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
9 package org.opendaylight.restconf.nb.rfc8040.jersey.providers;
11 import com.google.gson.stream.JsonWriter;
12 import java.io.IOException;
13 import java.io.OutputStream;
14 import java.io.OutputStreamWriter;
15 import java.lang.annotation.Annotation;
16 import java.lang.reflect.Type;
18 import java.nio.charset.StandardCharsets;
19 import java.util.List;
21 import javax.ws.rs.Produces;
22 import javax.ws.rs.WebApplicationException;
23 import javax.ws.rs.core.MediaType;
24 import javax.ws.rs.core.MultivaluedMap;
25 import javax.ws.rs.ext.MessageBodyWriter;
26 import javax.ws.rs.ext.Provider;
27 import org.opendaylight.restconf.common.context.InstanceIdentifierContext;
28 import org.opendaylight.restconf.common.context.NormalizedNodeContext;
29 import org.opendaylight.restconf.nb.rfc8040.Rfc8040;
30 import org.opendaylight.restconf.nb.rfc8040.jersey.providers.api.RestconfNormalizedNodeWriter;
31 import org.opendaylight.restconf.nb.rfc8040.utils.RestconfConstants;
32 import org.opendaylight.yangtools.yang.common.QName;
33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
34 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
35 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
36 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
37 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
38 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
39 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
40 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
41 import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
42 import org.opendaylight.yangtools.yang.data.codec.gson.JsonWriterFactory;
43 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
44 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
45 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
46 import org.opendaylight.yangtools.yang.model.api.Module;
47 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
48 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
49 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
50 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
53 @Produces({ Rfc8040.MediaTypes.DATA + RestconfConstants.JSON, MediaType.APPLICATION_JSON })
54 public class NormalizedNodeJsonBodyWriter implements MessageBodyWriter<NormalizedNodeContext> {
56 private static final int DEFAULT_INDENT_SPACES_NUM = 2;
59 public boolean isWriteable(final Class<?> type,
60 final Type genericType,
61 final Annotation[] annotations,
62 final MediaType mediaType) {
63 return type.equals(NormalizedNodeContext.class);
67 public long getSize(final NormalizedNodeContext context,
69 final Type genericType,
70 final Annotation[] annotations,
71 final MediaType mediaType) {
76 public void writeTo(final NormalizedNodeContext context,
78 final Type genericType,
79 final Annotation[] annotations,
80 final MediaType mediaType,
81 final MultivaluedMap<String, Object> httpHeaders,
82 final OutputStream entityStream) throws IOException, WebApplicationException {
83 final NormalizedNode<?, ?> data = context.getData();
88 @SuppressWarnings("unchecked")
89 final InstanceIdentifierContext<SchemaNode> identifierCtx =
90 (InstanceIdentifierContext<SchemaNode>) context.getInstanceIdentifierContext();
91 final SchemaPath path = identifierCtx.getSchemaNode().getPath();
93 try (JsonWriter jsonWriter = createJsonWriter(entityStream, context.getWriterParameters().isPrettyPrint())) {
94 jsonWriter.beginObject();
95 writeNormalizedNode(jsonWriter, path, identifierCtx, data,
96 context.getWriterParameters().getDepth(), context.getWriterParameters().getFields());
97 jsonWriter.endObject();
102 private static void writeNormalizedNode(final JsonWriter jsonWriter,
103 final SchemaPath path, final InstanceIdentifierContext<SchemaNode> context, final NormalizedNode<?, ?> data,
104 final Integer depth, final List<Set<QName>> fields) throws IOException {
105 final RestconfNormalizedNodeWriter nnWriter;
107 if (context.getSchemaNode() instanceof RpcDefinition) {
109 * RpcDefinition is not supported as initial codec in JSONStreamWriter,
110 * so we need to emit initial output declaration..
112 nnWriter = createNormalizedNodeWriter(
114 ((RpcDefinition) context.getSchemaNode()).getOutput().getPath(),
118 final Module module = context.getSchemaContext().findModule(data.getNodeType().getModule()).get();
119 jsonWriter.name(module.getName() + ":output");
120 jsonWriter.beginObject();
121 writeChildren(nnWriter, (ContainerNode) data);
122 jsonWriter.endObject();
123 } else if (context.getSchemaNode() instanceof ActionDefinition) {
125 * ActionDefinition is not supported as initial codec in JSONStreamWriter,
126 * so we need to emit initial output declaration..
128 nnWriter = createNormalizedNodeWriter(context,
129 ((ActionDefinition) context.getSchemaNode()).getOutput().getPath(), jsonWriter, depth, fields);
130 final Module module = context.getSchemaContext().findModule(data.getNodeType().getModule()).get();
131 jsonWriter.name(module.getName() + ":output");
132 jsonWriter.beginObject();
133 writeChildren(nnWriter, (ContainerNode) data);
134 jsonWriter.endObject();
136 if (SchemaPath.ROOT.equals(path)) {
137 nnWriter = createNormalizedNodeWriter(context, path, jsonWriter, depth, fields);
139 nnWriter = createNormalizedNodeWriter(context, path.getParent(), jsonWriter, depth, fields);
142 if (data instanceof MapEntryNode) {
143 // Restconf allows returning one list item. We need to wrap it
144 // in map node in order to serialize it properly
146 ImmutableNodes.mapNodeBuilder(data.getNodeType()).withChild((MapEntryNode) data).build());
148 nnWriter.write(data);
155 private static void writeChildren(final RestconfNormalizedNodeWriter nnWriter,
156 final ContainerNode data) throws IOException {
157 for (final DataContainerChild<? extends PathArgument, ?> child : data.getValue()) {
158 nnWriter.write(child);
162 private static RestconfNormalizedNodeWriter createNormalizedNodeWriter(
163 final InstanceIdentifierContext<SchemaNode> context, final SchemaPath path, final JsonWriter jsonWriter,
164 final Integer depth, final List<Set<QName>> fields) {
166 final SchemaNode schema = context.getSchemaNode();
167 final JSONCodecFactory codecs = getCodecFactory(context);
169 final NormalizedNodeStreamWriter streamWriter = JSONNormalizedNodeStreamWriter.createNestedWriter(
170 codecs, path, initialNamespaceFor(schema, depth), jsonWriter);
172 return ParameterAwareNormalizedNodeWriter.forStreamWriter(streamWriter, depth, fields);
175 private static URI initialNamespaceFor(final SchemaNode schema, final Integer depth) {
176 if (schema instanceof RpcDefinition) {
177 return schema.getQName().getNamespace();
179 // For top-level elements we always want to use namespace prefix, hence use a null initial namespace
180 if (depth == null || depth == 0 || schema instanceof SchemaContext) {
183 return schema instanceof DataSchemaNode && !((DataSchemaNode)schema).isAugmenting()
184 ? schema.getQName().getNamespace() : null;
187 private static JsonWriter createJsonWriter(final OutputStream entityStream, final boolean prettyPrint) {
189 return JsonWriterFactory.createJsonWriter(
190 new OutputStreamWriter(entityStream, StandardCharsets.UTF_8), DEFAULT_INDENT_SPACES_NUM);
192 return JsonWriterFactory.createJsonWriter(new OutputStreamWriter(entityStream, StandardCharsets.UTF_8));
195 private static JSONCodecFactory getCodecFactory(final InstanceIdentifierContext<?> context) {
196 // TODO: Performance: Cache JSON Codec factory and schema context
197 return JSONCodecFactorySupplier.RFC7951.getShared(context.getSchemaContext());