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 java.util.List;
022import java.util.stream.Collectors;
023import java.util.stream.Stream;
024
025import org.apache.isis.core.metamodel.spec.ManagedObject;
026import org.apache.isis.core.metamodel.spec.ObjectSpecification;
027import org.apache.isis.viewer.restfulobjects.applib.JsonRepresentation;
028import org.apache.isis.viewer.restfulobjects.applib.Rel;
029import org.apache.isis.viewer.restfulobjects.applib.RepresentationType;
030import org.apache.isis.viewer.restfulobjects.rendering.IResourceContext;
031import org.apache.isis.viewer.restfulobjects.rendering.LinkFollowSpecs;
032import org.apache.isis.viewer.restfulobjects.rendering.ReprRendererAbstract;
033
034public class ListReprRenderer extends ReprRendererAbstract<ListReprRenderer, Stream<ManagedObject>> {
035
036    private ObjectAdapterLinkTo linkTo;
037    private List<ManagedObject> objectAdapters;
038    private ObjectSpecification elementType;
039    private ObjectSpecification returnType;
040    private Rel elementRel;
041
042    public ListReprRenderer(final IResourceContext resourceContext, final LinkFollowSpecs linkFollower, final JsonRepresentation representation) {
043        super(resourceContext, linkFollower, RepresentationType.LIST, representation);
044        usingLinkToBuilder(new DomainObjectLinkTo());
045    }
046
047    public ListReprRenderer usingLinkToBuilder(final ObjectAdapterLinkTo objectAdapterLinkToBuilder) {
048        this.linkTo = objectAdapterLinkToBuilder.usingUrlBase(resourceContext);
049        return this;
050    }
051
052    @Override
053    public ListReprRenderer with(final Stream<ManagedObject> objectAdapters) {
054        this.objectAdapters = objectAdapters!=null 
055                ? objectAdapters
056                        .filter(adapter->!adapter.getSpecification().isHidden())
057                        .collect(Collectors.toList())
058                        : null;
059                        return this;
060    }
061
062    public ListReprRenderer withElementRel(Rel elementRel) {
063        this.elementRel = elementRel;
064        return this;
065    }
066
067    public ListReprRenderer withReturnType(final ObjectSpecification returnType) {
068        this.returnType = returnType;
069        return this;
070    }
071
072    public ListReprRenderer withElementType(final ObjectSpecification elementType) {
073        this.elementType = elementType;
074        return this;
075    }
076
077    @Override
078    public JsonRepresentation render() {
079
080        if(representation == null) {
081            return null;
082        }
083
084        addValue();
085
086        addLinkToReturnType();
087        addLinkToElementType();
088
089        getExtensions();
090
091        return representation;
092    }
093
094    private void addValue() {
095        if (objectAdapters == null) {
096            return;
097        }
098
099        final JsonRepresentation values = JsonRepresentation.newArray();
100
101        objectAdapters
102        .forEach(adapter->{
103            final JsonRepresentation linkToObject = linkTo.with(adapter).builder(elementRel).build();
104            values.arrayAdd(linkToObject);
105
106            final LinkFollowSpecs linkFollower = getLinkFollowSpecs().follow("value");
107            if (linkFollower.matches(linkToObject)) {
108                final DomainObjectReprRenderer renderer = 
109                        new DomainObjectReprRenderer(
110                                getResourceContext(), 
111                                linkFollower, 
112                                JsonRepresentation.newMap());
113                final JsonRepresentation domainObject = renderer.with(adapter).render();
114                linkToObject.mapPut("value", domainObject);
115            }            
116        });
117
118        representation.mapPut("value", values);
119    }
120
121
122    protected void addLinkToReturnType() {
123        addLink(Rel.RETURN_TYPE, returnType);
124    }
125
126    protected void addLinkToElementType() {
127        addLink(Rel.ELEMENT_TYPE, elementType);
128    }
129
130}