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nsAccCache.h
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nsAccCache.h
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Alexander Surkov <surkov.alexander@gmail.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef _nsAccCache_H_
#define _nsAccCache_H_
#include "nsIAccessible.h"
#include "nsRefPtrHashtable.h"
#include "nsCycleCollectionParticipant.h"
////////////////////////////////////////////////////////////////////////////////
// Accessible cache utils
////////////////////////////////////////////////////////////////////////////////
/**
* Shutdown and removes the accessible from cache.
*/
template <class T>
static PLDHashOperator
ClearCacheEntry(const void* aKey, nsRefPtr<T>& aAccessible, void* aUserArg)
{
NS_ASSERTION(aAccessible, "Calling ClearCacheEntry with a NULL pointer!");
if (aAccessible)
aAccessible->Shutdown();
return PL_DHASH_REMOVE;
}
/**
* Clear the cache and shutdown the accessibles.
*/
template <class T>
static void
ClearCache(nsRefPtrHashtable<nsVoidPtrHashKey, T> & aCache)
{
aCache.Enumerate(ClearCacheEntry<T>, nsnull);
}
/**
* Traverse the accessible cache entry for cycle collector.
*/
template <class T>
static PLDHashOperator
CycleCollectorTraverseCacheEntry(const void *aKey, T *aAccessible,
void *aUserArg)
{
nsCycleCollectionTraversalCallback *cb =
static_cast<nsCycleCollectionTraversalCallback*>(aUserArg);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*cb, "accessible cache entry");
nsISupports *supports = static_cast<nsIAccessible*>(aAccessible);
cb->NoteXPCOMChild(supports);
return PL_DHASH_NEXT;
}
/**
* Traverse the accessible cache for cycle collector.
*/
template <class T>
static void
CycleCollectorTraverseCache(nsRefPtrHashtable<nsVoidPtrHashKey, T> & aCache,
nsCycleCollectionTraversalCallback *aCallback)
{
aCache.EnumerateRead(CycleCollectorTraverseCacheEntry<T>, aCallback);
}
#endif