Getting the automatic module name of non-modular JAR

[Remi Forax]

If you want an Optional, you can use findFirst() on a stream,
  Optional<ModuleReference> ref = ModuleFinder.of( jar ).findAll().stream().findFirst();

Rémi

----- Mail original -----
> De: "Gunnar Morling" <gunnar at hibernate.org>
> À: "Alan Bateman" <Alan.Bateman at oracle.com>
> Cc: "jigsaw-dev" <jigsaw-dev at openjdk.java.net>
> Envoyé: Mardi 25 Avril 2017 09:10:45
> Objet: Re: Getting the automatic module name of non-modular JAR

> I see; thanks, Alan.
> 
> I wanted to avoid using a regex or similar, in order to make sure the
> JDK's own automatic naming rules are applied instead of
> "re-implementing" them. I was kinda hoping for a method like
> 
>    Path jar = ...;
>    Optional<ModuleReference> ref = ModuleReference.of( jar );
> 
> 
> 2017-04-25 8:49 GMT+02:00 Alan Bateman <Alan.Bateman at oracle.com>:
>> On 24/04/2017 21:23, Gunnar Morling wrote:
>>
>>> Hi,
>>>
>>> Given a non-modular JAR (e.g. represented as Path), what's the easiest
>>> way to obtain the automatic module name derived for this JAR?
>>
>> If you just want the name then it might be more efficient to do it with a
>> regular expression.
>>
>>>
>>> I found the following:
>>>
>>>      Path nonModularJar = ...;
>>>      String automaticModuleName = ModuleFinder.of( nonModularJar )
>>>          .findAll()
>>>          .iterator()
>>>          .next()
>>>          .descriptor()
>>>          .name();
>>>
>>> Is this the best I can do?
>>>
>>> More generally speaking, is using ModuleFinder with a single path the
>>> only way to obtain a ModuleReference/ModuleDescriptor for a specific
>>> JAR?
>>
>> Yes, ModuleFinder is the only way (it might be more succulent to use stream
>> + findFirst but that is just detail). If you are only interested in the name
>> then you could of course open the JAR file. If it contains module-info.class
>> then read it with ModuleDescriptor.read, otherwise use a regex to derive the
>> name.
>>
> > -Alan