зеркало из https://github.com/mozilla/gecko-dev.git
209 строки
6.2 KiB
C++
209 строки
6.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#define NS_WEAK_OBSERVERS
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#include "pratom.h"
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#include "nsString.h"
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#include "nsAutoLock.h"
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#include "nsCOMPtr.h"
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#include "nsIWeakReference.h"
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#include "nsEnumeratorUtils.h"
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#include "nsObserverList.h"
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nsObserverList::nsObserverList()
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{
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MOZ_COUNT_CTOR(nsObserverList);
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mLock = PR_NewLock();
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}
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nsObserverList::~nsObserverList(void)
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{
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MOZ_COUNT_DTOR(nsObserverList);
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PR_DestroyLock(mLock);
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}
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nsresult
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nsObserverList::AddObserver(nsIObserver* anObserver, PRBool ownsWeak)
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{
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nsresult rv;
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PRBool inserted;
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NS_ENSURE_ARG(anObserver);
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nsAutoLock lock(mLock);
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if (!mObserverList) {
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rv = NS_NewISupportsArray(getter_AddRefs(mObserverList));
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if (NS_FAILED(rv)) return rv;
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}
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#ifdef NS_WEAK_OBSERVERS
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nsCOMPtr<nsISupports> observerRef;
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if (ownsWeak) {
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nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
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NS_ASSERTION(weakRefFactory, "AddObserver: trying weak object that doesnt support nsIWeakReference");
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if ( weakRefFactory )
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observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory)));
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} else {
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#if DEBUG_dougt_xxx
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// if you are hitting this assertion, contact dougt@netscape.com. There may be a ownership problem caused by his checkin to freeze nsIObserver
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nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
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NS_ASSERTION(!weakRefFactory, "Your object supports weak references, but is being added with a strong reference");
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#endif
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observerRef = anObserver;
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}
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if (!observerRef)
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return NS_ERROR_FAILURE;
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inserted = mObserverList->AppendElement(observerRef);
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#else
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if (*anObserver)
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inserted = mObserverList->AppendElement(*anObserver);
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#endif
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return inserted ? NS_OK : NS_ERROR_FAILURE;
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}
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nsresult
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nsObserverList::RemoveObserver(nsIObserver* anObserver)
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{
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PRBool removed = PR_FALSE;
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NS_ENSURE_ARG(anObserver);
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nsAutoLock lock(mLock);
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if (!mObserverList)
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return NS_ERROR_FAILURE;
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#ifdef NS_WEAK_OBSERVERS
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nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
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nsCOMPtr<nsISupports> observerRef;
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if (weakRefFactory) {
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observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory)));
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if (observerRef)
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removed = mObserverList->RemoveElement(observerRef);
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if (!removed)
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observerRef = anObserver;
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} else
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observerRef = anObserver;
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if (!removed && observerRef)
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removed = mObserverList->RemoveElement(observerRef);
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#else
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if (*anObserver)
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removed = mObserverList->RemoveElement(*anObserver);
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#endif
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return removed ? NS_OK : NS_ERROR_FAILURE;
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}
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nsresult
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nsObserverList::GetObserverList(nsISimpleEnumerator** anEnumerator)
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{
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nsAutoLock lock(mLock);
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ObserverListEnumerator * enumerator= new ObserverListEnumerator(mObserverList);
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NS_IF_ADDREF(enumerator);
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*anEnumerator = enumerator;
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return NS_OK;
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}
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ObserverListEnumerator::ObserverListEnumerator(nsISupportsArray* aValueArray)
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: mValueArray(aValueArray), mIndex(0)
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{
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NS_IF_ADDREF(mValueArray);
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if (mValueArray) {
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PRUint32 total;
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mValueArray->Count(&total);
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mIndex = PRInt32(total);
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}
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}
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ObserverListEnumerator::~ObserverListEnumerator(void)
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{
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NS_IF_RELEASE(mValueArray);
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}
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NS_IMPL_ISUPPORTS1(ObserverListEnumerator, nsISimpleEnumerator)
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NS_IMETHODIMP
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ObserverListEnumerator::HasMoreElements(PRBool* aResult)
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{
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NS_PRECONDITION(aResult != 0, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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if (!mValueArray) {
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*aResult = PR_FALSE;
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return NS_OK;
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}
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*aResult = (mIndex > 0);
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return NS_OK;
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}
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NS_IMETHODIMP
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ObserverListEnumerator::GetNext(nsISupports** aResult)
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{
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NS_PRECONDITION(aResult != 0, "null ptr");
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if (! aResult)
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return NS_ERROR_NULL_POINTER;
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if (!mValueArray) {
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*aResult = nsnull;
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return NS_OK;
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}
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if (mIndex <= 0 )
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return NS_ERROR_UNEXPECTED;
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mValueArray->GetElementAt(--mIndex, aResult);
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if (*aResult) {
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nsCOMPtr<nsIWeakReference> weakRefFactory = do_QueryInterface(*aResult);
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if ( weakRefFactory ) {
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nsCOMPtr<nsISupports> weakref = do_QueryReferent(weakRefFactory);
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NS_RELEASE(*aResult);
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NS_IF_ADDREF(*aResult = weakref);
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return NS_OK;
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}
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}
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return NS_OK;
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}
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