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.annotations.Beta;
11 import com.google.common.base.Preconditions;
12 import com.google.gson.JsonIOException;
13 import com.google.gson.JsonParseException;
14 import com.google.gson.JsonSyntaxException;
15 import com.google.gson.stream.JsonReader;
16 import com.google.gson.stream.MalformedJsonException;
17 import java.io.Closeable;
18 import java.io.EOFException;
19 import java.io.Flushable;
20 import java.io.IOException;
22 import java.util.ArrayDeque;
23 import java.util.Collections;
24 import java.util.Deque;
25 import java.util.HashSet;
27 import javax.xml.transform.dom.DOMSource;
28 import org.opendaylight.yangtools.util.xml.UntrustedXML;
29 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
30 import org.opendaylight.yangtools.yang.data.util.AbstractNodeDataWithSchema;
31 import org.opendaylight.yangtools.yang.data.util.AnyXmlNodeDataWithSchema;
32 import org.opendaylight.yangtools.yang.data.util.CompositeNodeDataWithSchema;
33 import org.opendaylight.yangtools.yang.data.util.LeafListEntryNodeDataWithSchema;
34 import org.opendaylight.yangtools.yang.data.util.LeafListNodeDataWithSchema;
35 import org.opendaylight.yangtools.yang.data.util.LeafNodeDataWithSchema;
36 import org.opendaylight.yangtools.yang.data.util.ListEntryNodeDataWithSchema;
37 import org.opendaylight.yangtools.yang.data.util.ListNodeDataWithSchema;
38 import org.opendaylight.yangtools.yang.data.util.ParserStreamUtils;
39 import org.opendaylight.yangtools.yang.data.util.RpcAsContainer;
40 import org.opendaylight.yangtools.yang.data.util.SimpleNodeDataWithSchema;
41 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
42 import org.opendaylight.yangtools.yang.model.api.ChoiceSchemaNode;
43 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
44 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
45 import org.opendaylight.yangtools.yang.model.api.Module;
46 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
47 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
48 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
49 import org.opendaylight.yangtools.yang.model.api.TypedSchemaNode;
50 import org.opendaylight.yangtools.yang.model.api.YangModeledAnyXmlSchemaNode;
51 import org.w3c.dom.Document;
52 import org.w3c.dom.Element;
53 import org.w3c.dom.Text;
56 * This class parses JSON elements from a GSON JsonReader. It disallows multiple elements of the same name unlike the
57 * default GSON JsonParser.
60 public final class JsonParserStream implements Closeable, Flushable {
61 static final String ANYXML_ARRAY_ELEMENT_ID = "array-element";
63 private final Deque<URI> namespaces = new ArrayDeque<>();
64 private final NormalizedNodeStreamWriter writer;
65 private final JSONCodecFactory codecs;
66 private final SchemaContext schema;
67 private final DataSchemaNode parentNode;
69 private JsonParserStream(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
70 final JSONCodecFactory codecs, final DataSchemaNode parentNode) {
71 this.schema = Preconditions.checkNotNull(schemaContext);
72 this.writer = Preconditions.checkNotNull(writer);
73 this.codecs = Preconditions.checkNotNull(codecs);
74 this.parentNode = parentNode;
77 private JsonParserStream(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
78 final DataSchemaNode parentNode) {
79 this(writer, schemaContext, JSONCodecFactory.getShared(schemaContext), parentNode);
82 public static JsonParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
83 final SchemaNode parentNode) {
84 if (parentNode instanceof RpcDefinition) {
85 return new JsonParserStream(writer, schemaContext, new RpcAsContainer((RpcDefinition) parentNode));
87 Preconditions.checkArgument(parentNode instanceof DataSchemaNode, "Instance of DataSchemaNode class awaited.");
88 return new JsonParserStream(writer, schemaContext, (DataSchemaNode) parentNode);
91 public static JsonParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext) {
92 return new JsonParserStream(writer, schemaContext, schemaContext);
95 public JsonParserStream parse(final JsonReader reader) {
96 // code copied from gson's JsonParser and Stream classes
98 final boolean lenient = reader.isLenient();
99 reader.setLenient(true);
100 boolean isEmpty = true;
104 final CompositeNodeDataWithSchema compositeNodeDataWithSchema = new CompositeNodeDataWithSchema(parentNode);
105 read(reader, compositeNodeDataWithSchema);
106 compositeNodeDataWithSchema.write(writer);
109 } catch (final EOFException e) {
113 // The stream ended prematurely so it is likely a syntax error.
