I have an idea for a Map that I think would fit nicely in the commons
collections library. The idea is to add a method
Set keySetForValue(Object value)
that would return the set of key's that are mapped to the given value. For
example:
map.put("1", "2");
map.put("2", "1");
map.put("3", "3");
map.put("4", "1");
map.keySetForValue("1") returns a set containing {"2", "4"}.
I've often found the need for doing this kind of reverse lookup when using maps
for 1-to-N relationships. If this sounds like something that fits within the
scope of the commons collections project, let me know and I'll commit an
initial implementation.
-Ryan
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