149 lines
4.2 KiB
C++
149 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "nsIObserverService.h"
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#include "mozilla/Services.h"
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#include "nsISupportsPrimitives.h"
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#include "nsIStringEnumerator.h"
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#include "nsXPCOMCID.h"
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#include "nsCategoryCache.h"
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nsCategoryObserver::nsCategoryObserver(const char* aCategory)
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: mCategory(aCategory)
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, mObserversRemoved(false)
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{
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// First, enumerate the currently existing entries
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nsCOMPtr<nsICategoryManager> catMan =
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do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
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if (!catMan) {
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return;
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}
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nsCOMPtr<nsISimpleEnumerator> enumerator;
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nsresult rv = catMan->EnumerateCategory(aCategory,
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getter_AddRefs(enumerator));
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if (NS_FAILED(rv)) {
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return;
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}
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nsCOMPtr<nsIUTF8StringEnumerator> strings = do_QueryInterface(enumerator);
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MOZ_ASSERT(strings);
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bool more;
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while (NS_SUCCEEDED(strings->HasMore(&more)) && more) {
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nsAutoCString entryName;
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strings->GetNext(entryName);
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nsCString entryValue;
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rv = catMan->GetCategoryEntry(aCategory,
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entryName.get(),
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getter_Copies(entryValue));
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if (NS_SUCCEEDED(rv)) {
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nsCOMPtr<nsISupports> service = do_GetService(entryValue.get());
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if (service) {
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mHash.Put(entryName, service);
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}
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}
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}
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// Now, listen for changes
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nsCOMPtr<nsIObserverService> serv =
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mozilla::services::GetObserverService();
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if (serv) {
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serv->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
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serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID, false);
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serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID, false);
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serv->AddObserver(this, NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID, false);
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}
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}
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nsCategoryObserver::~nsCategoryObserver()
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{
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}
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NS_IMPL_ISUPPORTS(nsCategoryObserver, nsIObserver)
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void
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nsCategoryObserver::ListenerDied()
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{
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RemoveObservers();
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}
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void
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nsCategoryObserver::RemoveObservers()
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{
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if (mObserversRemoved) {
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return;
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}
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mObserversRemoved = true;
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nsCOMPtr<nsIObserverService> obsSvc =
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mozilla::services::GetObserverService();
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if (obsSvc) {
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obsSvc->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
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obsSvc->RemoveObserver(this, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID);
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obsSvc->RemoveObserver(this, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID);
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obsSvc->RemoveObserver(this, NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID);
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}
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}
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NS_IMETHODIMP
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nsCategoryObserver::Observe(nsISupports* aSubject, const char* aTopic,
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const char16_t* aData)
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{
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if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
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mHash.Clear();
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RemoveObservers();
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return NS_OK;
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}
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if (!aData ||
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!nsDependentString(aData).Equals(NS_ConvertASCIItoUTF16(mCategory))) {
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return NS_OK;
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}
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nsAutoCString str;
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nsCOMPtr<nsISupportsCString> strWrapper(do_QueryInterface(aSubject));
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if (strWrapper) {
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strWrapper->GetData(str);
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}
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if (strcmp(aTopic, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID) == 0) {
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// We may get an add notification even when we already have an entry. This
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// is due to the notification happening asynchronously, so if the entry gets
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// added and an nsCategoryObserver gets instantiated before events get
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// processed, we'd get the notification for an existing entry.
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// Do nothing in that case.
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if (mHash.GetWeak(str)) {
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return NS_OK;
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}
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nsCOMPtr<nsICategoryManager> catMan =
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do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
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if (!catMan) {
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return NS_OK;
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}
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nsCString entryValue;
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catMan->GetCategoryEntry(mCategory.get(),
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str.get(),
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getter_Copies(entryValue));
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nsCOMPtr<nsISupports> service = do_GetService(entryValue.get());
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if (service) {
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mHash.Put(str, service);
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}
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} else if (strcmp(aTopic, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID) == 0) {
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mHash.Remove(str);
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} else if (strcmp(aTopic, NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID) == 0) {
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mHash.Clear();
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}
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return NS_OK;
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}
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