/// <summary>
/// Constructs a FieldMask from the passed field numbers.
/// </summary>
/// <typeparam name="T">The type to validate the field paths against.</typeparam>
public static FieldMask FromFieldNumbers <T>(IEnumerable <int> fieldNumbers) where T : IMessage
{
var descriptor = Activator.CreateInstance <T>().Descriptor;
var mask = new FieldMask();
foreach (var fieldNumber in fieldNumbers)
{
var field = descriptor.FindFieldByNumber(fieldNumber);
if (field == null)
{
throw new ArgumentNullException($"{fieldNumber} is not a valid field number for {descriptor.Name}");
}
mask.Paths.Add(field.Name);
}
return(mask);
}
/// <summary>
/// Constructs a FieldMask for a list of field paths in a certain type.
/// </summary>
/// <typeparam name="T">The type to validate the field paths against.</typeparam>
public static FieldMask FromStringEnumerable <T>(IEnumerable <string> paths) where T : IMessage
{
var mask = new FieldMask();
foreach (var path in paths)
{
if (path.Length == 0)
{
// Ignore empty field paths.
continue;
}
if (typeof(T) != typeof(Empty) &&
!IsValid <T>(path))
{
throw new InvalidProtocolBufferException(path + " is not a valid path for " + typeof(T));
}
mask.Paths.Add(path);
}
return(mask);
}
/// <summary>
/// Checks whether paths in a given fields mask are valid.
/// </summary>
/// <typeparam name="T">The type to validate the field paths against.</typeparam>
public static bool IsValid <T>(FieldMask fieldMask) where T : IMessage
{
var descriptor = Activator.CreateInstance <T>().Descriptor;
return(IsValid(descriptor, fieldMask));
}