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.xml;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.collect.ImmutableMap;
13 import java.io.IOException;
14 import java.util.List;
15 import java.util.Map.Entry;
17 import java.util.concurrent.ConcurrentHashMap;
18 import javax.xml.stream.XMLStreamException;
19 import javax.xml.stream.XMLStreamWriter;
20 import javax.xml.transform.dom.DOMSource;
21 import org.eclipse.jdt.annotation.NonNull;
22 import org.eclipse.jdt.annotation.Nullable;
23 import org.opendaylight.yangtools.yang.common.QName;
24 import org.opendaylight.yangtools.yang.common.YangConstants;
25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
29 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedAnydata;
30 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
31 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter.MetadataExtension;
32 import org.opendaylight.yangtools.yang.data.util.NormalizedNodeStreamWriterStack;
33 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
34 import org.opendaylight.yangtools.yang.model.api.EffectiveStatementInference;
35 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
38 import org.w3c.dom.Node;
41 * A {@link NormalizedNodeStreamWriter} which translates the events into an {@link XMLStreamWriter}, resulting in an
42 * RFC6020 XML encoding. There are 2 versions of this class, one that takes a SchemaContext and encodes values
43 * appropriately according to the YANG schema. The other is schema-less and merely outputs values using toString. The
44 * latter is intended for debugging where doesn't have a SchemaContext available and isn't meant for production use.
47 * Due to backwards compatibility reasons this writer recognizes RFC7952 metadata include keys QNames with empty URI
48 * (as exposed via {@link XmlParserStream#LEGACY_ATTRIBUTE_NAMESPACE}) as their QNameModule. These indicate an
49 * unqualified XML attribute and their value can be assumed to be a String. Furthermore, this extends to qualified
50 * attributes, which uses the proper namespace, but will not bind to a proper module revision. This caveat will be
51 * removed in a future version.
53 public abstract sealed class XMLStreamNormalizedNodeStreamWriter<T>
54 implements NormalizedNodeStreamWriter, MetadataExtension
55 permits SchemaAwareXMLStreamNormalizedNodeStreamWriter, SchemalessXMLStreamNormalizedNodeStreamWriter {
56 private static final Logger LOG = LoggerFactory.getLogger(XMLStreamNormalizedNodeStreamWriter.class);
57 private static final Set<String> BROKEN_ATTRIBUTES = ConcurrentHashMap.newKeySet();
59 private final @NonNull StreamWriterFacade facade;
61 XMLStreamNormalizedNodeStreamWriter(final PreferredPrefixes pref, final XMLStreamWriter writer) {
62 facade = new StreamWriterFacade(pref, writer);
66 * Create a new writer with the specified context as its root.
68 * @param writer Output {@link XMLStreamWriter}
69 * @param context Associated {@link EffectiveModelContext}.
70 * @return A new {@link NormalizedNodeStreamWriter}
72 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
73 final EffectiveModelContext context) {
74 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
75 NormalizedNodeStreamWriterStack.of(context));
79 * Create a new writer with the specified context and rooted at the specified node.
81 * @param writer Output {@link XMLStreamWriter}
82 * @param inference root node inference
83 * @return A new {@link NormalizedNodeStreamWriter}
85 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
86 final EffectiveStatementInference inference) {
87 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, inference.getEffectiveModelContext(),
88 NormalizedNodeStreamWriterStack.of(inference));
92 * Create a new writer with the specified context and rooted in the specified schema path.
94 * @param writer Output {@link XMLStreamWriter}
95 * @param context Associated {@link EffectiveModelContext}.
97 * @return A new {@link NormalizedNodeStreamWriter}
99 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
100 final EffectiveModelContext context, final @Nullable Absolute path) {
101 return path == null ? create(writer, context)
102 : new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
103 NormalizedNodeStreamWriterStack.of(context, path));
107 * Create a new writer with the specified context and rooted in the specified {@link YangInstanceIdentifier}.
109 * @param writer Output {@link XMLStreamWriter}
110 * @param context Associated {@link EffectiveModelContext}.
112 * @return A new {@link NormalizedNodeStreamWriter}
114 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
115 final EffectiveModelContext context, final YangInstanceIdentifier path) {
116 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
117 NormalizedNodeStreamWriterStack.of(context, path));
121 * Create a new writer with the specified context and rooted in the specified operation's input.
123 * @param writer Output {@link XMLStreamWriter}
124 * @param context Associated {@link EffectiveModelContext}.
125 * @param operationPath Parent operation (RPC or action) path.
126 * @return A new {@link NormalizedNodeStreamWriter}
128 public static @NonNull NormalizedNodeStreamWriter forInputOf(final XMLStreamWriter writer,
129 final EffectiveModelContext context, final Absolute operationPath) {
130 return forOperation(writer, context, operationPath,
131 YangConstants.operationInputQName(operationPath.lastNodeIdentifier().getModule()));
135 * Create a new writer with the specified context and rooted in the specified operation's output.
137 * @param writer Output {@link XMLStreamWriter}
138 * @param context Associated {@link EffectiveModelContext}.
139 * @param operationPath Parent operation (RPC or action) path.
