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 static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Preconditions.checkState;
12 import static java.util.Objects.requireNonNull;
14 import com.google.common.annotations.Beta;
15 import com.google.gson.JsonIOException;
16 import com.google.gson.JsonParseException;
17 import com.google.gson.JsonSyntaxException;
18 import com.google.gson.stream.JsonReader;
19 import com.google.gson.stream.MalformedJsonException;
20 import java.io.Closeable;
21 import java.io.EOFException;
22 import java.io.Flushable;
23 import java.io.IOException;
25 import java.util.AbstractMap.SimpleImmutableEntry;
26 import java.util.ArrayDeque;
27 import java.util.Collections;
28 import java.util.Deque;
29 import java.util.HashSet;
30 import java.util.Map.Entry;
32 import javax.xml.transform.dom.DOMSource;
33 import org.opendaylight.yangtools.util.xml.UntrustedXML;
34 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
35 import org.opendaylight.yangtools.yang.data.util.AbstractNodeDataWithSchema;
36 import org.opendaylight.yangtools.yang.data.util.AnyXmlNodeDataWithSchema;
37 import org.opendaylight.yangtools.yang.data.util.CompositeNodeDataWithSchema;
38 import org.opendaylight.yangtools.yang.data.util.LeafListEntryNodeDataWithSchema;
39 import org.opendaylight.yangtools.yang.data.util.LeafListNodeDataWithSchema;
40 import org.opendaylight.yangtools.yang.data.util.LeafNodeDataWithSchema;
41 import org.opendaylight.yangtools.yang.data.util.ListEntryNodeDataWithSchema;
42 import org.opendaylight.yangtools.yang.data.util.ListNodeDataWithSchema;
43 import org.opendaylight.yangtools.yang.data.util.ParserStreamUtils;
44 import org.opendaylight.yangtools.yang.data.util.RpcAsContainer;
45 import org.opendaylight.yangtools.yang.data.util.SimpleNodeDataWithSchema;
46 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
47 import org.opendaylight.yangtools.yang.model.api.ChoiceSchemaNode;
48 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
49 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
50 import org.opendaylight.yangtools.yang.model.api.Module;
51 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
52 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
53 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
54 import org.opendaylight.yangtools.yang.model.api.TypedSchemaNode;
55 import org.opendaylight.yangtools.yang.model.api.YangModeledAnyXmlSchemaNode;
56 import org.w3c.dom.Document;
57 import org.w3c.dom.Element;
58 import org.w3c.dom.Text;
61 * This class parses JSON elements from a GSON JsonReader. It disallows multiple elements of the same name unlike the
62 * default GSON JsonParser.
65 public final class JsonParserStream implements Closeable, Flushable {
66 static final String ANYXML_ARRAY_ELEMENT_ID = "array-element";
68 private final Deque<URI> namespaces = new ArrayDeque<>();
69 private final NormalizedNodeStreamWriter writer;
70 private final JSONCodecFactory codecs;
71 private final SchemaContext schema;
72 private final DataSchemaNode parentNode;
74 private JsonParserStream(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
75 final JSONCodecFactory codecs, final DataSchemaNode parentNode) {
76 this.schema = requireNonNull(schemaContext);
77 this.writer = requireNonNull(writer);
78 this.codecs = requireNonNull(codecs);
79 this.parentNode = parentNode;
82 private JsonParserStream(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
83 final DataSchemaNode parentNode) {
84 this(writer, schemaContext, JSONCodecFactory.getShared(schemaContext), parentNode);
87 public static JsonParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
88 final SchemaNode parentNode) {
89 if (parentNode instanceof RpcDefinition) {
90 return new JsonParserStream(writer, schemaContext, new RpcAsContainer((RpcDefinition) parentNode));
92 checkArgument(parentNode instanceof DataSchemaNode, "Instance of DataSchemaNode class awaited.");
93 return new JsonParserStream(writer, schemaContext, (DataSchemaNode) parentNode);
96 public static JsonParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext) {
97 return new JsonParserStream(writer, schemaContext, schemaContext);
100 public JsonParserStream parse(final JsonReader reader) {
101 // code copied from gson's JsonParser and Stream classes
103 final boolean lenient = reader.isLenient();
104 reader.setLenient(true);
105 boolean isEmpty = true;
109 final CompositeNodeDataWithSchema compositeNodeDataWithSchema = new CompositeNodeDataWithSchema(parentNode);
110 read(reader, compositeNodeDataWithSchema);
111 compositeNodeDataWithSchema.write(writer);
114 } catch (final EOFException e) {
118 // The stream ended prematurely so it is likely a syntax error.
