mirror of
https://github.com/classilla/tenfourfox.git
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192 lines
5.2 KiB
C++
192 lines
5.2 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 nsRefPtrHashtable_h__
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#define nsRefPtrHashtable_h__
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#include "nsBaseHashtable.h"
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#include "nsHashKeys.h"
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#include "nsAutoPtr.h"
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/**
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* templated hashtable class maps keys to reference pointers.
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* See nsBaseHashtable for complete declaration.
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* @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
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* for a complete specification.
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* @param PtrType the reference-type being wrapped
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* @see nsDataHashtable, nsClassHashtable
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*/
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template<class KeyClass, class PtrType>
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class nsRefPtrHashtable
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: public nsBaseHashtable<KeyClass, RefPtr<PtrType>, PtrType*>
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{
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public:
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typedef typename KeyClass::KeyType KeyType;
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typedef PtrType* UserDataType;
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typedef nsBaseHashtable<KeyClass, RefPtr<PtrType>, PtrType*> base_type;
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nsRefPtrHashtable() {}
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explicit nsRefPtrHashtable(uint32_t aInitLength)
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: nsBaseHashtable<KeyClass, RefPtr<PtrType>, PtrType*>(aInitLength)
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{
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}
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/**
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* @copydoc nsBaseHashtable::Get
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* @param aData This is an XPCOM getter, so aData is already_addrefed.
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* If the key doesn't exist, aData will be set to nullptr.
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*/
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bool Get(KeyType aKey, UserDataType* aData) const;
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/**
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* Gets a weak reference to the hashtable entry.
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* @param aFound If not nullptr, will be set to true if the entry is found,
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* to false otherwise.
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* @return The entry, or nullptr if not found. Do not release this pointer!
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*/
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PtrType* GetWeak(KeyType aKey, bool* aFound = nullptr) const;
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// Overload Put, rather than overriding it.
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using base_type::Put;
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void Put(KeyType aKey, already_AddRefed<PtrType> aData);
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MOZ_WARN_UNUSED_RESULT bool Put(KeyType aKey, already_AddRefed<PtrType> aData,
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const mozilla::fallible_t&);
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// Overload Remove, rather than overriding it.
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using base_type::Remove;
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/**
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* Remove the data for the associated key, swapping the current value into
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* pData, thereby avoiding calls to AddRef and Release.
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* @param aKey the key to remove from the hashtable
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* @param aData This is an XPCOM getter, so aData is already_addrefed.
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* If the key doesn't exist, aData will be set to nullptr. Must be non-null.
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*/
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bool Remove(KeyType aKey, UserDataType* aData);
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};
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template<typename K, typename T>
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inline void
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ImplCycleCollectionUnlink(nsRefPtrHashtable<K, T>& aField)
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{
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aField.Clear();
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}
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template<typename K, typename T>
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inline void
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ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
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nsRefPtrHashtable<K, T>& aField,
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const char* aName,
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uint32_t aFlags = 0)
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{
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for (auto iter = aField.ConstIter(); !iter.Done(); iter.Next()) {
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CycleCollectionNoteChild(aCallback, iter.UserData(), aName, aFlags);
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}
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}
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//
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// nsRefPtrHashtable definitions
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//
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template<class KeyClass, class PtrType>
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bool
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nsRefPtrHashtable<KeyClass, PtrType>::Get(KeyType aKey,
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UserDataType* aRefPtr) const
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{
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typename base_type::EntryType* ent = this->GetEntry(aKey);
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if (ent) {
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if (aRefPtr) {
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*aRefPtr = ent->mData;
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NS_IF_ADDREF(*aRefPtr);
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}
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return true;
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}
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// if the key doesn't exist, set *aRefPtr to null
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// so that it is a valid XPCOM getter
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if (aRefPtr) {
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*aRefPtr = nullptr;
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}
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return false;
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}
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template<class KeyClass, class PtrType>
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PtrType*
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nsRefPtrHashtable<KeyClass, PtrType>::GetWeak(KeyType aKey, bool* aFound) const
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{
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typename base_type::EntryType* ent = this->GetEntry(aKey);
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if (ent) {
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if (aFound) {
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*aFound = true;
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}
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return ent->mData;
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}
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// Key does not exist, return nullptr and set aFound to false
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if (aFound) {
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*aFound = false;
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}
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return nullptr;
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}
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template<class KeyClass, class PtrType>
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void
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nsRefPtrHashtable<KeyClass, PtrType>::Put(KeyType aKey,
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already_AddRefed<PtrType> aData)
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{
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if (!Put(aKey, mozilla::Move(aData), mozilla::fallible)) {
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NS_ABORT_OOM(this->mTable.EntrySize() * this->mTable.EntryCount());
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}
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}
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template<class KeyClass, class PtrType>
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bool
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nsRefPtrHashtable<KeyClass, PtrType>::Put(KeyType aKey,
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already_AddRefed<PtrType> aData,
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const mozilla::fallible_t&)
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{
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typename base_type::EntryType* ent = this->PutEntry(aKey);
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if (!ent) {
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return false;
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}
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ent->mData = aData;
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return true;
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}
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template<class KeyClass, class PtrType>
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bool
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nsRefPtrHashtable<KeyClass, PtrType>::Remove(KeyType aKey,
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UserDataType* aRefPtr)
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{
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MOZ_ASSERT(aRefPtr);
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typename base_type::EntryType* ent = this->GetEntry(aKey);
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if (ent) {
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ent->mData.forget(aRefPtr);
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this->Remove(aKey);
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return true;
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}
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// If the key doesn't exist, set *aRefPtr to null
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// so that it is a valid XPCOM getter.
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*aRefPtr = nullptr;
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return false;
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}
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#endif // nsRefPtrHashtable_h__
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