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.viewer.graphql.model.domain.simple.query;
  
  import graphql.schema.DataFetchingEnvironment;
  
  import static graphql.schema.GraphQLFieldDefinition.newFieldDefinition;
  
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.spec.feature.OneToManyAssociation;
  import org.apache.causeway.viewer.graphql.model.context.Context;
  import org.apache.causeway.viewer.graphql.model.domain.Element;
  import org.apache.causeway.viewer.graphql.model.domain.common.interactors.ObjectInteractor;
  import org.apache.causeway.viewer.graphql.model.fetcher.BookmarkedPojo;
  
  public class SimpleCollection
          extends Element {
  
      final ObjectInteractor objectInteractor;
      private final OneToManyAssociation objectMember;
  
      public SimpleCollection(
              final ObjectInteractor objectInteractor,
              final OneToManyAssociation otma,
              final Context context
      ) {
          super(context);
          this.objectInteractor = objectInteractor;
          this.objectMember = otma;
  
          var objectType = this.context.typeMapper.listTypeForElementTypeOf(otma, objectInteractor.getSchemaType());
          if(objectType != null) {
              setField(newFieldDefinition()
                          .name(getId())
                          .description(otma.getCanonicalDescription().orElse(otma.getCanonicalFriendlyName()))
                          .type(objectType)
                          .build()
              );
          } else {
              setField(null);
          }
      }
  
      public String getId() {
          return objectMember.asciiId();
      }
  
      @Override
      protected Object fetchData(final DataFetchingEnvironment environment) {
  
          var sourcePojo = BookmarkedPojo.sourceFrom(environment);
  
          var sourcePojoClass = sourcePojo.getClass();
          var objectSpecification = context.specificationLoader.loadSpecification(sourcePojoClass);
          if (objectSpecification == null) {
              // not expected
              return null;
          }
  
          var otma = objectMember;
          var managedObject = ManagedObject.adaptSingular(objectSpecification, sourcePojo);
          var resultManagedObject = otma.get(managedObject);
  
          return resultManagedObject != null
                  ? resultManagedObject.getPojo()
                  : null;
      }
  }
  