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.methodnum;
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.param.choices.ActionParameterChoicesFacetAbstract;
036
037 public class ActionParameterChoicesFacetViaMethod extends ActionParameterChoicesFacetAbstract implements
038 ImperativeFacet {
039
040 private final Method method;
041 private final Class<?> choicesType;
042
043 public ActionParameterChoicesFacetViaMethod(final Method method, final Class<?> choicesType,
044 final FacetHolder holder, final SpecificationLookup specificationLookup, final AdapterMap adapterManager) {
045 super(holder, specificationLookup, adapterManager);
046 this.method = method;
047 this.choicesType = choicesType;
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 Object[] getChoices(final ObjectAdapter owningAdapter) {
070 final Object options = AdapterInvokeUtils.invoke(method, owningAdapter);
071 if (options == null) {
072 return new Object[0];
073 }
074 if (options.getClass().isArray()) {
075 return ArrayUtil.getObjectAsObjectArray(options);
076 } else {
077 final ObjectSpecification specification = getSpecification(choicesType);
078 return CollectionUtils.getCollectionAsObjectArray(options, specification, getAdapterMap());
079 }
080 }
081
082 @Override
083 protected String toStringValues() {
084 return "method=" + method + ",type=" + choicesType;
085 }
086
087 }