[tor-bugs] #17824 [metrics-lib]: switch on string instead of many if-else with String comparison

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#17824: switch on string instead of many if-else with String comparison
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 Reporter:  iwakeh       |          Owner:  karsten
     Type:  enhancement  |         Status:  accepted
 Priority:  Low          |      Milestone:
Component:  metrics-lib  |        Version:
 Severity:  Minor        |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #17822       |         Points:
  Sponsor:               |
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Comment (by iwakeh):

 {{{startsWith()}} if-else-chains should also be changed to switch. The
 startsWith() for parsing should not be necessary.

 In DescriptorImpl it could be achieved by splitting the first line and use
 the String after @type (if there is any) for the switch-stmt.
 I also would suggest moving the version handling to the parser classes.
 Some (like TorPerfResultImpl) verify the version anyway and could if need
 arises handle several versions in future. Thus there is no need for
 DescriptorImpl to check the versions.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17824#comment:2>
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