| /* |
| * Copyright (C) 2011 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef Spectrum_h |
| #define Spectrum_h |
| |
| #include <wtf/HashMap.h> |
| #include <wtf/Vector.h> |
| #include <algorithm> |
| |
| namespace WTF { |
| |
| template<typename T> |
| class Spectrum { |
| public: |
| typedef typename HashMap<T, unsigned long>::iterator iterator; |
| typedef typename HashMap<T, unsigned long>::const_iterator const_iterator; |
| |
| Spectrum() { } |
| |
| void add(const T& key, unsigned long count = 1) |
| { |
| typename HashMap<T, unsigned long>::AddResult result = m_map.add(key, count); |
| if (!result.isNewEntry) |
| result.iterator->value += count; |
| } |
| |
| unsigned long get(const T& key) const |
| { |
| const_iterator iter = m_map.find(key); |
| if (iter == m_map.end()) |
| return 0; |
| return iter->value; |
| } |
| |
| iterator begin() { return m_map.begin(); } |
| iterator end() { return m_map.end(); } |
| const_iterator begin() const { return m_map.begin(); } |
| const_iterator end() const { return m_map.end(); } |
| |
| struct KeyAndCount { |
| KeyAndCount() { } |
| |
| KeyAndCount(const T& key, unsigned long count) |
| : key(key) |
| , count(count) |
| { |
| } |
| |
| bool operator<(const KeyAndCount& other) const |
| { |
| if (count != other.count) |
| return count < other.count; |
| // This causes lower-ordered keys being returned first; this is really just |
| // here to make sure that the order is somewhat deterministic rather than being |
| // determined by hashing. |
| return key > other.key; |
| } |
| |
| T key; |
| unsigned long count; |
| }; |
| |
| // Returns a list ordered from lowest-count to highest-count. |
| Vector<KeyAndCount> buildList() const |
| { |
| Vector<KeyAndCount> list; |
| for (const_iterator iter = begin(); iter != end(); ++iter) |
| list.append(KeyAndCount(iter->key, iter->value)); |
| |
| std::sort(list.begin(), list.end()); |
| return list; |
| } |
| |
| private: |
| HashMap<T, unsigned long> m_map; |
| }; |
| |
| } // namespace WTF |
| |
| using WTF::Spectrum; |
| |
| #endif // Spectrum_h |