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.tabular.applib;
  
  import java.util.stream.Stream;
  
  import jakarta.inject.Inject;
  
  import org.apache.causeway.core.config.beans.CausewayBeanTypeRegistry;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.specloader.SpecificationLoader;
  import org.apache.causeway.core.metamodel.tabular.simple.DataTable;
  
  /**
   * TODO Early draft (wip) - could also easily move to MetamodelService
   */
  public abstract class DataTableProvider {
  
      @Inject SpecificationLoader specLoader;
      @Inject CausewayBeanTypeRegistry beanTypeRegistry;
  
      /**
       * Returns an empty {@link DataTable} for given domain object type
       * with columns mapped to non-mixed-in properties that are enabled for snapshots.
       * <p>
       * The table can be populated later on using {@link DataTable#setDataElements(Iterable)} or
       * {@link DataTable#setDataElementPojos(Iterable)}.
       */
      public DataTable getDataTable(final Class<?> domainType) {
          return DataTable.forDomainType(domainType,
                  DataTable.columnFilterExcludingMixins()
                  .and(DataTable.columnFilterIncludingEnabledForSnapshot()));
      }
  
      public Stream<DataTable> streamDataTables() {
          return streamEntityClasses()
              .map(this::getDataTable);
      }
  
      public Stream<ObjectSpecification> streamEntities() {
          return streamEntityClasses()
                  .map(specLoader::specForTypeElseFail);
      }
  
      public Stream<Class<?>> streamEntityClasses() {
          return beanTypeRegistry.streamEntityTypes(beanTypeRegistry.persistenceStack())
              //TODO perhaps externalize sorting
              .sorted((a, b)->a.getSimpleName().compareTo(b.getSimpleName()));
      }
  
  }
  