зеркало из https://github.com/mozilla/gecko-dev.git
308 строки
8.0 KiB
C++
308 строки
8.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 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 Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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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 mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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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 NPL, 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 NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#define NS_WEAK_OBSERVERS
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#define NS_IMPL_IDS
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#include "pratom.h"
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#include "nsIObserverList.h"
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#include "nsString.h"
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#include "nsAutoLock.h"
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#include "nsCOMPtr.h"
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#include "nsIWeakReference.h"
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#include "nsObserverList.h"
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#define NS_AUTOLOCK(__monitor) nsAutoLock __lock(__monitor)
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static NS_DEFINE_CID(kObserverListCID, NS_OBSERVERLIST_CID);
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class nsObserverListEnumerator : public nsIBidirectionalEnumerator
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{
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public:
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nsObserverListEnumerator( nsISupportsArray* );
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virtual ~nsObserverListEnumerator() {};
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NS_DECL_ISUPPORTS
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NS_DECL_NSIENUMERATOR
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NS_DECL_NSIBIDIRECTIONALENUMERATOR
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private:
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PRUint32 GetTargetArraySize() const;
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nsresult MoveToIndex( PRUint32 );
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private:
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nsCOMPtr<nsISupportsArray> mTargetArray;
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PRUint32 mCurrentItemIndex;
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};
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NS_IMPL_ISUPPORTS2(nsObserverListEnumerator,
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nsIBidirectionalEnumerator,
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nsIEnumerator)
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nsObserverListEnumerator::nsObserverListEnumerator( nsISupportsArray* anArray )
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: mRefCnt(0),
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mTargetArray(anArray),
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mCurrentItemIndex(0)
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{
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NS_INIT_REFCNT();
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}
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PRUint32
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nsObserverListEnumerator::GetTargetArraySize() const
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{
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PRUint32 array_size = 0;
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mTargetArray->Count(&array_size);
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return array_size;
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}
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nsresult
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nsObserverListEnumerator::MoveToIndex( PRUint32 aNewIndex )
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{
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mCurrentItemIndex = aNewIndex;
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return (aNewIndex < GetTargetArraySize()) ? NS_OK : NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsObserverListEnumerator::First()
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{
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NS_ASSERTION(mTargetArray, "must enumerate over an non-null list");
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return MoveToIndex(0);
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}
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NS_IMETHODIMP
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nsObserverListEnumerator::Last()
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{
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NS_ASSERTION(mTargetArray, "must enumerate over an non-null list");
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return MoveToIndex(GetTargetArraySize()-1);
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}
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NS_IMETHODIMP
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nsObserverListEnumerator::Prev()
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{
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NS_ASSERTION(mTargetArray, "must enumerate over an non-null list");
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return MoveToIndex(mCurrentItemIndex-1);
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}
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NS_IMETHODIMP
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nsObserverListEnumerator::Next()
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{
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NS_ASSERTION(mTargetArray, "must enumerate over an non-null list");
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return MoveToIndex(mCurrentItemIndex+1);
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}
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NS_IMETHODIMP
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nsObserverListEnumerator::CurrentItem( nsISupports** aItemPtr )
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{
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NS_ASSERTION(mTargetArray, "must enumerate over an non-null list");
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NS_ASSERTION(aItemPtr, "must supply a place to put the result");
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if ( mCurrentItemIndex >= GetTargetArraySize() )
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return NS_ERROR_FAILURE;
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nsCOMPtr<nsISupports> elementPtr = getter_AddRefs(mTargetArray->ElementAt(mCurrentItemIndex));
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if ( !aItemPtr || !elementPtr )
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return NS_ERROR_NULL_POINTER;
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nsCOMPtr<nsIWeakReference> weakRef = do_QueryInterface(elementPtr);
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nsresult status;
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if ( weakRef )
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status = weakRef->QueryReferent(NS_GET_IID(nsIObserver), NS_REINTERPRET_CAST(void**, aItemPtr));
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else
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status = elementPtr->QueryInterface(NS_GET_IID(nsIObserver), NS_REINTERPRET_CAST(void**, aItemPtr));
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return status;
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}
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NS_IMETHODIMP
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nsObserverListEnumerator::IsDone()
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{
