1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/accessible/src/base/nsAccCache.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,81 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef _nsAccCache_H_
1.10 +#define _nsAccCache_H_
1.11 +
1.12 +#include "nsIAccessible.h"
1.13 +#include "nsRefPtrHashtable.h"
1.14 +#include "nsCycleCollectionParticipant.h"
1.15 +
1.16 +////////////////////////////////////////////////////////////////////////////////
1.17 +// Accessible cache utils
1.18 +////////////////////////////////////////////////////////////////////////////////
1.19 +
1.20 +/**
1.21 + * Shutdown and removes the accessible from cache.
1.22 + */
1.23 +template <class T>
1.24 +static PLDHashOperator
1.25 +ClearCacheEntry(const void* aKey, nsRefPtr<T>& aAccessible, void* aUserArg)
1.26 +{
1.27 + NS_ASSERTION(aAccessible, "Calling ClearCacheEntry with a nullptr pointer!");
1.28 + if (aAccessible)
1.29 + aAccessible->Shutdown();
1.30 +
1.31 + return PL_DHASH_REMOVE;
1.32 +}
1.33 +
1.34 +/**
1.35 + * Clear the cache and shutdown the accessibles.
1.36 + */
1.37 +
1.38 +static void
1.39 +ClearCache(mozilla::a11y::AccessibleHashtable& aCache)
1.40 +{
1.41 + aCache.Enumerate(ClearCacheEntry<mozilla::a11y::Accessible>, nullptr);
1.42 +}
1.43 +
1.44 +/**
1.45 + * Traverse the accessible cache entry for cycle collector.
1.46 + */
1.47 +template <class T>
1.48 +static PLDHashOperator
1.49 +CycleCollectorTraverseCacheEntry(const void *aKey, T *aAccessible,
1.50 + void *aUserArg)
1.51 +{
1.52 + nsCycleCollectionTraversalCallback *cb =
1.53 + static_cast<nsCycleCollectionTraversalCallback*>(aUserArg);
1.54 +
1.55 + NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*cb, "accessible cache entry");
1.56 +
1.57 + nsISupports *supports = static_cast<nsIAccessible*>(aAccessible);
1.58 + cb->NoteXPCOMChild(supports);
1.59 + return PL_DHASH_NEXT;
1.60 +}
1.61 +
1.62 +/**
1.63 + * Unlink the accessible cache for the cycle collector.
1.64 + */
1.65 +inline void
1.66 +ImplCycleCollectionUnlink(mozilla::a11y::AccessibleHashtable& aCache)
1.67 +{
1.68 + ClearCache(aCache);
1.69 +}
1.70 +
1.71 +/**
1.72 + * Traverse the accessible cache for cycle collector.
1.73 + */
1.74 +inline void
1.75 +ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
1.76 + mozilla::a11y::AccessibleHashtable& aCache,
1.77 + const char* aName,
1.78 + uint32_t aFlags = 0)
1.79 +{
1.80 + aCache.EnumerateRead(CycleCollectorTraverseCacheEntry<mozilla::a11y::Accessible>,
1.81 + &aCallback);
1.82 +}
1.83 +
1.84 +#endif
