2 * Copyright (c) 2013 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.netconf.common.mdsal;
10 import java.io.IOException;
11 import java.net.URISyntaxException;
12 import java.util.Iterator;
13 import java.util.List;
15 import java.util.Map.Entry;
16 import java.util.stream.Collectors;
17 import javax.xml.stream.XMLOutputFactory;
18 import javax.xml.stream.XMLStreamException;
19 import javax.xml.stream.XMLStreamWriter;
20 import javax.xml.transform.dom.DOMResult;
21 import javax.xml.transform.dom.DOMSource;
22 import org.eclipse.jdt.annotation.Nullable;
23 import org.opendaylight.netconf.api.xml.XmlUtil;
24 import org.opendaylight.yangtools.rfc7952.data.api.NormalizedMetadata;
25 import org.opendaylight.yangtools.rfc7952.data.api.StreamWriterMetadataExtension;
26 import org.opendaylight.yangtools.rfc7952.data.util.NormalizedMetadataWriter;
27 import org.opendaylight.yangtools.rfc8528.data.api.MountPointContext;
28 import org.opendaylight.yangtools.rfc8528.data.util.EmptyMountPointContext;
29 import org.opendaylight.yangtools.yang.common.QName;
30 import org.opendaylight.yangtools.yang.common.QNameModule;
31 import org.opendaylight.yangtools.yang.common.Revision;
32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
35 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
36 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
37 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
38 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
39 import org.opendaylight.yangtools.yang.data.codec.xml.XmlParserStream;
40 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
41 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
42 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
43 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
44 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
45 import org.slf4j.Logger;
46 import org.slf4j.LoggerFactory;
47 import org.w3c.dom.Element;
48 import org.xml.sax.SAXException;
51 * Utility methods to work with {@link NormalizedNode} and related constructs in the context of NETCONF protocol.
53 public final class NormalizedDataUtil {
55 * Shim interface to handle differences around namespace handling between various XMLStreamWriter implementations.
58 * <li>OpenJDK DOM writer (com.sun.xml.internal.stream.writers.XMLDOMWriterImpl) throws
59 * UnsupportedOperationException from its setNamespaceContext() method</li>
60 * <li>Woodstox DOM writer (com.ctc.wstx.dom.WstxDOMWrappingWriter) works with namespace context, but treats
61 * setPrefix() calls as hints -- which are not discoverable.</li>
65 * Due to this we perform a quick test for behavior and decide the appropriate strategy.
68 private interface NamespaceSetter {
69 void initializeNamespace(XMLStreamWriter writer) throws XMLStreamException;
71 static NamespaceSetter forFactory(final XMLOutputFactory xmlFactory) {
72 final String netconfNamespace = NETCONF_QNAME.getNamespace().toString();
73 final AnyXmlNamespaceContext namespaceContext = new AnyXmlNamespaceContext(Map.of("op", netconfNamespace));
76 final XMLStreamWriter testWriter = xmlFactory.createXMLStreamWriter(new DOMResult(
77 XmlUtil.newDocument()));
78 testWriter.setNamespaceContext(namespaceContext);
79 } catch (final UnsupportedOperationException e) {
80 // This happens with JDK's DOM writer, which we may be using
81 LOG.debug("Unable to set namespace context, falling back to setPrefix()", e);
82 return writer -> writer.setPrefix("op", netconfNamespace);
83 } catch (XMLStreamException e) {
84 throw new ExceptionInInitializerError(e);
87 // Success, we can use setNamespaceContext()
88 return writer -> writer.setNamespaceContext(namespaceContext);
92 private static final Logger LOG = LoggerFactory.getLogger(NormalizedDataUtil.class);
94 // FIXME: document what exactly this QName means, as it is not referring to a tangible node nor the ietf-module.
95 // FIXME: what is this contract saying?
96 // - is it saying all data is going to be interpreted with this root?
97 // - is this saying we are following a specific interface contract (i.e. do we have schema mounts?)
98 // - is it also inferring some abilities w.r.t. RFC8342?
