Repo created

libs/platform/mwm_traits.hpp

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+#pragma once
+
+#include "platform/mwm_version.hpp"
+
+#include <string>
+
+namespace version
+{
+// This is a wrapper around mwm's version.  Allows users to get
+// information about versions of some data structures in mwm.
+class MwmTraits
+{
+public:
+  enum class SearchIndexFormat
+  {
+    // A list of features with their ranks and centers
+    // is stored behind every node of the search trie.
+    // This format corresponds to ValueList<FeatureWithRankAndCenter>.
+    FeaturesWithRankAndCenter,
+
+    // A compressed bit vector of feature indices is
+    // stored behind every node of the search trie.
+    // This format corresponds to ValueList<Uint64IndexValue>.
+    CompressedBitVector,
+
+    // A compressed bit vector of feature indices is
+    // stored behind every node of the search trie.
+    // This format corresponds to ValueList<Uint64IndexValue>.
+    // Section has header.
+    CompressedBitVectorWithHeader,
+  };
+
+  enum class HouseToStreetTableFormat
+  {
+    // Versioning is independent of MwmTraits: section format depends on the section header.
+    HouseToStreetTableWithHeader,
+
+    // The format of relation is unknown. Most likely, an error has occured.
+    Unknown
+  };
+
+  enum class CentersTableFormat
+  {
+    // Centers table encoded without any header. Coding params from mwm header are used.
+    PlainEliasFanoMap,
+
+    // Centers table has its own header with version and coding params.
+    EliasFanoMapWithHeader,
+  };
+
+  explicit MwmTraits(MwmVersion const & version);
+
+  SearchIndexFormat GetSearchIndexFormat() const;
+
+  HouseToStreetTableFormat GetHouseToStreetTableFormat() const;
+
+  CentersTableFormat GetCentersTableFormat() const;
+
+  bool HasIsolines() const;
+
+private:
+  Format GetFormat() const { return m_version.GetFormat(); }
+  uint32_t GetVersion() const { return m_version.GetVersion(); }
+
+  MwmVersion m_version;
+};
+
+std::string DebugPrint(MwmTraits::SearchIndexFormat format);
+std::string DebugPrint(MwmTraits::HouseToStreetTableFormat format);
+std::string DebugPrint(MwmTraits::CentersTableFormat format);
+}  // namespace version