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
020package org.apache.isis.core.progmodel.facets.param.choices.method;
021
022import java.lang.reflect.Method;
023import java.util.Collections;
024import java.util.List;
025
026import org.apache.isis.core.commons.lang.ObjectExtensions;
027import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
028import org.apache.isis.core.metamodel.adapter.mgr.AdapterManager;
029import org.apache.isis.core.metamodel.adapter.util.AdapterInvokeUtils;
030import org.apache.isis.core.metamodel.facetapi.FacetHolder;
031import org.apache.isis.core.metamodel.facets.ImperativeFacet;
032import org.apache.isis.core.metamodel.facets.actions.choices.ActionChoicesFacetAbstract;
033import org.apache.isis.core.metamodel.spec.DomainModelException;
034import org.apache.isis.core.metamodel.spec.ObjectSpecification;
035import org.apache.isis.core.metamodel.spec.SpecificationLoader;
036import org.apache.isis.core.progmodel.facets.CollectionUtils;
037
038public class ActionChoicesFacetViaMethod extends ActionChoicesFacetAbstract implements ImperativeFacet {
039
040    private final Method method;
041    private final Class<?> choicesType;
042    private final SpecificationLoader specificationLookup;
043    private final AdapterManager adapterMap;
044
045    public ActionChoicesFacetViaMethod(final Method method, final Class<?> choicesType, final FacetHolder holder, final SpecificationLoader specificationLookup, final AdapterManager adapterManager) {
046        super(holder);
047        this.method = method;
048        this.choicesType = choicesType;
049        this.specificationLookup = specificationLookup;
050        this.adapterMap = adapterManager;
051    }
052
053    /**
054     * Returns a singleton list of the {@link Method} provided in the
055     * constructor.
056     */
057    @Override
058    public List<Method> getMethods() {
059        return Collections.singletonList(method);
060    }
061
062    @Override
063    public Intent getIntent(final Method method) {
064        return Intent.CHOICES_OR_AUTOCOMPLETE;
065    }
066
067    @Override
068    public boolean impliesResolve() {
069        return true;
070    }
071
072    @Override
073    public boolean impliesObjectChanged() {
074        return false;
075    }
076
077    @Override
078    public Object[][] getChoices(final ObjectAdapter owningAdapter) {
079        final Object invoke = AdapterInvokeUtils.invoke(method, owningAdapter);
080        if (!(invoke instanceof Object[])) {
081            throw new DomainModelException("Expected an array of collections (Object[]) containing choices for all parameters, but got " + invoke + " instead. Perhaps the parameter number is missing!");
082        }
083        final Object[] options = (Object[]) invoke;
084        final Object[][] results = new Object[options.length][];
085        for (int i = 0; i < results.length; i++) {
086            if (options[i] == null) {
087                results[i] = null;
088            } else if (options[i].getClass().isArray()) {
089                results[i] = ObjectExtensions.asArray(options[i]);
090            } else {
091                final ObjectSpecification specification = getSpecificationLookup().loadSpecification(choicesType);
092                results[i] = CollectionUtils.getCollectionAsObjectArray(options[i], specification, getAdapterMap());
093            }
094        }
095        return results;
096    }
097
098    @Override
099    protected String toStringValues() {
100        return "method=" + method + ",type=" + choicesType;
101    }
102
103    // ///////////////////////////////////////////////////////
104    // Dependencies
105    // ///////////////////////////////////////////////////////
106
107    private SpecificationLoader getSpecificationLookup() {
108        return specificationLookup;
109    }
110
111    private AdapterManager getAdapterMap() {
112        return adapterMap;
113    }
114
115}