99 public static final QName NETCONF_QNAME = QName.create(QNameModule.create(SchemaContext.NAME.getNamespace(),
100 Revision.of("2011-06-01")), "netconf").intern();
101 // FIXME: is this the device-bound revision?
102 public static final QName NETCONF_DATA_QNAME = QName.create(NETCONF_QNAME, "data").intern();
104 public static final XMLOutputFactory XML_FACTORY;
107 final XMLOutputFactory f = XMLOutputFactory.newFactory();
108 // FIXME: not repairing namespaces is probably common, this should be availabe as common XML constant.
109 f.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, false);
113 private static final NamespaceSetter XML_NAMESPACE_SETTER = NamespaceSetter.forFactory(XML_FACTORY);
115 private NormalizedDataUtil() {
120 * Write {@code normalized} data into {@link DOMResult}.
122 * @param normalized data to be written
123 * @param result DOM result holder
124 * @param context mountpoint schema context
125 * @param path optional schema node identifier of the parent node
126 * @throws IOException when failed to write data into {@link NormalizedNodeStreamWriter}
127 * @throws XMLStreamException when failed to serialize data into XML document
129 public static void writeNormalizedNode(final NormalizedNode normalized, final DOMResult result,
130 final EffectiveModelContext context, final @Nullable Absolute path) throws IOException, XMLStreamException {
131 final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
132 try (var streamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, path);
133 var writer = NormalizedNodeWriter.forStreamWriter(streamWriter)) {
134 writer.write(normalized);
142 * Write {@code normalized} data along with corresponding {@code metadata} into {@link DOMResult}.
144 * @param normalized data to be written
145 * @param metadata metadata to be written
146 * @param result DOM result holder
147 * @param context mountpoint schema context
148 * @param path optional schema node identifier of the parent node
149 * @throws IOException when failed to write data into {@link NormalizedNodeStreamWriter}
150 * @throws XMLStreamException when failed to serialize data into XML document
152 public static void writeNormalizedNode(final NormalizedNode normalized, final @Nullable NormalizedMetadata metadata,
153 final DOMResult result, final EffectiveModelContext context, final @Nullable Absolute path)
154 throws IOException, XMLStreamException {
155 if (metadata == null) {
156 writeNormalizedNode(normalized, result, context, path);
160 final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
161 XML_NAMESPACE_SETTER.initializeNamespace(xmlWriter);
162 try (var streamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, path);
163 var writer = NormalizedMetadataWriter.forStreamWriter(streamWriter)) {
164 writer.write(normalized, metadata);
172 * Write data specified by {@link YangInstanceIdentifier} into {@link DOMResult}.
174 * @param query path to the root node
175 * @param result DOM result holder
176 * @param context mountpoint schema context
177 * @param path optional schema node identifier of the parent node
178 * @throws IOException when failed to write data into {@link NormalizedNodeStreamWriter}
179 * @throws XMLStreamException when failed to serialize data into XML document
181 public static void writeNormalizedNode(final YangInstanceIdentifier query, final DOMResult result,
182 final EffectiveModelContext context, final @Nullable Absolute path) throws IOException, XMLStreamException {
183 final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
184 XML_NAMESPACE_SETTER.initializeNamespace(xmlWriter);
185 try (var streamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, path);
186 var writer = new EmptyListXmlWriter(streamWriter, xmlWriter)) {
187 final Iterator<PathArgument> it = query.getPathArguments().iterator();
188 final PathArgument first = it.next();
189 StreamingContext.fromSchemaAndQNameChecked(context, first.getNodeType()).streamToWriter(writer, first, it);
196 * Write data specified by {@link YangInstanceIdentifier} along with corresponding {@code metadata}
197 * into {@link DOMResult}.