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NS_ASSERTION(mTargetArray, "must enumerate over an non-null list");
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return (mCurrentItemIndex >= GetTargetArraySize()) ? NS_OK : NS_ENUMERATOR_FALSE;
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}
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////////////////////////////////////////////////////////////////////////////////
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// nsObserverList Implementation
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NS_IMPL_ISUPPORTS1(nsObserverList, nsIObserverList)
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NS_COM nsresult NS_NewObserverList(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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nsObserverList* it = new nsObserverList();
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if (it == 0) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return it->QueryInterface(NS_GET_IID(nsIObserverList), (void **) anObserverList);
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}
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nsObserverList::nsObserverList()
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: mLock(nsnull)
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{
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NS_INIT_REFCNT();
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mLock = PR_NewLock();
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}
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nsObserverList::~nsObserverList(void)
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{
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PR_DestroyLock(mLock);
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}
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NS_IMETHODIMP nsObserverList::AddObserver(nsIObserver* anObserver)
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{
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nsresult rv;
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PRBool inserted;
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NS_ENSURE_ARG(anObserver);
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NS_AUTOLOCK(mLock);
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if (!mObserverList) {
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rv = NS_NewISupportsArray(getter_AddRefs(mObserverList));
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if (NS_FAILED(rv)) return rv;
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}
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#ifdef NS_WEAK_OBSERVERS
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nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
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nsCOMPtr<nsISupports> observerRef;
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if ( weakRefFactory )
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observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory)));
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else
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observerRef = anObserver;
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if(observerRef) {
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inserted = mObserverList->AppendElement(observerRef);
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#else
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if(*anObserver) {
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inserted = mObserverList->AppendElement(*anObserver);
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#endif
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return inserted ? NS_OK : NS_ERROR_FAILURE;
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP nsObserverList::RemoveObserver(nsIObserver* anObserver)
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{
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PRBool removed;
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NS_ENSURE_ARG(anObserver);
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NS_AUTOLOCK(mLock);
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if (!mObserverList)
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return NS_ERROR_FAILURE;
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#ifdef NS_WEAK_OBSERVERS
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nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
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nsCOMPtr<nsISupports> observerRef;
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if ( weakRefFactory )
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observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory)));
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else
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observerRef = anObserver;
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if(observerRef) {
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removed = mObserverList->RemoveElement(observerRef);
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#else
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if(*anObserver) {
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removed = mObserverList->RemoveElement(*anObserver);
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#endif
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return removed ? NS_OK : NS_ERROR_FAILURE;
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP nsObserverList::EnumerateObserverList(nsIEnumerator** anEnumerator)
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{
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NS_AUTOLOCK(mLock);
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NS_ENSURE_ARG(anEnumerator);
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if (!mObserverList)
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return NS_ERROR_FAILURE;
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#ifdef NS_WEAK_OBSERVERS
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nsCOMPtr<nsIBidirectionalEnumerator> enumerator = new nsObserverListEnumerator(mObserverList);
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if ( !enumerator )
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return NS_ERROR_OUT_OF_MEMORY;
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return CallQueryInterface(enumerator, anEnumerator);
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#else
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return mObserverList->Enumerate(anEnumerator);
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#endif
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}
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//----------------------------------------------------------------------------------------
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NS_METHOD nsObserverList::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
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//----------------------------------------------------------------------------------------
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{
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if (aInstancePtr == NULL)
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return NS_ERROR_NULL_POINTER;
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nsObserverList* it = new nsObserverList;
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if (!it)
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return NS_ERROR_OUT_OF_MEMORY;
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nsresult rv = it->QueryInterface(aIID, aInstancePtr);
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if (NS_FAILED(rv))
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{
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delete it;
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return rv;
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}
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return rv;
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}
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