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.typicallen.annotation;
021    
022    import java.lang.annotation.Annotation;
023    
024    import org.apache.isis.applib.annotation.TypicalLength;
025    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
026    import org.apache.isis.core.metamodel.facetapi.FacetUtil;
027    import org.apache.isis.core.metamodel.facetapi.FeatureType;
028    import org.apache.isis.core.metamodel.facets.AnnotationBasedFacetFactoryAbstract;
029    import org.apache.isis.core.metamodel.facets.typicallen.TypicalLengthFacet;
030    
031    public class TypicalLengthAnnotationOnParameterFacetFactory extends AnnotationBasedFacetFactoryAbstract {
032    
033        public TypicalLengthAnnotationOnParameterFacetFactory() {
034            super(FeatureType.PARAMETERS_ONLY);
035        }
036    
037        @Override
038        public void processParams(final ProcessParameterContext processParameterContext) {
039            final Annotation[] parameterAnnotations =
040                getParameterAnnotations(processParameterContext.getMethod())[processParameterContext.getParamNum()];
041            for (final Annotation parameterAnnotation : parameterAnnotations) {
042                if (parameterAnnotation instanceof TypicalLength) {
043                    final TypicalLength annotation = (TypicalLength) parameterAnnotation;
044                    FacetUtil.addFacet(create(annotation, processParameterContext.getFacetHolder()));
045                    return;
046                }
047            }
048        }
049    
050        private TypicalLengthFacet create(final TypicalLength annotation, final FacetHolder holder) {
051            return annotation != null ? new TypicalLengthFacetAnnotationOnParameter(annotation.value(), holder) : null;
052        }
053    
054    }