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.properties.validate.perspec;
021
022import java.lang.reflect.Method;
023import java.util.ArrayList;
024import java.util.List;
025
026import org.apache.isis.applib.annotation.MustSatisfy;
027import org.apache.isis.applib.spec.Specification;
028import org.apache.isis.core.metamodel.facetapi.Facet;
029import org.apache.isis.core.metamodel.facetapi.FacetHolder;
030import org.apache.isis.core.metamodel.facetapi.FacetUtil;
031import org.apache.isis.core.metamodel.facetapi.FeatureType;
032import org.apache.isis.core.metamodel.facets.Annotations;
033import org.apache.isis.core.metamodel.facets.FacetFactoryAbstract;
034
035public class MustSatisfySpecificationOnPropertyFacetFactory extends FacetFactoryAbstract {
036
037    public MustSatisfySpecificationOnPropertyFacetFactory() {
038        super(FeatureType.PROPERTIES_ONLY);
039    }
040
041    @Override
042    public void process(final ProcessMethodContext processMethodContext) {
043        FacetUtil.addFacet(create(processMethodContext.getMethod(), processMethodContext.getFacetHolder()));
044    }
045
046    private Facet create(final Method method, final FacetHolder holder) {
047        return create(Annotations.getAnnotation(method, MustSatisfy.class), holder);
048    }
049
050    private Facet create(final MustSatisfy annotation, final FacetHolder holder) {
051        if (annotation == null) {
052            return null;
053        }
054        final Class<?>[] values = annotation.value();
055        final List<Specification> specifications = new ArrayList<Specification>();
056        for (final Class<?> value : values) {
057            final Specification specification = newSpecificationElseNull(value);
058            if (specification != null) {
059                specifications.add(specification);
060            }
061        }
062        return specifications.size() > 0 ? new MustSatisfySpecificationOnPropertyFacet(specifications, holder) : null;
063    }
064
065    private static Specification newSpecificationElseNull(final Class<?> value) {
066        if (!(Specification.class.isAssignableFrom(value))) {
067            return null;
068        }
069        try {
070            return (Specification) value.newInstance();
071        } catch (final InstantiationException e) {
072            return null;
073        } catch (final IllegalAccessException e) {
074            return null;
075        }
076    }
077
078}