blob: 3e6fa4a633fad42deb4dc48332592341e84b3a01 [file] [log] [blame]
/*
* 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