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.yangtools.yang.data.impl.codec.xml;
10 import static com.google.common.base.Preconditions.checkState;
13 import java.util.Collection;
14 import java.util.HashMap;
15 import java.util.List;
17 import java.util.Map.Entry;
18 import java.util.Random;
21 import javax.activation.UnsupportedDataTypeException;
22 import javax.xml.parsers.DocumentBuilder;
23 import javax.xml.parsers.DocumentBuilderFactory;
24 import javax.xml.parsers.ParserConfigurationException;
26 import org.opendaylight.yangtools.yang.common.QName;
27 import org.opendaylight.yangtools.yang.data.api.AttributesContainer;
28 import org.opendaylight.yangtools.yang.data.api.CompositeNode;
29 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
30 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier.NodeIdentifierWithPredicates;
31 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier.PathArgument;
32 import org.opendaylight.yangtools.yang.data.api.Node;
33 import org.opendaylight.yangtools.yang.data.api.SimpleNode;
34 import org.opendaylight.yangtools.yang.data.impl.ImmutableCompositeNode;
35 import org.opendaylight.yangtools.yang.data.impl.SimpleNodeTOImpl;
36 import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
37 import org.opendaylight.yangtools.yang.data.impl.util.CompositeNodeBuilder;
38 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
39 import org.opendaylight.yangtools.yang.model.api.ChoiceNode;
40 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
41 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
42 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
43 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
44 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
45 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
46 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
47 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
48 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
49 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
50 import org.slf4j.Logger;
51 import org.slf4j.LoggerFactory;
52 import org.w3c.dom.Document;
53 import org.w3c.dom.Element;
54 import org.w3c.dom.NodeList;
56 import com.google.common.base.Function;
57 import com.google.common.base.Objects;
58 import com.google.common.base.Optional;
59 import com.google.common.base.Preconditions;
60 import com.google.common.base.Strings;
61 import com.google.common.collect.ImmutableList;
63 public class XmlDocumentUtils {
65 private static final XmlCodecProvider DEFAULT_XML_VALUE_CODEC_PROVIDER = new XmlCodecProvider() {
68 public TypeDefinitionAwareCodec<Object, ? extends TypeDefinition<?>> codecFor(TypeDefinition<?> baseType) {
69 return TypeDefinitionAwareCodec.from(baseType);
73 private static final Logger logger = LoggerFactory.getLogger(XmlDocumentUtils.class);
75 public static Document toDocument(CompositeNode data, DataNodeContainer schema, XmlCodecProvider codecProvider)
76 throws UnsupportedDataTypeException {
77 Preconditions.checkNotNull(data);
78 Preconditions.checkNotNull(schema);
80 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
83 DocumentBuilder bob = dbf.newDocumentBuilder();
84 doc = bob.newDocument();
85 } catch (ParserConfigurationException e) {
89 if (schema instanceof ContainerSchemaNode || schema instanceof ListSchemaNode) {
90 doc.appendChild(createXmlRootElement(doc, data, (SchemaNode) schema, codecProvider));
93 throw new UnsupportedDataTypeException(
94 "Schema can be ContainerSchemaNode or ListSchemaNode. Other types are not supported yet.");
98 private static Element createXmlRootElement(Document doc, Node<?> data, SchemaNode schema,
99 XmlCodecProvider codecProvider) throws UnsupportedDataTypeException {
100 Element itemEl = createElementFor(doc, data);
101 if (data instanceof SimpleNode<?>) {
102 if (schema instanceof LeafListSchemaNode) {
103 writeValueByType(itemEl, (SimpleNode<?>) data, ((LeafListSchemaNode) schema).getType(),
104 (DataSchemaNode) schema, codecProvider);
105 } else if (schema instanceof LeafSchemaNode) {
106 writeValueByType(itemEl, (SimpleNode<?>) data, ((LeafSchemaNode) schema).getType(),
