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.defaults.method;
021
022 import java.lang.reflect.Method;
023 import java.util.Collections;
024 import java.util.List;
025
026 import org.apache.isis.core.commons.exceptions.UnknownTypeException;
027 import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
028 import org.apache.isis.core.metamodel.adapter.map.AdapterMap;
029 import org.apache.isis.core.metamodel.adapter.util.AdapterInvokeUtils;
030 import org.apache.isis.core.metamodel.facetapi.FacetHolder;
031 import org.apache.isis.core.metamodel.facets.ImperativeFacet;
032 import org.apache.isis.core.metamodel.spec.ObjectSpecification;
033 import org.apache.isis.core.metamodel.spec.SpecificationLookup;
034 import org.apache.isis.core.progmodel.facets.properties.defaults.PropertyDefaultFacetAbstract;
035
036 public class PropertyDefaultFacetViaMethod extends PropertyDefaultFacetAbstract implements ImperativeFacet {
037
038 private final Method method;
039 private final SpecificationLookup specificationLookup;
040 private final AdapterMap adapterMap;
041
042 public PropertyDefaultFacetViaMethod(final Method method, final FacetHolder holder,
043 final SpecificationLookup specificationLookup, final AdapterMap adapterManager) {
044 super(holder);
045 this.method = method;
046 this.specificationLookup = specificationLookup;
047 this.adapterMap = adapterManager;
048 }
049
050 /**
051 * Returns a singleton list of the {@link Method} provided in the constructor.
052 */
053 @Override
054 public List<Method> getMethods() {
055 return Collections.singletonList(method);
056 }
057
058 @Override
059 public boolean impliesResolve() {
060 return true;
061 }
062
063 @Override
064 public boolean impliesObjectChanged() {
065 return false;
066 }
067
068 @Override
069 public ObjectAdapter getDefault(final ObjectAdapter owningAdapter) {
070 final Object result = AdapterInvokeUtils.invoke(method, owningAdapter);
071 return createAdapter(method.getReturnType(), result);
072 }
073
074 private ObjectAdapter createAdapter(final Class<?> type, final Object object) {
075 final ObjectSpecification specification = getSpecificationLookup().loadSpecification(type);
076 if (specification.isNotCollection()) {
077 return getAdapterMap().adapterFor(object);
078 } else {
079 throw new UnknownTypeException("not an object, is this a collection?");
080 }
081 }
082
083 @Override
084 protected String toStringValues() {
085 return "method=" + method;
086 }
087
088 // //////////////////////////////////////////////////////////////////
089 // Dependencies (from constructor)
090 // //////////////////////////////////////////////////////////////////
091
092 private SpecificationLookup getSpecificationLookup() {
093 return specificationLookup;
094 }
095
096 protected AdapterMap getAdapterMap() {
097 return adapterMap;
098 }
099
100 }