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164 lines
4.0 KiB
C++
164 lines
4.0 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 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 RefPtr the reference-type being wrapped
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* @see nsDataHashtable, nsClassHashtable
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*/
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template<class KeyClass, class RefPtr>
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class nsRefPtrHashtable :
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public nsBaseHashtable< KeyClass, nsRefPtr<RefPtr> , RefPtr* >
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{
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public:
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typedef typename KeyClass::KeyType KeyType;
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typedef RefPtr* UserDataType;
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typedef nsBaseHashtable< KeyClass, nsRefPtr<RefPtr> , RefPtr* > base_type;
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/**
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* @copydoc nsBaseHashtable::Get
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* @param pData This is an XPCOM getter, so pData is already_addrefed.
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* If the key doesn't exist, pData will be set to nullptr.
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*/
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bool Get(KeyType aKey, UserDataType* pData) 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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RefPtr* GetWeak(KeyType aKey, bool* aFound = nullptr) const;
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};
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/**
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* Thread-safe version of nsRefPtrHashtable
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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 RefPtr the reference-type being wrapped
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*/
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template<class KeyClass, class RefPtr>
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class nsRefPtrHashtableMT :
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public nsBaseHashtableMT< KeyClass, nsRefPtr<RefPtr> , RefPtr* >
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{
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public:
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typedef typename KeyClass::KeyType KeyType;
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typedef RefPtr* UserDataType;
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typedef nsBaseHashtableMT< KeyClass, nsRefPtr<RefPtr> , RefPtr* > base_type;
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/**
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* @copydoc nsBaseHashtable::Get
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* @param pData This is an XPCOM getter, so pData is already_addrefed.
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* If the key doesn't exist, pData will be set to nullptr.
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*/
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bool Get(KeyType aKey, UserDataType* pData) const;
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// GetWeak does not make sense on a multi-threaded hashtable, where another
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// thread may remove the entry (and hence release it) as soon as GetWeak
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// returns
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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 RefPtr>
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bool
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nsRefPtrHashtable<KeyClass,RefPtr>::Get
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(KeyType aKey, UserDataType* pRefPtr) 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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{
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if (pRefPtr)
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{
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*pRefPtr = ent->mData;
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NS_IF_ADDREF(*pRefPtr);
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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 *pRefPtr to null
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// so that it is a valid XPCOM getter
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if (pRefPtr)
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*pRefPtr = nullptr;
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return false;
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}
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template<class KeyClass, class RefPtr>
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RefPtr*
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nsRefPtrHashtable<KeyClass,RefPtr>::GetWeak
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(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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{
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if (aFound)
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*aFound = true;
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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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return nullptr;
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}
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//
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// nsRefPtrHashtableMT definitions
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//
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template<class KeyClass, class RefPtr>
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bool
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nsRefPtrHashtableMT<KeyClass,RefPtr>::Get
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(KeyType aKey, UserDataType* pRefPtr) const
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{
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PR_Lock(this->mLock);
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typename base_type::EntryType* ent = this->GetEntry(aKey);
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if (ent)
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{
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if (pRefPtr)
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{
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*pRefPtr = ent->mData;
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NS_IF_ADDREF(*pRefPtr);
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}
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PR_Unlock(this->mLock);
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return true;
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}
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// if the key doesn't exist, set *pRefPtr to null
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// so that it is a valid XPCOM getter
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if (pRefPtr)
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*pRefPtr = nullptr;
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PR_Unlock(this->mLock);
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return false;
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}
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#endif // nsRefPtrHashtable_h__
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