119 throw new JsonSyntaxException(e);
120 } catch (final MalformedJsonException | NumberFormatException e) {
121 throw new JsonSyntaxException(e);
122 } catch (final IOException e) {
123 throw new JsonIOException(e);
124 } catch (StackOverflowError | OutOfMemoryError e) {
125 throw new JsonParseException("Failed parsing JSON source: " + reader + " to Json", e);
127 reader.setLenient(lenient);
131 private void traverseAnyXmlValue(final JsonReader in, final Document doc, final Element parentElement)
136 Text textNode = doc.createTextNode(in.nextString());
137 parentElement.appendChild(textNode);
140 textNode = doc.createTextNode(Boolean.toString(in.nextBoolean()));
141 parentElement.appendChild(textNode);
145 textNode = doc.createTextNode("null");
146 parentElement.appendChild(textNode);
150 while (in.hasNext()) {
151 final Element childElement = doc.createElement(ANYXML_ARRAY_ELEMENT_ID);
152 parentElement.appendChild(childElement);
153 traverseAnyXmlValue(in, doc, childElement);
159 while (in.hasNext()) {
160 final Element childElement = doc.createElement(in.nextName());
161 parentElement.appendChild(childElement);
162 traverseAnyXmlValue(in, doc, childElement);
171 private void readAnyXmlValue(final JsonReader in, final AnyXmlNodeDataWithSchema parent,
172 final String anyXmlObjectName) throws IOException {
173 final String anyXmlObjectNS = getCurrentNamespace().toString();
174 final Document doc = UntrustedXML.newDocumentBuilder().newDocument();
175 final Element rootElement = doc.createElementNS(anyXmlObjectNS, anyXmlObjectName);
176 doc.appendChild(rootElement);
177 traverseAnyXmlValue(in, doc, rootElement);
179 final DOMSource domSource = new DOMSource(doc.getDocumentElement());
180 parent.setValue(domSource);
183 public void read(final JsonReader in, AbstractNodeDataWithSchema parent) throws IOException {
187 setValue(parent, in.nextString());
190 setValue(parent, Boolean.toString(in.nextBoolean()));
194 setValue(parent, null);
198 while (in.hasNext()) {
199 if (parent instanceof LeafNodeDataWithSchema) {
202 final AbstractNodeDataWithSchema newChild = newArrayEntry(parent);
209 final Set<String> namesakes = new HashSet<>();
212 * This allows parsing of incorrectly /as showcased/
213 * in testconf nesting of list items - eg.
214 * lists with one value are sometimes serialized
215 * without wrapping array.
218 if (isArray(parent)) {
219 parent = newArrayEntry(parent);
221 while (in.hasNext()) {
222 final String jsonElementName = in.nextName();
223 DataSchemaNode parentSchema = parent.getSchema();
224 if (parentSchema instanceof YangModeledAnyXmlSchemaNode) {
225 parentSchema = ((YangModeledAnyXmlSchemaNode) parentSchema).getSchemaOfAnyXmlData();
227 final Entry<String, URI> namespaceAndName = resolveNamespace(jsonElementName, parentSchema);
228 final String localName = namespaceAndName.getKey();
229 addNamespace(namespaceAndName.getValue());
230 if (!namesakes.add(jsonElementName)) {
231 throw new JsonSyntaxException("Duplicate name " + jsonElementName + " in JSON input.");
234 final Deque<DataSchemaNode> childDataSchemaNodes =
235 ParserStreamUtils.findSchemaNodeByNameAndNamespace(parentSchema, localName,
236 getCurrentNamespace());
237 checkState(!childDataSchemaNodes.isEmpty(),
238 "Schema for node with name %s and namespace %s does not exist.", localName,
239 getCurrentNamespace());
241 final AbstractNodeDataWithSchema newChild = ((CompositeNodeDataWithSchema) parent)
242 .addChild(childDataSchemaNodes);
243 if (newChild instanceof AnyXmlNodeDataWithSchema) {
244 readAnyXmlValue(in, (AnyXmlNodeDataWithSchema) newChild, jsonElementName);
257 private static boolean isArray(final AbstractNodeDataWithSchema parent) {
258 return parent instanceof ListNodeDataWithSchema || parent instanceof LeafListNodeDataWithSchema;
261 private static AbstractNodeDataWithSchema newArrayEntry(final AbstractNodeDataWithSchema parent) {
262 AbstractNodeDataWithSchema newChild;
263 if (parent instanceof ListNodeDataWithSchema) {
264 newChild = new ListEntryNodeDataWithSchema(parent.getSchema());
