1 /*
2 * Copyright 2015 Data Archiving and Networked Services (an institute of
3 * Koninklijke Nederlandse Akademie van Wetenschappen), King's College London,
4 * Georg-August-Universitaet Goettingen Stiftung Oeffentlichen Rechts
5 *
6 * Licensed under the EUPL, Version 1.1 or – as soon they will be approved by
7 * the European Commission - subsequent versions of the EUPL (the "Licence");
8 * You may not use this work except in compliance with the Licence.
9 * You may obtain a copy of the Licence at:
10 *
11 * https://joinup.ec.europa.eu/software/page/eupl
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the Licence is distributed on an "AS IS" basis,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the Licence for the specific language governing
17 * permissions and limitations under the Licence.
18 */
19
20 package eu.ehri.project.models.base;
21
22 import com.tinkerpop.blueprints.Direction;
23 import com.tinkerpop.blueprints.Vertex;
24 import com.tinkerpop.frames.Adjacency;
25 import com.tinkerpop.frames.modules.javahandler.JavaHandler;
26 import com.tinkerpop.frames.modules.javahandler.JavaHandlerContext;
27 import eu.ehri.project.definitions.Ontology;
28 import eu.ehri.project.models.events.Version;
29 import eu.ehri.project.models.utils.JavaHandlerUtils;
30
31 /**
32 * An entity that may have prior versions.
33 */
34 public interface Versioned extends Accessible {
35 /**
36 * Get the most recent version for this item, if one exists.
37 *
38 * @return a version frame, or null if there is no prior version
39 */
40 @Adjacency(label = Ontology.ENTITY_HAS_PRIOR_VERSION, direction = Direction.OUT)
41 Version getPriorVersion();
42
43 /**
44 * Loops through the chain of prior versions until the oldest existing version.
45 *
46 * @return an iterable of prior item versions
47 */
48 @JavaHandler
49 Iterable<Version> getAllPriorVersions();
50
51 abstract class Impl implements JavaHandlerContext<Vertex>, Versioned {
52
53 public Iterable<Version> getAllPriorVersions() {
54 return frameVertices(gremlin().as("n").out(Ontology.ENTITY_HAS_PRIOR_VERSION)
55 .loop("n", JavaHandlerUtils.noopLoopFunc, JavaHandlerUtils.noopLoopFunc));
56 }
57 }
58 }