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#pragma once
#include "search/cbv.hpp"
#include "indexer/mwm_set.hpp"
#include "geometry/rect2d.hpp"
#include "base/assert.hpp"
#include <algorithm>
#include <cstdint>
#include <deque>
#include <map>
#include <memory>
#include <utility>
namespace base
{
class Cancellable;
};
namespace search
{
class MwmContext;
// This class represents a simple cache of features in rects for all mwms.
//
// *NOTE* This class is not thread-safe.
class GeometryCache
{
public:
virtual ~GeometryCache() = default;
// Returns (hopefully, cached) list of features in a given
// rect. Note that return value may be invalidated on next calls to
// this method.
virtual CBV Get(MwmContext const & context, m2::RectD const & rect, int scale) = 0;
inline void Clear() { m_entries.clear(); }
protected:
struct Entry
{
m2::RectD m_rect;
CBV m_cbv;
int m_scale = 0;
};
// |maxNumEntries| denotes the maximum number of rectangles that
// will be cached for each mwm individually.
GeometryCache(size_t maxNumEntries, base::Cancellable const & cancellable);
template <typename TPred>
std::pair<Entry &, bool> FindOrCreateEntry(MwmSet::MwmId const & id, TPred && pred)
{
auto & entries = m_entries[id];
auto it = find_if(entries.begin(), entries.end(), std::forward<TPred>(pred));
if (it != entries.end())
{
if (it != entries.begin())
iter_swap(entries.begin(), it);
return std::pair<Entry &, bool>(entries.front(), false);
}
entries.emplace_front();
if (entries.size() == m_maxNumEntries + 1)
entries.pop_back();
ASSERT_LESS_OR_EQUAL(entries.size(), m_maxNumEntries, ());
ASSERT(!entries.empty(), ());
return std::pair<Entry &, bool>(entries.front(), true);
}
void InitEntry(MwmContext const & context, m2::RectD const & rect, int scale, Entry & entry);
std::map<MwmSet::MwmId, std::deque<Entry>> m_entries;
size_t const m_maxNumEntries;
base::Cancellable const & m_cancellable;
};
class PivotRectsCache : public GeometryCache
{
public:
PivotRectsCache(size_t maxNumEntries, base::Cancellable const & cancellable,
double maxRadiusMeters);
// GeometryCache overrides:
CBV Get(MwmContext const & context, m2::RectD const & rect, int scale) override;
private:
double const m_maxRadiusMeters;
};
class LocalityRectsCache : public GeometryCache
{
public:
LocalityRectsCache(size_t maxNumEntries, base::Cancellable const & cancellable);
// GeometryCache overrides:
CBV Get(MwmContext const & context, m2::RectD const & rect, int scale) override;
};
} // namespace search
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