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.testdomain.fixtures;
  
  import java.util.Optional;
  
  import org.apache.causeway.applib.annotation.DomainObject;
  import org.apache.causeway.applib.annotation.DomainObjectLayout;
  import org.apache.causeway.applib.annotation.Nature;
  import org.apache.causeway.applib.annotation.ObjectSupport;
  import org.apache.causeway.applib.annotation.Programmatic;
  import org.apache.causeway.applib.annotation.Property;
  import org.apache.causeway.applib.annotation.PropertyLayout;
  import org.apache.causeway.applib.annotation.Where;
  import org.apache.causeway.core.metamodel.specloader.SpecificationLoader;
  import org.apache.causeway.testdomain.util.dto.IBook;
  
  /**
   * Simply acts as wrapper of a book entity.
   * <p>
   * Introduced to test whether view-models that have references to entities,
   * do properly re-fetch those (particularly on AJAX requests).
   */
  @DomainObject(nature = Nature.VIEW_MODEL)
  @DomainObjectLayout(cssClassFa = "book-bookmark")
  public interface BookView<T extends IBook> {
  
      @ObjectSupport
      default public String title() {
          return String.format("%s (%s)", getName(), getEntityState());
      }
  
      @Property
      @PropertyLayout(hidden = Where.EVERYWHERE)
      T getBook();
  
      @Property
      public default String getName() {
          return Optional.ofNullable(getBook())
                  .map(IBook::getName)
                  .orElse("no book referenced");
      }
  
      @Property
      public default String getEntityState() {
          return Optional.ofNullable(getBook())
                  .map(book->{
                      var spec = specLoader().specForTypeElseFail(getBook().getClass());
                      var entityFacet = spec.entityFacetElseFail();
                      var entityState = entityFacet.getEntityState(book);
                      return entityState.name();
                  })
                  .orElse("no book referenced");
      }
  
      @Programmatic
      SpecificationLoader specLoader();
  
  }