Allow EnumSetSerializer to work with empty EnumSets

[GoogleCodeExporter]

I was rather surprised by the original error, so I made a minor revision to 
allow the class of the contained Enum to be determined. As long as the Enum has 
at least one definition, using the complement of an empty set works.

EnumSet.allOf(Enum) == EnumSet.complementOf(EnumSet.noneOf(Enum))

Unfortunately, I could not get the EnumMap to behave in a similar fashion due 
to the constructor requiring a class object and EnumSet.copyOf(Collection) 
doesn't work if the collection is empty :(

I hate Java generics...

Original issue reported on code.google.com by Devin.Ch...@gmail.com on 25 Sep 2012 at 11:52

Attachments:

• DefaultSerializers.java.patch

[GoogleCodeExporter]

Fixed in r414. A dedicated JUnit test was added.

Original comment by romixlev on 2 Oct 2013 at 8:14

• Changed state: Fixed