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.validate;
021
022import org.apache.isis.applib.events.ValidityEvent;
023import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
024import org.apache.isis.core.metamodel.facetapi.Facet;
025import org.apache.isis.core.metamodel.facetapi.FacetAbstract;
026import org.apache.isis.core.metamodel.facetapi.FacetHolder;
027import org.apache.isis.core.metamodel.facets.mandatory.MandatoryFacet;
028import org.apache.isis.core.metamodel.interactions.PropertyModifyContext;
029import org.apache.isis.core.metamodel.interactions.ValidityContext;
030
031public abstract class PropertyValidateFacetAbstract extends FacetAbstract implements PropertyValidateFacet {
032
033    public static Class<? extends Facet> type() {
034        return PropertyValidateFacet.class;
035    }
036
037    public PropertyValidateFacetAbstract(final FacetHolder holder) {
038        super(type(), holder, Derivation.NOT_DERIVED);
039    }
040
041    @Override
042    public String invalidates(final ValidityContext<? extends ValidityEvent> context) {
043        if (!(context instanceof PropertyModifyContext)) {
044            return null;
045        }
046        final PropertyModifyContext propertyModifyContext = (PropertyModifyContext) context;
047        ObjectAdapter proposed = propertyModifyContext.getProposed();
048        if(proposed == null) {
049            // skip validation if null value and optional property.
050            MandatoryFacet mandatoryFacet = getFacetHolder().getFacet(MandatoryFacet.class);
051            if(mandatoryFacet == null || mandatoryFacet.isNoop() || mandatoryFacet.isInvertedSemantics()) {
052                return null;
053            }
054        }
055        return invalidReason(propertyModifyContext.getTarget(), proposed);
056    }
057}