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