The Tor Browser: xpcom/ds/nsObserverList.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "nsObserverList.h"

     8 #include "nsAutoPtr.h"

     9 #include "nsCOMArray.h"

    10 #include "nsISimpleEnumerator.h"

    11 #include "xpcpublic.h"

    13 nsresult

    14 nsObserverList::AddObserver(nsIObserver* anObserver, bool ownsWeak)

    15 {

    16     NS_ASSERTION(anObserver, "Null input");

    18     if (!ownsWeak) {

    19         ObserverRef* o = mObservers.AppendElement(anObserver);

    20         if (!o)

    21             return NS_ERROR_OUT_OF_MEMORY;

    23         return NS_OK;

    24     }

    26     nsCOMPtr<nsIWeakReference> weak = do_GetWeakReference(anObserver);

    27     if (!weak)

    28         return NS_NOINTERFACE;

    30     ObserverRef *o = mObservers.AppendElement(weak);

    31     if (!o)

    32         return NS_ERROR_OUT_OF_MEMORY;

    34     return NS_OK;

    35 }

    37 nsresult

    38 nsObserverList::RemoveObserver(nsIObserver* anObserver)

    39 {

    40     NS_ASSERTION(anObserver, "Null input");

    42     if (mObservers.RemoveElement(static_cast<nsISupports*>(anObserver)))

    43         return NS_OK;

    45     nsCOMPtr<nsIWeakReference> observerRef = do_GetWeakReference(anObserver);

    46     if (!observerRef)

    47         return NS_ERROR_FAILURE;

    49     if (!mObservers.RemoveElement(observerRef))

    50         return NS_ERROR_FAILURE;

    52     return NS_OK;

    53 }

    55 nsresult

    56 nsObserverList::GetObserverList(nsISimpleEnumerator** anEnumerator)

    57 {

    58     nsRefPtr<nsObserverEnumerator> e(new nsObserverEnumerator(this));

    59     e.forget(anEnumerator);

    60     return NS_OK;

    61 }

    63 void

    64 nsObserverList::FillObserverArray(nsCOMArray<nsIObserver> &aArray)

    65 {

    66     aArray.SetCapacity(mObservers.Length());

    68     nsTArray<ObserverRef> observers(mObservers);

    70     for (int32_t i = observers.Length() - 1; i >= 0; --i) {

    71         if (observers[i].isWeakRef) {

    72             nsCOMPtr<nsIObserver> o(do_QueryReferent(observers[i].asWeak()));

    73             if (o) {

    74                 aArray.AppendObject(o);

    75             }

    76             else {

    77                 // the object has gone away, remove the weakref

    78                 mObservers.RemoveElement(observers[i].asWeak());

    79             }

    80         }

    81         else {

    82             aArray.AppendObject(observers[i].asObserver());

    83         }

    84     }

    85 }

    87 void

    88 nsObserverList::NotifyObservers(nsISupports *aSubject,

    89                                 const char *aTopic,

    90                                 const char16_t *someData)

    91 {

    92     nsCOMArray<nsIObserver> observers;

    93     FillObserverArray(observers);

    95     for (int32_t i = 0; i < observers.Count(); ++i) {

    96         observers[i]->Observe(aSubject, aTopic, someData);

    97     }

    98 }

   100 void

   101 nsObserverList::UnmarkGrayStrongObservers()

   102 {

   103     for (uint32_t i = 0; i < mObservers.Length(); ++i) {

   104         if (!mObservers[i].isWeakRef) {

   105             xpc_TryUnmarkWrappedGrayObject(mObservers[i].asObserver());

   106         }

   107     }

   108 }

   110 NS_IMPL_ISUPPORTS(nsObserverEnumerator, nsISimpleEnumerator)

   112 nsObserverEnumerator::nsObserverEnumerator(nsObserverList* aObserverList)

   113     : mIndex(0)

   114 {

   115     aObserverList->FillObserverArray(mObservers);

   116 }

   118 NS_IMETHODIMP

   119 nsObserverEnumerator::HasMoreElements(bool *aResult)

   120 {

   121     *aResult = (mIndex < mObservers.Count());

   122     return NS_OK;

   123 }

   125 NS_IMETHODIMP

   126 nsObserverEnumerator::GetNext(nsISupports* *aResult)

   127 {

   128     if (mIndex == mObservers.Count()) {

   129         NS_ERROR("Enumerating after HasMoreElements returned false.");

   130         return NS_ERROR_UNEXPECTED;

   131     }

   133     NS_ADDREF(*aResult = mObservers[mIndex]);

   134     ++mIndex;

   135     return NS_OK;

   136 }

The Tor Browser / file revision