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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // SampleMap implements HistogramSamples interface. It is used by the
      6 // SparseHistogram class to store samples.
      7 
      8 #ifndef BASE_METRICS_SAMPLE_MAP_H_
      9 #define BASE_METRICS_SAMPLE_MAP_H_
     10 
     11 #include <map>
     12 
     13 #include "base/compiler_specific.h"
     14 #include "base/memory/scoped_ptr.h"
     15 #include "base/metrics/histogram_base.h"
     16 #include "base/metrics/histogram_samples.h"
     17 
     18 namespace base {
     19 
     20 class BASE_EXPORT_PRIVATE SampleMap : public HistogramSamples {
     21  public:
     22   SampleMap();
     23   virtual ~SampleMap();
     24 
     25   // HistogramSamples implementation:
     26   virtual void Accumulate(HistogramBase::Sample value,
     27                           HistogramBase::Count count) OVERRIDE;
     28   virtual HistogramBase::Count GetCount(
     29       HistogramBase::Sample value) const OVERRIDE;
     30   virtual HistogramBase::Count TotalCount() const OVERRIDE;
     31   virtual scoped_ptr<SampleCountIterator> Iterator() const OVERRIDE;
     32 
     33  protected:
     34   virtual bool AddSubtractImpl(
     35       SampleCountIterator* iter,
     36       HistogramSamples::Operator op) OVERRIDE;  // |op| is ADD or SUBTRACT.
     37 
     38  private:
     39   std::map<HistogramBase::Sample, HistogramBase::Count> sample_counts_;
     40 
     41   DISALLOW_COPY_AND_ASSIGN(SampleMap);
     42 };
     43 
     44 class BASE_EXPORT_PRIVATE SampleMapIterator : public SampleCountIterator {
     45  public:
     46   typedef std::map<HistogramBase::Sample, HistogramBase::Count>
     47       SampleToCountMap;
     48 
     49   explicit SampleMapIterator(const SampleToCountMap& sample_counts);
     50   virtual ~SampleMapIterator();
     51 
     52   // SampleCountIterator implementation:
     53   virtual bool Done() const OVERRIDE;
     54   virtual void Next() OVERRIDE;
     55   virtual void Get(HistogramBase::Sample* min,
     56                    HistogramBase::Sample* max,
     57                    HistogramBase::Count* count) const OVERRIDE;
     58  private:
     59   SampleToCountMap::const_iterator iter_;
     60   const SampleToCountMap::const_iterator end_;
     61 };
     62 
     63 }  // namespace base
     64 
     65 #endif  // BASE_METRICS_SAMPLE_MAP_H_
     66