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.common.collect.FluentIterable;
11 import com.google.gson.Gson;
12 import com.google.gson.JsonObject;
13 import com.google.gson.JsonParser;
14 import com.google.gson.stream.JsonReader;
15 import com.google.gson.stream.JsonWriter;
16 import java.io.IOException;
17 import java.io.StringReader;
18 import java.io.StringWriter;
19 import java.io.Writer;
20 import org.opendaylight.mdsal.binding.dom.codec.spi.BindingDOMCodecServices;
21 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
22 import org.opendaylight.yangtools.yang.binding.DataObject;
23 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
25 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
26 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
27 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
28 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
29 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
30 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
31 import org.opendaylight.yangtools.yang.data.codec.gson.JsonWriterFactory;
32 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
33 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
34 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
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);
40 private static final JsonParser PARSER = new JsonParser();
41 private BindingDOMCodecServices bindingDOMCodecServices;
44 public JsonStringConverter(BindingDOMCodecServices bindingDOMCodecServices) {
45 this.bindingDOMCodecServices = bindingDOMCodecServices;
49 * Create a json string from dataobject T.
50 * @param id InstanceIdentifier
52 * @param supplier RFC7951 or DRAFT_LHOTKA_NETMOD_YANG_JSON_02
53 * @return Json string representation of the object
54 * @throws IOException if something went wrong.
56 public String createJsonStringFromDataObject(final InstanceIdentifier<T> id, T dataObject,
57 JSONCodecFactorySupplier supplier) throws IOException {
58 final SchemaPath scPath = SchemaPath.create(FluentIterable.from(id.getPathArguments())
59 .transform(input -> BindingReflections.findQName(input.getType())), true);
61 * This function needs : - context - scPath.getParent() -
62 * scPath.getLastComponent().getNamespace(), -
63 * JsonWriterFactory.createJsonWriter(writer)
66 JSONCodecFactory codecFactory = supplier
67 .getShared(bindingDOMCodecServices.getRuntimeContext().getEffectiveModelContext());
68 try (Writer writer = new StringWriter();
69 JsonWriter jsonWriter = JsonWriterFactory.createJsonWriter(writer, 4);) {
70 NormalizedNodeStreamWriter jsonStreamWriter = JSONNormalizedNodeStreamWriter.createExclusiveWriter(
71 codecFactory, scPath.getParent(), scPath.getLastComponent().getNamespace(), jsonWriter);
72 try (NormalizedNodeWriter nodeWriter = NormalizedNodeWriter.forStreamWriter(jsonStreamWriter)) {
73 nodeWriter.write(bindingDOMCodecServices.toNormalizedNode(id, dataObject).getValue());
76 JsonObject asJsonObject = PARSER.parse(writer.toString()).getAsJsonObject();
77 return new Gson().toJson(asJsonObject);
78 } catch (IOException e) {
79 LOG.error("Cannot convert object {} to string ", dataObject);
85 * Create a dataObject of T type from json string.
86 * @param path YangInstanceIdentifier
87 * @param jsonString String
88 * @param supplier RFC7951 or DRAFT_LHOTKA_NETMOD_YANG_JSON_02
89 * @return T the created object.
91 public T createDataObjectFromJsonString(YangInstanceIdentifier path, String jsonString,
92 JSONCodecFactorySupplier supplier) {
93 JsonReader reader = new JsonReader(new StringReader(jsonString));
94 NormalizedNodeResult result = new NormalizedNodeResult();
95 try (NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
96 JsonParserStream jsonParser = JsonParserStream.create(streamWriter,
98 .getShared(bindingDOMCodecServices.getRuntimeContext().getEffectiveModelContext()))) {
99 jsonParser.parse(reader);
100 return (T) bindingDOMCodecServices
101 .fromNormalizedNode(path, result.getResult()).getValue();
102 } catch (IOException e) {
103 LOG.warn("An error occured during parsing Json input stream", e);