pjs/xpcom/ds/nsObserverList.cpp

134 строки
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#define NS_IMPL_IDS
#include "pratom.h"
#include "nsIObserverList.h"
#include "nsObserverList.h"
#include "nsString.h"
#include "nsAutoLock.h"
#define NS_AUTOLOCK(__monitor) nsAutoLock __lock(__monitor)
static NS_DEFINE_IID(kIObserverListIID, NS_IOBSERVERLIST_IID);
static NS_DEFINE_IID(kObserverListCID, NS_OBSERVERLIST_CID);
////////////////////////////////////////////////////////////////////////////////
// nsObserverList Implementation
NS_IMPL_ISUPPORTS(nsObserverList, kIObserverListIID);
NS_COM nsresult NS_NewObserverList(nsIObserverList** anObserverList)
{
if (anObserverList == NULL)
{
return NS_ERROR_NULL_POINTER;
}
nsObserverList* it = new nsObserverList();
if (it == 0) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kIObserverListIID, (void **) anObserverList);
}
nsObserverList::nsObserverList()
: mObserverList(NULL),
mLock(nsnull)
{
NS_INIT_REFCNT();
mLock = PR_NewLock();
}
nsObserverList::~nsObserverList(void)
{
PR_DestroyLock(mLock);
}
nsresult nsObserverList::AddObserver(nsIObserver** anObserver)
{
nsresult rv;
PRBool inserted;
NS_AUTOLOCK(mLock);
if (anObserver == NULL)
{
return NS_ERROR_NULL_POINTER;
}
if(!mObserverList) {
rv = NS_NewISupportsArray(&mObserverList);
if (NS_FAILED(rv)) return rv;
}
if(*anObserver) {
inserted = mObserverList->AppendElement(*anObserver);
return inserted ? NS_OK : NS_ERROR_FAILURE;
}
return NS_ERROR_FAILURE;
}
nsresult nsObserverList::RemoveObserver(nsIObserver** anObserver)
{
PRBool removed;
NS_AUTOLOCK(mLock);
if (anObserver == NULL)
{
return NS_ERROR_NULL_POINTER;
}
if(!mObserverList) {
return NS_ERROR_FAILURE;
}
if(*anObserver) {
removed = mObserverList->RemoveElement(*anObserver);
return removed ? NS_OK : NS_ERROR_FAILURE;
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP nsObserverList::EnumerateObserverList(nsIEnumerator** anEnumerator)
{
NS_AUTOLOCK(mLock);
if (anEnumerator == NULL)
{
return NS_ERROR_NULL_POINTER;
}
if(!mObserverList) {
return NS_ERROR_FAILURE;
}
return mObserverList->Enumerate(anEnumerator);
}