107 (DataSchemaNode) schema, codecProvider);
109 Object value = data.getValue();
111 itemEl.setTextContent(String.valueOf(value));
114 } else { // CompositeNode
115 for (Node<?> child : ((CompositeNode) data).getChildren()) {
116 DataSchemaNode childSchema = null;
117 if (schema != null) {
118 childSchema = findFirstSchemaForNode(child, ((DataNodeContainer) schema).getChildNodes());
119 if (logger.isDebugEnabled()) {
120 if (childSchema == null) {
121 logger.debug("Probably the data node \""
122 + ((child == null) ? "" : child.getNodeType().getLocalName())
123 + "\" is not conform to schema");
127 itemEl.appendChild(createXmlRootElement(doc, child, childSchema, codecProvider));
133 private static Element createElementFor(Document doc, Node<?> data) {
134 QName dataType = data.getNodeType();
136 if (dataType.getNamespace() != null) {
137 ret = doc.createElementNS(dataType.getNamespace().toString(), dataType.getLocalName());
139 ret = doc.createElementNS(null, dataType.getLocalName());
141 if (data instanceof AttributesContainer && ((AttributesContainer) data).getAttributes() != null) {
142 for (Entry<QName, String> attribute : ((AttributesContainer) data).getAttributes().entrySet()) {
143 ret.setAttributeNS(attribute.getKey().getNamespace().toString(), attribute.getKey().getLocalName(),
144 attribute.getValue());
151 public static void writeValueByType(Element element, SimpleNode<?> node, TypeDefinition<?> type,
152 DataSchemaNode schema, XmlCodecProvider codecProvider) {
153 TypeDefinition<?> baseType = resolveBaseTypeFrom(type);
155 if (baseType instanceof IdentityrefTypeDefinition) {
156 if (node.getValue() instanceof QName) {
157 QName value = (QName) node.getValue();
159 if (value.getPrefix() != null && !value.getPrefix().isEmpty()) {
160 prefix = value.getPrefix();
162 element.setAttribute("xmlns:" + prefix, value.getNamespace().toString());
163 element.setTextContent(prefix + ":" + value.getLocalName());
165 Object value = node.getValue();
166 logger.debug("Value of {}:{} is not instance of QName but is {}", baseType.getQName().getNamespace(),
167 baseType.getQName().getLocalName(), value != null ? value.getClass() : "null");
169 element.setTextContent(String.valueOf(value));
172 } else if (baseType instanceof InstanceIdentifierTypeDefinition) {
173 if (node.getValue() instanceof InstanceIdentifier) {
174 // Map< key = namespace, value = prefix>
175 Map<String, String> prefixes = new HashMap<>();
176 InstanceIdentifier instanceIdentifier = (InstanceIdentifier) node.getValue();
177 StringBuilder textContent = new StringBuilder();
178 for (PathArgument pathArgument : instanceIdentifier.getPath()) {
179 textContent.append("/");
180 writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType(), prefixes);
181 if (pathArgument instanceof NodeIdentifierWithPredicates) {
182 Map<QName, Object> predicates = ((NodeIdentifierWithPredicates) pathArgument).getKeyValues();
184 for (QName keyValue : predicates.keySet()) {
185 String predicateValue = String.valueOf(predicates.get(keyValue));
186 textContent.append("[");
187 writeIdentifierWithNamespacePrefix(element, textContent, keyValue, prefixes);
188 textContent.append("='");
189 textContent.append(predicateValue);
190 textContent.append("'");
191 textContent.append("]");
195 element.setTextContent(textContent.toString());
198 Object value = node.getValue();
199 logger.debug("Value of {}:{} is not instance of InstanceIdentifier but is {}", baseType.getQName()
201 baseType.getQName().getLocalName(), value != null ? value.getClass() : "null");
203 element.setTextContent(String.valueOf(value));
207 if (node.getValue() != null) {
208 final TypeDefinitionAwareCodec<Object, ?> codec = codecProvider.codecFor(baseType);
211 final String text = codec.serialize(node.getValue());
212 element.setTextContent(text);
213 } catch (ClassCastException e) {
214 logger.error("Provided node did not have type required by mapping. Using stream instead.", e);
215 element.setTextContent(String.valueOf(node.getValue()));
218 logger.error("Failed to find codec for {}, falling back to using stream", baseType);
219 element.setTextContent(String.valueOf(node.getValue()));
