001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *
010     *        http://www.apache.org/licenses/LICENSE-2.0
011     *
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License.
018     */
019    
020    package org.apache.isis.core.progmodel.facets.properties.mandatory.annotation;
021    
022    import org.apache.isis.applib.annotation.Optional;
023    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
024    import org.apache.isis.core.metamodel.facetapi.FacetUtil;
025    import org.apache.isis.core.metamodel.facetapi.FeatureType;
026    import org.apache.isis.core.metamodel.facets.AnnotationBasedFacetFactoryAbstract;
027    import org.apache.isis.core.metamodel.facets.mandatory.MandatoryFacet;
028    
029    public class OptionalAnnotationForPropertyFacetFactory extends AnnotationBasedFacetFactoryAbstract {
030    
031        public OptionalAnnotationForPropertyFacetFactory() {
032            super(FeatureType.PROPERTIES_ONLY);
033        }
034    
035        @Override
036        public void process(final ProcessMethodContext processMethodContext) {
037            final Class<?> returnType = processMethodContext.getMethod().getReturnType();
038            if (returnType.isPrimitive()) {
039                return;
040            }
041            if (!isAnnotationPresent(processMethodContext.getMethod(), Optional.class)) {
042                return;
043            }
044            final Optional annotation = getAnnotation(processMethodContext.getMethod(), Optional.class);
045            FacetUtil.addFacet(create(annotation, processMethodContext.getFacetHolder()));
046        }
047    
048        private MandatoryFacet create(final Optional annotation, final FacetHolder holder) {
049            return annotation != null ? new MandatoryFacetInvertedByOptionalForProperty(holder) : null;
050        }
051    
052    }