| /* |
| * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| namespace WTF { |
| |
| // This specialization is a direct copy of HashMap, with overloaded functions |
| // to allow for lookup by pointer instead of RefPtr, avoiding ref-count churn. |
| |
| // FIXME: Find a better way that doesn't require an entire copy of the HashMap template. |
| |
| template<typename RawKeyType, typename ValueType, typename ValueTraits, typename HashFunctions> |
| struct RefPtrHashMapRawKeyTranslator { |
| typedef typename ValueType::first_type KeyType; |
| typedef typename ValueType::second_type MappedType; |
| typedef typename ValueTraits::FirstTraits KeyTraits; |
| typedef typename ValueTraits::SecondTraits MappedTraits; |
| |
| static unsigned hash(RawKeyType key) { return HashFunctions::hash(key); } |
| static bool equal(const KeyType& a, RawKeyType b) { return HashFunctions::equal(a, b); } |
| static void translate(ValueType& location, RawKeyType key, const MappedType& mapped) |
| { |
| location.first = key; |
| location.second = mapped; |
| } |
| }; |
| |
| template<typename T, typename MappedArg, typename HashArg, typename KeyTraitsArg, typename MappedTraitsArg> |
| class HashMap<RefPtr<T>, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg> { |
| private: |
| typedef KeyTraitsArg KeyTraits; |
| typedef MappedTraitsArg MappedTraits; |
| typedef PairHashTraits<KeyTraits, MappedTraits> ValueTraits; |
| |
| public: |
| typedef typename KeyTraits::TraitType KeyType; |
| typedef T* RawKeyType; |
| typedef typename MappedTraits::TraitType MappedType; |
| typedef typename ValueTraits::TraitType ValueType; |
| |
| private: |
| typedef HashArg HashFunctions; |
| |
| typedef HashTable<KeyType, ValueType, PairFirstExtractor<ValueType>, |
| HashFunctions, ValueTraits, KeyTraits> HashTableType; |
| |
| typedef RefPtrHashMapRawKeyTranslator<RawKeyType, ValueType, ValueTraits, HashFunctions> |
| RawKeyTranslator; |
| |
| public: |
| typedef HashTableIteratorAdapter<HashTableType, ValueType> iterator; |
| typedef HashTableConstIteratorAdapter<HashTableType, ValueType> const_iterator; |
| |
| void swap(HashMap&); |
| |
| int size() const; |
| int capacity() const; |
| bool isEmpty() const; |
| |
| // iterators iterate over pairs of keys and values |
| iterator begin(); |
| iterator end(); |
| const_iterator begin() const; |
| const_iterator end() const; |
| |
| iterator find(const KeyType&); |
| iterator find(RawKeyType); |
| const_iterator find(const KeyType&) const; |
| const_iterator find(RawKeyType) const; |
| bool contains(const KeyType&) const; |
| bool contains(RawKeyType) const; |
| MappedType get(const KeyType&) const; |
| MappedType get(RawKeyType) const; |
| MappedType inlineGet(RawKeyType) const; |
| |
| // replaces value but not key if key is already present |
| // return value is a pair of the iterator to the key location, |
| // and a boolean that's true if a new value was actually added |
| pair<iterator, bool> set(const KeyType&, const MappedType&); |
| pair<iterator, bool> set(RawKeyType, const MappedType&); |
| |
| // does nothing if key is already present |
| // return value is a pair of the iterator to the key location, |
| // and a boolean that's true if a new value was actually added |
| pair<iterator, bool> add(const KeyType&, const MappedType&); |
| pair<iterator, bool> add(RawKeyType, const MappedType&); |
| |
| void remove(const KeyType&); |
| void remove(RawKeyType); |
| void remove(iterator); |
| void clear(); |
| |
| MappedType take(const KeyType&); // efficient combination of get with remove |
| MappedType take(RawKeyType); // efficient combination of get with remove |
| |
| private: |
| pair<iterator, bool> inlineAdd(const KeyType&, const MappedType&); |
| pair<iterator, bool> inlineAdd(RawKeyType, const MappedType&); |
| |
| HashTableType m_impl; |
| }; |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline void HashMap<RefPtr<T>, U, V, W, X>::swap(HashMap& other) |
| { |
| m_impl.swap(other.m_impl); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline int HashMap<RefPtr<T>, U, V, W, X>::size() const |
| { |
| return m_impl.size(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline int HashMap<RefPtr<T>, U, V, W, X>::capacity() const |
| { |
| return m_impl.capacity(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline bool HashMap<RefPtr<T>, U, V, W, X>::isEmpty() const |
| { |
| return m_impl.isEmpty(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::iterator HashMap<RefPtr<T>, U, V, W, X>::begin() |
| { |
| return m_impl.begin(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::iterator HashMap<RefPtr<T>, U, V, W, X>::end() |
| { |
| return m_impl.end(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::const_iterator HashMap<RefPtr<T>, U, V, W, X>::begin() const |
| { |
| return m_impl.begin(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::const_iterator HashMap<RefPtr<T>, U, V, W, X>::end() const |
| { |
| return m_impl.end(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::iterator HashMap<RefPtr<T>, U, V, W, X>::find(const KeyType& key) |
| { |
| return m_impl.find(key); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::iterator HashMap<RefPtr<T>, U, V, W, X>::find(RawKeyType key) |
| { |
| return m_impl.template find<RawKeyType, RawKeyTranslator>(key); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::const_iterator HashMap<RefPtr<T>, U, V, W, X>::find(const KeyType& key) const |
| { |
