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.param.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.facets.actions.choices.ActionChoicesFacetAbstract;
033 import org.apache.isis.core.metamodel.spec.DomainModelException;
034 import org.apache.isis.core.metamodel.spec.ObjectSpecification;
035 import org.apache.isis.core.metamodel.spec.SpecificationLookup;
036 import org.apache.isis.core.progmodel.facets.CollectionUtils;
037
038 public class ActionChoicesFacetViaMethod extends ActionChoicesFacetAbstract implements ImperativeFacet {
039
040 private final Method method;
041 private final Class<?> choicesType;
042 private final SpecificationLookup specificationLookup;
043 private final AdapterMap adapterMap;
044
045 public ActionChoicesFacetViaMethod(final Method method, final Class<?> choicesType, final FacetHolder holder,
046 final SpecificationLookup specificationLookup, final AdapterMap adapterManager) {
047 super(holder);
048 this.method = method;
049 this.choicesType = choicesType;
050 this.specificationLookup = specificationLookup;
051 this.adapterMap = adapterManager;
052 }
053
054 /**
055 * Returns a singleton list of the {@link Method} provided in the constructor.
056 */
057 @Override
058 public List<Method> getMethods() {
059 return Collections.singletonList(method);
060 }
061
062 @Override
063 public boolean impliesResolve() {
064 return true;
065 }
066
067 @Override
068 public boolean impliesObjectChanged() {
069 return false;
070 }
071
072 @Override
073 public Object[][] getChoices(final ObjectAdapter owningAdapter) {
074 final Object invoke = AdapterInvokeUtils.invoke(method, owningAdapter);
075 if (!(invoke instanceof Object[])) {
076 throw new DomainModelException(
077 "Expected an array of collections (Object[]) containing choices for all parameters, but got " + invoke
078 + " instead. Perhaps the parameter number is missing!");
079 }
080 final Object[] options = (Object[]) invoke;
081 final Object[][] results = new Object[options.length][];
082 for (int i = 0; i < results.length; i++) {
083 if (options[i] == null) {
084 results[i] = null;
085 } else if (options[i].getClass().isArray()) {
086 results[i] = ArrayUtil.getObjectAsObjectArray(options[i]);
087 } else {
088 final ObjectSpecification specification = getSpecificationLookup().loadSpecification(choicesType);
089 results[i] = CollectionUtils.getCollectionAsObjectArray(options[i], specification, getAdapterMap());
090 }
091 }
092 return results;
093 }
094
095 @Override
096 protected String toStringValues() {
097 return "method=" + method + ",type=" + choicesType;
098 }
099
100 // ///////////////////////////////////////////////////////
101 // Dependencies
102 // ///////////////////////////////////////////////////////
103
104 private SpecificationLookup getSpecificationLookup() {
105 return specificationLookup;
106 }
107
108 private AdapterMap getAdapterMap() {
109 return adapterMap;
110 }
111
112 }