private static Properties ReadProperties()

in src/Proton/Codec/Decoders/Messaging/PropertiesTypeDecoder.cs [68:143]
66 lines of code
18 McCabe index (conditional complexity)

      private static Properties ReadProperties(IProtonBuffer buffer, IDecoderState state, IListTypeDecoder listDecoder)
      {
         Properties result = new();

         _ = listDecoder.ReadSize(buffer, state);
         int count = listDecoder.ReadCount(buffer, state);

         // Don't decode anything if things already look wrong.
         if (count < MinPropertiesListEntries)
         {
            throw new DecodeException("Not enough entries in Properties list encoding: " + count);
         }

         if (count > MaxPropertiesListEntries)
         {
            throw new DecodeException("To many entries in Properties list encoding: " + count);
         }

         for (int index = 0; index < count; ++index)
         {
            // Peek ahead and see if there is a null in the next slot, if so we don't call
            // the setter for that entry to ensure the returned type reflects the encoded
            // state in the modification entry.
            bool nullValue = buffer.GetByte(buffer.ReadOffset) == (byte)EncodingCodes.Null;
            if (nullValue)
            {
               buffer.ReadByte();
               continue;
            }

            switch (index)
            {
               case 0:
                  result.MessageId = state.Decoder.ReadObject(buffer, state);
                  break;
               case 1:
                  result.UserId = state.Decoder.ReadBinary(buffer, state);
                  break;
               case 2:
                  result.To = state.Decoder.ReadString(buffer, state);
                  break;
               case 3:
                  result.Subject = state.Decoder.ReadString(buffer, state);
                  break;
               case 4:
                  result.ReplyTo = state.Decoder.ReadString(buffer, state);
                  break;
               case 5:
                  result.CorrelationId = state.Decoder.ReadObject(buffer, state);
                  break;
               case 6:
                  result.ContentType = state.Decoder.ReadSymbol(buffer, state)?.ToString() ?? null;
                  break;
               case 7:
                  result.ContentEncoding = state.Decoder.ReadSymbol(buffer, state)?.ToString() ?? null;
                  break;
               case 8:
                  result.AbsoluteExpiryTime = state.Decoder.ReadTimestamp(buffer, state) ?? 0;
                  break;
               case 9:
                  result.CreationTime = state.Decoder.ReadTimestamp(buffer, state) ?? 0;
                  break;
               case 10:
                  result.GroupId = state.Decoder.ReadString(buffer, state);
                  break;
               case 11:
                  result.GroupSequence = state.Decoder.ReadUnsignedInteger(buffer, state) ?? 0;
                  break;
               case 12:
                  result.ReplyToGroupId = state.Decoder.ReadString(buffer, state);
                  break;
            }
         }

         return result;
      }