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.members.hide.forsession;
021    
022    import java.lang.reflect.Method;
023    import java.util.Collections;
024    import java.util.List;
025    
026    import org.apache.isis.core.commons.authentication.AuthenticationSession;
027    import org.apache.isis.core.commons.authentication.AuthenticationSessionUtils;
028    import org.apache.isis.core.metamodel.adapter.util.InvokeUtils;
029    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
030    import org.apache.isis.core.metamodel.facets.ImperativeFacet;
031    import org.apache.isis.core.progmodel.facets.members.hide.HideForSessionFacetAbstract;
032    
033    public class HideForSessionFacetViaMethod extends HideForSessionFacetAbstract implements ImperativeFacet {
034    
035        private final Method method;
036    
037        public HideForSessionFacetViaMethod(final Method method, final FacetHolder holder) {
038            super(holder);
039            this.method = method;
040        }
041    
042        /**
043         * Returns a singleton list of the {@link Method} provided in the constructor.
044         */
045        @Override
046        public List<Method> getMethods() {
047            return Collections.singletonList(method);
048        }
049    
050        @Override
051        public boolean impliesResolve() {
052            return true;
053        }
054    
055        @Override
056        public boolean impliesObjectChanged() {
057            return false;
058        }
059    
060        /**
061         * Will only check provided that a {@link AuthenticationSession} has been provided.
062         */
063        @Override
064        public String hiddenReason(final AuthenticationSession session) {
065            if (session == null) {
066                return null;
067            }
068            final int len = method.getParameterTypes().length;
069            final Object[] parameters = new Object[len];
070            parameters[0] = AuthenticationSessionUtils.createUserMemento(session);
071            // TODO: need to change to pick up as non-static rather than static
072            final Boolean isHidden = (Boolean) InvokeUtils.invokeStatic(method, parameters);
073            return isHidden.booleanValue() ? "Hidden" : null;
074        }
075    
076        @Override
077        protected String toStringValues() {
078            return "method=" + method;
079        }
080    
081    }