code: public boolean add(SatConstraintBuilder c) {
          if (this.builders.containsKey(c.getIdentifier())) {
              return false;
          }
          this.builders.put(c.getIdentifier(), c);
          return true;
      }
docs: Add a constraint builder to the catalog.
  There must not be another builder with the same identifier in the catalog
  
  @param c the constraint to add
  @return true if the builder has been added.