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;
72 private XmlParserStream(final NormalizedNodeStreamWriter writer, final XmlCodecFactory codecs,
73 final DataSchemaNode parentNode) {
74 this.writer = Preconditions.checkNotNull(writer);
75 this.codecs = Preconditions.checkNotNull(codecs);
76 this.parentNode = parentNode;
80 * Construct a new {@link XmlParserStream}.
82 * @param writer Output write
83 * @param codecs Shared codecs
84 * @param parentNode Parent root node
85 * @return A new stream instance
87 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final XmlCodecFactory codecs,
88 final SchemaNode parentNode) {
89 if (parentNode instanceof RpcDefinition) {
90 return new XmlParserStream(writer, codecs, new RpcAsContainer((RpcDefinition) parentNode));
92 Preconditions.checkArgument(parentNode instanceof DataSchemaNode, "Instance of DataSchemaNode class awaited.");
93 return new XmlParserStream(writer, codecs, (DataSchemaNode) parentNode);
97 * Construct a new {@link XmlParserStream}.
99 * @deprecated Use {@link #create(NormalizedNodeStreamWriter, SchemaContext, SchemaNode)} instead.
102 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext) {
103 return create(writer, schemaContext, schemaContext);
107 * Utility method for use when caching {@link XmlCodecFactory} is not feasible. Users with high performance
108 * requirements should use {@link #create(NormalizedNodeStreamWriter, XmlCodecFactory, SchemaNode)} instead and
109 * maintain a {@link XmlCodecFactory} to match the current {@link SchemaContext}.
111 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
112 final SchemaNode parentNode) {
113 return create(writer, XmlCodecFactory.create(schemaContext), parentNode);
117 * This method parses the XML source and emits node events into a NormalizedNodeStreamWriter based on the
118 * YANG-modeled data contained in the XML source.
121 * StAX reader which is to used to walk through the XML source
123 * instance of XmlParserStream
124 * @throws XMLStreamException
125 * if a well-formedness error or an unexpected processing condition occurs while parsing the XML
126 * @throws URISyntaxException
127 * if the namespace URI of an XML element contains a syntax error
128 * @throws IOException
129 * if an error occurs while parsing the value of an anyxml node
130 * @throws ParserConfigurationException
131 * if an error occurs while parsing the value of an anyxml node
132 * @throws SAXException
133 * if an error occurs while parsing the value of an anyxml node
135 public XmlParserStream parse(final XMLStreamReader reader) throws XMLStreamException, URISyntaxException,
136 IOException, ParserConfigurationException, SAXException {
137 if (reader.hasNext()) {
139 final AbstractNodeDataWithSchema nodeDataWithSchema;
140 if (parentNode instanceof ContainerSchemaNode) {
141 nodeDataWithSchema = new ContainerNodeDataWithSchema(parentNode);
142 } else if (parentNode instanceof ListSchemaNode) {
143 nodeDataWithSchema = new ListNodeDataWithSchema(parentNode);
144 } else if (parentNode instanceof YangModeledAnyXmlSchemaNode) {
145 nodeDataWithSchema = new YangModeledAnyXmlNodeDataWithSchema((YangModeledAnyXmlSchemaNode) parentNode);
146 } else if (parentNode instanceof AnyXmlSchemaNode) {
147 nodeDataWithSchema = new AnyXmlNodeDataWithSchema(parentNode);
148 } else if (parentNode instanceof LeafSchemaNode) {
149 nodeDataWithSchema = new LeafNodeDataWithSchema(parentNode);
150 } else if (parentNode instanceof LeafListSchemaNode) {
151 nodeDataWithSchema = new LeafListNodeDataWithSchema(parentNode);
153 throw new IllegalStateException("Unsupported schema node type " + parentNode.getClass() + ".");
156 read(reader, nodeDataWithSchema, reader.getLocalName());
157 nodeDataWithSchema.write(writer);
163 private static String readAnyXmlValue(final XMLStreamReader in) throws XMLStreamException {
164 final StringBuilder sb = new StringBuilder();
165 final String anyXmlElementName = in.getLocalName();
166 sb.append('<').append(anyXmlElementName).append(" xmlns=\"").append(in.getNamespaceURI()).append("\">");
168 while (in.hasNext()) {
169 final int eventType = in.next();
171 if (eventType == XMLStreamConstants.START_ELEMENT) {
172 sb.append('<').append(in.getLocalName()).append('>');
173 } else if (eventType == XMLStreamConstants.END_ELEMENT) {
174 sb.append("</").append(in.getLocalName()).append('>');
176 if (in.getLocalName().equals(anyXmlElementName)) {
180 } else if (eventType == XMLStreamConstants.CHARACTERS) {
181 sb.append(in.getText());
185 return sb.toString();
188 private void read(final XMLStreamReader in, final AbstractNodeDataWithSchema parent, final String rootElement)
