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.param.mandatory.annotation;
021
022import java.lang.annotation.Annotation;
023
024import org.apache.isis.applib.annotation.Optional;
025import org.apache.isis.core.metamodel.facetapi.FacetUtil;
026import org.apache.isis.core.metamodel.facetapi.FeatureType;
027import org.apache.isis.core.metamodel.facets.Annotations;
028import org.apache.isis.core.metamodel.facets.FacetFactoryAbstract;
029
030public class OptionalAnnotationForParameterFacetFactory extends FacetFactoryAbstract {
031
032    public OptionalAnnotationForParameterFacetFactory() {
033        super(FeatureType.PARAMETERS_ONLY);
034    }
035
036    @Override
037    public void processParams(final ProcessParameterContext processParameterContext) {
038        final Class<?>[] parameterTypes = processParameterContext.getMethod().getParameterTypes();
039        if (processParameterContext.getParamNum() >= parameterTypes.length) {
040            // ignore
041            return;
042        }
043        if (parameterTypes[processParameterContext.getParamNum()].isPrimitive()) {
044            return;
045        }
046        final Annotation[] parameterAnnotations = Annotations.getParameterAnnotations(processParameterContext.getMethod())[processParameterContext.getParamNum()];
047        for (final Annotation parameterAnnotation : parameterAnnotations) {
048            if (parameterAnnotation instanceof Optional) {
049                FacetUtil.addFacet(new MandatoryFacetInvertedByOptionalForParameter(processParameterContext.getFacetHolder()));
050                return;
051            }
052        }
053    }
054
055}