forked from mirrors/gecko-dev
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsObserverList.h"
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#include "mozilla/ResultExtensions.h"
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#include "nsCOMArray.h"
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#include "xpcpublic.h"
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nsresult nsObserverList::AddObserver(nsIObserver* anObserver, bool ownsWeak) {
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NS_ASSERTION(anObserver, "Null input");
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MOZ_TRY(mObservers.AppendWeakElement(anObserver, ownsWeak));
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return NS_OK;
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}
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nsresult nsObserverList::RemoveObserver(nsIObserver* anObserver) {
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NS_ASSERTION(anObserver, "Null input");
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MOZ_TRY(mObservers.RemoveWeakElement(anObserver));
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return NS_OK;
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}
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void nsObserverList::GetObserverList(nsISimpleEnumerator** anEnumerator) {
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RefPtr<nsObserverEnumerator> e(new nsObserverEnumerator(this));
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e.forget(anEnumerator);
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}
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nsCOMArray<nsIObserver> nsObserverList::ReverseCloneObserverArray() {
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nsCOMArray<nsIObserver> array;
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array.SetCapacity(mObservers.Length());
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// XXX This could also use RemoveElementsBy if we lifted the promise to fill
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// aArray in reverse order. Although there shouldn't be anyone explicitly
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// relying on the order, changing this might cause subtle problems, so we
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// better leave it as it is.
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for (int32_t i = mObservers.Length() - 1; i >= 0; --i) {
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nsCOMPtr<nsIObserver> observer = mObservers[i].GetValue();
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if (observer) {
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array.AppendElement(observer.forget());
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} else {
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// the object has gone away, remove the weakref
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mObservers.RemoveElementAt(i);
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}
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}
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return array;
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}
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void nsObserverList::AppendStrongObservers(nsCOMArray<nsIObserver>& aArray) {
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aArray.SetCapacity(aArray.Length() + mObservers.Length());
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for (int32_t i = mObservers.Length() - 1; i >= 0; --i) {
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if (!mObservers[i].IsWeak()) {
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nsCOMPtr<nsIObserver> observer = mObservers[i].GetValue();
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aArray.AppendObject(observer);
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}
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}
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}
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void nsObserverList::NotifyObservers(nsISupports* aSubject, const char* aTopic,
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const char16_t* someData) {
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const nsCOMArray<nsIObserver> observers = ReverseCloneObserverArray();
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for (int32_t i = 0; i < observers.Count(); ++i) {
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observers[i]->Observe(aSubject, aTopic, someData);
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}
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}
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nsObserverEnumerator::nsObserverEnumerator(nsObserverList* aObserverList)
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: mIndex(0), mObservers(aObserverList->ReverseCloneObserverArray()) {}
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NS_IMETHODIMP
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nsObserverEnumerator::HasMoreElements(bool* aResult) {
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*aResult = (mIndex < mObservers.Count());
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return NS_OK;
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}
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NS_IMETHODIMP
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nsObserverEnumerator::GetNext(nsISupports** aResult) {
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if (mIndex == mObservers.Count()) {
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return NS_ERROR_FAILURE;
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}
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NS_ADDREF(*aResult = mObservers[mIndex]);
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++mIndex;
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return NS_OK;
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}
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