xpcom/glue/nsInterfaceHashtable.h@129ffea94266 (annotated)
xpcom/glue/nsInterfaceHashtable.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef nsInterfaceHashtable_h__ |
| michael@0 | 7 | #define nsInterfaceHashtable_h__ |
| michael@0 | 8 | |
| michael@0 | 9 | #include "nsBaseHashtable.h" |
| michael@0 | 10 | #include "nsHashKeys.h" |
| michael@0 | 11 | #include "nsCOMPtr.h" |
| michael@0 | 12 | |
| michael@0 | 13 | /** |
| michael@0 | 14 | * templated hashtable class maps keys to interface pointers. |
| michael@0 | 15 | * See nsBaseHashtable for complete declaration. |
| michael@0 | 16 | * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h |
| michael@0 | 17 | * for a complete specification. |
| michael@0 | 18 | * @param Interface the interface-type being wrapped |
| michael@0 | 19 | * @see nsDataHashtable, nsClassHashtable |
| michael@0 | 20 | */ |
| michael@0 | 21 | template<class KeyClass,class Interface> |
| michael@0 | 22 | class nsInterfaceHashtable : |
| michael@0 | 23 | public nsBaseHashtable< KeyClass, nsCOMPtr<Interface> , Interface* > |
| michael@0 | 24 | { |
| michael@0 | 25 | public: |
| michael@0 | 26 | typedef typename KeyClass::KeyType KeyType; |
| michael@0 | 27 | typedef Interface* UserDataType; |
| michael@0 | 28 | typedef nsBaseHashtable< KeyClass, nsCOMPtr<Interface> , Interface* > |
| michael@0 | 29 | base_type; |
| michael@0 | 30 | |
| michael@0 | 31 | nsInterfaceHashtable() |
| michael@0 | 32 | { |
| michael@0 | 33 | } |
| michael@0 | 34 | explicit nsInterfaceHashtable(uint32_t aInitSize) |
| michael@0 | 35 | : nsBaseHashtable<KeyClass,nsCOMPtr<Interface>,Interface*>(aInitSize) |
| michael@0 | 36 | { |
| michael@0 | 37 | } |
| michael@0 | 38 | |
| michael@0 | 39 | /** |
| michael@0 | 40 | * @copydoc nsBaseHashtable::Get |
| michael@0 | 41 | * @param pData This is an XPCOM getter, so pData is already_addrefed. |
| michael@0 | 42 | * If the key doesn't exist, pData will be set to nullptr. |
| michael@0 | 43 | */ |
| michael@0 | 44 | bool Get(KeyType aKey, UserDataType* pData) const; |
| michael@0 | 45 | |
| michael@0 | 46 | /** |
| michael@0 | 47 | * @copydoc nsBaseHashtable::Get |
| michael@0 | 48 | */ |
| michael@0 | 49 | already_AddRefed<Interface> Get(KeyType aKey) const; |
| michael@0 | 50 | |
| michael@0 | 51 | /** |
| michael@0 | 52 | * Gets a weak reference to the hashtable entry. |
| michael@0 | 53 | * @param aFound If not nullptr, will be set to true if the entry is found, |
| michael@0 | 54 | * to false otherwise. |
| michael@0 | 55 | * @return The entry, or nullptr if not found. Do not release this pointer! |
| michael@0 | 56 | */ |
| michael@0 | 57 | Interface* GetWeak(KeyType aKey, bool* aFound = nullptr) const; |
| michael@0 | 58 | }; |
| michael@0 | 59 | |
| michael@0 | 60 | template <typename K, typename T> |
| michael@0 | 61 | inline void |
| michael@0 | 62 | ImplCycleCollectionUnlink(nsInterfaceHashtable<K, T>& aField) |
| michael@0 | 63 | { |
| michael@0 | 64 | aField.Clear(); |
| michael@0 | 65 | } |
| michael@0 | 66 | |
| michael@0 | 67 | template <typename K, typename T> |
| michael@0 | 68 | inline void |
