2 * Copyright (c) 2014 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 com.google.common.base.Preconditions;
11 import com.google.gson.stream.JsonWriter;
12 import java.io.IOException;
14 import org.opendaylight.yangtools.yang.common.QName;
15 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
16 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
17 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
18 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
19 import org.opendaylight.yangtools.yang.data.impl.codec.SchemaTracker;
20 import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
21 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
22 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
23 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
24 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
27 * This implementation will create JSON output as output stream.
29 * Values of leaf and leaf-list are NOT translated according to codecs.
32 public final class JSONNormalizedNodeStreamWriter implements NormalizedNodeStreamWriter {
34 * RFC6020 deviation: we are not required to emit empty containers unless they
35 * are marked as 'presence'.
37 private static final boolean DEFAULT_EMIT_EMPTY_CONTAINERS = true;
39 private final SchemaTracker tracker;
40 private final JSONCodecFactory codecs;
41 private final JsonWriter writer;
42 private JSONStreamWriterContext context;
44 private JSONNormalizedNodeStreamWriter(final JSONCodecFactory codecFactory, final SchemaPath path, final JsonWriter JsonWriter, final JSONStreamWriterRootContext rootContext) {
45 this.writer = Preconditions.checkNotNull(JsonWriter);
46 this.codecs = Preconditions.checkNotNull(codecFactory);
47 this.tracker = SchemaTracker.create(codecFactory.getSchemaContext(), path);
48 this.context = Preconditions.checkNotNull(rootContext);
52 * Create a new stream writer, which writes to the specified output stream.
54 * The codec factory can be reused between multiple writers.
56 * Returned writer is exclusive user of JsonWriter, which means it will start
57 * top-level JSON element and ends it.
59 * This instance of writer can be used only to emit one top level element,
60 * otherwise it will produce incorrect JSON.
62 * @param codecFactory JSON codec factory
63 * @param path Schema Path
64 * @param initialNs Initial namespace
65 * @param jsonWriter JsonWriter
66 * @return A stream writer instance
68 public static NormalizedNodeStreamWriter createExclusiveWriter(final JSONCodecFactory codecFactory, final SchemaPath path, final URI initialNs, final JsonWriter jsonWriter) {
69 return new JSONNormalizedNodeStreamWriter(codecFactory, path, jsonWriter, new JSONStreamWriterExclusiveRootContext(initialNs));
73 * Create a new stream writer, which writes to the specified output stream.
75 * The codec factory can be reused between multiple writers.
77 * Returned writer can be used emit multiple top level element,
78 * but does not start / close parent JSON object, which must be done
79 * by user providing {@code jsonWriter} instance in order for
82 * @param codecFactory JSON codec factory
83 * @param path Schema Path
84 * @param initialNs Initial namespace
85 * @param jsonWriter JsonWriter
86 * @return A stream writer instance
88 public static NormalizedNodeStreamWriter createNestedWriter(final JSONCodecFactory codecFactory, final SchemaPath path, final URI initialNs, final JsonWriter jsonWriter) {
89 return new JSONNormalizedNodeStreamWriter(codecFactory, path, jsonWriter, new JSONStreamWriterSharedRootContext(initialNs));
93 public void leafNode(final NodeIdentifier name, final Object value) throws IOException {
94 final LeafSchemaNode schema = tracker.leafNode(name);
95 final JSONCodec<Object> codec = codecs.codecFor(schema);
96 context.emittingChild(codecs.getSchemaContext(), writer);
97 context.writeChildJsonIdentifier(codecs.getSchemaContext(), writer, name.getNodeType());
98 writeValue(value, codec);
102 public void startLeafSet(final NodeIdentifier name, final int childSizeHint) throws IOException {
103 tracker.startLeafSet(name);
104 context = new JSONStreamWriterListContext(context, name);
108 public void leafSetEntryNode(final QName name, final Object value) throws IOException {
109 final LeafListSchemaNode schema = tracker.leafSetEntryNode();
110 final JSONCodec<Object> codec = codecs.codecFor(schema);
111 context.emittingChild(codecs.getSchemaContext(), writer);
112 writeValue(value, codec);
116 public void startOrderedLeafSet(final NodeIdentifier name, final int childSizeHint) throws IOException {
117 tracker.startLeafSet(name);
118 context = new JSONStreamWriterListContext(context, name);
122 * Warning suppressed due to static final constant which triggers a warning
123 * for the call to schema.isPresenceContainer().
125 @SuppressWarnings("unused")
127 public void startContainerNode(final NodeIdentifier name, final int childSizeHint) throws IOException {
128 final SchemaNode schema = tracker.startContainerNode(name);
130 // FIXME this code ignores presence for containers
131 // but datastore does as well and it needs be fixed first (2399)
132 context = new JSONStreamWriterNamedObjectContext(context, name, DEFAULT_EMIT_EMPTY_CONTAINERS);
136 public void startUnkeyedList(final NodeIdentifier name, final int childSizeHint) throws IOException {
137 tracker.startList(name);
138 context = new JSONStreamWriterListContext(context, name);
142 public void startUnkeyedListItem(final NodeIdentifier name, final int childSizeHint) throws IOException {
143 tracker.startListItem(name);
144 context = new JSONStreamWriterObjectContext(context, name, DEFAULT_EMIT_EMPTY_CONTAINERS);
148 public void startMapNode(final NodeIdentifier name, final int childSizeHint) throws IOException {
149 tracker.startList(name);
150 context = new JSONStreamWriterListContext(context, name);
154 public void startMapEntryNode(final NodeIdentifierWithPredicates identifier, final int childSizeHint)
156 tracker.startListItem(identifier);
157 context = new JSONStreamWriterObjectContext(context, identifier, DEFAULT_EMIT_EMPTY_CONTAINERS);
161 public void startOrderedMapNode(final NodeIdentifier name, final int childSizeHint) throws IOException {
162 tracker.startList(name);
163 context = new JSONStreamWriterListContext(context, name);
167 public void startChoiceNode(final NodeIdentifier name, final int childSizeHint) {
168 tracker.startChoiceNode(name);
169 context = new JSONStreamWriterInvisibleContext(context);
173 public void startAugmentationNode(final AugmentationIdentifier identifier) {
174 tracker.startAugmentationNode(identifier);
175 context = new JSONStreamWriterInvisibleContext(context);
179 public void anyxmlNode(final NodeIdentifier name, final Object value) throws IOException {
180 @SuppressWarnings("unused")
181 final AnyXmlSchemaNode schema = tracker.anyxmlNode(name);
182 // FIXME: should have a codec based on this :)
184 context.emittingChild(codecs.getSchemaContext(), writer);
185 context.writeChildJsonIdentifier(codecs.getSchemaContext(), writer, name.getNodeType());
186 // FIXME this kind of serialization is incorrect since the value for AnyXml is now a DOMSource
187 writer.value(String.valueOf(value));
191 public void startYangModeledAnyXmlNode(final NodeIdentifier name, final int childSizeHint) throws IOException {
192 tracker.startYangModeledAnyXmlNode(name);
193 context = new JSONStreamWriterNamedObjectContext(context, name, true);
197 public void endNode() throws IOException {
199 context = context.endNode(codecs.getSchemaContext(), writer);
201 if(context instanceof JSONStreamWriterRootContext) {
202 context.emitEnd(writer);
206 private void writeValue(final Object value, final JSONCodec<Object> codec)
208 codec.serializeToWriter(writer,value);
212 public void flush() throws IOException {
217 public void close() throws IOException {