199 * @param query path to the root node
200 * @param metadata metadata to be written
201 * @param result DOM result holder
202 * @param context mountpoint schema context
203 * @param path optional schema node identifier of the parent node
204 * @throws IOException when failed to write data into {@link NormalizedNodeStreamWriter}
205 * @throws XMLStreamException when failed to serialize data into XML document
207 public static void writeNormalizedNode(final YangInstanceIdentifier query,
208 final @Nullable NormalizedMetadata metadata, final DOMResult result, final EffectiveModelContext context,
209 final @Nullable Absolute path) throws IOException, XMLStreamException {
210 if (metadata == null) {
211 writeNormalizedNode(query, result, context, path);
215 final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
216 XML_NAMESPACE_SETTER.initializeNamespace(xmlWriter);
217 try (var streamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, path);
218 var writer = new EmptyListXmlMetadataWriter(streamWriter, xmlWriter,
219 streamWriter.getExtensions().getInstance(StreamWriterMetadataExtension.class), metadata)) {
220 final Iterator<PathArgument> it = query.getPathArguments().iterator();
221 final PathArgument first = it.next();
222 StreamingContext.fromSchemaAndQNameChecked(context, first.getNodeType()).streamToWriter(writer, first, it);
229 * Writing subtree filter specified by {@link YangInstanceIdentifier} into {@link DOMResult}.
231 * @param query path to the root node
232 * @param result DOM result holder
233 * @param context mountpoint schema context
234 * @param path optional schema node identifier of the parent node
235 * @throws IOException failed to write filter into {@link NormalizedNodeStreamWriter}
236 * @throws XMLStreamException failed to serialize filter into XML document
238 public static void writeFilter(final YangInstanceIdentifier query, final DOMResult result,
239 final EffectiveModelContext context, final @Nullable Absolute path) throws IOException, XMLStreamException {
240 if (query.isEmpty()) {
245 final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
246 try (var streamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, path);
247 var writer = new EmptyListXmlWriter(streamWriter, xmlWriter)) {
248 final Iterator<PathArgument> it = query.getPathArguments().iterator();
249 final PathArgument first = it.next();
250 StreamingContext.fromSchemaAndQNameChecked(context, first.getNodeType()).streamToWriter(writer, first, it);
257 * Writing subtree filter specified by parent {@link YangInstanceIdentifier} and specific fields
258 * into {@link DOMResult}. Field paths are relative to parent query path.
260 * @param query path to the root node
261 * @param result DOM result holder
262 * @param context mountpoint schema context
263 * @param path optional schema node identifier of the parent node
264 * @param fields list of specific fields for which the filter should be created
265 * @throws IOException failed to write filter into {@link NormalizedNodeStreamWriter}
266 * @throws XMLStreamException failed to serialize filter into XML document
267 * @throws NullPointerException if any argument is null
269 public static void writeFilter(final YangInstanceIdentifier query, final DOMResult result,
270 final EffectiveModelContext context, final @Nullable Absolute path,
271 final List<YangInstanceIdentifier> fields) throws IOException, XMLStreamException {
272 if (query.isEmpty() || fields.isEmpty()) {
277 final List<YangInstanceIdentifier> aggregatedFields = aggregateFields(fields);
278 final PathNode rootNode = constructPathArgumentTree(query, aggregatedFields);
280 final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
282 try (var streamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, path);
283 var writer = new EmptyListXmlWriter(streamWriter, xmlWriter)) {
284 final PathArgument first = rootNode.element();
285 StreamingContext.fromSchemaAndQNameChecked(context, first.getNodeType())
286 .streamToWriter(writer, first, rootNode);
294 * Writing subtree filter specified by parent {@link YangInstanceIdentifier} and specific fields
295 * into {@link Element}. Field paths are relative to parent query path. Filter is created without following
296 * {@link EffectiveModelContext}.
