001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019package org.apache.causeway.viewer.commons.applib.services.menu;
020
021import org.apache.causeway.viewer.commons.applib.services.menu.model.MenuAction;
022import org.apache.causeway.viewer.commons.applib.services.menu.model.MenuDropdown;
023
024/**
025 * Depth first visitor of the nav-bar model.
026 */
027public interface MenuVisitor {
028
029    void onTopLevel(MenuDropdown menuDropdown);
030    void onMenuAction(MenuAction menuAction);
031
032    void onSectionSpacer();
033    /**
034     * @param named - not null and not empty
035     */
036    void onSectionLabel(String named);
037
038}