2 * Copyright © 2021 Orange, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.transportpce.common.converter;
10 import com.google.gson.Gson;
11 import com.google.gson.JsonObject;
12 import com.google.gson.JsonParser;
13 import com.google.gson.stream.JsonReader;
14 import com.google.gson.stream.JsonWriter;
15 import java.io.IOException;
16 import java.io.StringReader;
17 import java.io.StringWriter;
18 import java.io.Writer;
19 import org.opendaylight.mdsal.binding.dom.codec.spi.BindingDOMCodecServices;
20 import org.opendaylight.yangtools.yang.binding.DataObject;
21 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
23 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
24 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
25 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
26 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
27 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
28 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
29 import org.opendaylight.yangtools.yang.data.codec.gson.JsonWriterFactory;
30 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
31 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
32 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
33 import org.opendaylight.yangtools.yang.model.api.EffectiveStatementInference;
34 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
35 import org.slf4j.Logger;
36 import org.slf4j.LoggerFactory;
38 public class JsonStringConverter<T extends DataObject> {
39 private static final Logger LOG = LoggerFactory.getLogger(JsonStringConverter.class);
41 private BindingDOMCodecServices bindingDOMCodecServices;
43 public JsonStringConverter(BindingDOMCodecServices bindingDOMCodecServices) {
44 this.bindingDOMCodecServices = bindingDOMCodecServices;
48 * Create a json string from dataobject T.
49 * @param id InstanceIdentifier
51 * @param supplier RFC7951 or DRAFT_LHOTKA_NETMOD_YANG_JSON_02
52 * @return Json string representation of the object
53 * @throws IOException if something went wrong.
55 public String createJsonStringFromDataObject(final InstanceIdentifier<T> id, T dataObject,
56 JSONCodecFactorySupplier supplier) throws IOException {
58 * This function needs : - context - scPath.getParent() -
59 * scPath.getLastComponent().getNamespace(), -
60 * JsonWriterFactory.createJsonWriter(writer)
63 JSONCodecFactory codecFactory = supplier
64 .getShared(bindingDOMCodecServices.getRuntimeContext().getEffectiveModelContext());
65 try (Writer writer = new StringWriter();
66 JsonWriter jsonWriter = JsonWriterFactory.createJsonWriter(writer, 4);) {
67 EffectiveStatementInference rootNode = SchemaInferenceStack
68 .of(bindingDOMCodecServices.getRuntimeContext().getEffectiveModelContext())
70 rootNode.getEffectiveModelContext();
71 rootNode.getEffectiveModelContext();
72 NormalizedNodeStreamWriter jsonStreamWriter = JSONNormalizedNodeStreamWriter
73 .createExclusiveWriter(codecFactory, rootNode, EffectiveModelContext.NAME.getNamespace(), jsonWriter);
74 try (NormalizedNodeWriter nodeWriter = NormalizedNodeWriter.forStreamWriter(jsonStreamWriter)) {
75 nodeWriter.write(bindingDOMCodecServices.toNormalizedNode(id, dataObject).getValue());
78 JsonObject asJsonObject = JsonParser.parseString(writer.toString()).getAsJsonObject();
79 return new Gson().toJson(asJsonObject);
80 } catch (IOException e) {
81 LOG.error("Cannot convert object {} to string ", dataObject);
87 * Create a dataObject of T type from json string.
88 * @param path YangInstanceIdentifier
89 * @param jsonString String
90 * @param supplier RFC7951 or DRAFT_LHOTKA_NETMOD_YANG_JSON_02
91 * @return T the created object.
93 @SuppressWarnings("unchecked")
94 public T createDataObjectFromJsonString(YangInstanceIdentifier path, String jsonString,
95 JSONCodecFactorySupplier supplier) {
96 JsonReader reader = new JsonReader(new StringReader(jsonString));
97 NormalizedNodeResult result = new NormalizedNodeResult();
98 try (NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
99 JsonParserStream jsonParser = JsonParserStream
102 supplier.getShared(bindingDOMCodecServices.getRuntimeContext().getEffectiveModelContext()))) {
103 jsonParser.parse(reader);
104 return (T) bindingDOMCodecServices.fromNormalizedNode(path, result.getResult()).getValue();
105 } catch (IOException e) {
106 LOG.warn("An error occured during parsing Json input stream", e);