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.object.value.annotation;
021
022import com.google.common.base.Strings;
023
024import org.apache.isis.applib.annotation.Value;
025import org.apache.isis.core.commons.config.IsisConfiguration;
026import org.apache.isis.core.commons.lang.StringExtensions;
027import org.apache.isis.core.metamodel.facetapi.FacetHolder;
028import org.apache.isis.core.progmodel.facets.object.value.ValueFacetAbstract;
029import org.apache.isis.core.progmodel.facets.object.value.ValueSemanticsProviderContext;
030import org.apache.isis.core.progmodel.facets.object.value.ValueSemanticsProviderUtil;
031
032public class ValueFacetAnnotation extends ValueFacetAbstract {
033
034    private static String semanticsProviderName(final Class<?> annotatedClass, final IsisConfiguration configuration) {
035        final Value annotation = annotatedClass.getAnnotation(Value.class);
036        final String semanticsProviderName = annotation.semanticsProviderName();
037        if (!Strings.isNullOrEmpty(semanticsProviderName)) {
038            return semanticsProviderName;
039        }
040        return ValueSemanticsProviderUtil.semanticsProviderNameFromConfiguration(annotatedClass, configuration);
041    }
042
043    private static Class<?> semanticsProviderClass(final Class<?> annotatedClass) {
044        final Value annotation = annotatedClass.getAnnotation(Value.class);
045        return annotation.semanticsProviderClass();
046    }
047
048    public ValueFacetAnnotation(final Class<?> annotatedClass, final FacetHolder holder, final IsisConfiguration configuration, final ValueSemanticsProviderContext context) {
049        this(semanticsProviderName(annotatedClass, configuration), semanticsProviderClass(annotatedClass), holder, configuration, context);
050    }
051
052    private ValueFacetAnnotation(final String candidateSemanticsProviderName, final Class<?> candidateSemanticsProviderClass, final FacetHolder holder, final IsisConfiguration configuration, final ValueSemanticsProviderContext context) {
053        super(ValueSemanticsProviderUtil.valueSemanticsProviderOrNull(candidateSemanticsProviderClass, candidateSemanticsProviderName), AddFacetsIfInvalidStrategy.DO_ADD, holder, configuration, context);
054    }
055
056    /**
057     * Always valid, even if the specified semanticsProviderName might have been
058     * wrong.
059     */
060    @Override
061    public boolean isValid() {
062        return true;
063    }
064
065}