FCC/Devices/Terminals/FuRen_Sinopec_IcCardReader/MessageTemplateLookup.cs

using Edge.Core.Parser.BinaryParser;
using Edge.Core.Parser.BinaryParser.MessageEntity;
using Edge.Core.Parser.BinaryParser.Util;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace FuRen_Sinopec_IcCardReader
{
    public class MessageTemplateLookup : IMessageTemplateLookup
    {
        /// <summary>
        /// Gets the default singleton instance of type MessageTemplateLookup.
        /// </summary>
        public static MessageTemplateLookup Default { get; } = new MessageTemplateLookup();

        /// <summary>
        /// Create a message entity based on input whole message raw bytes which is: 2bytes Len + 1 byte AppId + 1 byte SSK 
        ///     + variable length message code + variable length message body
        /// </summary>
        /// <param name="bytes">whole message raw bytes</param>
        /// <returns>new created message entity</returns>
        public MessageTemplateBase GetMessageTemplateByRawBytes(byte[] bytes)
        {
            // from protocol definition, the msg body started at 7th byte, and the 7th bytes is always the msg type code.
            var msgHandleCode = bytes.Skip(6).First();
            switch (msgHandleCode)
            {
                //case 0x30:
                //    return new PumpGenericInquiryCommand();
                case 0x31:
                    return new PumpStateChangeCommand();
                case 0x32:
                    return new PumpNotifyTransactionDoneCommand();
                case 0x3A:
                    return new FuRen_PcActivelyReadPumpConfigurationInfoResponse();
            }

            throw new ArgumentException("Can't find correlated message entity type for incoming raw message bytes: " + bytes.Select(s => s.ToString("X").PadLeft(2, '0')).Aggregate((n, acc) => n + " " + acc));
        }
    }
}