protected override RelationalTypeMapping? FindMapping()

in EFCore/src/Storage/Internal/MySQLTypeMappingSource.cs [228:321]
84 lines of code
23 McCabe index (conditional complexity)

    protected override RelationalTypeMapping? FindMapping(in RelationalTypeMappingInfo mappingInfo)
      => base.FindMapping(mappingInfo) ??
      FindRawMapping(mappingInfo)?.Clone(mappingInfo);

    private RelationalTypeMapping? FindRawMapping(RelationalTypeMappingInfo mappingInfo)
    {
      if (!_initialized)
      {
        Initialize();
        _initialized = true;
      }

      var clrType = mappingInfo.ClrType;
      var storeTypeName = mappingInfo.StoreTypeName;
      var storeTypeNameBase = mappingInfo.StoreTypeNameBase;

      if (storeTypeName != null)
      {
        if (_storeTypeMappings!.TryGetValue(storeTypeName, out var mapping))
        {
          return clrType == null
          ? mapping[0]
          : mapping.FirstOrDefault(m => m.ClrType == clrType);
        }

        if (_storeTypeMappings.TryGetValue(storeTypeNameBase!, out mapping))
        {
#if !NET8_0_OR_GREATER
          return clrType == null
          ? mapping[0].Clone(in mappingInfo)
          : mapping.FirstOrDefault(m => m.ClrType == clrType)?.Clone(in mappingInfo);
#else
          return clrType == null
          ? mapping[0].WithTypeMappingInfo(mappingInfo)
          : mapping.FirstOrDefault(m => m.ClrType == clrType)?.WithTypeMappingInfo(mappingInfo);
#endif
        }
      }

      if (clrType != null)
      {
        if (_clrTypeMappings!.TryGetValue(clrType, out var mapping))
        {
          if (mappingInfo.Precision.HasValue)
          {
            if (clrType == typeof(DateTime) ||
                    clrType == typeof(DateTimeOffset) ||
                    clrType == typeof(TimeSpan))
            {
#if !NET8_0_OR_GREATER
              return mapping.Clone(mappingInfo.Precision.Value, null);
#else
              return mapping.WithPrecisionAndScale(mappingInfo.Precision.Value, null);
#endif
            }
          }

          return mapping;
        }
        else if (clrType == typeof(string))
        {
          var isAnsi = mappingInfo.IsUnicode == false;
          var isFixedLength = mappingInfo.IsFixedLength == true;
          var size = mappingInfo.Size ?? (mappingInfo.IsKeyOrIndex ?
          Math.Min(MAXKEYLENGTH / (_options.CharSet!.byteCount * 2), 255)
          : null);

          if (size > 65_553 / _options.CharSet!.byteCount)
          {
            size = null;
            isFixedLength = false;
          }

          mapping = isFixedLength ? _charUnicode : size == null
          ? _longtextUnicode : _varcharUnicode;

#if !NET8_0_OR_GREATER 
          return size == null ? mapping : mapping.Clone($"{mapping.StoreTypeNameBase}({size})", size);
#else
          return size == null ? mapping : mapping.WithStoreTypeAndSize($"{mapping.StoreTypeNameBase}({size})", size);
#endif
        }
        else if (clrType == typeof(byte[]))
        {
          bool isFixedLength = mappingInfo.IsFixedLength == true;
          var size = mappingInfo.Size ?? (mappingInfo.IsKeyOrIndex ? MAXKEYLENGTH : null);
          return new MySQLByteArrayTypeMapping(
                size: size,
                fixedLength: isFixedLength);
        }
      }

      return null;
    }