Task <bool> IRoommates.HasUserAsync(IUserProfile user)
{
if (null == user)
{
throw new ArgumentNullException(nameof(user));
}
var id = user.GetPrimaryKey();
return(Task.FromResult(State.Users.Exists(roommate => SameUser(roommate, id))));
}
async Task <bool> IRoommates.AddUserAsync(IUserProfile user)
{
if (null == user)
{
throw new ArgumentNullException(nameof(user));
}
var id = user.GetPrimaryKey();
if (State.Users.Exists(roommate => SameUser(roommate, id)))
{
return(false);
}
State.Users.Add(user);
await WriteStateAsync();
return(true);
}
async Task <bool> IRoommates.RemoveUserAsync(IUserProfile user)
{
if (null == user)
{
throw new ArgumentNullException(nameof(user));
}
var id = user.GetPrimaryKey();
var index = State.Users.FindIndex(roommate => SameUser(roommate, id));
if (index < 0)
{
return(false);
}
State.Users.RemoveAt(index);
await WriteStateAsync();
return(true);
}
private static bool SameUser(IUserProfile user, Guid id)
{
return(user.GetPrimaryKey() == id);
}
