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.LeafListEntryNodeDataWithSchema;
36 import org.opendaylight.yangtools.yang.data.util.LeafListNodeDataWithSchema;
37 import org.opendaylight.yangtools.yang.data.util.LeafNodeDataWithSchema;
38 import org.opendaylight.yangtools.yang.data.util.ListEntryNodeDataWithSchema;
39 import org.opendaylight.yangtools.yang.data.util.ListNodeDataWithSchema;
40 import org.opendaylight.yangtools.yang.data.util.ParserStreamUtils;
41 import org.opendaylight.yangtools.yang.data.util.RpcAsContainer;
42 import org.opendaylight.yangtools.yang.data.util.SimpleNodeDataWithSchema;
43 import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
44 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
45 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
46 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
47 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
48 import org.opendaylight.yangtools.yang.model.api.YangModeledAnyXmlSchemaNode;
49 import org.w3c.dom.Document;
50 import org.xml.sax.InputSource;
51 import org.xml.sax.SAXException;
54 * This class provides functionality for parsing an XML source containing YANG-modeled data. It disallows multiple
55 * instances of the same element except for leaf-list and list entries. It also expects that the YANG-modeled data in
56 * the XML source are wrapped in a root element.
60 public final class XmlParserStream implements Closeable, Flushable {
61 private final NormalizedNodeStreamWriter writer;
62 private final XmlCodecFactory codecs;
63 private final DataSchemaNode parentNode;
65 private XmlParserStream(final NormalizedNodeStreamWriter writer, final XmlCodecFactory codecs,
66 final DataSchemaNode parentNode) {
67 this.writer = Preconditions.checkNotNull(writer);
68 this.codecs = Preconditions.checkNotNull(codecs);
69 this.parentNode = parentNode;
73 * Construct a new {@link XmlParserStream}.
75 * @param writer Output write
76 * @param codecs Shared codecs
77 * @param parentNode Parent root node
78 * @return A new stream instance
80 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final XmlCodecFactory codecs,
81 final SchemaNode parentNode) {
82 if (parentNode instanceof RpcDefinition) {
83 return new XmlParserStream(writer, codecs, new RpcAsContainer((RpcDefinition) parentNode));
85 Preconditions.checkArgument(parentNode instanceof DataSchemaNode, "Instance of DataSchemaNode class awaited.");
86 return new XmlParserStream(writer, codecs, (DataSchemaNode) parentNode);
90 * @deprecated Use {@link #create(NormalizedNodeStreamWriter, SchemaContext, SchemaNode)} instead.
93 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext) {
94 return create(writer, schemaContext, schemaContext);
98 * Utility method for use when caching {@link XmlCodecFactory} is not feasible. Users with high performance
99 * requirements should use {@link #create(NormalizedNodeStreamWriter, XmlCodecFactory, SchemaNode)} instead and
100 * maintain a {@link XmlCodecFactory} to match the current {@link SchemaContext}.
102 public static XmlParserStream create(final NormalizedNodeStreamWriter writer, final SchemaContext schemaContext,
103 final SchemaNode parentNode) {
104 return create(writer, XmlCodecFactory.create(schemaContext), parentNode);
108 * This method parses the XML source and emits node events into a NormalizedNodeStreamWriter based on the
109 * YANG-modeled data contained in the XML source.
112 * StAX reader which is to used to walk through the XML source
114 * instance of XmlParserStream
115 * @throws XMLStreamException
116 * if a well-formedness error or an unexpected processing condition occurs while parsing the XML
117 * @throws URISyntaxException
118 * if the namespace URI of an XML element contains a syntax error
119 * @throws IOException
120 * if an error occurs while parsing the value of an anyxml node
121 * @throws ParserConfigurationException
122 * if an error occurs while parsing the value of an anyxml node
123 * @throws SAXException
124 * if an error occurs while parsing the value of an anyxml node
126 public XmlParserStream parse(final XMLStreamReader reader) throws XMLStreamException, URISyntaxException,
127 IOException, ParserConfigurationException, SAXException {
128 if (reader.hasNext()) {
129 final CompositeNodeDataWithSchema compositeNodeDataWithSchema = new CompositeNodeDataWithSchema(parentNode);
131 read(reader, compositeNodeDataWithSchema, reader.getLocalName());
132 compositeNodeDataWithSchema.write(writer);
138 private static String readAnyXmlValue(final XMLStreamReader in) throws XMLStreamException {
139 final StringBuilder sb = new StringBuilder();
140 final String anyXmlElementName = in.getLocalName();
