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.metamodel.facets;
021
022import org.apache.isis.core.metamodel.facetapi.Facet;
023import org.apache.isis.core.metamodel.facetapi.FacetAbstract;
024import org.apache.isis.core.metamodel.facetapi.FacetHolder;
025import org.apache.isis.core.metamodel.spec.ObjectSpecification;
026import org.apache.isis.core.metamodel.spec.SpecificationLoader;
027
028public abstract class SingleClassValueFacetAbstract extends FacetAbstract implements SingleClassValueFacet {
029
030    private final Class<?> value;
031    private final SpecificationLoader specificationLookup;
032
033    public SingleClassValueFacetAbstract(final Class<? extends Facet> facetType, final FacetHolder holder, final Class<?> value, final SpecificationLoader specificationLookup) {
034        super(facetType, holder, Derivation.NOT_DERIVED);
035        this.value = value;
036        this.specificationLookup = specificationLookup;
037    }
038
039    @Override
040    public Class<?> value() {
041        return value;
042    }
043
044    /**
045     * The {@link ObjectSpecification} of the {@link #value()}.
046     */
047    @Override
048    public ObjectSpecification valueSpec() {
049        final Class<?> valueType = value();
050        return valueType != null ? getSpecificationLookup().loadSpecification(valueType) : null;
051    }
052
053    private SpecificationLoader getSpecificationLookup() {
054        return specificationLookup;
055    }
056
057}