module-info platform dependencies

[Mark Reinhold]

> Date: Fri, 15 May 2009 09:21:53 -0700
> From: jonathan.gibbons at sun.com

> On May 15, 2009, at 9:14 AM, Mark Reinhold wrote:
>> The former, of course.  How about this:
>> 
>>    public class org.openjdk.jigsaw.Platform {
>>        public static boolean isPlatformModuleName(String mn);
>>        public static ModuleIdQuery defaultPlatformModule(int target);
>>    }
> 
> Either that (int target) or a nice friendly type-safe enum.

Okay.

    public class org.openjdk.jigsaw.Platform {
        public static boolean isPlatformModuleName(String mn);
        public static enum Target {
            SEVEN;
            public static boolean isKnown(int target);
            public static Target valueOf(int target);
        }
        public static ModuleIdQuery defaultPlatformModule(Target t);
    }

>> I do think that the default should be upon the whole platform.  That's
>> effectively what it is today.  If you want something smaller then you
>> can specify it, or maybe use a tool which can analyze your class
>> dependences, identify the smallest suitable platform module, and
>> insert that into your module-info source file.
> 
> The default today is that if I compile something like Hello World, it
> will run on any version of the platform, even the smallest. (Well,
> perhaps not JavaCard.)

Ah, I see what you mean.  Need to think about this more, but offhand it
still seems like more of a tooling issue, kind of like minimizing import
declarations.  Minimization of platform dependences could also be done
much later, as part of module packaging.

- Mark