ConcurrentHashMap/ConcurrentMap/Map.compute

[Doug Lea]

I placed a full candidate version of Map.java at
http://gee.cs.oswego.edu/dl/wwwtmp/apis/Map.java

At the moment I can't compile or javadoc this under current
setup (working on it...) but if anyone wants to do so please
let me know of problems. Otherwise, feel free to check in.

I kept the four names, computeIfAbsent, computeIfPresent,
compute, and merge. I agree that these are not wonderful
but our experience with the many CHMV8 users is that people
seem OK with them. Two flurries of traffic didn't arrive
at anything a lot better. The main constraint is that
many people are familiar with "computeIfAbsent",
and the other names mostly fall out from there.

I included (and added spec for) forEach(BiBlock) that is
in the current lambda version. Not completely sure about
spec though. Are there explicit seq/par versions?


-Doug