| return m_impl.find(key); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline typename HashMap<RefPtr<T>, U, V, W, X>::const_iterator HashMap<RefPtr<T>, U, V, W, X>::find(RawKeyType key) const |
| { |
| return m_impl.template find<RawKeyType, RawKeyTranslator>(key); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline bool HashMap<RefPtr<T>, U, V, W, X>::contains(const KeyType& key) const |
| { |
| return m_impl.contains(key); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline bool HashMap<RefPtr<T>, U, V, W, X>::contains(RawKeyType key) const |
| { |
| return m_impl.template contains<RawKeyType, RawKeyTranslator>(key); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline pair<typename HashMap<RefPtr<T>, U, V, W, X>::iterator, bool> |
| HashMap<RefPtr<T>, U, V, W, X>::inlineAdd(const KeyType& key, const MappedType& mapped) |
| { |
| typedef HashMapTranslator<ValueType, ValueTraits, HashFunctions> TranslatorType; |
| return m_impl.template add<KeyType, MappedType, TranslatorType>(key, mapped); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline pair<typename HashMap<RefPtr<T>, U, V, W, X>::iterator, bool> |
| HashMap<RefPtr<T>, U, V, W, X>::inlineAdd(RawKeyType key, const MappedType& mapped) |
| { |
| return m_impl.template add<RawKeyType, MappedType, RawKeyTranslator>(key, mapped); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| pair<typename HashMap<RefPtr<T>, U, V, W, X>::iterator, bool> |
| HashMap<RefPtr<T>, U, V, W, X>::set(const KeyType& key, const MappedType& mapped) |
| { |
| pair<iterator, bool> result = inlineAdd(key, mapped); |
| if (!result.second) { |
| // add call above didn't change anything, so set the mapped value |
| result.first->second = mapped; |
| } |
| return result; |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| pair<typename HashMap<RefPtr<T>, U, V, W, X>::iterator, bool> |
| HashMap<RefPtr<T>, U, V, W, X>::set(RawKeyType key, const MappedType& mapped) |
| { |
| pair<iterator, bool> result = inlineAdd(key, mapped); |
| if (!result.second) { |
| // add call above didn't change anything, so set the mapped value |
| result.first->second = mapped; |
| } |
| return result; |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| pair<typename HashMap<RefPtr<T>, U, V, W, X>::iterator, bool> |
| HashMap<RefPtr<T>, U, V, W, X>::add(const KeyType& key, const MappedType& mapped) |
| { |
| return inlineAdd(key, mapped); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| pair<typename HashMap<RefPtr<T>, U, V, W, X>::iterator, bool> |
| HashMap<RefPtr<T>, U, V, W, X>::add(RawKeyType key, const MappedType& mapped) |
| { |
| return inlineAdd(key, mapped); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename MappedTraits> |
| typename HashMap<RefPtr<T>, U, V, W, MappedTraits>::MappedType |
| HashMap<RefPtr<T>, U, V, W, MappedTraits>::get(const KeyType& key) const |
| { |
| ValueType* entry = const_cast<HashTableType&>(m_impl).lookup(key); |
| if (!entry) |
| return MappedTraits::emptyValue(); |
| return entry->second; |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename MappedTraits> |
| typename HashMap<RefPtr<T>, U, V, W, MappedTraits>::MappedType |
| inline HashMap<RefPtr<T>, U, V, W, MappedTraits>::inlineGet(RawKeyType key) const |
| { |
| ValueType* entry = const_cast<HashTableType&>(m_impl).template lookup<RawKeyType, RawKeyTranslator>(key); |
| if (!entry) |
| return MappedTraits::emptyValue(); |
| return entry->second; |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename MappedTraits> |
| typename HashMap<RefPtr<T>, U, V, W, MappedTraits>::MappedType |
| HashMap<RefPtr<T>, U, V, W, MappedTraits>::get(RawKeyType key) const |
| { |
| return inlineGet(key); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline void HashMap<RefPtr<T>, U, V, W, X>::remove(iterator it) |
| { |
| if (it.m_impl == m_impl.end()) |
| return; |
| m_impl.checkTableConsistency(); |
| m_impl.removeWithoutEntryConsistencyCheck(it.m_impl); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline void HashMap<RefPtr<T>, U, V, W, X>::remove(const KeyType& key) |
| { |
| remove(find(key)); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline void HashMap<RefPtr<T>, U, V, W, X>::remove(RawKeyType key) |
| { |
| remove(find(key)); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename X> |
| inline void HashMap<RefPtr<T>, U, V, W, X>::clear() |
| { |
| m_impl.clear(); |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename MappedTraits> |
| typename HashMap<RefPtr<T>, U, V, W, MappedTraits>::MappedType |
| HashMap<RefPtr<T>, U, V, W, MappedTraits>::take(const KeyType& key) |
| { |
| // This can probably be made more efficient to avoid ref/deref churn. |
| iterator it = find(key); |
| if (it == end()) |
| return MappedTraits::emptyValue(); |
| typename HashMap<RefPtr<T>, U, V, W, MappedTraits>::MappedType result = it->second; |
| remove(it); |
| return result; |
| } |
| |
| template<typename T, typename U, typename V, typename W, typename MappedTraits> |
| typename HashMap<RefPtr<T>, U, V, W, MappedTraits>::MappedType |
| HashMap<RefPtr<T>, U, V, W, MappedTraits>::take(RawKeyType key) |
| { |
| // This can probably be made more efficient to avoid ref/deref churn. |
| iterator it = find(key); |
| if (it == end()) |
| return MappedTraits::emptyValue(); |
| typename HashMap<RefPtr<T>, U, V, W, MappedTraits>::MappedType result = it->second; |
| remove(it); |
| return result; |
| } |
| |
| } // namespace WTF |
