non-API classes displayed by jrt filesystem

[Philippe Marschall]

Hi

I'm toying around with the jrt filesystem [1]. I noted that non-API 
classes are shown for java modules (see attachment). I assume this is 
because jrt currently reports all classes in a module, not just the 
exported ones (and these classes are not exported). Assuming this is the 
intended behavior this is a bit inconvenient. One would have to parse 
the module-info.class to find out what is exported. Some possible 
solutions could include:

  * have a file attribute specific to the jrt filesystem "exported" to 
report whether a file/package is exported
  * have two subtrees in a module, eg. "all" and "exported"

  [1] https://github.com/marschall/jrt-explorer

Cheers
Philippe
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