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.restfulobjects.rendering.domainobjects;
  
  import java.util.List;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.viewer.restfulobjects.applib.JsonRepresentation;
  import org.apache.causeway.viewer.restfulobjects.applib.Rel;
  import org.apache.causeway.viewer.restfulobjects.applib.RepresentationType;
  import org.apache.causeway.viewer.restfulobjects.rendering.IResourceContext;
  import org.apache.causeway.viewer.restfulobjects.rendering.LinkFollowSpecs;
  import org.apache.causeway.viewer.restfulobjects.rendering.ReprRendererAbstract;
  
  public class ListReprRenderer
  extends ReprRendererAbstract<Stream<ManagedObject>> {
  
      private ObjectAdapterLinkTo linkTo;
      private List<ManagedObject> objectAdapters;
      private ObjectSpecification elementType;
      private ObjectSpecification returnType;
      private Rel elementRel;
  
      public ListReprRenderer(
              final IResourceContext resourceContext,
              final LinkFollowSpecs linkFollower,
              final JsonRepresentation representation) {
          super(resourceContext, linkFollower, RepresentationType.LIST, representation);
          usingLinkToBuilder(new DomainObjectLinkTo());
      }
  
      public ListReprRenderer usingLinkToBuilder(final ObjectAdapterLinkTo objectAdapterLinkToBuilder) {
          this.linkTo = objectAdapterLinkToBuilder.usingUrlBase(resourceContext);
          return this;
      }
  
      @Override
      public ListReprRenderer with(final Stream<ManagedObject> objectAdapters) {
          this.objectAdapters = objectAdapters!=null
                  ? objectAdapters
                          .filter(adapter->!adapter.objSpec().isHidden())
                          .collect(Collectors.toList())
                          : null;
                          return this;
      }
  
      public ListReprRenderer withElementRel(final Rel elementRel) {
          this.elementRel = elementRel;
          return this;
      }
  
      public ListReprRenderer withReturnType(final ObjectSpecification returnType) {
          this.returnType = returnType;
          return this;
      }
  
      public ListReprRenderer withElementType(final ObjectSpecification elementType) {
          this.elementType = elementType;
          return this;
      }
  
      @Override
      public JsonRepresentation render() {
  
          if(representation == null) {
              return null;
          }
  
          addValue();
  
          addLinkToReturnType();
          addLinkToElementType();
  
          getExtensions();
  
          return representation;
      }
  
      private void addValue() {
          if (objectAdapters == null) {
              return;
          }
  
          final JsonRepresentation values = JsonRepresentation.newArray();
  
          objectAdapters
          .forEach(adapter->{
              final JsonRepresentation linkToObject = linkTo.with(adapter).builder(elementRel).build();
              values.arrayAdd(linkToObject);
  
              final LinkFollowSpecs linkFollower = getLinkFollowSpecs().follow("value");
              if (linkFollower.matches(linkToObject)) {
                  final DomainObjectReprRenderer renderer =
                          new DomainObjectReprRenderer(
                                  getResourceContext(),
                                  linkFollower,
                                  JsonRepresentation.newMap());
                  final JsonRepresentation domainObject = renderer.with(adapter).render();
                  linkToObject.mapPutJsonRepresentation("value", domainObject);
              }
          });
  
          representation.mapPutJsonRepresentation("value", values);
      }
  
      protected void addLinkToReturnType() {
          addLink(Rel.RETURN_TYPE, returnType);
      }
  
      protected void addLinkToElementType() {
          addLink(Rel.ELEMENT_TYPE, elementType);
      }
  
  }
  