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using Google.Protobuf;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Tango.PMR.Common;
namespace Tango.PMR
{
/// <summary>
/// Contains helper class for encoding and decoding PMR messages.
/// </summary>
public static class MessageFactory
{
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>() where T : IMessage<T>
{
TangoMessage<T> tango = new TangoMessage<T>(Activator.CreateInstance<T>(), ParseMessageType(typeof(T).Name));
return tango;
}
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>(T message) where T : IMessage<T>
{
TangoMessage<T> tango = CreateTangoMessage<T>();
tango.Message = message;
return tango;
}
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>(String token) where T : IMessage<T>
{
TangoMessage<T> tango = CreateTangoMessage<T>();
tango.Container.Token = token;
return tango;
}
/// <summary>
/// Creates a new <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static TangoMessage<T> CreateTangoMessage<T>(T message, String token) where T : IMessage<T>
{
TangoMessage<T> tango = CreateTangoMessage<T>(token);
tango.Message = message;
return tango;
}
/// <summary>
/// Parses the specified <see cref="MessageContainer"/> bytes to <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data">The data.</param>
/// <returns></returns>
public static TangoMessage<T> ParseTangoMessage<T>(byte[] data) where T : IMessage<T>
{
MessageContainer container = MessageContainer.Parser.ParseFrom(data);
MessageParser<T> parser = new MessageParser<T>(() => Activator.CreateInstance<T>());
TangoMessage<T> tango = new TangoMessage<T>(parser.ParseFrom(container.Data), container.Type);
return tango;
}
public static Object ParseTangoMessageAgnostic(byte[] data)
{
MessageContainer container = MessageContainer.Parser.ParseFrom(data);
IMessage message = ParseMessageFromContainer(container);
return typeof(MessageFactory).GetMethod("ParseTangoMessage",BindingFlags.Public | BindingFlags.Static).MakeGenericMethod(message.GetType()).Invoke(null, new[] { data });
}
/// <summary>
/// Parses the specified <see cref="MessageContainer"/> bytes to <see cref="TangoMessage{T}"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data">The data.</param>
/// <returns></returns>
public static T ParseMessageFromContainer<T>(MessageContainer container) where T : IMessage<T>
{
MessageParser<T> parser = new MessageParser<T>(() => Activator.CreateInstance<T>());
return parser.ParseFrom(container.Data);
}
/// <summary>
/// Parses the container.
/// </summary>
/// <param name="container">The container.</param>
/// <returns></returns>
public static IMessage ParseMessageFromContainer(MessageContainer container)
{
var type = typeof(MessageFactory).Assembly.GetTypes().ToList().SingleOrDefault(x => x.Name == container.Type.ToOriginalName());
MessageParser parser = type.GetProperty("Parser").GetValue(container) as MessageParser;
return parser.ParseFrom(container.Data);
}
/// <summary>
/// Parses the container partial.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data">The data.</param>
/// <returns></returns>
public static MessageContainer ParseContainer(byte[] data)
{
MessageContainer container = MessageContainer.Parser.ParseFrom(data);
return container;
}
/// <summary>
/// Parses the container partial.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="data">The data.</param>
/// <returns></returns>
public static MessageContainer ParseContainerJson(byte[] data)
{
MessageContainer container = MessageContainer.Parser.ParseJson(Encoding.UTF8.GetString(data));
return container;
}
public static MessageType ParseMessageType(String str)
{
MessageType t;
if (Enum.TryParse<MessageType>(str, true, out t))
{
return t;
}
else
{
throw new InvalidCastException("Could not parse message type " + str);
}
}
}
}
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