/// <summary>
/// Sets both the 'sequence' and 'sequencetype' attributes based on the specified value.
/// </summary>
public static CloudEvent SetSequence(this CloudEvent cloudEvent, object value)
{
if (value is null)
{
cloudEvent[SequenceAttribute] = null;
cloudEvent[SequenceTypeAttribute] = null;
}
else if (value is int)
{
// TODO: Validation? Would be nice to get a sort of "surrogate" attribute here...
cloudEvent[SequenceAttribute] = SurrogateIntegerAttribute.Format(value);
cloudEvent[SequenceTypeAttribute] = IntegerType;
}
else
{
throw new ArgumentException($"No sequence type known for type {value.GetType()}");
}
return(cloudEvent);
}
/// <summary>
/// Retrieves the <see cref="SequenceAttribute"/> value from the event,
/// parsing it according to the value of <see cref="SequenceTypeAttribute"/>.
/// If no type is present in the event, the string value is
/// returned without further transformation.
/// </summary>
public static object GetSequenceValue(this CloudEvent cloudEvent)
{
var sequence = GetSequenceString(cloudEvent);
if (sequence is null)
{
return(null);
}
var type = GetSequenceType(cloudEvent);
if (type == null)
{
return(sequence);
}
if (type == IntegerType)
{
return(SurrogateIntegerAttribute.Parse(sequence));
}
throw new InvalidOperationException($"Unknown sequence type '{type}'");
}