[metrics-bugs] #22695 [Metrics/metrics-lib]: descriptor file processing

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#22695: descriptor file processing
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 Reporter:  iwakeh               |          Owner:  metrics-team
     Type:  defect               |         Status:  new
 Priority:  High                 |      Milestone:  metrics-lib 2.0.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by iwakeh):

 First thoughts about possible answers:

 1) Several answers:
    i) some form of exception?
    ii) warning and use the descriptorFile given?
 2) Set `fileName = descriptorFile.getName()`.
 3) More tricky:
    i) use `descriptorFile = new File(fileName)` is potentially problematic
 b/c there is no such file.
    ii) leave `descriptorFile = null` and forget about the given filename?
    iii) add getDescriptorFilename() to the Descriptor interface?
    iv) some form of exception?
 4) some form of exception?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22695#comment:2>
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