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.properties.typicallen.annotation;
021
022import java.util.Properties;
023
024import org.apache.isis.applib.annotation.TypicalLength;
025import org.apache.isis.core.metamodel.facetapi.FacetHolder;
026import org.apache.isis.core.metamodel.facetapi.FacetUtil;
027import org.apache.isis.core.metamodel.facetapi.FeatureType;
028import org.apache.isis.core.metamodel.facets.Annotations;
029import org.apache.isis.core.metamodel.facets.ContributeeMemberFacetFactory;
030import org.apache.isis.core.metamodel.facets.FacetFactoryAbstract;
031import org.apache.isis.core.metamodel.facets.typicallen.TypicalLengthFacet;
032
033public class TypicalLengthOnPropertyFacetFactory extends FacetFactoryAbstract implements ContributeeMemberFacetFactory {
034
035    public TypicalLengthOnPropertyFacetFactory() {
036        super(FeatureType.PROPERTIES_ONLY);
037    }
038
039    @Override
040    public void process(final ProcessMethodContext processMethodContext) {
041        TypicalLengthFacet facet = createFromMetadataPropertiesIfPossible(processMethodContext);
042        if(facet == null) {
043            facet = createFromAnnotationIfPossible(processMethodContext);
044        }
045
046        // no-op if null
047        FacetUtil.addFacet(facet);
048    }
049
050    @Override
051    public void process(ProcessContributeeMemberContext processMemberContext) {
052        TypicalLengthFacet facet = createFromMetadataPropertiesIfPossible(processMemberContext);
053
054        // no-op if null
055        FacetUtil.addFacet(facet);
056    }
057
058    private static TypicalLengthFacet createFromMetadataPropertiesIfPossible(
059            final ProcessContextWithMetadataProperties<? extends FacetHolder> pcwmp) {
060        
061        final FacetHolder holder = pcwmp.getFacetHolder();
062        
063        final Properties properties = pcwmp.metadataProperties("typicalLength");
064        return properties != null ? new TypicalLengthFacetOnPropertyFromProperties(properties, holder) : null;
065    }
066
067    private static TypicalLengthFacet createFromAnnotationIfPossible(final ProcessMethodContext processMethodContext) {
068        final TypicalLength annotation = 
069                Annotations.getAnnotation(processMethodContext.getMethod(), TypicalLength.class);
070        return annotation != null 
071                ? new TypicalLengthFacetOnPropertyAnnotation(annotation.value(), processMethodContext.getFacetHolder()) 
072                : null;
073    }
074
075    
076}