Optional.orElseChain ?

[Remi Forax]

Hi guys,
I was trying to write a code that uses Optional and I think one method 
is missing.

Let suppose I want to load a type (like a class, an interface, etc) that 
can come
either by reflection, or by using ASM.
I will write an interface TypeProvider that is able to load a Type and
i will chain the different type providers like this:

  TypeProvider asmTypeProvider = ...
  TypeProvider reflectionTypeProvider = ...
  TypeProvider provider =
    asmTypeProvider.chain(reflectionTypeProvider).orFail();

so I've implemented TypeProvider like this:

public interface TypeProvider {
  public Optional<Type> loadType(String name);

  public default TypeProvider chain(TypeProvider provider) {
    return name -> {
      Optional<Type> type = loadType(name);
      return type.isPresent()? type: provider.loadType(name);
    };
  }

  public default TypeProvider orFail() {
    return chain(fail());
  }

  public static TypeProvider fail() {
    return name -> Optional.empty();
  }
}

As you can see the code is not bad but the code of chain() could be 
simplified
if there was a way on Optional to call a Supplier of Optional if an 
Optional is empty.
Currently, orElse() takes a value, orElseGet takes a lambda that will 
return a value
and there is no method that takes a lambda and return an Optional
(like flatMap but but with a supplier that will be called if the 
Optional is empty).

If we add the method orElseChain(Supplier<? extends Optional<T>> supplier)
perhaps with a better name ?, then the code of chain is better:

  public default TypeProvider chain(TypeProvider provider) {
    return name -> loadType(name).orElseChain(() -> 
provider.loadType(name));
  }

Am i the only one to think that this method is missing ?

regards,
Rémi