298 * @param query path to the root node
299 * @param fields list of specific fields for which the filter should be created
300 * @param filterElement XML filter element to which the created filter will be written
302 public static void writeSchemalessFilter(final YangInstanceIdentifier query,
303 final List<YangInstanceIdentifier> fields, final Element filterElement) {
304 pathArgumentTreeToXmlStructure(constructPathArgumentTree(query, aggregateFields(fields)), filterElement);
307 private static void pathArgumentTreeToXmlStructure(final PathNode pathArgumentTree, final Element data) {
308 final PathArgument pathArg = pathArgumentTree.element();
310 final QName nodeType = pathArg.getNodeType();
311 final String elementNamespace = nodeType.getNamespace().toString();
313 if (data.getElementsByTagNameNS(elementNamespace, nodeType.getLocalName()).getLength() != 0) {
314 // element has already been written as list key
318 final Element childElement = data.getOwnerDocument().createElementNS(elementNamespace, nodeType.getLocalName());
319 data.appendChild(childElement);
320 if (pathArg instanceof NodeIdentifierWithPredicates nip) {
321 appendListKeyNodes(childElement, nip);
323 for (final PathNode childrenNode : pathArgumentTree.children()) {
324 pathArgumentTreeToXmlStructure(childrenNode, childElement);
329 * Appending list key elements to parent element.
331 * @param parentElement parent XML element to which children elements are appended
332 * @param listEntryId list entry identifier
334 public static void appendListKeyNodes(final Element parentElement, final NodeIdentifierWithPredicates listEntryId) {
335 for (Entry<QName, Object> key : listEntryId.entrySet()) {
336 final Element keyElement = parentElement.getOwnerDocument().createElementNS(
337 key.getKey().getNamespace().toString(), key.getKey().getLocalName());
338 keyElement.setTextContent(key.getValue().toString());
339 parentElement.appendChild(keyElement);
344 * Aggregation of the fields paths based on parenthesis. Only parent/enclosing {@link YangInstanceIdentifier}
345 * are kept. For example, paths '/x/y/z', '/x/y', and '/x' are aggregated into single field path: '/x'
347 * @param fields paths of fields
348 * @return filtered {@link List} of paths
350 private static List<YangInstanceIdentifier> aggregateFields(final List<YangInstanceIdentifier> fields) {
351 return fields.stream()
352 .filter(field -> fields.stream()
353 .filter(fieldYiid -> !field.equals(fieldYiid))
354 .noneMatch(fieldYiid -> fieldYiid.contains(field)))
355 .collect(Collectors.toList());
359 * Construct a tree based on the parent {@link YangInstanceIdentifier} and provided list of fields. The goal of this
360 * procedure is the elimination of the redundancy that is introduced by potentially overlapping parts of the fields
363 * @param query path to parent element
364 * @param fields subpaths relative to parent path that identify specific fields
365 * @return created {@link PathNode} structure
367 private static PathNode constructPathArgumentTree(final YangInstanceIdentifier query,
368 final List<YangInstanceIdentifier> fields) {
369 final Iterator<PathArgument> queryIterator = query.getPathArguments().iterator();
370 final PathNode rootTreeNode = new PathNode(queryIterator.next());
372 PathNode queryTreeNode = rootTreeNode;
373 while (queryIterator.hasNext()) {
374 queryTreeNode = queryTreeNode.ensureChild(queryIterator.next());
377 for (final YangInstanceIdentifier field : fields) {
378 PathNode actualFieldTreeNode = queryTreeNode;
379 for (final PathArgument fieldPathArg : field.getPathArguments()) {
380 actualFieldTreeNode = actualFieldTreeNode.ensureChild(fieldPathArg);
386 public static NormalizedNodeResult transformDOMSourceToNormalizedNode(final MountPointContext mount,
387 final DOMSource value) throws XMLStreamException, URISyntaxException, IOException, SAXException {
388 final NormalizedNodeResult resultHolder = new NormalizedNodeResult();
389 final NormalizedNodeStreamWriter writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
390 try (XmlParserStream xmlParserStream = XmlParserStream.create(writer, new ProxyMountPointContext(mount))) {
391 xmlParserStream.traverse(value);
396 // FIXME: document this interface contract. Does it support RFC8528/RFC8542? How?
397 public static NormalizedNodeResult transformDOMSourceToNormalizedNode(final EffectiveModelContext schemaContext,
398 final DOMSource value) throws XMLStreamException, URISyntaxException, IOException, SAXException {
399 return transformDOMSourceToNormalizedNode(new EmptyMountPointContext(schemaContext), value);