internal override sealed MutationResult Mutate(IReadOnlyDictionary <FragmentKey, Fragment> state, FragmentKey key, Guid requester)
{
MutationResult result;
if (state.TryGetValue(key, out Fragment fragment))
{
if (!(fragment is T fragmentT))
{
log.Warning($"Can not {GetType().Name} a {typeof(T).Name} at fragment[{key.AsString()}], because that fragment is of type {fragment.GetType().Name}.");
return(MutationResult.FragmentTypeMismatchFailure);
}
result = Update(fragmentT, state, key, requester);
if (result == null)
{
log.Warning($"{GetType().Name}.Update returned null, which is not allowed.");
return(MutationResult.ResultNullFailure);
}
}
else
{
result = Insert(state, key, requester);
if (result == null)
{
log.Warning($"{GetType().Name}.Insert returned null, which is not allowed.");
return(MutationResult.ResultNullFailure);
}
}
return(result);
}
internal override MutationResult Mutate(IReadOnlyDictionary <FragmentKey, Fragment> state, FragmentKey key, Guid requester)
{
if (state.ContainsKey(key))
{
log.Warning($"Can not {GetType().Name} a {typeof(T).Name} at fragment[{key.AsString()}], because that fragment already exists.");
return(MutationResult.FragmentAlreadyExistsFailure);
}
InsertResult <T> result = Insert(state, key, requester);
if (result == null)
{
log.Warning($"{GetType()}.Insert returned null, while this is not allowed.");
return(MutationResult.ResultNullFailure);
}
return(result);
}
