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102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 NS_SVGATTRTEAROFFTABLE_H_
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#define NS_SVGATTRTEAROFFTABLE_H_
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#include "nsDataHashtable.h"
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#include "nsDebug.h"
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#include "nsHashKeys.h"
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/**
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* Global hashmap to associate internal SVG data types (e.g. nsSVGLength2) with
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* DOM tear-off objects (e.g. nsIDOMSVGLength). This allows us to always return
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* 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 nsSVGAttrTearoffTable
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{
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public:
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#ifdef DEBUG
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~nsSVGAttrTearoffTable()
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{
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MOZ_ASSERT(!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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typedef nsPtrHashKey<SimpleType> SimpleTypePtrKey;
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typedef nsDataHashtable<SimpleTypePtrKey, TearoffType* > TearoffTable;
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TearoffTable* mTable;
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};
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template<class SimpleType, class TearoffType>
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TearoffType*
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nsSVGAttrTearoffTable<SimpleType, TearoffType>::GetTearoff(SimpleType* aSimple)
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{
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if (!mTable)
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return nullptr;
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TearoffType *tearoff = nullptr;
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#ifdef DEBUG
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bool found =
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#endif
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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
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nsSVGAttrTearoffTable<SimpleType, TearoffType>::AddTearoff(SimpleType* aSimple,
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TearoffType* aTearoff)
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{
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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->Put(aSimple, aTearoff);
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}
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template<class SimpleType, class TearoffType>
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void
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nsSVGAttrTearoffTable<SimpleType, TearoffType>::RemoveTearoff(
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SimpleType* aSimple)
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{
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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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delete mTable;
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mTable = nullptr;
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}
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}
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#endif // NS_SVGATTRTEAROFFTABLE_H_
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