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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:49:04 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:49:04 +0000 |
commit | 16f504a9dca3fe3b70568f67b7d41241ae485288 (patch) | |
tree | c60f36ada0496ba928b7161059ba5ab1ab224f9d /src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp | |
parent | Initial commit. (diff) | |
download | virtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.tar.xz virtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.zip |
Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp')
-rw-r--r-- | src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp b/src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp new file mode 100644 index 00000000..51fb04b5 --- /dev/null +++ b/src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp @@ -0,0 +1,211 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * 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 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): + * + * Alternatively, the contents of this file may be used under the terms of + * either of the GNU General Public License Version 2 or later (the "GPL"), + * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#define NS_WEAK_OBSERVERS + +#include "pratom.h" +#include "nsString.h" +#include "nsAutoLock.h" +#include "nsCOMPtr.h" +#include "nsIWeakReference.h" +#include "nsEnumeratorUtils.h" +#include "nsObserverList.h" + +nsObserverList::nsObserverList() +{ + MOZ_COUNT_CTOR(nsObserverList); + mLock = PR_NewLock(); +} + +nsObserverList::~nsObserverList(void) +{ + MOZ_COUNT_DTOR(nsObserverList); + PR_DestroyLock(mLock); +} + +nsresult +nsObserverList::AddObserver(nsIObserver* anObserver, PRBool ownsWeak) +{ + nsresult rv; + PRBool inserted; + + NS_ENSURE_ARG(anObserver); + + nsAutoLock lock(mLock); + + if (!mObserverList) { + rv = NS_NewISupportsArray(getter_AddRefs(mObserverList)); + if (NS_FAILED(rv)) return rv; + } + +#ifdef NS_WEAK_OBSERVERS + nsCOMPtr<nsISupports> observerRef; + if (ownsWeak) { + nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver); + NS_ASSERTION(weakRefFactory, "AddObserver: trying weak object that doesnt support nsIWeakReference"); + if ( weakRefFactory ) + observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory))); + } else { +#if DEBUG_dougt_xxx + // if you are hitting this assertion, contact dougt@netscape.com. There may be a ownership problem caused by his checkin to freeze nsIObserver + nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver); + NS_ASSERTION(!weakRefFactory, "Your object supports weak references, but is being added with a strong reference"); +#endif + observerRef = anObserver; + } + if (!observerRef) + return NS_ERROR_FAILURE; + + inserted = mObserverList->AppendElement(observerRef); +#else + if (*anObserver) + inserted = mObserverList->AppendElement(*anObserver); +#endif + return inserted ? NS_OK : NS_ERROR_FAILURE; +} + +nsresult +nsObserverList::RemoveObserver(nsIObserver* anObserver) +{ + PRBool removed = PR_FALSE; + + NS_ENSURE_ARG(anObserver); + + nsAutoLock lock(mLock); + + if (!mObserverList) + return NS_ERROR_FAILURE; + +#ifdef NS_WEAK_OBSERVERS + nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver); + nsCOMPtr<nsISupports> observerRef; + if (weakRefFactory) { + observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory))); + if (observerRef) + removed = mObserverList->RemoveElement(observerRef); + if (!removed) + observerRef = anObserver; + } else + observerRef = anObserver; + + if (!removed && observerRef) + removed = mObserverList->RemoveElement(observerRef); +#else + if (*anObserver) + removed = mObserverList->RemoveElement(*anObserver); +#endif + return removed ? NS_OK : NS_ERROR_FAILURE; +} + +nsresult +nsObserverList::GetObserverList(nsISimpleEnumerator** anEnumerator) +{ + nsAutoLock lock(mLock); + + ObserverListEnumerator * enumerator= new ObserverListEnumerator(mObserverList); + *anEnumerator = enumerator; + if (!enumerator) + return NS_ERROR_OUT_OF_MEMORY; + + NS_ADDREF(enumerator); + return NS_OK; +} + + +ObserverListEnumerator::ObserverListEnumerator(nsISupportsArray* aValueArray) + : mValueArray(aValueArray), mIndex(0) +{ + if (mValueArray) { + NS_ADDREF(mValueArray); + PRUint32 total; + mValueArray->Count(&total); + mIndex = PRInt32(total); + } +} + +ObserverListEnumerator::~ObserverListEnumerator(void) +{ + NS_IF_RELEASE(mValueArray); +} + +NS_IMPL_ISUPPORTS1(ObserverListEnumerator, nsISimpleEnumerator) + +NS_IMETHODIMP +ObserverListEnumerator::HasMoreElements(PRBool* aResult) +{ + NS_PRECONDITION(aResult != 0, "null ptr"); + if (! aResult) + return NS_ERROR_NULL_POINTER; + + if (!mValueArray) { + *aResult = PR_FALSE; + return NS_OK; + } + + *aResult = (mIndex > 0); + return NS_OK; +} + +NS_IMETHODIMP +ObserverListEnumerator::GetNext(nsISupports** aResult) +{ + NS_PRECONDITION(aResult != 0, "null ptr"); + if (! aResult) + return NS_ERROR_NULL_POINTER; + + if (!mValueArray) { + *aResult = nsnull; + return NS_OK; + } + + if (mIndex <= 0 ) + return NS_ERROR_UNEXPECTED; + + mValueArray->GetElementAt(--mIndex, aResult); + if (*aResult) { + nsCOMPtr<nsIWeakReference> weakRefFactory = do_QueryInterface(*aResult); + if ( weakRefFactory ) { + nsCOMPtr<nsISupports> weakref = do_QueryReferent(weakRefFactory); + NS_RELEASE(*aResult); + NS_IF_ADDREF(*aResult = weakref); + + return NS_OK; + } + } + + return NS_OK; +} |