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.choices.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.lang.ArrayUtil;
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.CollectionUtils;
035 import org.apache.isis.core.progmodel.facets.properties.choices.PropertyChoicesFacetAbstract;
036
037 public class PropertyChoicesFacetViaMethod extends PropertyChoicesFacetAbstract implements ImperativeFacet {
038
039 private final Method method;
040 private final Class<?> choicesClass;
041
042 private final AdapterMap adapterMap;
043
044 public PropertyChoicesFacetViaMethod(final Method method, final Class<?> choicesClass, final FacetHolder holder,
045 final SpecificationLookup specificationLookup, final AdapterMap adapterManager) {
046 super(holder, specificationLookup);
047 this.method = method;
048 this.choicesClass = choicesClass;
049 this.adapterMap = adapterManager;
050 }
051
052 /**
053 * Returns a singleton list of the {@link Method} provided in the constructor.
054 */
055 @Override
056 public List<Method> getMethods() {
057 return Collections.singletonList(method);
058 }
059
060 @Override
061 public boolean impliesResolve() {
062 return true;
063 }
064
065 @Override
066 public boolean impliesObjectChanged() {
067 return false;
068 }
069
070 @Override
071 public Object[] getChoices(final ObjectAdapter owningAdapter, final SpecificationLookup specificationLookup) {
072 final Object options = AdapterInvokeUtils.invoke(method, owningAdapter);
073 if (options == null) {
074 return null;
075 }
076 if (options.getClass().isArray()) {
077 return ArrayUtil.getObjectAsObjectArray(options);
078 }
079 final ObjectSpecification specification = specificationLookup.loadSpecification(choicesClass);
080 return CollectionUtils.getCollectionAsObjectArray(options, specification, getAdapterMap());
081 }
082
083 @Override
084 protected String toStringValues() {
085 return "method=" + method + ",class=" + choicesClass;
086 }
087
088 // ////////////////////////////////////////////
089 // Dependencies
090 // ////////////////////////////////////////////
091
092 protected AdapterMap getAdapterMap() {
093 return adapterMap;
094 }
095
096 }