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.param.typicallen.annotation;
021
022import java.lang.annotation.Annotation;
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.FacetFactoryAbstract;
030import org.apache.isis.core.metamodel.facets.typicallen.TypicalLengthFacet;
031
032public class TypicalLengthAnnotationOnParameterFacetFactory extends FacetFactoryAbstract {
033
034    public TypicalLengthAnnotationOnParameterFacetFactory() {
035        super(FeatureType.PARAMETERS_ONLY);
036    }
037
038    @Override
039    public void processParams(final ProcessParameterContext processParameterContext) {
040        final Annotation[] parameterAnnotations = Annotations.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}