зеркало из https://github.com/mozilla/pjs.git
250 строки
7.0 KiB
C++
250 строки
7.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#define NS_IMPL_IDS
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#include "prlock.h"
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#include "nsIFactory.h"
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#include "nsIServiceManager.h"
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#include "nsRepository.h"
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#include "nsIObserverService.h"
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#include "nsObserverService.h"
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#include "nsIObserverList.h"
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#include "nsObserverList.h"
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#include "nsHashtable.h"
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#include "nsString.h"
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static NS_DEFINE_CID(kObserverServiceCID, NS_OBSERVERSERVICE_CID);
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////////////////////////////////////////////////////////////////////////////////
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static nsObserverService* gObserverService = nsnull; // The one-and-only ObserverService
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////////////////////////////////////////////////////////////////////////////////
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// nsObserverService Implementation
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NS_IMPL_ISUPPORTS1(nsObserverService, nsIObserverService)
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NS_COM nsresult NS_NewObserverService(nsIObserverService** anObserverService)
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{
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return nsObserverService::GetObserverService(anObserverService);
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}
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nsObserverService::nsObserverService()
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: mObserverTopicTable(NULL)
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{
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NS_INIT_REFCNT();
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mObserverTopicTable = nsnull;
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}
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nsObserverService::~nsObserverService(void)
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{
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if(mObserverTopicTable)
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delete mObserverTopicTable;
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gObserverService = nsnull;
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}
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NS_METHOD
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nsObserverService::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
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{
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nsresult rv;
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nsObserverService* os = new nsObserverService();
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if (os == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(os);
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rv = os->QueryInterface(aIID, aInstancePtr);
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NS_RELEASE(os);
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return rv;
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}
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nsresult nsObserverService::GetObserverService(nsIObserverService** anObserverService)
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{
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if (! gObserverService) {
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nsObserverService* it = new nsObserverService();
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if (! it)
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return NS_ERROR_OUT_OF_MEMORY;
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gObserverService = it;
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}
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NS_ADDREF(gObserverService);
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*anObserverService = gObserverService;
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return NS_OK;
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}
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static PRBool
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ReleaseObserverList(nsHashKey *aKey, void *aData, void* closure)
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{
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nsIObserverList* observerList = NS_STATIC_CAST(nsIObserverList*, aData);
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NS_RELEASE(observerList);
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return PR_TRUE;
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}
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nsresult nsObserverService::GetObserverList(const nsString& aTopic, nsIObserverList** anObserverList)
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{
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if (anObserverList == NULL)
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{
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return NS_ERROR_NULL_POINTER;
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}
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if(mObserverTopicTable == NULL) {
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mObserverTopicTable = new nsObjectHashtable(nsnull, nsnull, // should never be cloned
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ReleaseObserverList, nsnull,
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256, PR_TRUE);
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if (mObserverTopicTable == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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}
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nsStringKey key(aTopic);
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nsIObserverList *topicObservers = nsnull;
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if (mObserverTopicTable->Exists(&key)) {
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topicObservers = (nsIObserverList *) mObserverTopicTable->Get(&key);
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if (topicObservers != NULL) {
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*anObserverList = topicObservers;
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} else {
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NS_NewObserverList(&topicObservers);
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mObserverTopicTable->Put(&key, topicObservers);
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}
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} else {
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NS_NewObserverList(&topicObservers);
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*anObserverList = topicObservers;
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mObserverTopicTable->Put(&key, topicObservers);
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}
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return NS_OK;
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}
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nsresult nsObserverService::AddObserver(nsIObserver* anObserver, const PRUnichar* aTopic)
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{
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nsIObserverList* anObserverList;
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nsresult rv;
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if (anObserver == NULL)
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{
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return NS_ERROR_NULL_POINTER;
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}
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if (aTopic == NULL)
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{
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return NS_ERROR_NULL_POINTER;
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}
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nsAutoString topic(aTopic);
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rv = GetObserverList(topic, &anObserverList);
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if (NS_FAILED(rv)) return rv;
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if (anObserverList) {
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return anObserverList->AddObserver(&anObserver);
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}
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return NS_ERROR_FAILURE;
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}
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nsresult nsObserverService::RemoveObserver(nsIObserver* anObserver, const PRUnichar* aTopic)
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{
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nsIObserverList* anObserverList;
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nsresult rv;
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if (anObserver == NULL)
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{
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return NS_ERROR_NULL_POINTER;
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}
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if (aTopic == NULL)
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{
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return NS_ERROR_NULL_POINTER;
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}
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nsAutoString topic(aTopic);
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rv = GetObserverList(topic, &anObserverList);
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if (NS_FAILED(rv)) return rv;
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if (anObserverList) {
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return anObserverList->RemoveObserver(&anObserver);
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}
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return NS_ERROR_FAILURE;
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}
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nsresult nsObserverService::EnumerateObserverList(const PRUnichar* aTopic, nsIEnumerator** anEnumerator)
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{
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nsIObserverList* anObserverList;
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nsresult rv;
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if (anEnumerator == NULL)
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{
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return NS_ERROR_NULL_POINTER;
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}
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if (aTopic == NULL)
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{
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return NS_ERROR_NULL_POINTER;
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}
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nsAutoString topic(aTopic);
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rv = GetObserverList(topic, &anObserverList);
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if (NS_FAILED(rv)) return rv;
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if (anObserverList) {
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return anObserverList->EnumerateObserverList(anEnumerator);
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}
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return NS_ERROR_FAILURE;
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}
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// Enumerate observers of aTopic and call Observe on each.
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nsresult nsObserverService::Notify( nsISupports *aSubject,
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const PRUnichar *aTopic,
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const PRUnichar *someData ) {
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nsresult rv = NS_OK;
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nsIEnumerator *observers;
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// Get observer list enumerator.
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rv = this->EnumerateObserverList( aTopic, &observers );
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if ( NS_SUCCEEDED( rv ) ) {
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// Go to start of observer list.
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rv = observers->First();
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// Continue until error or end of list.
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while ( observers->IsDone() != NS_OK && NS_SUCCEEDED(rv) ) {
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// Get current item (observer).
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nsISupports *base;
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rv = observers->CurrentItem( &base );
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if ( NS_SUCCEEDED( rv ) ) {
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// Convert item to nsIObserver.
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nsIObserver *observer;
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rv = base->QueryInterface( nsIObserver::GetIID(), (void**)&observer );
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if ( NS_SUCCEEDED( rv ) && observer ) {
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// Tell the observer what's up.
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observer->Observe( aSubject, aTopic, someData );
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// Release the observer.
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observer->Release();
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}
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}
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// Go on to next observer in list.
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rv = observers->Next();
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}
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// Release the observer list.
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observers->Release();
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rv = NS_OK;
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}
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return rv;
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}
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////////////////////////////////////////////////////////////////////////////////
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