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.projection;
  
  import java.util.Optional;
  
  import org.apache.causeway.applib.annotation.Projecting;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.properties.projection.ProjectingFacet;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  import org.apache.causeway.core.metamodel.spec.feature.MixedIn;
  import org.apache.causeway.core.metamodel.spec.feature.OneToOneAssociation;
  
  public class ProjectionFacetFromProjectingProperty
  extends ProjectionFacetAbstract {
  
      private final OneToOneAssociation projectingProperty;
  
      public static Optional<ProjectionFacet> create(final ObjectSpecification objectSpecification) {
          return objectSpecification.streamProperties(MixedIn.EXCLUDED)
          .filter(prop ->
              prop.lookupNonFallbackFacet(ProjectingFacet.class)
              .map(projectingFacet -> projectingFacet.value() == Projecting.PROJECTED)
              .orElse(false)
          )
          .findFirst()
          .map(prop -> new ProjectionFacetFromProjectingProperty(prop, objectSpecification));
      }
  
      private ProjectionFacetFromProjectingProperty(
              final OneToOneAssociation projectingProperty,
              final FacetHolder holder) {
  
          super(holder);
          this.projectingProperty = projectingProperty;
      }
  
      @Override
      public ManagedObject projected(final ManagedObject owningAdapter) {
          return projectingProperty.get(owningAdapter);
      }
  }
  