| michael@0 | 69 | ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback, |
| michael@0 | 70 | const nsInterfaceHashtable<K, T>& aField, |
| michael@0 | 71 | const char* aName, |
| michael@0 | 72 | uint32_t aFlags = 0) |
| michael@0 | 73 | { |
| michael@0 | 74 | nsBaseHashtableCCTraversalData userData(aCallback, aName, aFlags); |
| michael@0 | 75 | |
| michael@0 | 76 | aField.EnumerateRead(ImplCycleCollectionTraverse_EnumFunc<typename K::KeyType,T*>, |
| michael@0 | 77 | &userData); |
| michael@0 | 78 | } |
| michael@0 | 79 | |
| michael@0 | 80 | // |
| michael@0 | 81 | // nsInterfaceHashtable definitions |
| michael@0 | 82 | // |
| michael@0 | 83 | |
| michael@0 | 84 | template<class KeyClass,class Interface> |
| michael@0 | 85 | bool |
| michael@0 | 86 | nsInterfaceHashtable<KeyClass,Interface>::Get |
| michael@0 | 87 | (KeyType aKey, UserDataType* pInterface) const |
| michael@0 | 88 | { |
| michael@0 | 89 | typename base_type::EntryType* ent = this->GetEntry(aKey); |
| michael@0 | 90 | |
| michael@0 | 91 | if (ent) |
| michael@0 | 92 | { |
| michael@0 | 93 | if (pInterface) |
| michael@0 | 94 | { |
| michael@0 | 95 | *pInterface = ent->mData; |
| michael@0 | 96 | |
| michael@0 | 97 | NS_IF_ADDREF(*pInterface); |
| michael@0 | 98 | } |
| michael@0 | 99 | |
| michael@0 | 100 | return true; |
| michael@0 | 101 | } |
| michael@0 | 102 | |
| michael@0 | 103 | // if the key doesn't exist, set *pInterface to null |
| michael@0 | 104 | // so that it is a valid XPCOM getter |
| michael@0 | 105 | if (pInterface) |
| michael@0 | 106 | *pInterface = nullptr; |
| michael@0 | 107 | |
| michael@0 | 108 | return false; |
| michael@0 | 109 | } |
| michael@0 | 110 | |
| michael@0 | 111 | template<class KeyClass, class Interface> |
| michael@0 | 112 | already_AddRefed<Interface> |
| michael@0 | 113 | nsInterfaceHashtable<KeyClass,Interface>::Get(KeyType aKey) const |
| michael@0 | 114 | { |
| michael@0 | 115 | typename base_type::EntryType* ent = this->GetEntry(aKey); |
| michael@0 | 116 | if (!ent) |
| michael@0 | 117 | return nullptr; |
| michael@0 | 118 | |
| michael@0 | 119 | nsCOMPtr<Interface> copy = ent->mData; |
| michael@0 | 120 | return copy.forget(); |
| michael@0 | 121 | } |
| michael@0 | 122 | |
| michael@0 | 123 | template<class KeyClass,class Interface> |
| michael@0 | 124 | Interface* |
| michael@0 | 125 | nsInterfaceHashtable<KeyClass,Interface>::GetWeak |
| michael@0 | 126 | (KeyType aKey, bool* aFound) const |
| michael@0 | 127 | { |
| michael@0 | 128 | typename base_type::EntryType* ent = this->GetEntry(aKey); |
| michael@0 | 129 | |
| michael@0 | 130 | if (ent) |
| michael@0 | 131 | { |
| michael@0 | 132 | if (aFound) |
| michael@0 | 133 | *aFound = true; |
| michael@0 | 134 | |
| michael@0 | 135 | return ent->mData; |
| michael@0 | 136 | } |
| michael@0 | 137 | |
| michael@0 | 138 | // Key does not exist, return nullptr and set aFound to false |
| michael@0 | 139 | if (aFound) |
| michael@0 | 140 | *aFound = false; |
| michael@0 | 141 | return nullptr; |
| michael@0 | 142 | } |
| michael@0 | 143 | |
| michael@0 | 144 | #endif // nsInterfaceHashtable_h__ |