140 * @return A new {@link NormalizedNodeStreamWriter}
142 public static @NonNull NormalizedNodeStreamWriter forOutputOf(final XMLStreamWriter writer,
143 final EffectiveModelContext context, final Absolute operationPath) {
144 return forOperation(writer, context, operationPath,
145 YangConstants.operationOutputQName(operationPath.lastNodeIdentifier().getModule()));
148 private static @NonNull NormalizedNodeStreamWriter forOperation(final XMLStreamWriter writer,
149 final EffectiveModelContext context, final Absolute operationPath, final QName qname) {
150 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
151 NormalizedNodeStreamWriterStack.ofOperation(context, operationPath, qname));
155 * Create a new schema-less writer. Note that this version is intended for debugging
156 * where doesn't have a SchemaContext available and isn't meant for production use.
158 * @param writer Output {@link XMLStreamWriter}
160 * @return A new {@link NormalizedNodeStreamWriter}
162 public static @NonNull NormalizedNodeStreamWriter createSchemaless(final XMLStreamWriter writer) {
163 return new SchemalessXMLStreamNormalizedNodeStreamWriter(writer);
167 public final List<MetadataExtension> supportedExtensions() {
168 return List.of(this);
171 abstract void startAnydata(NodeIdentifier name);
173 abstract void startList(NodeIdentifier name);
175 abstract void startListItem(PathArgument name) throws IOException;
177 abstract String encodeAnnotationValue(@NonNull ValueWriter xmlWriter, @NonNull QName qname, @NonNull Object value)
178 throws XMLStreamException;
180 abstract String encodeValue(@NonNull ValueWriter xmlWriter, @NonNull Object value, T context)
181 throws XMLStreamException;
183 final void writeValue(final @NonNull Object value, final T context) throws IOException {
185 facade.writeCharacters(encodeValue(facade, value, context));
186 } catch (XMLStreamException e) {
187 throw new IOException("Failed to write value", e);
191 final void startElement(final QName qname) throws IOException {
193 facade.writeStartElement(qname);
194 } catch (XMLStreamException e) {
195 throw new IOException("Failed to start element", e);
199 final void endElement() throws IOException {
201 facade.writeEndElement();
202 } catch (XMLStreamException e) {
203 throw new IOException("Failed to end element", e);
207 final void anydataValue(final Object value) throws IOException {
208 if (value instanceof DOMSourceAnydata) {
210 facade.anydataWriteStreamReader(((DOMSourceAnydata) value).toStreamReader());
211 } catch (XMLStreamException e) {
212 throw new IOException("Unable to transform anydata value: " + value, e);
214 } else if (value instanceof NormalizedAnydata) {
216 facade.emitNormalizedAnydata((NormalizedAnydata) value);
217 } catch (XMLStreamException e) {
218 throw new IOException("Unable to emit anydata value: " + value, e);
221 throw new IllegalStateException("Unexpected anydata value " + value);
225 final void anyxmlValue(final DOMSource domSource) throws IOException {
226 if (domSource != null) {
227 final Node domNode = requireNonNull(domSource.getNode());
229 facade.anyxmlWriteStreamReader(new DOMSourceXMLStreamReader(domSource));
230 } catch (XMLStreamException e) {
231 throw new IOException("Unable to transform anyXml value: " + domNode, e);
237 public final void startUnkeyedListItem(final NodeIdentifier name, final int childSizeHint) throws IOException {
242 public final void startMapEntryNode(final NodeIdentifierWithPredicates identifier, final int childSizeHint)
244 startListItem(identifier);
248 public final void startUnkeyedList(final NodeIdentifier name, final int childSizeHint) {
253 public final void startMapNode(final NodeIdentifier name, final int childSizeHint) {
258 public final void startOrderedMapNode(final NodeIdentifier name, final int childSizeHint) {
263 public final void close() throws IOException {
266 } catch (XMLStreamException e) {
267 throw new IOException("Failed to close writer", e);
272 public final void flush() throws IOException {
275 } catch (XMLStreamException e) {
276 throw new IOException("Failed to flush writer", e);
281 public final void metadata(final ImmutableMap<QName, Object> attributes) throws IOException {
282 for (final Entry<QName, Object> entry : attributes.entrySet()) {
283 final QName qname = entry.getKey();
284 final String namespace = qname.getNamespace().toString();
285 final String localName = qname.getLocalName();
286 final Object value = entry.getValue();
288 // FIXME: remove this handling once we have complete mapping to metadata
290 if (namespace.isEmpty()) {
291 // Legacy attribute, which is expected to be a String
292 StreamWriterFacade.warnLegacyAttribute(localName);
293 if (!(value instanceof String)) {
294 if (BROKEN_ATTRIBUTES.add(localName)) {
296 Unbound annotation {} does not have a String value, ignoring it. Please fix the \
297 source of this annotation either by formatting it to a String or removing its \
298 use""", localName, new Throwable("Call stack"));
300 LOG.debug("Ignoring annotation {} value {}", localName, value);
302 facade.writeAttribute(localName, (String) value);
306 final String prefix = facade.getPrefix(qname.getNamespace(), namespace);
307 final String attrValue = encodeAnnotationValue(facade, qname, value);
308 facade.writeAttribute(prefix, namespace, localName, attrValue);
310 } catch (final XMLStreamException e) {
311 throw new IOException("Unable to emit attribute " + qname, e);
317 public final boolean startAnydataNode(final NodeIdentifier name, final Class<?> objectModel) throws IOException {
318 if (DOMSourceAnydata.class.isAssignableFrom(objectModel)
319 || NormalizedAnydata.class.isAssignableFrom(objectModel)) {
321 startElement(name.getNodeType());