private void computeViolationsPerSeverities(DecoratorContext context) {
    Multiset<RulePriority> severitiesBag = HashMultiset.create();
    for (Violation violation : context.getViolations()) {
      severitiesBag.add(violation.getSeverity());
    }

    for (RulePriority severity : RulePriority.values()) {
      Metric metric = SeverityUtils.severityToViolationMetric(severity);
      if (context.getMeasure(metric) == null) {
        Collection<Measure> children = context.getChildrenMeasures(MeasuresFilters.metric(metric));
        int sum = MeasureUtils.sum(true, children).intValue() + severitiesBag.count(severity);
        context.saveMeasure(metric, (double) sum);
      }
    }
  }