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99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DOM_SVG_SVGATTRTEAROFFTABLE_H_
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#define DOM_SVG_SVGATTRTEAROFFTABLE_H_
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#include "mozilla/DebugOnly.h"
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#include "mozilla/StaticPtr.h"
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#include "nsTHashMap.h"
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#include "nsDebug.h"
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#include "nsHashKeys.h"
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namespace mozilla {
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/**
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* Global hashmap to associate internal SVG data types (e.g. SVGAnimatedLength)
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* with DOM tear-off objects (e.g. DOMSVGLength). This allows us to always
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* return the same object for subsequent requests for DOM objects.
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*
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* We don't keep an owning reference to the tear-off objects so they are
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* responsible for removing themselves from this table when they die.
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*/
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template <class SimpleType, class TearoffType>
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class SVGAttrTearoffTable {
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public:
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#ifdef DEBUG
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~SVGAttrTearoffTable() {
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NS_ASSERTION(!mTable, "Tear-off objects remain in hashtable at shutdown.");
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}
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#endif
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TearoffType* GetTearoff(SimpleType* aSimple);
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void AddTearoff(SimpleType* aSimple, TearoffType* aTearoff);
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void RemoveTearoff(SimpleType* aSimple);
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private:
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using SimpleTypePtrKey = nsPtrHashKey<SimpleType>;
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using TearoffTable = nsTHashMap<SimpleTypePtrKey, TearoffType*>;
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StaticAutoPtr<TearoffTable> mTable;
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};
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template <class SimpleType, class TearoffType>
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TearoffType* SVGAttrTearoffTable<SimpleType, TearoffType>::GetTearoff(
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SimpleType* aSimple) {
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if (!mTable) {
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return nullptr;
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}
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TearoffType* tearoff = nullptr;
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DebugOnly<bool> found = mTable->Get(aSimple, &tearoff);
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MOZ_ASSERT(!found || tearoff,
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"null pointer stored in attribute tear-off map");
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return tearoff;
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}
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template <class SimpleType, class TearoffType>
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void SVGAttrTearoffTable<SimpleType, TearoffType>::AddTearoff(
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SimpleType* aSimple, TearoffType* aTearoff) {
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if (!mTable) {
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mTable = new TearoffTable();
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}
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// We shouldn't be adding a tear-off if there already is one. If that happens,
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// something is wrong.
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if (mTable->Get(aSimple, nullptr)) {
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MOZ_ASSERT(false, "There is already a tear-off for this object.");
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return;
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}
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mTable->InsertOrUpdate(aSimple, aTearoff);
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}
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template <class SimpleType, class TearoffType>
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void SVGAttrTearoffTable<SimpleType, TearoffType>::RemoveTearoff(
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SimpleType* aSimple) {
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if (!mTable) {
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// Perhaps something happened in between creating the SimpleType object and
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// registering it
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return;
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}
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mTable->Remove(aSimple);
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if (mTable->Count() == 0) {
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mTable = nullptr;
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}
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}
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} // namespace mozilla
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#endif // DOM_SVG_SVGATTRTEAROFFTABLE_H_
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