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
020package org.apache.isis.core.progmodel.facets.object.publish;
021
022import org.apache.isis.applib.annotation.PublishedObject;
023import org.apache.isis.core.metamodel.facetapi.FacetHolder;
024import org.apache.isis.core.metamodel.facetapi.FacetUtil;
025import org.apache.isis.core.metamodel.facetapi.FeatureType;
026import org.apache.isis.core.metamodel.facets.Annotations;
027import org.apache.isis.core.metamodel.facets.FacetFactoryAbstract;
028import org.apache.isis.core.metamodel.facets.object.publish.PublishedObjectFacet;
029
030public class PublishedObjectAnnotationFacetFactory extends FacetFactoryAbstract {
031
032    public PublishedObjectAnnotationFacetFactory() {
033        super(FeatureType.OBJECTS_ONLY);
034    }
035
036    @Override
037    public void process(ProcessClassContext processClassContext) {
038        super.process(processClassContext);
039        final PublishedObject annotation = Annotations.getAnnotation(processClassContext.getCls(), PublishedObject.class);
040        FacetUtil.addFacet(create(annotation, processClassContext.getFacetHolder()));
041    }
042
043    private PublishedObjectFacet create(final PublishedObject annotation, final FacetHolder holder) {
044        return annotation == null ? null : new PublishedObjectFacetAnnotation(newPayloadFactory(annotation.value()), holder);
045    }
046
047    private static PublishedObject.PayloadFactory newPayloadFactory(final Class<? extends PublishedObject.PayloadFactory> value) {
048        if(value == null) {
049            return null;
050        }
051        try {
052            return (PublishedObject.PayloadFactory) value.newInstance();
053        } catch (final InstantiationException e) {
054            return null;
055        } catch (final IllegalAccessException e) {
056            return null;
057        }
058    }
059
060}