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.facets.object.navchild;
  
  import java.util.Map;
  
  import org.apache.causeway.applib.ViewModel;
  import org.apache.causeway.applib.annotation.CollectionLayout;
  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.commons.collections.Can;
  
  import lombok.Getter;
  import lombok.experimental.UtilityClass;
  
  @UtilityClass
  class _TreeSample {
  
      static interface SampleNode {
          String name();
      }
  
      record A(String name,
          @CollectionLayout(navigableSubtree = "1") Can<B> childrenB,
          @CollectionLayout(navigableSubtree = "2") Map<String, C> childrenC) implements SampleNode {
      }
      record B(String name,
          @PropertyLayout(navigableSubtree = "1") C childC,
          @CollectionLayout(navigableSubtree = "2") Can<D> childrenD) implements SampleNode {
      }
      record C(String name,
          @CollectionLayout(navigableSubtree = "1") Can<D> childrenD) implements SampleNode {
      }
      record D(String name) implements SampleNode {
      }
  
      A sampleA() {
          var ds = Can.of(new D("d1"), new D("d2"), new D("d3"));
          var cs = Can.of(new C("c1", ds), new C("c2", ds));
          var bs = Can.of(new B("b1", cs.getElseFail(0), ds), new B("b2", cs.getElseFail(1), ds));
          var a = new A("a", bs, cs.toMap(C::name));
          return a;
      }
  
      String nameOf(final Object node) {
          return node instanceof SampleNode sampleNode
              ? sampleNode.name()
              : "?";
      }
  
      public static class SampleNodeView implements ViewModel {
  
          @Programmatic
          final String memento;
  
          public SampleNodeView(final String memento) {
              this.memento = memento;
              this.name = "TODO";
          }
  
          @Override
          public String viewModelMemento() {
              return memento;
          }
  
          @Property @Getter
          final String name;
  
      }
  
  }
  