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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// SampleMap implements HistogramSamples interface. It is used by the
// SparseHistogram class to store samples.
#ifndef BASE_METRICS_SAMPLE_MAP_H_
#define BASE_METRICS_SAMPLE_MAP_H_
#include <map>
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
namespace base {
class BASE_EXPORT_PRIVATE SampleMap : public HistogramSamples {
public:
SampleMap();
~SampleMap() override;
// HistogramSamples implementation:
void Accumulate(HistogramBase::Sample value,
HistogramBase::Count count) override;
HistogramBase::Count GetCount(HistogramBase::Sample value) const override;
HistogramBase::Count TotalCount() const override;
scoped_ptr<SampleCountIterator> Iterator() const override;
protected:
bool AddSubtractImpl(
SampleCountIterator* iter,
HistogramSamples::Operator op) override; // |op| is ADD or SUBTRACT.
private:
std::map<HistogramBase::Sample, HistogramBase::Count> sample_counts_;
DISALLOW_COPY_AND_ASSIGN(SampleMap);
};
class BASE_EXPORT_PRIVATE SampleMapIterator : public SampleCountIterator {
public:
typedef std::map<HistogramBase::Sample, HistogramBase::Count>
SampleToCountMap;
explicit SampleMapIterator(const SampleToCountMap& sample_counts);
~SampleMapIterator() override;
// SampleCountIterator implementation:
bool Done() const override;
void Next() override;
void Get(HistogramBase::Sample* min,
HistogramBase::Sample* max,
HistogramBase::Count* count) const override;
private:
void SkipEmptyBuckets();
SampleToCountMap::const_iterator iter_;
const SampleToCountMap::const_iterator end_;
};
} // namespace base
#endif // BASE_METRICS_SAMPLE_MAP_H_
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