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.loadModules;
11 import static org.opendaylight.yangtools.yang.data.codec.gson.TestUtils.loadTextFile;
13 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
15 import com.google.gson.stream.JsonReader;
17 import java.io.IOException;
18 import java.io.StringReader;
19 import java.io.StringWriter;
20 import java.net.URISyntaxException;
21 import org.junit.BeforeClass;
22 import org.junit.Ignore;
23 import org.junit.Test;
24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
25 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
26 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
27 import org.opendaylight.yangtools.yang.data.api.schema.stream.LoggingNormalizedNodeStreamWriter;
28 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
29 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
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.SchemaContext;
33 import org.opendaylight.yangtools.yang.parser.spi.meta.ReactorException;
34 import org.slf4j.Logger;
35 import org.slf4j.LoggerFactory;
37 public class StreamToNormalizedNodeTest {
38 private static final Logger LOG = LoggerFactory.getLogger(StreamToNormalizedNodeTest.class);
39 private static SchemaContext schemaContext;
40 private static String streamAsString;
43 public static void initialization() throws IOException, URISyntaxException, ReactorException {
44 schemaContext = loadModules("/complexjson/yang");
45 streamAsString = loadTextFile(new File(StreamToNormalizedNodeTest.class.getResource(
46 "/complexjson/complex-json.json").toURI()));
50 * Demonstrates how to log events produced by a {@link JsonReader}.
55 public void ownStreamWriterImplementationDemonstration() throws IOException {
56 // GSON's JsonReader reading from the loaded string (our event source)
57 final JsonReader reader = new JsonReader(new StringReader(streamAsString));
59 // StreamWriter which outputs SLF4J events
60 final LoggingNormalizedNodeStreamWriter logWriter = new LoggingNormalizedNodeStreamWriter();
62 // JSON -> StreamWriter parser
63 try (final JsonParserStream jsonHandler = JsonParserStream.create(logWriter, schemaContext)) {
64 // Process multiple readers, flush()/close() as needed
65 jsonHandler.parse(reader);
70 * Demonstrates how to create an immutable NormalizedNode tree from a {@link JsonReader} and
71 * then writes the data back into string representation.
77 public void immutableNormalizedNodeStreamWriterDemonstration() throws IOException {
79 * This is the parsing part
81 // This is where we will output the nodes
82 NormalizedNodeResult result = new NormalizedNodeResult();
84 // StreamWriter which attaches NormalizedNode under parent
85 final NormalizedNodeStreamWriter streamWriter = ImmutableNormalizedNodeStreamWriter.from(result);
87 // JSON -> StreamWriter parser
88 try (JsonParserStream handler = JsonParserStream.create(streamWriter, schemaContext)) {
89 handler.parse(new JsonReader(new StringReader(streamAsString)));
92 // Finally build the node
93 final NormalizedNode<?, ?> parsedData = result.getResult();
94 LOG.debug("Parsed NormalizedNodes: {}", parsedData);
97 * This is the serialization part.
99 // We want to write the first child out
100 final DataContainerChild<? extends PathArgument, ?> firstChild = (DataContainerChild<? extends PathArgument, ?>) parsedData;
101 LOG.debug("Serializing first child: {}", firstChild);
104 final StringWriter writer = new StringWriter();
106 // StreamWriter which outputs JSON strings
107 // StreamWriter which outputs JSON strings
108 final NormalizedNodeStreamWriter jsonStream = JSONNormalizedNodeStreamWriter.
109 createExclusiveWriter(JSONCodecFactory.create(schemaContext), SchemaPath.ROOT, null,
110 JsonWriterFactory.createJsonWriter(writer, 2));
112 // NormalizedNode -> StreamWriter
113 final NormalizedNodeWriter nodeWriter = NormalizedNodeWriter.forStreamWriter(jsonStream);
115 // Write multiple NormalizedNodes fluently, flush()/close() as needed
116 nodeWriter.write(firstChild).close();
118 // Just to put it somewhere
119 LOG.debug("Serialized JSON: {}", writer.toString());