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.object.validperspec;
021    
022    import java.util.List;
023    
024    import org.apache.isis.applib.events.ValidityEvent;
025    import org.apache.isis.applib.spec.Specification;
026    import org.apache.isis.applib.util.ReasonBuffer;
027    import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
028    import org.apache.isis.core.metamodel.facetapi.Facet;
029    import org.apache.isis.core.metamodel.facetapi.FacetAbstract;
030    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
031    import org.apache.isis.core.metamodel.interactions.ProposedHolder;
032    import org.apache.isis.core.metamodel.interactions.ValidatingInteractionAdvisor;
033    import org.apache.isis.core.metamodel.interactions.ValidityContext;
034    
035    public class MustSatisfySpecificationOnTypeFacet extends FacetAbstract implements ValidatingInteractionAdvisor {
036    
037        public static Class<? extends Facet> type() {
038            return MustSatisfySpecificationOnTypeFacet.class;
039        }
040    
041        private final List<Specification> specifications;
042    
043        public MustSatisfySpecificationOnTypeFacet(final List<Specification> specifications, final FacetHolder holder) {
044            super(type(), holder, false);
045            this.specifications = specifications;
046        }
047    
048        @Override
049        public String invalidates(final ValidityContext<? extends ValidityEvent> validityContext) {
050            if (!(validityContext instanceof ProposedHolder)) {
051                return null;
052            }
053            final ProposedHolder proposedHolder = (ProposedHolder) validityContext;
054            final ObjectAdapter targetNO = proposedHolder.getProposed();
055            final Object targetObject = targetNO.getObject();
056            final ReasonBuffer buf = new ReasonBuffer();
057            for (final Specification specification : specifications) {
058                buf.append(specification.satisfies(targetObject));
059            }
060            return buf.getReason();
061        }
062    
063    }