<T> Iterable<T> view(T root, TreeTraverser<T> viewer) {
        return viewer.postOrderTraversal(root);
      }
    },
    BREADTH_FIRST {
      @Override
      <T> Iterable<T> view(T root, TreeTraverser<T> viewer) {
        return viewer.breadthFirstTraversal(root);
      }
    };

    abstract <T> Iterable<T> view(T root, TreeTraverser<T> viewer);
  }

  private Iterable<BinaryNode> view;

      <T> Iterable<T> view(T root, TreeTraverser<T> viewer) {
        return viewer.postOrderTraversal(root);
      }
    },
    BREADTH_FIRST {
      @Override
      <T> Iterable<T> view(T root, TreeTraverser<T> viewer) {
        return viewer.breadthFirstTraversal(root);
      }
    };

    abstract <T> Iterable<T> view(T root, TreeTraverser<T> viewer);
  }

  private Iterable<BinaryNode> view;

        // Test with multiple roles
        testUser.setRoleNames(new String[] { "admin", "user", "manager" });
        assertTrue(fessUserBean.hasRoles(new String[] { "admin" }));
        assertTrue(fessUserBean.hasRoles(new String[] { "user", "guest" }));
        assertTrue(fessUserBean.hasRoles(new String[] { "manager", "viewer" }));

        String[] roles = secured.value();
        assertNotNull(roles);
        assertEquals(0, roles.length);
    }

    // Test with special characters in roles
    @Secured({ "ROLE_USER-ADMIN", "ROLE_USER.VIEWER", "ROLE_USER_EDITOR", "ROLE$SPECIAL" })
    static class SpecialCharacterRolesClass {
    }

    public void test_specialCharactersInRoles() {

    }

    public void test_allFieldsCombination() {
        // Test with all fields populated
        String name = "complexUser";
        String[] roles = { "admin", "user", "viewer" };
        String[] groups = { "developers", "managers", "qa" };
        String[] permissions = { "read:all", "write:docs", "delete:own", "execute:scripts" };