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.yangtools.yang.data.codec.xml;
11 import com.google.common.annotations.Beta;
12 import com.google.common.base.Preconditions;
13 import java.io.Closeable;
14 import java.io.Flushable;
15 import java.io.IOException;
16 import java.io.StringReader;
18 import java.net.URISyntaxException;
19 import java.util.Deque;
20 import java.util.HashSet;
22 import javax.annotation.concurrent.NotThreadSafe;
23 import javax.xml.namespace.NamespaceContext;
24 import javax.xml.parsers.ParserConfigurationException;
25 import javax.xml.stream.Location;
26 import javax.xml.stream.XMLStreamConstants;
27 import javax.xml.stream.XMLStreamException;
28 import javax.xml.stream.XMLStreamReader;
29 import javax.xml.transform.dom.DOMSource;
30 import org.opendaylight.yangtools.util.xml.UntrustedXML;
31 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
32 import org.opendaylight.yangtools.yang.data.util.AbstractNodeDataWithSchema;
33 import org.opendaylight.yangtools.yang.data.util.AnyXmlNodeDataWithSchema;
34 import org.opendaylight.yangtools.yang.data.util.CompositeNodeDataWithSchema;
35 import org.opendaylight.yangtools.yang.data.util.ContainerNodeDataWithSchema;
36 import org.opendaylight.yangtools.yang.data.util.LeafListEntryNodeDataWithSchema;
37 import org.opendaylight.yangtools.yang.data.util.LeafListNodeDataWithSchema;
38 import org.opendaylight.yangtools.yang.data.util.LeafNodeDataWithSchema;
39 import org.opendaylight.yangtools.yang.data.util.ListEntryNodeDataWithSchema;
40 import org.opendaylight.yangtools.yang.data.util.ListNodeDataWithSchema;
41 import org.opendaylight.yangtools.yang.data.util.ParserStreamUtils;
42 import org.opendaylight.yangtools.yang.data.util.RpcAsContainer;
43 import org.opendaylight.yangtools.yang.data.util.SimpleNodeDataWithSchema;
44 import org.opendaylight.yangtools.yang.data.util.YangModeledAnyXmlNodeDataWithSchema;
45 import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
46 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
47 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
48 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
49 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
50 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
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.xml.sax.InputSource;
58 import org.xml.sax.SAXException;
61 * This class provides functionality for parsing an XML source containing YANG-modeled data. It disallows multiple
62 * instances of the same element except for leaf-list and list entries. It also expects that the YANG-modeled data in
63 * the XML source are wrapped in a root element.
67 public final class XmlParserStream implements Closeable, Flushable {
68 private final NormalizedNodeStreamWriter writer;
69 private final XmlCodecFactory codecs;
70 private final DataSchemaNode parentNode;
71 private final boolean strictParsing;
73 private XmlParserStream(final NormalizedNodeStreamWriter writer, final XmlCodecFactory codecs,
74 final DataSchemaNode parentNode, final boolean strictParsing) {
75 this.writer = Preconditions.checkNotNull(writer);
76 this.codecs = Preconditions.checkNotNull(codecs);
77 this.parentNode = parentNode;
78 this.strictParsing = strictParsing;
82 * Construct a new {@link XmlParserStream} with strict parsing mode switched on.
84 * @param writer Output writer
85 * @param codecs Shared codecs
86 * @param parentNode Parent root node
87 * @return A new stream instance
89 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final XmlCodecFactory codecs,
90 final SchemaNode parentNode) {
91 return create(writer, codecs, parentNode, true);
95 * Construct a new {@link XmlParserStream}.
97 * @param writer Output writer
98 * @param codecs Shared codecs
99 * @param parentNode Parent root node
100 * @param strictParsing parsing mode
101 * if set to true, the parser will throw an exception if it encounters unknown child nodes
102 * (nodes, that are not defined in the provided SchemaContext) in containers and lists
103 * if set to false, the parser will skip unknown child nodes
104 * @return A new stream instance
106 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final XmlCodecFactory codecs,
107 final SchemaNode parentNode, final boolean strictParsing) {
108 if (parentNode instanceof RpcDefinition) {
109 return new XmlParserStream(writer, codecs, new RpcAsContainer((RpcDefinition) parentNode), strictParsing);
111 Preconditions.checkArgument(parentNode instanceof DataSchemaNode, "Instance of DataSchemaNode class awaited.");
112 return new XmlParserStream(writer, codecs, (DataSchemaNode) parentNode, strictParsing);
116 * Construct a new {@link XmlParserStream}.
118 * @deprecated Use {@link #create(NormalizedNodeStreamWriter, SchemaContext, SchemaNode)} instead.
121 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext) {
122 return create(writer, schemaContext, schemaContext);
126 * Utility method for use when caching {@link XmlCodecFactory} is not feasible. Users with high performance
127 * requirements should use {@link #create(NormalizedNodeStreamWriter, XmlCodecFactory, SchemaNode)} instead and
128 * maintain a {@link XmlCodecFactory} to match the current {@link SchemaContext}.
