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.restconf.nb.rfc8040.jersey.providers;
10 import com.google.gson.stream.JsonWriter;
11 import java.io.IOException;
12 import java.io.OutputStream;
13 import java.io.OutputStreamWriter;
14 import java.lang.annotation.Annotation;
15 import java.lang.reflect.Type;
16 import java.nio.charset.StandardCharsets;
17 import java.util.List;
20 import javax.ws.rs.Produces;
21 import javax.ws.rs.WebApplicationException;
22 import javax.ws.rs.core.MediaType;
23 import javax.ws.rs.core.MultivaluedMap;
24 import javax.ws.rs.ext.Provider;
25 import org.opendaylight.restconf.common.context.InstanceIdentifierContext;
26 import org.opendaylight.restconf.nb.rfc8040.MediaTypes;
27 import org.opendaylight.restconf.nb.rfc8040.jersey.providers.api.RestconfNormalizedNodeWriter;
28 import org.opendaylight.restconf.nb.rfc8040.legacy.NormalizedNodePayload;
29 import org.opendaylight.yangtools.yang.common.QName;
30 import org.opendaylight.yangtools.yang.common.XMLNamespace;
31 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
32 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
33 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
34 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
35 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
36 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
37 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
38 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
39 import org.opendaylight.yangtools.yang.data.codec.gson.JsonWriterFactory;
40 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
41 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
42 import org.opendaylight.yangtools.yang.model.api.Module;
43 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
44 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
45 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
48 @Produces({ MediaTypes.APPLICATION_YANG_DATA_JSON, MediaType.APPLICATION_JSON })
49 public class JsonNormalizedNodeBodyWriter extends AbstractNormalizedNodeBodyWriter {
50 private static final int DEFAULT_INDENT_SPACES_NUM = 2;
53 public void writeTo(final NormalizedNodePayload context,
55 final Type genericType,
56 final Annotation[] annotations,
57 final MediaType mediaType,
58 final MultivaluedMap<String, Object> httpHeaders,
59 final OutputStream entityStream) throws IOException, WebApplicationException {
60 final NormalizedNode data = context.getData();
65 @SuppressWarnings("unchecked")
66 final InstanceIdentifierContext<SchemaNode> identifierCtx =
67 (InstanceIdentifierContext<SchemaNode>) context.getInstanceIdentifierContext();
68 final SchemaPath path = identifierCtx.getSchemaNode().getPath();
70 try (JsonWriter jsonWriter = createJsonWriter(entityStream, context.getWriterParameters().isPrettyPrint())) {
71 jsonWriter.beginObject();
72 writeNormalizedNode(jsonWriter, path, identifierCtx, data,
73 context.getWriterParameters().getDepth(), context.getWriterParameters().getFields());
74 jsonWriter.endObject();
78 if (httpHeaders != null) {
79 for (final Map.Entry<String, Object> entry : context.getNewHeaders().entrySet()) {
80 httpHeaders.add(entry.getKey(), entry.getValue());
85 private static void writeNormalizedNode(final JsonWriter jsonWriter,
86 final SchemaPath path, final InstanceIdentifierContext<SchemaNode> context, final NormalizedNode data,
87 final Integer depth, final List<Set<QName>> fields) throws IOException {
88 final RestconfNormalizedNodeWriter nnWriter;
90 if (context.getSchemaNode() instanceof RpcDefinition) {
92 * RpcDefinition is not supported as initial codec in JSONStreamWriter,
93 * so we need to emit initial output declaration..
95 nnWriter = createNormalizedNodeWriter(
97 ((RpcDefinition) context.getSchemaNode()).getOutput().getPath(),
101 final Module module = context.getSchemaContext().findModule(data.getIdentifier().getNodeType().getModule())
103 jsonWriter.name(module.getName() + ":output");
104 jsonWriter.beginObject();
105 writeChildren(nnWriter, (ContainerNode) data);
106 jsonWriter.endObject();
107 } else if (context.getSchemaNode() instanceof ActionDefinition) {
109 * ActionDefinition is not supported as initial codec in JSONStreamWriter,
110 * so we need to emit initial output declaration..
112 nnWriter = createNormalizedNodeWriter(context,
113 ((ActionDefinition) context.getSchemaNode()).getOutput().getPath(), jsonWriter, depth, fields);
114 final Module module = context.getSchemaContext().findModule(data.getIdentifier().getNodeType().getModule())
116 jsonWriter.name(module.getName() + ":output");
117 jsonWriter.beginObject();
118 writeChildren(nnWriter, (ContainerNode) data);
119 jsonWriter.endObject();
121 if (SchemaPath.ROOT.equals(path)) {
122 nnWriter = createNormalizedNodeWriter(context, path, jsonWriter, depth, fields);
124 nnWriter = createNormalizedNodeWriter(context, path.getParent(), jsonWriter, depth, fields);
127 if (data instanceof MapEntryNode) {
128 // Restconf allows returning one list item. We need to wrap it
129 // in map node in order to serialize it properly
130 nnWriter.write(ImmutableNodes.mapNodeBuilder(data.getIdentifier().getNodeType())
131 .withChild((MapEntryNode) data)
134 nnWriter.write(data);
141 private static void writeChildren(final RestconfNormalizedNodeWriter nnWriter, final ContainerNode data)
143 for (final DataContainerChild child : data.body()) {
144 nnWriter.write(child);
148 private static RestconfNormalizedNodeWriter createNormalizedNodeWriter(
149 final InstanceIdentifierContext<SchemaNode> context, final SchemaPath path, final JsonWriter jsonWriter,
150 final Integer depth, final List<Set<QName>> fields) {
152 final SchemaNode schema = context.getSchemaNode();
153 final JSONCodecFactory codecs = getCodecFactory(context);
155 final NormalizedNodeStreamWriter streamWriter = JSONNormalizedNodeStreamWriter.createNestedWriter(
156 codecs, path, initialNamespaceFor(schema), jsonWriter);
158 return ParameterAwareNormalizedNodeWriter.forStreamWriter(streamWriter, depth, fields);
161 private static XMLNamespace initialNamespaceFor(final SchemaNode schema) {
162 if (schema instanceof RpcDefinition) {
163 return schema.getQName().getNamespace();
165 // For top-level elements we always want to use namespace prefix, hence use a null initial namespace
169 private static JsonWriter createJsonWriter(final OutputStream entityStream, final boolean prettyPrint) {
171 return JsonWriterFactory.createJsonWriter(
172 new OutputStreamWriter(entityStream, StandardCharsets.UTF_8), DEFAULT_INDENT_SPACES_NUM);
174 return JsonWriterFactory.createJsonWriter(new OutputStreamWriter(entityStream, StandardCharsets.UTF_8));
177 private static JSONCodecFactory getCodecFactory(final InstanceIdentifierContext<?> context) {
178 // TODO: Performance: Cache JSON Codec factory and schema context
179 return JSONCodecFactorySupplier.RFC7951.getShared(context.getSchemaContext());