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 */
019package org.apache.isis.viewer.restfulobjects.rendering.domainobjects;
020
021import javax.ws.rs.core.MediaType;
022
023import org.apache.isis.core.metamodel.facets.object.encodeable.EncodableFacet;
024import org.apache.isis.core.metamodel.spec.ManagedObject;
025import org.apache.isis.core.metamodel.spec.ObjectSpecification;
026import org.apache.isis.viewer.restfulobjects.applib.JsonRepresentation;
027import org.apache.isis.viewer.restfulobjects.applib.Rel;
028import org.apache.isis.viewer.restfulobjects.rendering.IResourceContext;
029import org.apache.isis.viewer.restfulobjects.rendering.LinkFollowSpecs;
030import org.apache.isis.viewer.restfulobjects.rendering.ReprRendererAbstract;
031import org.apache.isis.viewer.restfulobjects.rendering.ReprRendererException;
032
033public class ScalarValueReprRenderer extends ReprRendererAbstract<ScalarValueReprRenderer, ManagedObject> {
034
035    private ObjectSpecification returnType;
036
037    public ScalarValueReprRenderer(
038            final IResourceContext resourceContext,
039            final LinkFollowSpecs linkFollower,
040            final JsonRepresentation representation) {
041        super(resourceContext, linkFollower, null, representation); // null for representationType (there is none)
042    }
043
044    /**
045     * Fail early...
046     *
047     * <p>
048     * In case I forget in the future that scalar values don't have a representation.
049     */
050    @Override
051    public MediaType getMediaType() {
052        throw new UnsupportedOperationException("no mediaType defined for scalar values");
053    }
054
055    @Override
056    public ScalarValueReprRenderer with(final ManagedObject objectAdapter) {
057        final EncodableFacet facet = objectAdapter.getSpecification().getFacet(EncodableFacet.class);
058        if (facet == null) {
059            throw ReprRendererException.create("Not an (encodable) value", objectAdapter.titleString());
060        }
061        String format = null; // TODO
062        final Object value = jsonValueEncoder.asObject(objectAdapter, format);
063
064        representation.mapPut("value", value);
065        return this;
066    }
067
068    @Override
069    public JsonRepresentation render() {
070
071        addLinkToReturnType();
072
073        getExtensions();
074
075        return representation;
076    }
077
078    public ScalarValueReprRenderer withReturnType(final ObjectSpecification returnType) {
079        this.returnType = returnType;
080        return this;
081    }
082
083    private void addLinkToReturnType() {
084        addLink(Rel.RETURN_TYPE, returnType);
085    }
086
087}