142 lines
3.8 KiB
C++
142 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; 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 nsInterfaceHashtable_h__
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#define nsInterfaceHashtable_h__
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#include "nsBaseHashtable.h"
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#include "nsHashKeys.h"
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#include "nsCOMPtr.h"
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/**
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* templated hashtable class maps keys to interface 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 Interface the interface-type being wrapped
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* @see nsDataHashtable, nsClassHashtable
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*/
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template<class KeyClass, class Interface>
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class nsInterfaceHashtable
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: public nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*>
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{
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public:
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typedef typename KeyClass::KeyType KeyType;
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typedef Interface* UserDataType;
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typedef nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*> base_type;
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nsInterfaceHashtable() {}
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explicit nsInterfaceHashtable(uint32_t aInitLength)
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: nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*>(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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* @copydoc nsBaseHashtable::Get
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*/
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already_AddRefed<Interface> Get(KeyType aKey) 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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Interface* GetWeak(KeyType aKey, bool* aFound = nullptr) const;
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};
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template<typename K, typename T>
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inline void
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ImplCycleCollectionUnlink(nsInterfaceHashtable<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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const nsInterfaceHashtable<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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// nsInterfaceHashtable definitions
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//
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template<class KeyClass, class Interface>
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bool
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nsInterfaceHashtable<KeyClass, Interface>::Get(KeyType aKey,
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UserDataType* aInterface) 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 (aInterface) {
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*aInterface = ent->mData;
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NS_IF_ADDREF(*aInterface);
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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 *aInterface to null
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// so that it is a valid XPCOM getter
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if (aInterface) {
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*aInterface = nullptr;
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}
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return false;
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}
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template<class KeyClass, class Interface>
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already_AddRefed<Interface>
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nsInterfaceHashtable<KeyClass, Interface>::Get(KeyType aKey) 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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return nullptr;
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}
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nsCOMPtr<Interface> copy = ent->mData;
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return copy.forget();
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}
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template<class KeyClass, class Interface>
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Interface*
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nsInterfaceHashtable<KeyClass, Interface>::GetWeak(KeyType aKey,
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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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#endif // nsInterfaceHashtable_h__
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