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.actions.validate;
021    
022    import org.apache.isis.applib.events.ValidityEvent;
023    import org.apache.isis.core.metamodel.facetapi.Facet;
024    import org.apache.isis.core.metamodel.facetapi.FacetAbstract;
025    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
026    import org.apache.isis.core.metamodel.interactions.ActionInvocationContext;
027    import org.apache.isis.core.metamodel.interactions.ValidityContext;
028    
029    public abstract class ActionValidationFacetAbstract extends FacetAbstract implements ActionValidationFacet {
030    
031        public static Class<? extends Facet> type() {
032            return ActionValidationFacet.class;
033        }
034    
035        public ActionValidationFacetAbstract(final FacetHolder holder) {
036            super(type(), holder, false);
037        }
038    
039        @Override
040        public String invalidates(final ValidityContext<? extends ValidityEvent> context) {
041            if (!(context instanceof ActionInvocationContext)) {
042                return null;
043            }
044            final ActionInvocationContext actionInvocationContext = (ActionInvocationContext) context;
045            return invalidReason(actionInvocationContext.getTarget(), actionInvocationContext.getArgs());
046        }
047    }