PIVOT-898 (but after the fix) , refactor some common (repeated) calculations in private methods, to start implementing the DRY principle even in some cases ... future work: maybe do even in other classes, and cache calculated values when set base values

git-svn-id: https://svn.apache.org/repos/asf/pivot/branches/2.0.x@1453782 13f79535-47bb-0310-9956-ffa450edef68