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.object.choices.enums;
021    
022    import org.apache.isis.core.commons.lang.CastUtils;
023    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
024    import org.apache.isis.core.metamodel.facetapi.FacetUtil;
025    import org.apache.isis.core.metamodel.facets.choices.ChoicesFacet;
026    import org.apache.isis.core.progmodel.facets.object.value.ValueUsingValueSemanticsProviderFacetFactory;
027    
028    public class EnumFacetFactory<T extends Enum<T>> extends ValueUsingValueSemanticsProviderFacetFactory<T> {
029    
030        public EnumFacetFactory() {
031            super(ChoicesFacet.class);
032        }
033    
034        @Override
035        public void process(final ProcessClassContext processClassContext) {
036            final Class<?> cls = processClassContext.getCls();
037            final FacetHolder holder = processClassContext.getFacetHolder();
038    
039            if (!cls.isEnum()) {
040                return;
041            }
042    
043            addFacets(new EnumValueSemanticsProvider<T>(holder, asT(cls), getConfiguration(), getContext()));
044            FacetUtil.addFacet(new ChoicesFacetEnum(holder, cls.getEnumConstants()));
045        }
046    
047        protected Class<T> asT(final Class<?> cls) {
048            return CastUtils.cast(cls);
049        }
050    
051    }