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.title;
021    
022    import java.lang.reflect.Method;
023    import java.util.Collections;
024    import java.util.List;
025    
026    import org.apache.isis.applib.profiles.Localization;
027    import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
028    import org.apache.isis.core.metamodel.adapter.util.AdapterInvokeUtils;
029    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
030    import org.apache.isis.core.metamodel.facets.ImperativeFacet;
031    import org.apache.isis.core.metamodel.facets.object.title.TitleFacetAbstract;
032    import org.apache.log4j.Logger;
033    
034    public class TitleFacetViaTitleMethod extends TitleFacetAbstract implements ImperativeFacet {
035    
036        private static final Logger LOG = Logger.getLogger(TitleFacetViaTitleMethod.class);
037        private final Method method;
038    
039        public TitleFacetViaTitleMethod(final Method method, final FacetHolder holder) {
040            super(holder);
041            this.method = method;
042        }
043    
044        /**
045         * Returns a singleton list of the {@link Method} provided in the constructor.
046         */
047        @Override
048        public List<Method> getMethods() {
049            return Collections.singletonList(method);
050        }
051    
052        @Override
053        public boolean impliesResolve() {
054            return true;
055        }
056    
057        @Override
058        public boolean impliesObjectChanged() {
059            return false;
060        }
061    
062        @Override
063        public String title(final ObjectAdapter owningAdapter, final Localization localization) {
064            try {
065                return (String) AdapterInvokeUtils.invoke(method, owningAdapter);
066            } catch (final RuntimeException ex) {
067                LOG.warn("title failure", ex);
068                return "Failed Title";
069            }
070        }
071    
072    }