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.enums;
021
022import java.util.List;
023
024import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
025import org.apache.isis.core.metamodel.adapter.mgr.AdapterManager;
026import org.apache.isis.core.metamodel.facetapi.FacetHolder;
027import org.apache.isis.core.metamodel.facets.TypedHolder;
028import org.apache.isis.core.metamodel.facets.choices.ChoicesFacet;
029import org.apache.isis.core.metamodel.spec.ObjectSpecification;
030import org.apache.isis.core.metamodel.spec.SpecificationLoader;
031import org.apache.isis.core.progmodel.facets.param.choices.ActionParameterChoicesFacetAbstract;
032
033public class ActionParameterChoicesFacetDerivedFromChoicesFacet extends ActionParameterChoicesFacetAbstract {
034
035    public ActionParameterChoicesFacetDerivedFromChoicesFacet(final FacetHolder holder, final SpecificationLoader specificationLookup, final AdapterManager adapterManager) {
036        super(holder, specificationLookup, adapterManager);
037    }
038
039    @Override
040    public Object[] getChoices(final ObjectAdapter adapter, final List<ObjectAdapter> arguments) {
041        final FacetHolder facetHolder = getFacetHolder();
042        final TypedHolder paramPeer = (TypedHolder) facetHolder;
043        final ObjectSpecification noSpec = getSpecification(paramPeer.getType());
044        final ChoicesFacet choicesFacet = noSpec.getFacet(ChoicesFacet.class);
045        if (choicesFacet == null) {
046            return new Object[0];
047        }
048        return choicesFacet.getChoices(adapter);
049    }
050
051}