code: public SortedSet<PackageDoc> findPackagesFromClassesInJavaDocRun() {
  
          final SortedSet<PackageDoc> toReturn = new TreeSet<>(Comparators.PACKAGE_NAME_COMPARATOR);
          final ClassDoc[] currentExecutionClasses = classes();
  
          if (currentExecutionClasses != null) {
  
              Arrays.stream(currentExecutionClasses)
                      .map(ProgramElementDoc::containingPackage)
                      .forEach(toReturn::add);
          }
  
          // All Done.
          return toReturn;
      }
docs: Finds all PackageDoc objects from the classes in this JavaDoc execution.
  
  @return a non-null (but possibly empty) SortedSet containing all {@link PackageDoc}s from the current execution.