114 throw new JsonSyntaxException(e);
115 } catch (final MalformedJsonException | NumberFormatException e) {
116 throw new JsonSyntaxException(e);
117 } catch (final IOException e) {
118 throw new JsonIOException(e);
119 } catch (StackOverflowError | OutOfMemoryError e) {
120 throw new JsonParseException("Failed parsing JSON source: " + reader + " to Json", e);
122 reader.setLenient(lenient);
126 private void traverseAnyXmlValue(final JsonReader in, final Document doc, final Element parentElement)
131 Text textNode = doc.createTextNode(in.nextString());
132 parentElement.appendChild(textNode);
135 textNode = doc.createTextNode(Boolean.toString(in.nextBoolean()));
136 parentElement.appendChild(textNode);
140 textNode = doc.createTextNode("null");
141 parentElement.appendChild(textNode);
145 while (in.hasNext()) {
146 final Element childElement = doc.createElement(ANYXML_ARRAY_ELEMENT_ID);
147 parentElement.appendChild(childElement);
148 traverseAnyXmlValue(in, doc, childElement);
154 while (in.hasNext()) {
155 final Element childElement = doc.createElement(in.nextName());
156 parentElement.appendChild(childElement);
157 traverseAnyXmlValue(in, doc, childElement);
168 private void readAnyXmlValue(final JsonReader in, final AnyXmlNodeDataWithSchema parent,
169 final String anyXmlObjectName) throws IOException {
170 final String anyXmlObjectNS = getCurrentNamespace().toString();
171 final Document doc = UntrustedXML.newDocumentBuilder().newDocument();
172 final Element rootElement = doc.createElementNS(anyXmlObjectNS, anyXmlObjectName);
173 doc.appendChild(rootElement);
174 traverseAnyXmlValue(in, doc, rootElement);
176 final DOMSource domSource = new DOMSource(doc.getDocumentElement());
177 parent.setValue(domSource);
180 public void read(final JsonReader in, AbstractNodeDataWithSchema parent) throws IOException {
184 setValue(parent, in.nextString());
187 setValue(parent, Boolean.toString(in.nextBoolean()));
191 setValue(parent, null);
195 while (in.hasNext()) {
196 if (parent instanceof LeafNodeDataWithSchema) {
199 final AbstractNodeDataWithSchema newChild = newArrayEntry(parent);
206 final Set<String> namesakes = new HashSet<>();
209 * This allows parsing of incorrectly /as showcased/
210 * in testconf nesting of list items - eg.
211 * lists with one value are sometimes serialized
212 * without wrapping array.
215 if (isArray(parent)) {
216 parent = newArrayEntry(parent);
218 while (in.hasNext()) {
219 final String jsonElementName = in.nextName();
220 DataSchemaNode parentSchema = parent.getSchema();
221 if (parentSchema instanceof YangModeledAnyXmlSchemaNode) {
222 parentSchema = ((YangModeledAnyXmlSchemaNode) parentSchema).getSchemaOfAnyXmlData();
224 final NamespaceAndName namespaceAndName = resolveNamespace(jsonElementName, parentSchema);
225 final String localName = namespaceAndName.getName();
226 addNamespace(namespaceAndName.getUri());
227 if (!namesakes.add(jsonElementName)) {
228 throw new JsonSyntaxException("Duplicate name " + jsonElementName + " in JSON input.");
231 final Deque<DataSchemaNode> childDataSchemaNodes = ParserStreamUtils.findSchemaNodeByNameAndNamespace(
232 parentSchema, localName, getCurrentNamespace());
233 Preconditions.checkState(!childDataSchemaNodes.isEmpty(),
234 "Schema for node with name %s and namespace %s does not exist.", localName, getCurrentNamespace());
236 final AbstractNodeDataWithSchema newChild = ((CompositeNodeDataWithSchema) parent)
237 .addChild(childDataSchemaNodes);
238 if (newChild instanceof AnyXmlNodeDataWithSchema) {
239 readAnyXmlValue(in, (AnyXmlNodeDataWithSchema) newChild, jsonElementName);
255 private static boolean isArray(final AbstractNodeDataWithSchema parent) {
256 return parent instanceof ListNodeDataWithSchema || parent instanceof LeafListNodeDataWithSchema;
259 private static AbstractNodeDataWithSchema newArrayEntry(final AbstractNodeDataWithSchema parent) {
260 AbstractNodeDataWithSchema newChild;
261 if (parent instanceof ListNodeDataWithSchema) {
262 newChild = new ListEntryNodeDataWithSchema(parent.getSchema());
263 } else if (parent instanceof LeafListNodeDataWithSchema) {
264 newChild = new LeafListEntryNodeDataWithSchema(parent.getSchema());
