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.ClassToInstanceMap;
13 import com.google.common.collect.ImmutableClassToInstanceMap;
14 import com.google.common.collect.ImmutableMap;
15 import java.io.IOException;
16 import java.util.Map.Entry;
18 import java.util.concurrent.ConcurrentHashMap;
19 import javax.xml.stream.XMLStreamException;
20 import javax.xml.stream.XMLStreamWriter;
21 import javax.xml.transform.dom.DOMSource;
22 import org.eclipse.jdt.annotation.NonNull;
23 import org.opendaylight.yangtools.rfc7952.data.api.StreamWriterMetadataExtension;
24 import org.opendaylight.yangtools.yang.common.QName;
25 import org.opendaylight.yangtools.yang.common.YangConstants;
26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
30 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedAnydata;
31 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
32 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriterExtension;
33 import org.opendaylight.yangtools.yang.data.util.NormalizedNodeStreamWriterStack;
34 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
35 import org.opendaylight.yangtools.yang.model.api.EffectiveStatementInference;
36 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
37 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
38 import org.slf4j.Logger;
39 import org.slf4j.LoggerFactory;
40 import org.w3c.dom.Node;
43 * A {@link NormalizedNodeStreamWriter} which translates the events into an {@link XMLStreamWriter}, resulting in an
44 * RFC6020 XML encoding. There are 2 versions of this class, one that takes a SchemaContext and encodes values
45 * appropriately according to the YANG schema. The other is schema-less and merely outputs values using toString. The
46 * latter is intended for debugging where doesn't have a SchemaContext available and isn't meant for production use.
49 * Due to backwards compatibility reasons this writer recognizes RFC7952 metadata include keys QNames with empty URI
50 * (as exposed via {@link XmlParserStream#LEGACY_ATTRIBUTE_NAMESPACE}) as their QNameModule. These indicate an
51 * unqualified XML attribute and their value can be assumed to be a String. Furthermore, this extends to qualified
52 * attributes, which uses the proper namespace, but will not bind to a proper module revision. This caveat will be
53 * removed in a future version.
55 public abstract class XMLStreamNormalizedNodeStreamWriter<T> implements NormalizedNodeStreamWriter,
56 StreamWriterMetadataExtension {
57 private static final Logger LOG = LoggerFactory.getLogger(XMLStreamNormalizedNodeStreamWriter.class);
58 private static final Set<String> BROKEN_ATTRIBUTES = ConcurrentHashMap.newKeySet();
60 private final @NonNull StreamWriterFacade facade;
62 XMLStreamNormalizedNodeStreamWriter(final XMLStreamWriter writer) {
63 facade = new StreamWriterFacade(writer);
67 * Create a new writer with the specified context as its root.
69 * @param writer Output {@link XMLStreamWriter}
70 * @param context Associated {@link EffectiveModelContext}.
71 * @return A new {@link NormalizedNodeStreamWriter}
73 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
74 final EffectiveModelContext context) {
75 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
76 NormalizedNodeStreamWriterStack.of(context));
80 * Create a new writer with the specified context and rooted at the specified node.
82 * @param writer Output {@link XMLStreamWriter}
83 * @param inference root node inference
84 * @return A new {@link NormalizedNodeStreamWriter}
86 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
87 final EffectiveStatementInference inference) {
88 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, inference.getEffectiveModelContext(),
89 NormalizedNodeStreamWriterStack.of(inference));
93 * Create a new writer with the specified context and rooted in the specified schema path.
95 * @param writer Output {@link XMLStreamWriter}
96 * @param context Associated {@link EffectiveModelContext}.
98 * @return A new {@link NormalizedNodeStreamWriter}
100 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
101 final EffectiveModelContext context, final SchemaPath path) {
102 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
103 NormalizedNodeStreamWriterStack.of(context, path));
107 * Create a new writer with the specified context and rooted in the specified schema path.
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 Absolute 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 {@link YangInstanceIdentifier}.
123 * @param writer Output {@link XMLStreamWriter}
124 * @param context Associated {@link EffectiveModelContext}.
126 * @return A new {@link NormalizedNodeStreamWriter}
128 public static @NonNull NormalizedNodeStreamWriter create(final XMLStreamWriter writer,
129 final EffectiveModelContext context, final YangInstanceIdentifier path) {
130 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
131 NormalizedNodeStreamWriterStack.of(context, path));
135 * Create a new writer with the specified context and rooted in the specified operation's input.
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 forInputOf(final XMLStreamWriter writer,
143 final EffectiveModelContext context, final Absolute operationPath) {
144 return forOperation(writer, context, operationPath,
145 YangConstants.operationInputQName(operationPath.lastNodeIdentifier().getModule()));
149 * Create a new writer with the specified context and rooted in the specified operation's output.
151 * @param writer Output {@link XMLStreamWriter}
152 * @param context Associated {@link EffectiveModelContext}.
153 * @param operationPath Parent operation (RPC or action) path.
154 * @return A new {@link NormalizedNodeStreamWriter}
156 public static @NonNull NormalizedNodeStreamWriter forOutputOf(final XMLStreamWriter writer,
157 final EffectiveModelContext context, final Absolute operationPath) {
158 return forOperation(writer, context, operationPath,
159 YangConstants.operationOutputQName(operationPath.lastNodeIdentifier().getModule()));
162 private static @NonNull NormalizedNodeStreamWriter forOperation(final XMLStreamWriter writer,
163 final EffectiveModelContext context, final Absolute operationPath, final QName qname) {
164 return new SchemaAwareXMLStreamNormalizedNodeStreamWriter(writer, context,
165 NormalizedNodeStreamWriterStack.ofOperation(context, operationPath, qname));
169 * Create a new schema-less writer. Note that this version is intended for debugging
170 * where doesn't have a SchemaContext available and isn't meant for production use.
