if ( mWeakPtr )
|
|
{
|
|
if ( !NS_SUCCEEDED(status = mWeakPtr->QueryReferent(aIID, answer)) )
|
|
*answer = 0;
|
|
}
|
|
else
|
|
status = NS_ERROR_NULL_POINTER;
|
|
|
|
if ( mErrorPtr )
|
|
*mErrorPtr = status;
|
|
return status;
|
|
}
|
|
|
|
NS_COM nsIWeakReference*
|
|
NS_GetWeakReference( nsISupports* aInstancePtr, nsresult* aErrorPtr )
|
|
{
|
|
nsresult status;
|
|
nsIWeakReference* result = 0;
|
|
|
|
if ( aInstancePtr )
|
|
{
|
|
nsCOMPtr<nsISupportsWeakReference> factoryPtr = do_QueryInterface(aInstancePtr, &status);
|
|
NS_ASSERTION(factoryPtr, "Did you know you were calling |NS_GetWeakReference()| on something that doesn't support weak references?");
|
|
if ( factoryPtr )
|
|
status = factoryPtr->GetWeakReference(&result);
|
|
// else, |status| has already been set by |do_QueryInterface|
|
|
}
|
|
else
|
|
status = NS_ERROR_NULL_POINTER;
|
|
|
|
if ( aErrorPtr )
|
|
*aErrorPtr = status;
|
|
return result;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsSupportsWeakReference::GetWeakReference( nsIWeakReference** aInstancePtr )
|
|
{
|
|
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;
|
|
}
|
|
|
|
NS_IMETHODIMP_(nsrefcnt)
|
|
nsWeakReference::AddRef()
|
|
{
|
|
return ++mRefCount;
|
|
}
|
|
|
|
NS_IMETHODIMP_(nsrefcnt)
|
|
nsWeakReference::Release()
|
|
{
|
|
nsrefcnt temp = --mRefCount;
|
|
if ( !mRefCount )
|
|
delete this;
|
|
return temp;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsWeakReference::QueryInterface( const nsIID& aIID, void** aInstancePtr )
|
|
{
|
|
NS_ASSERTION(aInstancePtr, "QueryInterface requires a non-NULL destination!");
|
|
|
|
if ( !aInstancePtr )
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
nsISupports* foundInterface;
|
|
if ( aIID.Equals(NS_GET_IID(nsIWeakReference)) )
|
|
foundInterface = NS_STATIC_CAST(nsIWeakReference*, this);
|
|
else if ( aIID.Equals(NS_GET_IID(nsISupports)) )
|
|
foundInterface = NS_STATIC_CAST(nsISupports*, this);
|
|
else
|
|
foundInterface = 0;
|
|
|
|
nsresult status;
|
|
if ( !foundInterface )
|
|
status = NS_NOINTERFACE;
|
|
else
|
|
{
|
|
NS_ADDREF(foundInterface);
|
|
status = NS_OK;
|
|
}
|
|
|
|
*aInstancePtr = foundInterface;
|
|
return status;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsWeakReference::QueryReferent( const nsIID& aIID, void** aInstancePtr )
|
|
{
|
|
return mReferent ? mReferent->QueryInterface(aIID, aInstancePtr) : NS_ERROR_NULL_POINTER;
|
|
}
|