189 throws XMLStreamException, URISyntaxException, ParserConfigurationException, SAXException, IOException {
194 if (parent instanceof LeafNodeDataWithSchema || parent instanceof LeafListEntryNodeDataWithSchema) {
195 setValue(parent, in.getElementText().trim(), in.getNamespaceContext());
196 if (isNextEndDocument(in)) {
200 if (!isAtElement(in)) {
206 if (parent instanceof LeafListNodeDataWithSchema || parent instanceof ListNodeDataWithSchema) {
207 String xmlElementName = in.getLocalName();
208 while (xmlElementName.equals(parent.getSchema().getQName().getLocalName())) {
209 read(in, newEntryNode(parent), rootElement);
210 if (in.getEventType() == XMLStreamConstants.END_DOCUMENT) {
213 xmlElementName = in.getLocalName();
219 if (parent instanceof AnyXmlNodeDataWithSchema) {
220 setValue(parent, readAnyXmlValue(in), in.getNamespaceContext());
221 if (isNextEndDocument(in)) {
225 if (!isAtElement(in)) {
232 switch (in.nextTag()) {
233 case XMLStreamConstants.START_ELEMENT:
234 final Set<String> namesakes = new HashSet<>();
235 while (in.hasNext()) {
236 final String xmlElementName = in.getLocalName();
238 DataSchemaNode parentSchema = parent.getSchema();
240 final String parentSchemaName = parentSchema.getQName().getLocalName();
241 if (parentSchemaName.equals(xmlElementName)
242 && in.getEventType() == XMLStreamConstants.END_ELEMENT) {
243 if (isNextEndDocument(in)) {
247 if (!isAtElement(in)) {
253 if (in.isEndElement() && rootElement.equals(xmlElementName)) {
257 if (parentSchema instanceof YangModeledAnyXmlSchemaNode) {
258 parentSchema = ((YangModeledAnyXmlSchemaNode) parentSchema).getSchemaOfAnyXmlData();
261 if (!namesakes.add(xmlElementName)) {
262 final Location loc = in.getLocation();
263 throw new IllegalStateException(String.format(
264 "Duplicate element \"%s\" in XML input at: line %s column %s", xmlElementName,
265 loc.getLineNumber(), loc.getColumnNumber()));
268 final String xmlElementNamespace = in.getNamespaceURI();
269 final Deque<DataSchemaNode> childDataSchemaNodes =
270 ParserStreamUtils.findSchemaNodeByNameAndNamespace(parentSchema, xmlElementName,
271 new URI(xmlElementNamespace));
273 Preconditions.checkState(!childDataSchemaNodes.isEmpty(),
274 "Schema for node with name %s and namespace %s doesn't exist.",
275 xmlElementName, xmlElementNamespace);
277 read(in, ((CompositeNodeDataWithSchema) parent).addChild(childDataSchemaNodes), rootElement);
280 case XMLStreamConstants.END_ELEMENT:
281 if (isNextEndDocument(in)) {
285 if (!isAtElement(in)) {
294 private static boolean isNextEndDocument(final XMLStreamReader in) throws XMLStreamException {
295 return in.next() == XMLStreamConstants.END_DOCUMENT;
298 private static boolean isAtElement(final XMLStreamReader in) {
299 return in.getEventType() == XMLStreamConstants.START_ELEMENT
300 || in.getEventType() == XMLStreamConstants.END_ELEMENT;
303 private void setValue(final AbstractNodeDataWithSchema parent, final String value, final NamespaceContext nsContext)
304 throws ParserConfigurationException, SAXException, IOException {
305 Preconditions.checkArgument(parent instanceof SimpleNodeDataWithSchema, "Node %s is not a simple type",
306 parent.getSchema().getQName());
307 final SimpleNodeDataWithSchema parentSimpleNode = (SimpleNodeDataWithSchema) parent;
308 Preconditions.checkArgument(parentSimpleNode.getValue() == null, "Node '%s' has already set its value to '%s'",
309 parentSimpleNode.getSchema().getQName(), parentSimpleNode.getValue());
311 parentSimpleNode.setValue(translateValueByType(value, parentSimpleNode.getSchema(), nsContext));
314 private Object translateValueByType(final String value, final DataSchemaNode node,
315 final NamespaceContext namespaceCtx) throws IOException, SAXException, ParserConfigurationException {
316 if (node instanceof AnyXmlSchemaNode) {
318 * FIXME: Figure out some YANG extension dispatch, which will
319 * reuse JSON parsing or XML parsing - anyxml is not well-defined in
322 final Document doc = UntrustedXML.newDocumentBuilder().parse(new InputSource(new StringReader(value)));
325 return new DOMSource(doc.getDocumentElement());
328 Preconditions.checkArgument(node instanceof TypedSchemaNode);
329 return codecs.codecFor((TypedSchemaNode) node).parseValue(namespaceCtx, value);
332 private static AbstractNodeDataWithSchema newEntryNode(final AbstractNodeDataWithSchema parent) {
333 final AbstractNodeDataWithSchema newChild;
334 if (parent instanceof ListNodeDataWithSchema) {
335 newChild = new ListEntryNodeDataWithSchema(parent.getSchema());
337 newChild = new LeafListEntryNodeDataWithSchema(parent.getSchema());
339 ((CompositeNodeDataWithSchema) parent).addChild(newChild);
344 public void close() throws IOException {
350 public void flush() throws IOException {