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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.
#include "base/metrics/sample_map.h"
#include "base/logging.h"
using std::map;
namespace base {
typedef HistogramBase::Count Count;
typedef HistogramBase::Sample Sample;
SampleMap::SampleMap() {}
SampleMap::~SampleMap() {}
void SampleMap::Accumulate(Sample value, Count count) {
sample_counts_[value] += count;
IncreaseSum(count * value);
IncreaseRedundantCount(count);
}
Count SampleMap::GetCount(Sample value) const {
map<Sample, Count>::const_iterator it = sample_counts_.find(value);
if (it == sample_counts_.end())
return 0;
return it->second;
}
Count SampleMap::TotalCount() const {
Count count = 0;
for (map<Sample, Count>::const_iterator it = sample_counts_.begin();
it != sample_counts_.end();
++it) {
count += it->second;
}
return count;
}
scoped_ptr<SampleCountIterator> SampleMap::Iterator() const {
return scoped_ptr<SampleCountIterator>(new SampleMapIterator(sample_counts_));
}
bool SampleMap::AddSubtractImpl(SampleCountIterator* iter,
HistogramSamples::Operator op) {
Sample min;
Sample max;
Count count;
for (; !iter->Done(); iter->Next()) {
iter->Get(&min, &max, &count);
if (min + 1 != max)
return false; // SparseHistogram only supports bucket with size 1.
sample_counts_[min] += (op == HistogramSamples::ADD) ? count : -count;
}
return true;
}
SampleMapIterator::SampleMapIterator(const SampleToCountMap& sample_counts)
: iter_(sample_counts.begin()),
end_(sample_counts.end()) {}
SampleMapIterator::~SampleMapIterator() {}
bool SampleMapIterator::Done() const {
return iter_ == end_;
}
void SampleMapIterator::Next() {
DCHECK(!Done());
iter_++;
}
void SampleMapIterator::Get(Sample* min, Sample* max, Count* count) const {
DCHECK(!Done());
if (min != NULL)
*min = iter_->first;
if (max != NULL)
*max = iter_->first + 1;
if (count != NULL)
*count = iter_->second;
}
} // namespace base
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