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.pages.standalonecollection;
  
  import java.util.List;
  import java.util.Optional;
  import java.util.function.BiFunction;
  import java.util.function.Supplier;
  import java.util.stream.Collectors;
  
  import org.apache.wicket.Component;
  import org.apache.wicket.authroles.authorization.strategies.role.annotations.AuthorizeInstantiation;
  
  import org.apache.causeway.applib.services.bookmark.Bookmark;
  import org.apache.causeway.applib.services.publishing.spi.PageRenderSubscriber;
  import org.apache.causeway.applib.services.user.UserMemento;
  import org.apache.causeway.commons.binding.Observable;
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.viewer.commons.model.components.UiComponentType;
  import org.apache.causeway.viewer.wicket.model.models.coll.CollectionModelStandalone;
  import org.apache.causeway.viewer.wicket.model.util.PageParameterUtils;
  import org.apache.causeway.viewer.wicket.ui.pages.PageAbstract;
  
  /**
   * Web page representing an action invocation.
   */
  @AuthorizeInstantiation(UserMemento.AUTHORIZED_USER_ROLE)
  public class StandaloneCollectionPage extends PageAbstract {
  
      private static final long serialVersionUID = 1L;
  
      private final CollectionModelStandalone collectionModel;
  
      /**
       * For use with {@link Component#setResponsePage(org.apache.wicket.request.component.IRequestablePage)}
       */
      public StandaloneCollectionPage(final CollectionModelStandalone collectionModel) {
          super(PageParameterUtils.newPageParameters(),
                  collectionModel.getName(),
                  UiComponentType.STANDALONE_COLLECTION);
          this.collectionModel = collectionModel;
  
          addChildComponents(themeDiv, collectionModel);
          addBookmarkedPages(themeDiv);
      }
  
      @Override
      public void onRendering(final Can<PageRenderSubscriber> objectRenderSubscribers) {
          onRenderingOrRendered(objectRenderSubscribers, (pageRenderSubscriber, bookmarkListSupplier) -> {
              pageRenderSubscriber.onRenderingCollection(bookmarkListSupplier);
              return null;
          });
      }
  
      @Override
      public void onRendered(final Can<PageRenderSubscriber> objectRenderSubscribers) {
          onRenderingOrRendered(objectRenderSubscribers, (pageRenderSubscriber, bookmarkListSupplier) -> {
              pageRenderSubscriber.onRenderedCollection(bookmarkListSupplier);
              return null;
          });
      }
  
      private void onRenderingOrRendered(
              final Can<PageRenderSubscriber> objectRenderSubscribers,
              final BiFunction<PageRenderSubscriber, Supplier<List<Bookmark>>, Void> handler) {
  
          if(objectRenderSubscribers.isEmpty()) {
              return;
          }
  
          Supplier<List<Bookmark>> listSupplier = () -> {
  
              final var dataTableInteractive = collectionModel.getObject();
              Observable<Can<ManagedObject>> dataElements = dataTableInteractive.dataElementsObservable();
              Can<ManagedObject> managedObjects = dataElements.getValue();
  
              final var bookmarks =
                  managedObjects.stream()
                  .map(ManagedObject::getBookmark)
                  .filter(Optional::isPresent)
                  .map(Optional::get)
                  .collect(Collectors.toUnmodifiableList());
              return bookmarks;
          };
  
          objectRenderSubscribers
              .forEach(subscriber -> {
                  handler.apply(subscriber, listSupplier);
              });
      }
  
  }
  