265 } else if (parent instanceof LeafListNodeDataWithSchema) {
266 newChild = new LeafListEntryNodeDataWithSchema(parent.getSchema());
268 throw new IllegalStateException("Found an unexpected array nested under " + parent.getSchema().getQName());
270 ((CompositeNodeDataWithSchema) parent).addChild(newChild);
274 private void setValue(final AbstractNodeDataWithSchema parent, final String value) {
275 checkArgument(parent instanceof SimpleNodeDataWithSchema, "Node %s is not a simple type",
276 parent.getSchema().getQName());
277 final SimpleNodeDataWithSchema parentSimpleNode = (SimpleNodeDataWithSchema) parent;
278 checkArgument(parentSimpleNode.getValue() == null, "Node '%s' has already set its value to '%s'",
279 parentSimpleNode.getSchema().getQName(), parentSimpleNode.getValue());
281 final Object translatedValue = translateValueByType(value, parentSimpleNode.getSchema());
282 parentSimpleNode.setValue(translatedValue);
285 private Object translateValueByType(final String value, final DataSchemaNode node) {
286 checkArgument(node instanceof TypedSchemaNode);
287 return codecs.codecFor((TypedSchemaNode) node).parseValue(null, value);
290 private void removeNamespace() {
294 private void addNamespace(final URI namespace) {
295 namespaces.push(namespace);
298 private Entry<String, URI> resolveNamespace(final String childName, final DataSchemaNode dataSchemaNode) {
299 final int lastIndexOfColon = childName.lastIndexOf(':');
300 String moduleNamePart = null;
301 String nodeNamePart = null;
302 URI namespace = null;
303 if (lastIndexOfColon != -1) {
304 moduleNamePart = childName.substring(0, lastIndexOfColon);
305 nodeNamePart = childName.substring(lastIndexOfColon + 1);
307 final Module m = schema.findModuleByName(moduleNamePart, null);
308 namespace = m == null ? null : m.getNamespace();
310 nodeNamePart = childName;
313 if (namespace == null) {
314 Set<URI> potentialUris = Collections.emptySet();
315 potentialUris = resolveAllPotentialNamespaces(nodeNamePart, dataSchemaNode);
316 if (potentialUris.contains(getCurrentNamespace())) {
317 namespace = getCurrentNamespace();
318 } else if (potentialUris.size() == 1) {
319 namespace = potentialUris.iterator().next();
320 } else if (potentialUris.size() > 1) {
321 throw new IllegalStateException("Choose suitable module name for element " + nodeNamePart + ":"
322 + toModuleNames(potentialUris));
323 } else if (potentialUris.isEmpty()) {
324 throw new IllegalStateException("Schema node with name " + nodeNamePart + " was not found under "
325 + dataSchemaNode.getQName() + ".");
329 return new SimpleImmutableEntry<>(nodeNamePart, namespace);
332 private String toModuleNames(final Set<URI> potentialUris) {
333 final StringBuilder builder = new StringBuilder();
334 for (final URI potentialUri : potentialUris) {
335 builder.append('\n');
336 //FIXME how to get information about revision from JSON input? currently first available is used.
337 builder.append(schema.findModuleByNamespace(potentialUri).iterator().next().getName());
339 return builder.toString();
342 private Set<URI> resolveAllPotentialNamespaces(final String elementName, final DataSchemaNode dataSchemaNode) {
343 final Set<URI> potentialUris = new HashSet<>();
344 final Set<ChoiceSchemaNode> choices = new HashSet<>();
345 if (dataSchemaNode instanceof DataNodeContainer) {
346 for (final DataSchemaNode childSchemaNode : ((DataNodeContainer) dataSchemaNode).getChildNodes()) {
347 if (childSchemaNode instanceof ChoiceSchemaNode) {
348 choices.add((ChoiceSchemaNode)childSchemaNode);
349 } else if (childSchemaNode.getQName().getLocalName().equals(elementName)) {
350 potentialUris.add(childSchemaNode.getQName().getNamespace());
354 for (final ChoiceSchemaNode choiceNode : choices) {
355 for (final ChoiceCaseNode concreteCase : choiceNode.getCases()) {
356 potentialUris.addAll(resolveAllPotentialNamespaces(elementName, concreteCase));
360 return potentialUris;
363 private URI getCurrentNamespace() {
364 return namespaces.peek();
368 public void flush() throws IOException {
373 public void close() throws IOException {