130 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
131 final SchemaNode parentNode) {
132 return create(writer, schemaContext, parentNode, true);
136 * Utility method for use when caching {@link XmlCodecFactory} is not feasible. Users with high performance
137 * requirements should use {@link #create(NormalizedNodeStreamWriter, XmlCodecFactory, SchemaNode)} instead and
138 * maintain a {@link XmlCodecFactory} to match the current {@link SchemaContext}.
140 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
141 final SchemaNode parentNode, final boolean strictParsing) {
142 return create(writer, XmlCodecFactory.create(schemaContext), parentNode, strictParsing);
146 * This method parses the XML source and emits node events into a NormalizedNodeStreamWriter based on the
147 * YANG-modeled data contained in the XML source.
150 * StAX reader which is to used to walk through the XML source
152 * instance of XmlParserStream
153 * @throws XMLStreamException
154 * if a well-formedness error or an unexpected processing condition occurs while parsing the XML
155 * @throws URISyntaxException
156 * if the namespace URI of an XML element contains a syntax error
157 * @throws IOException
158 * if an error occurs while parsing the value of an anyxml node
159 * @throws ParserConfigurationException
160 * if an error occurs while parsing the value of an anyxml node
161 * @throws SAXException
162 * if an error occurs while parsing the value of an anyxml node
164 public XmlParserStream parse(final XMLStreamReader reader) throws XMLStreamException, URISyntaxException,
165 IOException, ParserConfigurationException, SAXException {
166 if (reader.hasNext()) {
168 final AbstractNodeDataWithSchema nodeDataWithSchema;
169 if (parentNode instanceof ContainerSchemaNode) {
170 nodeDataWithSchema = new ContainerNodeDataWithSchema(parentNode);
171 } else if (parentNode instanceof ListSchemaNode) {
172 nodeDataWithSchema = new ListNodeDataWithSchema(parentNode);
173 } else if (parentNode instanceof YangModeledAnyXmlSchemaNode) {
174 nodeDataWithSchema = new YangModeledAnyXmlNodeDataWithSchema((YangModeledAnyXmlSchemaNode) parentNode);
175 } else if (parentNode instanceof AnyXmlSchemaNode) {
176 nodeDataWithSchema = new AnyXmlNodeDataWithSchema(parentNode);
177 } else if (parentNode instanceof LeafSchemaNode) {
178 nodeDataWithSchema = new LeafNodeDataWithSchema(parentNode);
179 } else if (parentNode instanceof LeafListSchemaNode) {
180 nodeDataWithSchema = new LeafListNodeDataWithSchema(parentNode);
182 throw new IllegalStateException("Unsupported schema node type " + parentNode.getClass() + ".");
185 read(reader, nodeDataWithSchema, reader.getLocalName());
186 nodeDataWithSchema.write(writer);
192 private static String readAnyXmlValue(final XMLStreamReader in) throws XMLStreamException {
193 final StringBuilder sb = new StringBuilder();
194 final String anyXmlElementName = in.getLocalName();
195 sb.append('<').append(anyXmlElementName).append(" xmlns=\"").append(in.getNamespaceURI()).append("\">");
197 while (in.hasNext()) {
198 final int eventType = in.next();
200 if (eventType == XMLStreamConstants.START_ELEMENT) {
201 sb.append('<').append(in.getLocalName()).append('>');
202 } else if (eventType == XMLStreamConstants.END_ELEMENT) {
203 sb.append("</").append(in.getLocalName()).append('>');
205 if (in.getLocalName().equals(anyXmlElementName)) {
209 } else if (eventType == XMLStreamConstants.CHARACTERS) {
210 sb.append(in.getText());
214 return sb.toString();
217 private void read(final XMLStreamReader in, final AbstractNodeDataWithSchema parent, final String rootElement)
218 throws XMLStreamException, URISyntaxException, ParserConfigurationException, SAXException, IOException {
223 if (parent instanceof LeafNodeDataWithSchema || parent instanceof LeafListEntryNodeDataWithSchema) {
224 setValue(parent, in.getElementText().trim(), in.getNamespaceContext());
225 if (isNextEndDocument(in)) {
229 if (!isAtElement(in)) {
235 if (parent instanceof LeafListNodeDataWithSchema || parent instanceof ListNodeDataWithSchema) {
236 String xmlElementName = in.getLocalName();
237 while (xmlElementName.equals(parent.getSchema().getQName().getLocalName())) {
238 read(in, newEntryNode(parent), rootElement);
239 if (in.getEventType() == XMLStreamConstants.END_DOCUMENT) {
242 xmlElementName = in.getLocalName();
248 if (parent instanceof AnyXmlNodeDataWithSchema) {
249 setValue(parent, readAnyXmlValue(in), in.getNamespaceContext());
250 if (isNextEndDocument(in)) {
254 if (!isAtElement(in)) {
261 switch (in.nextTag()) {
262 case XMLStreamConstants.START_ELEMENT:
