• ConstraintType is now an enum and so it's annoying to add VERY_SOFT etc (you can't reuse the ConstraintOccurrence implementations).
• ConstraintType should not make a difference between positive and negative hard constraints
• ConstraintOccurrenceTotal should give domain and api support to understand and enumerate the total of the rules.

Think about:

• new IntConstraintOccurrenceTotal(int level, String ruleId, boolean positiveOrNegative)
• myIntConstraintOccurrenceTotal.createOcccurence(weight, causes)
• LevelBasedScore (instead of HardAndSoftScore?)