content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   */
  package org.apache.causeway.viewer.wicket.ui.components.menuable;
  
  import java.util.stream.Stream;
  
  import org.apache.wicket.model.IModel;
  import org.apache.wicket.model.Model;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.viewer.wicket.model.links.Menuable;
  import org.apache.causeway.viewer.wicket.ui.panels.PanelAbstract;
  
  /**
   * Common panel for drop-downs and sub-menus.
   */
  public abstract class MenuablePanelAbstract
  extends PanelAbstract<Can<? extends Menuable>, IModel<Can<? extends Menuable>>> {
  
      private static final long serialVersionUID = 1L;
  
      protected MenuablePanelAbstract(final String id, final Can<? extends Menuable> menuables) {
          super(id, Model.of(menuables));
      }
  
      protected final <T extends Menuable> Stream<T> streamMenuables(final Class<T> linkType) {
          return getModelObject().stream()
                  .filter(linkType::isInstance)
                  .map(linkType::cast);
      }
  
  }
  