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#pragma once
#include "coding/multilang_utf8_string.hpp"
#include "coding/reader.hpp"
#include "std/algorithm.hpp"
#include "std/limits.hpp"
#include "std/map.hpp"
#include "std/string.hpp"
#include "std/vector.hpp"
namespace feature
{
class Metadata
{
public:
/// @note! Do not change values here.
/// Add new types to the end of list, before FMD_COUNT.
enum EType
{
FMD_CUISINE = 1,
FMD_OPEN_HOURS = 2,
FMD_PHONE_NUMBER = 3,
FMD_FAX_NUMBER = 4,
FMD_STARS = 5,
FMD_OPERATOR = 6,
FMD_URL = 7,
FMD_WEBSITE = 8,
FMD_INTERNET = 9,
FMD_ELE = 10,
FMD_TURN_LANES = 11,
FMD_TURN_LANES_FORWARD = 12,
FMD_TURN_LANES_BACKWARD = 13,
FMD_EMAIL = 14,
FMD_POSTCODE = 15,
FMD_WIKIPEDIA = 16,
FMD_MAXSPEED = 17,
FMD_FLATS = 18,
FMD_COUNT
};
static_assert(FMD_COUNT <= 255, "Meta types count is limited to one byte.");
/// Empty value drops (clears) corresponding type.
void Set(EType type, string const & value)
{
auto found = m_metadata.find(type);
if (found == m_metadata.end())
{
if (!value.empty())
m_metadata[type] = value;
}
else
{
if (value.empty())
m_metadata.erase(found);
else
found->second = value;
}
}
/// Synonym of Set(type, "").
void Drop(EType type)
{
Set(type, "");
}
string Get(EType type) const
{
auto const it = m_metadata.find(type);
return (it == m_metadata.end()) ? string() : it->second;
}
vector<EType> GetPresentTypes() const
{
vector<EType> types;
types.reserve(m_metadata.size());
for (auto const & item : m_metadata)
types.push_back(item.first);
return types;
}
inline bool Empty() const { return m_metadata.empty(); }
inline size_t Size() const { return m_metadata.size(); }
string GetWikiURL() const;
template <class ArchiveT> void SerializeToMWM(ArchiveT & ar) const
{
for (auto const & e : m_metadata)
{
// set high bit if it's the last element
uint8_t const mark = (&e == &(*m_metadata.crbegin()) ? 0x80 : 0);
uint8_t elem[2] = {static_cast<uint8_t>(e.first | mark),
static_cast<uint8_t>(min(e.second.size(), (size_t)kMaxStringLength))};
ar.Write(elem, sizeof(elem));
ar.Write(e.second.data(), elem[1]);
}
}
template <class ArchiveT> void DeserializeFromMWM(ArchiveT & ar)
{
uint8_t header[2] = {0};
char buffer[kMaxStringLength] = {0};
do
{
ar.Read(header, sizeof(header));
ar.Read(buffer, header[1]);
m_metadata[ToType(header[0] & 0x7F)].assign(buffer, header[1]);
} while (!(header[0] & 0x80));
}
template <class ArchiveT> void Serialize(ArchiveT & ar) const
{
uint8_t const sz = m_metadata.size();
WriteToSink(ar, sz);
for (auto const & it : m_metadata)
{
WriteToSink(ar, static_cast<uint8_t>(it.first));
utils::WriteString(ar, it.second);
}
}
template <class ArchiveT> void Deserialize(ArchiveT & ar)
{
uint8_t const sz = ReadPrimitiveFromSource<uint8_t>(ar);
ASSERT_LESS_OR_EQUAL(sz, FMD_COUNT, ());
for (size_t i = 0; i < sz; ++i)
{
EType const key = ToType(ReadPrimitiveFromSource<uint8_t>(ar));
string value;
utils::ReadString(ar, value);
m_metadata.insert(make_pair(key, value));
}
}
private:
static EType ToType(uint8_t key)
{
ASSERT(key > 0 && key < FMD_COUNT, (key));
return static_cast<EType>(key);
}
enum { kMaxStringLength = 255 };
map<EType, string> m_metadata;
};
}
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