263 final Set<String> namesakes = new HashSet<>();
264 while (in.hasNext()) {
265 final String xmlElementName = in.getLocalName();
267 DataSchemaNode parentSchema = parent.getSchema();
269 final String parentSchemaName = parentSchema.getQName().getLocalName();
270 if (parentSchemaName.equals(xmlElementName)
271 && in.getEventType() == XMLStreamConstants.END_ELEMENT) {
272 if (isNextEndDocument(in)) {
276 if (!isAtElement(in)) {
282 if (in.isEndElement() && rootElement.equals(xmlElementName)) {
286 if (parentSchema instanceof YangModeledAnyXmlSchemaNode) {
287 parentSchema = ((YangModeledAnyXmlSchemaNode) parentSchema).getSchemaOfAnyXmlData();
290 if (!namesakes.add(xmlElementName)) {
291 final Location loc = in.getLocation();
292 throw new IllegalStateException(String.format(
293 "Duplicate element \"%s\" in XML input at: line %s column %s", xmlElementName,
294 loc.getLineNumber(), loc.getColumnNumber()));
297 final String xmlElementNamespace = in.getNamespaceURI();
298 final Deque<DataSchemaNode> childDataSchemaNodes =
299 ParserStreamUtils.findSchemaNodeByNameAndNamespace(parentSchema, xmlElementName,
300 new URI(xmlElementNamespace));
302 if (childDataSchemaNodes.isEmpty()) {
303 Preconditions.checkState(!strictParsing,
304 "Schema for node with name %s and namespace %s doesn't exist.", xmlElementName,
305 xmlElementNamespace);
310 read(in, ((CompositeNodeDataWithSchema) parent).addChild(childDataSchemaNodes), rootElement);
313 case XMLStreamConstants.END_ELEMENT:
314 if (isNextEndDocument(in)) {
318 if (!isAtElement(in)) {
327 private static boolean isNextEndDocument(final XMLStreamReader in) throws XMLStreamException {
328 return in.next() == XMLStreamConstants.END_DOCUMENT;
331 private static boolean isAtElement(final XMLStreamReader in) {
332 return in.getEventType() == XMLStreamConstants.START_ELEMENT
333 || in.getEventType() == XMLStreamConstants.END_ELEMENT;
336 private static void skipUnknownNode(final XMLStreamReader in) throws XMLStreamException {
337 // in case when the unknown node and at least one of its descendant nodes have the same name
338 // we cannot properly reach the end just by checking if the current node is an end element and has the same name
339 // as the root unknown element. therefore we ignore the names completely and just track the level of nesting
340 int levelOfNesting = 0;
341 while (in.hasNext()) {
342 // in case there are text characters in an element, we cannot skip them by calling nextTag()
343 // therefore we skip them by calling next(), and then proceed to next element
345 if (!isAtElement(in)) {
348 if (in.isStartElement()) {
352 if (in.isEndElement()) {
353 if (levelOfNesting == 0) {
364 private void setValue(final AbstractNodeDataWithSchema parent, final String value, final NamespaceContext nsContext)
365 throws ParserConfigurationException, SAXException, IOException {
366 Preconditions.checkArgument(parent instanceof SimpleNodeDataWithSchema, "Node %s is not a simple type",
367 parent.getSchema().getQName());
368 final SimpleNodeDataWithSchema parentSimpleNode = (SimpleNodeDataWithSchema) parent;
369 Preconditions.checkArgument(parentSimpleNode.getValue() == null, "Node '%s' has already set its value to '%s'",
370 parentSimpleNode.getSchema().getQName(), parentSimpleNode.getValue());
372 parentSimpleNode.setValue(translateValueByType(value, parentSimpleNode.getSchema(), nsContext));
375 private Object translateValueByType(final String value, final DataSchemaNode node,
376 final NamespaceContext namespaceCtx) throws IOException, SAXException, ParserConfigurationException {
377 if (node instanceof AnyXmlSchemaNode) {
379 * FIXME: Figure out some YANG extension dispatch, which will
380 * reuse JSON parsing or XML parsing - anyxml is not well-defined in
383 final Document doc = UntrustedXML.newDocumentBuilder().parse(new InputSource(new StringReader(value)));
386 return new DOMSource(doc.getDocumentElement());
389 Preconditions.checkArgument(node instanceof TypedSchemaNode);
390 return codecs.codecFor((TypedSchemaNode) node).parseValue(namespaceCtx, value);
393 private static AbstractNodeDataWithSchema newEntryNode(final AbstractNodeDataWithSchema parent) {
394 final AbstractNodeDataWithSchema newChild;
395 if (parent instanceof ListNodeDataWithSchema) {
396 newChild = new ListEntryNodeDataWithSchema(parent.getSchema());
398 newChild = new LeafListEntryNodeDataWithSchema(parent.getSchema());
400 ((CompositeNodeDataWithSchema) parent).addChild(newChild);
405 public void close() throws IOException {
411 public void flush() throws IOException {