@Override
  public void acceptAlwaysPredicate(AlwaysPredicate predicate) {
    lastVisited = predicate;
  }
Obtain a list of simplified predicates based on the rules described in the class documentation.

@return a list of simplified predicates
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/SimplifyingPredicateVisitor.java