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.collections.typeof;
021
022 import java.lang.reflect.ParameterizedType;
023 import java.lang.reflect.Type;
024 import java.lang.reflect.TypeVariable;
025
026 import org.apache.isis.applib.annotation.TypeOf;
027 import org.apache.isis.core.metamodel.facetapi.FacetUtil;
028 import org.apache.isis.core.metamodel.facetapi.FeatureType;
029 import org.apache.isis.core.metamodel.facets.AnnotationBasedFacetFactoryAbstract;
030 import org.apache.isis.core.metamodel.facets.typeof.TypeOfFacetInferredFromArray;
031 import org.apache.isis.core.metamodel.facets.typeof.TypeOfFacetInferredFromGenerics;
032 import org.apache.isis.core.metamodel.specloader.collectiontyperegistry.CollectionTypeRegistry;
033 import org.apache.isis.core.metamodel.specloader.collectiontyperegistry.CollectionTypeRegistryAware;
034
035 public class TypeOfAnnotationForCollectionsFacetFactory extends AnnotationBasedFacetFactoryAbstract implements
036 CollectionTypeRegistryAware {
037 private CollectionTypeRegistry collectionTypeRegistry;
038
039 public TypeOfAnnotationForCollectionsFacetFactory() {
040 super(FeatureType.COLLECTIONS_ONLY);
041 }
042
043 @Override
044 public void process(final ProcessMethodContext processMethodContext) {
045
046 final TypeOf annotation = getAnnotation(processMethodContext.getMethod(), TypeOf.class);
047
048 final Class<?> methodReturnType = processMethodContext.getMethod().getReturnType();
049 if (!collectionTypeRegistry.isCollectionType(methodReturnType)
050 && !collectionTypeRegistry.isArrayType(methodReturnType)) {
051 return;
052 }
053
054 final Class<?> returnType = processMethodContext.getMethod().getReturnType();
055 if (returnType.isArray()) {
056 final Class<?> componentType = returnType.getComponentType();
057 FacetUtil.addFacet(new TypeOfFacetInferredFromArray(componentType, processMethodContext.getFacetHolder(),
058 getSpecificationLookup()));
059 return;
060 }
061
062 if (annotation != null) {
063 FacetUtil.addFacet(new TypeOfFacetAnnotationForCollection(annotation.value(), processMethodContext
064 .getFacetHolder(), getSpecificationLookup()));
065 return;
066 }
067
068 final Type type = processMethodContext.getMethod().getGenericReturnType();
069 if (!(type instanceof ParameterizedType)) {
070 return;
071 }
072
073 final ParameterizedType parameterizedType = (ParameterizedType) type;
074 final Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
075 if (actualTypeArguments.length == 0) {
076 return;
077 }
078
079 final Object actualTypeArgument = actualTypeArguments[0];
080 if (actualTypeArgument instanceof Class) {
081 final Class<?> actualType = (Class<?>) actualTypeArgument;
082 FacetUtil.addFacet(new TypeOfFacetInferredFromGenerics(actualType, processMethodContext.getFacetHolder(),
083 getSpecificationLookup()));
084 return;
085 }
086
087 if (actualTypeArgument instanceof TypeVariable) {
088
089 // TODO: what to do here?
090 return;
091 }
092
093 }
094
095 @Override
096 public void setCollectionTypeRegistry(final CollectionTypeRegistry collectionTypeRegistry) {
097 this.collectionTypeRegistry = collectionTypeRegistry;
098 }
099
100 }