public static void ReadFromReader(this ICommand command, BigEndianReader read)
{
var properties = command.GetType().GetProperties()
.Where(f => f.GetCustomAttribute <CommandFieldAttribute>() != null)
.Select(f => new { Property = f, Metadata = f.GetCustomAttribute <CommandFieldAttribute>() });
while (true)
{
byte fieldID = read.ReadByte();
if (fieldID == 255 || read.PeekChar() < 0)
{
break;
}
ushort fieldLength = read.ReadUInt16();
var fieldInfo = properties.First(f => f.Metadata.FieldID == fieldID);
var serializationType = fieldInfo.Property.PropertyType;
if (fieldInfo.Metadata.SerializeAs != null)
{
serializationType = fieldInfo.Metadata.SerializeAs;
}
if (Nullable.GetUnderlyingType(serializationType) != null)
{
serializationType = Nullable.GetUnderlyingType(serializationType);
}
if (fieldInfo.Metadata.Repeated)
{
if (!serializationType.GetInterfaces().Any(i => i == typeof(IList)))
{
throw new Exception("Repeated field is not of a list type");
}
var listType = serializationType.GetInterfaces().First(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IList <>));
var internalSerializationType = listType.GetGenericArguments()[0];
var cur = fieldInfo.Property.GetValue(command) as IList;
if (!serializationType.IsArray)
{
if (cur == null)
{
cur = (IList)Activator.CreateInstance(typeof(List <>).MakeGenericType(internalSerializationType));
}
cur.Add(read.ReadOfType(fieldLength, internalSerializationType));
}
else
{
if (cur == null)
{
cur = Array.CreateInstance(internalSerializationType, 1);
}
else
{
var arr = Array.CreateInstance(internalSerializationType, cur.Count + 1);
Array.Copy((Array)cur, arr, cur.Count);
cur = arr;
}
cur[cur.Count - 1] = read.ReadOfType(fieldLength, internalSerializationType);
}
fieldInfo.Property.SetValue(command, cur);
}
else
{
var value = read.ReadOfType(fieldLength, serializationType);
if (serializationType != fieldInfo.Property.PropertyType)
{
if (!fieldInfo.Property.PropertyType.IsEnum)
{
value = Convert.ChangeType(value, fieldInfo.Property.PropertyType);
}
}
fieldInfo.Property.SetValue(command, value);
}
}
}
