2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
21 package org.onap.aai.serialization.queryformats;
23 import com.google.gson.JsonArray;
24 import com.google.gson.JsonElement;
25 import com.google.gson.JsonObject;
26 import com.google.gson.JsonParser;
28 import java.io.ByteArrayOutputStream;
29 import java.io.IOException;
30 import java.io.OutputStream;
31 import java.util.Iterator;
32 import java.util.List;
34 import java.util.Optional;
36 import org.apache.tinkerpop.gremlin.structure.Direction;
37 import org.apache.tinkerpop.gremlin.structure.Vertex;
38 import org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONMapper;
39 import org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONVersion;
40 import org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONWriter;
41 import org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry;
42 import org.onap.aai.serialization.queryformats.exceptions.AAIFormatQueryResultFormatNotSupported;
43 import org.onap.aai.serialization.queryformats.exceptions.AAIFormatVertexException;
44 import org.slf4j.Logger;
45 import org.slf4j.LoggerFactory;
47 public class GraphSON implements FormatMapper {
49 private static final Logger logger = LoggerFactory.getLogger(GraphSON.class);
51 // TODO: Use v2 or v3 here
52 // v2 is the default starting from Janusgraph 0.3.0
53 // Further reference: https://tinkerpop.apache.org/docs/3.3.0/dev/io/#graphson
54 private static final GraphSONVersion version = GraphSONVersion.V1_0;
56 private final GraphSONMapper mapper =
57 GraphSONMapper.build().version(version).addRegistry(JanusGraphIoRegistry.getInstance()).create();
58 private final GraphSONWriter writer = GraphSONWriter.build().mapper(mapper).create();
61 public Optional<JsonObject> formatObject(Object v) {
62 OutputStream os = new ByteArrayOutputStream();
65 writer.writeVertex(os, (Vertex) v, Direction.BOTH);
67 result = os.toString();
68 } catch (IOException e) {
69 logger.debug("GraphSON writeVertex error : {}", e.getMessage());
72 JsonObject jsonObject = JsonParser.parseString(result).getAsJsonObject();
74 if (jsonObject != null) {
76 if (jsonObject.has("outE")) {
77 JsonObject outEdges = jsonObject.get("outE").getAsJsonObject();
78 removePrivateEdges(jsonObject, outEdges, "outE");
81 if (jsonObject.has("inE")) {
82 JsonObject inEdges = jsonObject.get("inE").getAsJsonObject();
83 removePrivateEdges(jsonObject, inEdges, "inE");
88 return Optional.of(jsonObject);
93 public Optional<JsonObject> formatObject(Object obj, Map<String, List<String>> properties)
94 throws AAIFormatVertexException, AAIFormatQueryResultFormatNotSupported {
95 return Optional.empty();
99 * Removes the private edges from the json object
101 * Please note that the reason to choose to remove the private
102 * edges from the json object instead of removing it from the vertex
103 * itself is the fact that even though the transaction will be rolled back
104 * is because of the possible incosistent behavior where the actual edge
105 * might actually be removed in a long running transaction and is not worth the risk
107 * @param jsonObject - JSON Object from which we are removing the private edges for
108 * @param edges - JSONObject HashMap representing all of the edges
109 * @param edgeDirection - a string indicating the direction of the edge
111 private void removePrivateEdges(JsonObject jsonObject, JsonObject edges, String edgeDirection) {
113 Iterator<Map.Entry<String, JsonElement>> it = edges.entrySet().iterator();
114 while (it.hasNext()) {
115 Map.Entry<String, JsonElement> outEntry = (Map.Entry<String, JsonElement>) it.next();
116 JsonArray edgePropertiesArray = outEntry.getValue().getAsJsonArray();
117 for (int index = 0; index < edgePropertiesArray.size(); ++index) {
118 JsonElement jsonElement = edgePropertiesArray.get(index);
119 JsonObject obj = jsonElement.getAsJsonObject();
120 if (obj.has("properties")) {
121 JsonObject objProperties = obj.get("properties").getAsJsonObject();
122 if (objProperties.has("private")) {
123 boolean isPrivate = objProperties.get("private").getAsBoolean();
125 if (edges.size() == 1) {
126 if (edgePropertiesArray.size() == 1) {
127 jsonObject.remove(edgeDirection);
129 edgePropertiesArray.remove(jsonElement);
132 edgePropertiesArray.remove(jsonElement);
138 if (edgePropertiesArray.size() == 0) {
145 public int parallelThreshold() {