зеркало из https://github.com/mozilla/pjs.git
186 строки
6.1 KiB
C++
186 строки
6.1 KiB
C++
/* vim:set st=2 sts=2 ts=2 et cin: */
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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 a cache for services in a category.
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*
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* The Initial Developer of the Original Code is
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* Christian Biesinger <cbiesinger@web.de>.
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* Portions created by the Initial Developer are Copyright (C) 2005
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 "nsIObserverService.h"
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#include "nsISupportsPrimitives.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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nsCategoryListener* aListener)
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: mListener(nsnull), mCategory(aCategory), mObserversRemoved(false)
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{
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if (!mHash.Init()) {
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// OOM
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return;
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}
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mListener = aListener;
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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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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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nsTArray<nsCString> entries;
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nsCOMPtr<nsISupports> entry;
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while (NS_SUCCEEDED(enumerator->GetNext(getter_AddRefs(entry)))) {
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nsCOMPtr<nsISupportsCString> entryName = do_QueryInterface(entry, &rv);
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if (NS_SUCCEEDED(rv)) {
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nsCAutoString categoryEntry;
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rv = entryName->GetData(categoryEntry);
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nsCString entryValue;
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catMan->GetCategoryEntry(aCategory,
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categoryEntry.get(),
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getter_Copies(entryValue));
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if (NS_SUCCEEDED(rv)) {
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mHash.Put(categoryEntry, entryValue);
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entries.AppendElement(entryValue);
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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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do_GetService(NS_OBSERVERSERVICE_CONTRACTID);
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if (serv) {
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serv->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, PR_FALSE);
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serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID, PR_FALSE);
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serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID, PR_FALSE);
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serv->AddObserver(this, NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID, PR_FALSE);
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}
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for (PRInt32 i = entries.Length() - 1; i >= 0; --i)
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mListener->EntryAdded(entries[i]);
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}
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nsCategoryObserver::~nsCategoryObserver() {
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}
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NS_IMPL_ISUPPORTS1(nsCategoryObserver, nsIObserver)
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void
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nsCategoryObserver::ListenerDied() {
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mListener = nsnull;
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RemoveObservers();
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}
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NS_HIDDEN_(void)
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nsCategoryObserver::RemoveObservers() {
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if (mObserversRemoved)
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return;
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mObserversRemoved = true;
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nsCOMPtr<nsIObserverService> obsSvc =
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do_GetService(NS_OBSERVERSERVICE_CONTRACTID);
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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 PRUnichar* aData) {
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if (!mListener)
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return NS_OK;
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if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
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mHash.Clear();
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mListener->CategoryCleared();
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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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nsCAutoString 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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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.Get(str, nsnull))
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return NS_OK;
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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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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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mHash.Put(str, entryValue);
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mListener->EntryAdded(entryValue);
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} else if (strcmp(aTopic, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID) == 0) {
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nsCAutoString val;
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if (mHash.Get(str, &val)) {
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mHash.Remove(str);
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mListener->EntryRemoved(val);
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}
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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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mListener->CategoryCleared();
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}
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return NS_OK;
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}
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