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.fallback;
021
022import org.apache.isis.applib.events.UsabilityEvent;
023import org.apache.isis.core.metamodel.facetapi.FacetHolder;
024import org.apache.isis.core.metamodel.facets.object.notpersistable.NotPersistableFacet;
025import org.apache.isis.core.metamodel.facets.object.notpersistable.NotPersistableFacetAbstract;
026import org.apache.isis.core.metamodel.interactions.UsabilityContext;
027
028/**
029 * Installed by the {@link FallbackFacetFactory}, and means that this class
030 * <i>is</i> persistable (ie not {@link NotPersistableFacet not persistable}).
031 */
032public class NotPersistableFacetNull extends NotPersistableFacetAbstract {
033
034    public NotPersistableFacetNull(final FacetHolder holder) {
035        super(null, holder);
036    }
037
038    /**
039     * Always returns <tt>null</tt> (that is, does <i>not</i> disable).
040     */
041    @Override
042    public String disables(final UsabilityContext<? extends UsabilityEvent> ic) {
043        return null;
044    }
045
046}