зеркало из https://github.com/mozilla/pjs.git
161 строка
4.7 KiB
C++
161 строка
4.7 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: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsObserverList.h"
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#include "nsAutoPtr.h"
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#include "nsCOMArray.h"
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#include "nsISimpleEnumerator.h"
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nsresult
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nsObserverList::AddObserver(nsIObserver* anObserver, bool ownsWeak)
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{
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NS_ASSERTION(anObserver, "Null input");
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if (!ownsWeak) {
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ObserverRef* o = mObservers.AppendElement(anObserver);
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if (!o)
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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nsCOMPtr<nsIWeakReference> weak = do_GetWeakReference(anObserver);
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if (!weak)
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return NS_NOINTERFACE;
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ObserverRef *o = mObservers.AppendElement(weak);
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if (!o)
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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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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NS_ASSERTION(anObserver, "Null input");
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if (mObservers.RemoveElement(static_cast<nsISupports*>(anObserver)))
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return NS_OK;
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nsCOMPtr<nsIWeakReference> observerRef = do_GetWeakReference(anObserver);
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if (!observerRef)
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return NS_ERROR_FAILURE;
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if (!mObservers.RemoveElement(observerRef))
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return NS_ERROR_FAILURE;
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return NS_OK;
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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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nsRefPtr<nsObserverEnumerator> e(new nsObserverEnumerator(this));
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if (!e)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*anEnumerator = e);
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return NS_OK;
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}
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void
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nsObserverList::FillObserverArray(nsCOMArray<nsIObserver> &aArray)
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{
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aArray.SetCapacity(mObservers.Length());
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nsTArray<ObserverRef> observers(mObservers);
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for (PRInt32 i = observers.Length() - 1; i >= 0; --i) {
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if (observers[i].isWeakRef) {
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nsCOMPtr<nsIObserver> o(do_QueryReferent(observers[i].asWeak()));
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if (o) {
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aArray.AppendObject(o);
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}
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else {
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// the object has gone away, remove the weakref
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mObservers.RemoveElement(observers[i].asWeak());
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}
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}
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else {
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aArray.AppendObject(observers[i].asObserver());
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}
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}
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}
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void
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nsObserverList::NotifyObservers(nsISupports *aSubject,
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const char *aTopic,
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const PRUnichar *someData)
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{
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nsCOMArray<nsIObserver> observers;
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FillObserverArray(observers);
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for (PRInt32 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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NS_IMPL_ISUPPORTS1(nsObserverEnumerator, nsISimpleEnumerator)
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nsObserverEnumerator::nsObserverEnumerator(nsObserverList* aObserverList)
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: mIndex(0)
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{
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aObserverList->FillObserverArray(mObservers);
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}
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NS_IMETHODIMP
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nsObserverEnumerator::HasMoreElements(bool *aResult)
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{
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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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{
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if (mIndex == mObservers.Count()) {
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NS_ERROR("Enumerating after HasMoreElements returned false.");
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return NS_ERROR_UNEXPECTED;
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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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