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xpcom/ds/nsObserverList.cpp@6474c204b198 (annotated)

xpcom/ds/nsObserverList.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

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

michael@0	1	/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0	2	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	#include "nsObserverList.h"
michael@0	7
michael@0	8	#include "nsAutoPtr.h"
michael@0	9	#include "nsCOMArray.h"
michael@0	10	#include "nsISimpleEnumerator.h"
michael@0	11	#include "xpcpublic.h"
michael@0	12
michael@0	13	nsresult
michael@0	14	nsObserverList::AddObserver(nsIObserver* anObserver, bool ownsWeak)
michael@0	15	{
michael@0	16	NS_ASSERTION(anObserver, "Null input");
michael@0	17
michael@0	18	if (!ownsWeak) {
michael@0	19	ObserverRef* o = mObservers.AppendElement(anObserver);
michael@0	20	if (!o)
michael@0	21	return NS_ERROR_OUT_OF_MEMORY;
michael@0	22
michael@0	23	return NS_OK;
michael@0	24	}
michael@0	25
michael@0	26	nsCOMPtr<nsIWeakReference> weak = do_GetWeakReference(anObserver);
michael@0	27	if (!weak)
michael@0	28	return NS_NOINTERFACE;
michael@0	29
michael@0	30	ObserverRef *o = mObservers.AppendElement(weak);
michael@0	31	if (!o)
michael@0	32	return NS_ERROR_OUT_OF_MEMORY;
michael@0	33
michael@0	34	return NS_OK;
michael@0	35	}
michael@0	36
michael@0	37	nsresult
michael@0	38	nsObserverList::RemoveObserver(nsIObserver* anObserver)
michael@0	39	{
michael@0	40	NS_ASSERTION(anObserver, "Null input");
michael@0	41
michael@0	42	if (mObservers.RemoveElement(static_cast<nsISupports*>(anObserver)))
michael@0	43	return NS_OK;
michael@0	44
michael@0	45	nsCOMPtr<nsIWeakReference> observerRef = do_GetWeakReference(anObserver);
michael@0	46	if (!observerRef)
michael@0	47	return NS_ERROR_FAILURE;
michael@0	48
michael@0	49	if (!mObservers.RemoveElement(observerRef))
michael@0	50	return NS_ERROR_FAILURE;
michael@0	51
michael@0	52	return NS_OK;
michael@0	53	}
michael@0	54
michael@0	55	nsresult
michael@0	56	nsObserverList::GetObserverList(nsISimpleEnumerator** anEnumerator)
michael@0	57	{
michael@0	58	nsRefPtr<nsObserverEnumerator> e(new nsObserverEnumerator(this));
michael@0	59	e.forget(anEnumerator);
michael@0	60	return NS_OK;
michael@0	61	}
michael@0	62
michael@0	63	void
michael@0	64	nsObserverList::FillObserverArray(nsCOMArray<nsIObserver> &aArray)
michael@0	65	{
michael@0	66	aArray.SetCapacity(mObservers.Length());
michael@0	67
michael@0	68	nsTArray<ObserverRef> observers(mObservers);
michael@0	69
michael@0	70	for (int32_t i = observers.Length() - 1; i >= 0; --i) {
michael@0	71	if (observers[i].isWeakRef) {
michael@0	72	nsCOMPtr<nsIObserver> o(do_QueryReferent(observers[i].asWeak()));
michael@0	73	if (o) {
michael@0	74	aArray.AppendObject(o);
michael@0	75	}
michael@0	76	else {
michael@0	77	// the object has gone away, remove the weakref
michael@0	78	mObservers.RemoveElement(observers[i].asWeak());
michael@0	79	}
michael@0	80	}
michael@0	81	else {
michael@0	82	aArray.AppendObject(observers[i].asObserver());
michael@0	83	}
michael@0	84	}
michael@0	85	}
michael@0	86
michael@0	87	void
michael@0	88	nsObserverList::NotifyObservers(nsISupports *aSubject,
michael@0	89	const char *aTopic,
michael@0	90	const char16_t *someData)
michael@0	91	{
michael@0	92	nsCOMArray<nsIObserver> observers;
michael@0	93	FillObserverArray(observers);
michael@0	94
michael@0	95	for (int32_t i = 0; i < observers.Count(); ++i) {
michael@0	96	observers[i]->Observe(aSubject, aTopic, someData);
michael@0	97	}
michael@0	98	}
michael@0	99
michael@0	100	void
michael@0	101	nsObserverList::UnmarkGrayStrongObservers()
michael@0	102	{
michael@0	103	for (uint32_t i = 0; i < mObservers.Length(); ++i) {
michael@0	104	if (!mObservers[i].isWeakRef) {
michael@0	105	xpc_TryUnmarkWrappedGrayObject(mObservers[i].asObserver());
michael@0	106	}
michael@0	107	}
michael@0	108	}
michael@0	109
michael@0	110	NS_IMPL_ISUPPORTS(nsObserverEnumerator, nsISimpleEnumerator)
michael@0	111
michael@0	112	nsObserverEnumerator::nsObserverEnumerator(nsObserverList* aObserverList)
michael@0	113	: mIndex(0)
michael@0	114	{
michael@0	115	aObserverList->FillObserverArray(mObservers);
michael@0	116	}
michael@0	117
michael@0	118	NS_IMETHODIMP
michael@0	119	nsObserverEnumerator::HasMoreElements(bool *aResult)
michael@0	120	{
michael@0	121	*aResult = (mIndex < mObservers.Count());
michael@0	122	return NS_OK;
michael@0	123	}
michael@0	124
michael@0	125	NS_IMETHODIMP
michael@0	126	nsObserverEnumerator::GetNext(nsISupports* *aResult)
michael@0	127	{
michael@0	128	if (mIndex == mObservers.Count()) {
michael@0	129	NS_ERROR("Enumerating after HasMoreElements returned false.");
michael@0	130	return NS_ERROR_UNEXPECTED;
michael@0	131	}
michael@0	132
michael@0	133	NS_ADDREF(*aResult = mObservers[mIndex]);
michael@0	134	++mIndex;
michael@0	135	return NS_OK;
michael@0	136	}