141 sb.append('<').append(anyXmlElementName).append(" xmlns=\"").append(in.getNamespaceURI()).append("\">");
143 while (in.hasNext()) {
144 final int eventType = in.next();
146 if (eventType == XMLStreamConstants.START_ELEMENT) {
147 sb.append('<').append(in.getLocalName()).append('>');
148 } else if (eventType == XMLStreamConstants.END_ELEMENT) {
149 sb.append("</").append(in.getLocalName()).append('>');
151 if (in.getLocalName().equals(anyXmlElementName)) {
155 } else if (eventType == XMLStreamConstants.CHARACTERS) {
156 sb.append(in.getText());
160 return sb.toString();
163 private void read(final XMLStreamReader in, final AbstractNodeDataWithSchema parent, final String rootElement)
164 throws XMLStreamException, URISyntaxException, ParserConfigurationException, SAXException, IOException {
169 if (parent instanceof LeafNodeDataWithSchema || parent instanceof LeafListEntryNodeDataWithSchema) {
170 setValue(parent, in.getElementText().trim(), in.getNamespaceContext());
175 if (parent instanceof LeafListNodeDataWithSchema || parent instanceof ListNodeDataWithSchema) {
176 String xmlElementName = in.getLocalName();
177 while (xmlElementName.equals(parent.getSchema().getQName().getLocalName())) {
178 read(in, newEntryNode(parent), rootElement);
179 xmlElementName = in.getLocalName();
185 if (parent instanceof AnyXmlNodeDataWithSchema) {
186 setValue(parent, readAnyXmlValue(in), in.getNamespaceContext());
191 switch (in.nextTag()) {
192 case XMLStreamConstants.START_ELEMENT:
193 final Set<String> namesakes = new HashSet<>();
194 while (in.hasNext()) {
195 final String xmlElementName = in.getLocalName();
196 if (rootElement.equals(xmlElementName)) {
200 DataSchemaNode parentSchema = parent.getSchema();
202 final String parentSchemaName = parentSchema.getQName().getLocalName();
203 if (parentSchemaName.equals(xmlElementName) && in.getEventType() == XMLStreamConstants.END_ELEMENT) {
208 if (parentSchema instanceof YangModeledAnyXmlSchemaNode) {
209 parentSchema = ((YangModeledAnyXmlSchemaNode) parentSchema).getSchemaOfAnyXmlData();
212 if (!namesakes.add(xmlElementName)) {
213 final Location loc = in.getLocation();
214 throw new IllegalStateException(String.format(
215 "Duplicate element \"%s\" in XML input at: line %s column %s", xmlElementName,
216 loc.getLineNumber(), loc.getColumnNumber()));
219 final String xmlElementNamespace = in.getNamespaceURI();
220 final Deque<DataSchemaNode> childDataSchemaNodes =
221 ParserStreamUtils.findSchemaNodeByNameAndNamespace(parentSchema, xmlElementName,
222 new URI(xmlElementNamespace));
224 Preconditions.checkState(!childDataSchemaNodes.isEmpty(),
225 "Schema for node with name %s and namespace %s doesn't exist.",
226 xmlElementName, xmlElementNamespace);
228 read(in, ((CompositeNodeDataWithSchema) parent).addChild(childDataSchemaNodes), rootElement);
231 case XMLStreamConstants.END_ELEMENT:
237 private void setValue(final AbstractNodeDataWithSchema parent, final String value, final NamespaceContext nsContext)
238 throws ParserConfigurationException, SAXException, IOException {
239 Preconditions.checkArgument(parent instanceof SimpleNodeDataWithSchema, "Node %s is not a simple type",
240 parent.getSchema().getQName());
241 final SimpleNodeDataWithSchema parentSimpleNode = (SimpleNodeDataWithSchema) parent;
242 Preconditions.checkArgument(parentSimpleNode.getValue() == null, "Node '%s' has already set its value to '%s'",
243 parentSimpleNode.getSchema().getQName(), parentSimpleNode.getValue());
245 parentSimpleNode.setValue(translateValueByType(value, parentSimpleNode.getSchema(), nsContext));
248 private Object translateValueByType(final String value, final DataSchemaNode node, final NamespaceContext namespaceCtx)
249 throws IOException, SAXException, ParserConfigurationException {
250 if (node instanceof AnyXmlSchemaNode) {
252 * FIXME: Figure out some YANG extension dispatch, which will
253 * reuse JSON parsing or XML parsing - anyxml is not well-defined in
256 final Document doc = UntrustedXML.newDocumentBuilder().parse(new InputSource(new StringReader(value)));
259 return new DOMSource(doc.getDocumentElement());
262 return codecs.codecFor(node, namespaceCtx).deserialize(value);
265 private static AbstractNodeDataWithSchema newEntryNode(final AbstractNodeDataWithSchema parent) {
266 final AbstractNodeDataWithSchema newChild;
267 if (parent instanceof ListNodeDataWithSchema) {
268 newChild = new ListEntryNodeDataWithSchema(parent.getSchema());
270 newChild = new LeafListEntryNodeDataWithSchema(parent.getSchema());
272 ((CompositeNodeDataWithSchema) parent).addChild(newChild);
277 public void close() throws IOException {
283 public void flush() throws IOException {