2 * Copyright (c) 2016 Cisco Systems, 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.yangtools.yang.data.codec.gson;
10 import static org.opendaylight.yangtools.yang.data.codec.gson.TestUtils.loadTextFile;
12 import com.google.gson.stream.JsonReader;
14 import java.io.IOException;
15 import java.io.StringReader;
16 import java.io.StringWriter;
17 import java.net.URISyntaxException;
18 import org.junit.AfterClass;
19 import org.junit.BeforeClass;
20 import org.junit.Test;
21 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
22 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
23 import org.opendaylight.yangtools.yang.data.api.schema.stream.LoggingNormalizedNodeStreamWriter;
24 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
25 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
26 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
27 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
28 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
29 import org.slf4j.Logger;
30 import org.slf4j.LoggerFactory;
32 public class StreamToNormalizedNodeTest extends AbstractComplexJsonTest {
33 private static final Logger LOG = LoggerFactory.getLogger(StreamToNormalizedNodeTest.class);
34 private static String streamAsString;
37 public static void initialization() throws IOException, URISyntaxException {
38 streamAsString = loadTextFile(new File(StreamToNormalizedNodeTest.class.getResource(
39 "/complexjson/complex-json.json").toURI()));
43 public static void cleanup() {
44 streamAsString = null;
48 * Demonstrates how to log events produced by a {@link JsonReader}.
51 public void ownStreamWriterImplementationDemonstration() throws IOException {
52 // GSON's JsonReader reading from the loaded string (our event source)
53 final JsonReader reader = new JsonReader(new StringReader(streamAsString));
55 // StreamWriter which outputs SLF4J events
56 final LoggingNormalizedNodeStreamWriter logWriter = new LoggingNormalizedNodeStreamWriter();
58 // JSON -> StreamWriter parser
59 try (JsonParserStream jsonHandler = JsonParserStream.create(logWriter, lhotkaCodecFactory)) {
60 // Process multiple readers, flush()/close() as needed
61 jsonHandler.parse(reader);
66 * Demonstrates how to create an immutable NormalizedNode tree from a {@link JsonReader} and
67 * then writes the data back into string representation.
70 public void immutableNormalizedNodeStreamWriterDemonstration() throws IOException {
72 * This is the parsing part
74 // This is where we will output the nodes
75 NormalizedNodeResult result = new NormalizedNodeResult();
77 // StreamWriter which attaches NormalizedNode under parent
78 final NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
80 // JSON -> StreamWriter parser
81 try (JsonParserStream handler = JsonParserStream.create(streamWriter, lhotkaCodecFactory)) {
82 handler.parse(new JsonReader(new StringReader(streamAsString)));
85 // Finally build the node
86 final NormalizedNode parsedData = result.getResult();
87 LOG.debug("Parsed NormalizedNodes: {}", parsedData);
90 * This is the serialization part.
92 // We want to write the first child out
93 final DataContainerChild firstChild = (DataContainerChild) parsedData;
94 LOG.debug("Serializing first child: {}", firstChild);
97 final StringWriter writer = new StringWriter();
99 // StreamWriter which outputs JSON strings
100 // StreamWriter which outputs JSON strings
101 final NormalizedNodeStreamWriter jsonStream = JSONNormalizedNodeStreamWriter.createExclusiveWriter(
102 lhotkaCodecFactory, SchemaPath.ROOT, null, JsonWriterFactory.createJsonWriter(writer, 2));
104 // NormalizedNode -> StreamWriter
105 final NormalizedNodeWriter nodeWriter = NormalizedNodeWriter.forStreamWriter(jsonStream);
107 // Write multiple NormalizedNodes fluently, flush()/close() as needed
108 nodeWriter.write(firstChild).close();
110 // Just to put it somewhere
111 LOG.debug("Serialized JSON: {}", writer.toString());