public static <T> Supplier<T> method(
Type<T> returnType, Method factory, Object instance, Parameter<?>... parameters) {
if (!Type.returnType(factory).isAssignableTo(returnType)) {
throw new IllegalArgumentException(
"The factory methods methods return type `"
+ Type.returnType(factory)
+ "` is not assignable to: "
+ returnType);
}
if (instance != null && factory.getDeclaringClass() != instance.getClass()) {
throw new IllegalArgumentException(
"The factory method and the instance it is invoked on have to be the same class.");
}
Argument<?>[] arguments = Argument.arguments(Type.parameterTypes(factory), parameters);
return new FactoryMethodSupplier<T>(returnType, factory, instance, arguments);
}
