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.members.disabled.method;
021
022import java.lang.reflect.Method;
023import java.util.Collections;
024import java.util.List;
025
026import org.apache.isis.applib.events.UsabilityEvent;
027import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
028import org.apache.isis.core.metamodel.adapter.util.AdapterInvokeUtils;
029import org.apache.isis.core.metamodel.facetapi.FacetHolder;
030import org.apache.isis.core.metamodel.facets.ImperativeFacet;
031import org.apache.isis.core.metamodel.facets.ImperativeFacet.Intent;
032import org.apache.isis.core.metamodel.interactions.UsabilityContext;
033import org.apache.isis.core.progmodel.facets.members.disabled.DisableForContextFacetAbstract;
034
035public class DisableForContextFacetViaMethod extends DisableForContextFacetAbstract implements ImperativeFacet {
036
037    private final Method method;
038
039    public DisableForContextFacetViaMethod(final Method method, final FacetHolder holder) {
040        super(holder);
041        this.method = method;
042    }
043
044    /**
045     * Returns a singleton list of the {@link Method} provided in the
046     * constructor.
047     */
048    @Override
049    public List<Method> getMethods() {
050        return Collections.singletonList(method);
051    }
052
053    @Override
054    public Intent getIntent(final Method method) {
055        return Intent.CHECK_IF_DISABLED;
056    }
057
058    @Override
059    public boolean impliesResolve() {
060        return true;
061    }
062
063    @Override
064    public boolean impliesObjectChanged() {
065        return false;
066    }
067
068    /**
069     * The reason this object is disabled, or <tt>null</tt> otherwise.
070     */
071    @Override
072    public String disables(final UsabilityContext<? extends UsabilityEvent> ic) {
073        final ObjectAdapter target = ic.getTarget();
074        if (target == null) {
075            return null;
076        }
077        return (String) AdapterInvokeUtils.invoke(method, target, ic.getContributeeAsMap());
078    }
079
080    @Override
081    protected String toStringValues() {
082        return "method=" + method;
083    }
084
085}