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.core.runtimeservices.homepage;
  
  import java.util.Optional;
  
  import jakarta.annotation.PostConstruct;
  import jakarta.inject.Inject;
  import jakarta.inject.Named;
  
  import org.springframework.stereotype.Service;
  
  import org.apache.causeway.applib.annotation.HomePage;
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.applib.services.factory.FactoryService;
  import org.apache.causeway.applib.services.homepage.HomePageResolverService;
  import org.apache.causeway.core.config.beans.CausewayBeanTypeRegistry;
  import org.apache.causeway.core.metamodel.commons.ClassExtensions;
  import org.apache.causeway.core.runtimeservices.CausewayModuleCoreRuntimeServices;
  
  /**
   * Default implementation of {@link HomePageResolverService}, which uses the view model annotated with
   * {@link HomePage} as the home page.
   *
   * <p>
   *     If there is more than one such view model so annotated, then the one chosen is not defined
   *     (in effect, can be considered is randomly chosen).
   * </p>
   *
   * @since 2.0 {@index}
   */
  @Service
  @Named(CausewayModuleCoreRuntimeServices.NAMESPACE + ".HomePageResolverServiceDefault")
  @jakarta.annotation.Priority(PriorityPrecedence.MIDPOINT)
  public class HomePageResolverServiceDefault implements HomePageResolverService {
  
      private final FactoryService factoryService;
      private final CausewayBeanTypeRegistry causewayBeanTypeRegistry;
  
      private Optional<Class<?>> viewModelTypeForHomepage;
  
      @Inject
      public HomePageResolverServiceDefault(
              final FactoryService factoryService,
              final CausewayBeanTypeRegistry causewayBeanTypeRegistry) {
  
          this.factoryService = factoryService;
          this.causewayBeanTypeRegistry = causewayBeanTypeRegistry;
      }
  
      @PostConstruct
      public void init() {
          viewModelTypeForHomepage = causewayBeanTypeRegistry.findHomepageViewmodel();
      }
  
      @Override
      public Object getHomePage() {
          return viewModelTypeForHomepage
                  .map(ClassExtensions::newInstance)
                  .map(factoryService::viewModel)
                  .orElse(null);
      }
  
  }
  