172 * @param writer Output {@link XMLStreamWriter}
174 * @return A new {@link NormalizedNodeStreamWriter}
176 public static @NonNull NormalizedNodeStreamWriter createSchemaless(final XMLStreamWriter writer) {
177 return new SchemalessXMLStreamNormalizedNodeStreamWriter(writer);
181 public final ClassToInstanceMap<NormalizedNodeStreamWriterExtension> getExtensions() {
182 return ImmutableClassToInstanceMap.of(StreamWriterMetadataExtension.class, this);
185 abstract void startAnydata(NodeIdentifier name);
187 abstract void startList(NodeIdentifier name);
189 abstract void startListItem(PathArgument name) throws IOException;
191 abstract String encodeAnnotationValue(@NonNull ValueWriter xmlWriter, @NonNull QName qname, @NonNull Object value)
192 throws XMLStreamException;
194 abstract String encodeValue(@NonNull ValueWriter xmlWriter, @NonNull Object value, T context)
195 throws XMLStreamException;
197 final void writeValue(final @NonNull Object value, final T context) throws IOException {
199 facade.writeCharacters(encodeValue(facade, value, context));
200 } catch (XMLStreamException e) {
201 throw new IOException("Failed to write value", e);
205 final void startElement(final QName qname) throws IOException {
207 facade.writeStartElement(qname);
208 } catch (XMLStreamException e) {
209 throw new IOException("Failed to start element", e);
213 final void endElement() throws IOException {
215 facade.writeEndElement();
216 } catch (XMLStreamException e) {
217 throw new IOException("Failed to end element", e);
221 final void anydataValue(final Object value) throws IOException {
222 if (value instanceof DOMSourceAnydata) {
224 facade.anydataWriteStreamReader(((DOMSourceAnydata) value).toStreamReader());
225 } catch (XMLStreamException e) {
226 throw new IOException("Unable to transform anydata value: " + value, e);
228 } else if (value instanceof NormalizedAnydata) {
230 facade.emitNormalizedAnydata((NormalizedAnydata) value);
231 } catch (XMLStreamException e) {
232 throw new IOException("Unable to emit anydata value: " + value, e);
235 throw new IllegalStateException("Unexpected anydata value " + value);
239 final void anyxmlValue(final DOMSource domSource) throws IOException {
240 if (domSource != null) {
241 final Node domNode = requireNonNull(domSource.getNode());
243 facade.anyxmlWriteStreamReader(new DOMSourceXMLStreamReader(domSource));
244 } catch (XMLStreamException e) {
245 throw new IOException("Unable to transform anyXml value: " + domNode, e);
251 public final void startUnkeyedListItem(final NodeIdentifier name, final int childSizeHint) throws IOException {
256 public final void startMapEntryNode(final NodeIdentifierWithPredicates identifier, final int childSizeHint)
258 startListItem(identifier);
262 public final void startUnkeyedList(final NodeIdentifier name, final int childSizeHint) {
267 public final void startMapNode(final NodeIdentifier name, final int childSizeHint) {
272 public final void startOrderedMapNode(final NodeIdentifier name, final int childSizeHint) {
277 public final void close() throws IOException {
280 } catch (XMLStreamException e) {
281 throw new IOException("Failed to close writer", e);
286 public final void flush() throws IOException {
289 } catch (XMLStreamException e) {
290 throw new IOException("Failed to flush writer", e);
295 public final void metadata(final ImmutableMap<QName, Object> attributes) throws IOException {
296 for (final Entry<QName, Object> entry : attributes.entrySet()) {
297 final QName qname = entry.getKey();
298 final String namespace = qname.getNamespace().toString();
299 final String localName = qname.getLocalName();
300 final Object value = entry.getValue();
302 // FIXME: remove this handling once we have complete mapping to metadata
304 if (namespace.isEmpty()) {
305 // Legacy attribute, which is expected to be a String
306 StreamWriterFacade.warnLegacyAttribute(localName);
307 if (!(value instanceof String)) {
308 if (BROKEN_ATTRIBUTES.add(localName)) {
309 LOG.warn("Unbound annotation {} does not have a String value, ignoring it. Please fix the "
310 + "source of this annotation either by formatting it to a String or removing its "
311 + "use", localName, new Throwable("Call stack"));
313 LOG.debug("Ignoring annotation {} value {}", localName, value);
315 facade.writeAttribute(localName, (String) value);
319 final String prefix = facade.getPrefix(qname.getNamespace(), namespace);
320 final String attrValue = encodeAnnotationValue(facade, qname, value);
321 facade.writeAttribute(prefix, namespace, localName, attrValue);
323 } catch (final XMLStreamException e) {
324 throw new IOException("Unable to emit attribute " + qname, e);
330 public final boolean startAnydataNode(final NodeIdentifier name, final Class<?> objectModel) throws IOException {
331 if (DOMSourceAnydata.class.isAssignableFrom(objectModel)
332 || NormalizedAnydata.class.isAssignableFrom(objectModel)) {
334 startElement(name.getNodeType());