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.encodeable;
021    
022    import org.apache.isis.applib.adapters.EncoderDecoder;
023    import org.apache.isis.core.commons.config.IsisConfiguration;
024    import org.apache.isis.core.commons.lang.JavaClassUtils;
025    import org.apache.isis.core.commons.lang.StringUtils;
026    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
027    
028    public final class EncoderDecoderUtil {
029    
030        private EncoderDecoderUtil() {
031        }
032    
033        public static final String ENCODER_DECODER_NAME_KEY_PREFIX = "isis.reflector.java.facets.encoderDecoder.";
034        public static final String ENCODER_DECODER_NAME_KEY_SUFFIX = ".encoderDecoderName";
035    
036        static String encoderDecoderNameFromConfiguration(final Class<?> type, final IsisConfiguration configuration) {
037            final String key = ENCODER_DECODER_NAME_KEY_PREFIX + type.getCanonicalName() + ENCODER_DECODER_NAME_KEY_SUFFIX;
038            final String encoderDecoderName = configuration.getString(key);
039            return !StringUtils.isNullOrEmpty(encoderDecoderName) ? encoderDecoderName : null;
040        }
041    
042        public static Class<?> encoderDecoderOrNull(final Class<?> candidateClass, final String classCandidateName) {
043            final Class<?> type =
044                candidateClass != null ? JavaClassUtils.implementingClassOrNull(candidateClass.getName(),
045                    EncoderDecoder.class, FacetHolder.class) : null;
046            return type != null ? type : JavaClassUtils.implementingClassOrNull(classCandidateName, EncoderDecoder.class,
047                FacetHolder.class);
048        }
049    
050    }