An alternative to all of the boolean-valued isXXX, isNotXXX methods might be to
introduce an integer-valued classification method to return the rank of a
string according to the ordering
null < "" < whitespace only (but positive length) < "non-trivial".
The syntax would be less natural (maybe to the point of making it
worthless ;-)), but one method (and maybe some constants) would suffice and the
definition would be unambiguous.
Something like:
if ((StringUtils.contentClass(myString) <= StringUtils.EMPTY_CONTENT)) or
if ((StringUtils.contentClass(myString) <= StringUtils.contentClass(""))
Though I can't think of immediate uses for this off the top of head, the
ability to compare content classes as in the second example above might turn
out to be useful.
Just a thought. Admittedly a bit "off thread"...
Phil
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