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