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.metamodel.spec.impl;
  
  import java.util.List;
  import java.util.stream.Stream;
  
  import org.apache.causeway.applib.exceptions.unrecoverable.UnknownTypeException;
  import org.apache.causeway.commons.internal.collections._Lists;
  import org.apache.causeway.core.metamodel.layout.DeweyOrderSet;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectAction;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectAssociation;
  import org.apache.causeway.core.metamodel.spec.feature.OneToManyAssociation;
  import org.apache.causeway.core.metamodel.spec.feature.OneToOneAssociation;
  
  /** package private utility */
  final class _MemberSortingUtils {
  
      // -- ASSOCIATION SORTING
  
      static List<ObjectAssociation> sortAssociationsIntoList(final Stream<ObjectAssociation> associations) {
          var deweyOrderSet = DeweyOrderSet.createOrderSet(associations);
          var orderedAssociations = _Lists.<ObjectAssociation> newArrayList();
          sortAssociations(deweyOrderSet, orderedAssociations);
          return orderedAssociations;
      }
  
      // -- ACTION SORTING
  
      static List<ObjectAction> sortActionsIntoList(final Stream<ObjectAction> actions) {
          var deweyOrderSet = DeweyOrderSet.createOrderSet(actions);
          var orderedActions = _Lists.<ObjectAction>newArrayList();
          sortActions(deweyOrderSet, orderedActions);
          return orderedActions;
      }
  
      // -- HELPER
  
      private static void sortAssociations(final DeweyOrderSet orderSet, final List<ObjectAssociation> associationsToAppendTo) {
          for (final Object element : orderSet) {
              if (element instanceof OneToManyAssociation) {
                  associationsToAppendTo.add((ObjectAssociation) element);
              } else if (element instanceof OneToOneAssociation) {
                  associationsToAppendTo.add((ObjectAssociation) element);
              } else if (element instanceof DeweyOrderSet) {
                  // just flatten.
                  DeweyOrderSet childOrderSet = (DeweyOrderSet) element;
                  sortAssociations(childOrderSet, associationsToAppendTo);
              } else {
                  throw new UnknownTypeException(element);
              }
          }
      }
  
      private static void sortActions(final DeweyOrderSet orderSet, final List<ObjectAction> actionsToAppendTo) {
          for (var element : orderSet) {
              if(element instanceof ObjectAction) {
                  var objectAction = (ObjectAction) element;
                  actionsToAppendTo.add(objectAction);
              }
              else if (element instanceof DeweyOrderSet) {
                  var deweyOrderSet = ((DeweyOrderSet) element);
                  var actions = _Lists.<ObjectAction>newArrayList();
                  sortActions(deweyOrderSet, actions);
                  actionsToAppendTo.addAll(actions);
              } else {
                  throw new UnknownTypeException(element);
              }
          }
      }
  
  }
  