266 throw new IllegalStateException("Found an unexpected array nested under "+ parent.getSchema().getQName());
268 ((CompositeNodeDataWithSchema) parent).addChild(newChild);
272 private void setValue(final AbstractNodeDataWithSchema parent, final String value) {
273 Preconditions.checkArgument(parent instanceof SimpleNodeDataWithSchema, "Node %s is not a simple type",
274 parent.getSchema().getQName());
275 final SimpleNodeDataWithSchema parentSimpleNode = (SimpleNodeDataWithSchema) parent;
276 Preconditions.checkArgument(parentSimpleNode.getValue() == null, "Node '%s' has already set its value to '%s'",
277 parentSimpleNode.getSchema().getQName(), parentSimpleNode.getValue());
279 final Object translatedValue = translateValueByType(value, parentSimpleNode.getSchema());
280 parentSimpleNode.setValue(translatedValue);
283 private Object translateValueByType(final String value, final DataSchemaNode node) {
284 Preconditions.checkArgument(node instanceof TypedSchemaNode);
285 return codecs.codecFor((TypedSchemaNode) node).parseValue(null, value);
288 private void removeNamespace() {
292 private void addNamespace(final URI namespace) {
293 namespaces.push(namespace);
296 private NamespaceAndName resolveNamespace(final String childName, final DataSchemaNode dataSchemaNode) {
297 final int lastIndexOfColon = childName.lastIndexOf(':');
298 String moduleNamePart = null;
299 String nodeNamePart = null;
300 URI namespace = null;
301 if (lastIndexOfColon != -1) {
302 moduleNamePart = childName.substring(0, lastIndexOfColon);
303 nodeNamePart = childName.substring(lastIndexOfColon + 1);
305 final Module m = schema.findModuleByName(moduleNamePart, null);
306 namespace = m == null ? null : m.getNamespace();
308 nodeNamePart = childName;
311 if (namespace == null) {
312 Set<URI> potentialUris = Collections.emptySet();
313 potentialUris = resolveAllPotentialNamespaces(nodeNamePart, dataSchemaNode);
314 if (potentialUris.contains(getCurrentNamespace())) {
315 namespace = getCurrentNamespace();
316 } else if (potentialUris.size() == 1) {
317 namespace = potentialUris.iterator().next();
318 } else if (potentialUris.size() > 1) {
319 throw new IllegalStateException("Choose suitable module name for element "+nodeNamePart+":"+toModuleNames(potentialUris));
320 } else if (potentialUris.isEmpty()) {
321 throw new IllegalStateException("Schema node with name "+nodeNamePart+" wasn't found under "+dataSchemaNode.getQName()+".");
325 return new NamespaceAndName(nodeNamePart, namespace);
328 private String toModuleNames(final Set<URI> potentialUris) {
329 final StringBuilder builder = new StringBuilder();
330 for (final URI potentialUri : potentialUris) {
331 builder.append("\n");
332 //FIXME how to get information about revision from JSON input? currently first available is used.
333 builder.append(schema.findModuleByNamespace(potentialUri).iterator().next().getName());
335 return builder.toString();
338 private Set<URI> resolveAllPotentialNamespaces(final String elementName, final DataSchemaNode dataSchemaNode) {
339 final Set<URI> potentialUris = new HashSet<>();
340 final Set<ChoiceSchemaNode> choices = new HashSet<>();
341 if (dataSchemaNode instanceof DataNodeContainer) {
342 for (final DataSchemaNode childSchemaNode : ((DataNodeContainer) dataSchemaNode).getChildNodes()) {
343 if (childSchemaNode instanceof ChoiceSchemaNode) {
344 choices.add((ChoiceSchemaNode)childSchemaNode);
345 } else if (childSchemaNode.getQName().getLocalName().equals(elementName)) {
346 potentialUris.add(childSchemaNode.getQName().getNamespace());
350 for (final ChoiceSchemaNode choiceNode : choices) {
351 for (final ChoiceCaseNode concreteCase : choiceNode.getCases()) {
352 potentialUris.addAll(resolveAllPotentialNamespaces(elementName, concreteCase));
356 return potentialUris;
359 private URI getCurrentNamespace() {
360 return namespaces.peek();
363 private static class NamespaceAndName {
364 private final URI uri;
365 private final String name;
367 public NamespaceAndName(final String name, final URI uri) {
372 public String getName() {
376 public URI getUri() {
382 public void flush() throws IOException {
387 public void close() throws IOException {