225 private static void writeIdentifierWithNamespacePrefix(Element element, StringBuilder textContent, QName qName,
226 Map<String, String> prefixes) {
227 String namespace = qName.getNamespace().toString();
228 String prefix = prefixes.get(namespace);
229 if (prefix == null) {
230 prefix = qName.getPrefix();
231 if (prefix == null || prefix.isEmpty() || prefixes.containsValue(prefix)) {
232 prefix = generateNewPrefix(prefixes.values());
236 element.setAttribute("xmlns:" + prefix, namespace.toString());
237 textContent.append(prefix);
238 prefixes.put(namespace, prefix);
240 textContent.append(":");
241 textContent.append(qName.getLocalName());
244 private static String generateNewPrefix(Collection<String> prefixes) {
245 StringBuilder result = null;
246 Random random = new Random();
248 result = new StringBuilder();
249 for (int i = 0; i < 4; i++) {
250 int randomNumber = 0x61 + (Math.abs(random.nextInt()) % 26);
251 result.append(Character.toChars(randomNumber));
253 } while (prefixes.contains(result.toString()));
255 return result.toString();
258 public final static TypeDefinition<?> resolveBaseTypeFrom(TypeDefinition<?> type) {
259 TypeDefinition<?> superType = type;
260 while (superType.getBaseType() != null) {
261 superType = superType.getBaseType();
266 private static final DataSchemaNode findFirstSchemaForNode(Node<?> node, Set<DataSchemaNode> dataSchemaNode) {
267 if (dataSchemaNode != null && node != null) {
268 for (DataSchemaNode dsn : dataSchemaNode) {
269 if (node.getNodeType().getLocalName().equals(dsn.getQName().getLocalName())) {
271 } else if (dsn instanceof ChoiceNode) {
272 for (ChoiceCaseNode choiceCase : ((ChoiceNode) dsn).getCases()) {
273 DataSchemaNode foundDsn = findFirstSchemaForNode(node, choiceCase.getChildNodes());
274 if (foundDsn != null) {
284 public static Node<?> toDomNode(Element xmlElement, Optional<DataSchemaNode> schema,
285 Optional<XmlCodecProvider> codecProvider) {
286 if (schema.isPresent()) {
287 return toNodeWithSchema(xmlElement, schema.get(), codecProvider.or(DEFAULT_XML_VALUE_CODEC_PROVIDER));
289 return toDomNode(xmlElement);
292 public static CompositeNode fromElement(Element xmlElement) {
293 CompositeNodeBuilder<ImmutableCompositeNode> node = ImmutableCompositeNode.builder();
294 node.setQName(qNameFromElement(xmlElement));
296 return node.toInstance();
299 private static QName qNameFromElement(Element xmlElement) {
300 String namespace = xmlElement.getNamespaceURI();
301 String localName = xmlElement.getLocalName();
302 return QName.create(namespace != null ? URI.create(namespace) : null, null, localName);
305 private static Node<?> toNodeWithSchema(Element xmlElement, DataSchemaNode schema, XmlCodecProvider codecProvider) {
306 checkQName(xmlElement, schema.getQName());
307 if (schema instanceof DataNodeContainer) {
308 return toCompositeNodeWithSchema(xmlElement, schema.getQName(), (DataNodeContainer) schema, codecProvider);
309 } else if (schema instanceof LeafSchemaNode) {
310 return toSimpleNodeWithType(xmlElement, (LeafSchemaNode) schema, codecProvider);
311 } else if (schema instanceof LeafListSchemaNode) {
312 return toSimpleNodeWithType(xmlElement, (LeafListSchemaNode) schema, codecProvider);
318 private static Node<?> toSimpleNodeWithType(Element xmlElement, LeafSchemaNode schema,
319 XmlCodecProvider codecProvider) {
320 TypeDefinitionAwareCodec<Object, ? extends TypeDefinition<?>> codec = codecProvider.codecFor(schema.getType());
321 String text = xmlElement.getTextContent();
324 value = codec.deserialize(text);
327 value = xmlElement.getTextContent();
329 return new SimpleNodeTOImpl<Object>(schema.getQName(), null, value);
332 private static Node<?> toSimpleNodeWithType(Element xmlElement, LeafListSchemaNode schema,
333 XmlCodecProvider codecProvider) {
334 TypeDefinitionAwareCodec<Object, ? extends TypeDefinition<?>> codec = codecProvider.codecFor(schema.getType());
335 String text = xmlElement.getTextContent();
338 value = codec.deserialize(text);
341 value = xmlElement.getTextContent();
343 return new SimpleNodeTOImpl<Object>(schema.getQName(), null, value);
346 private static Node<?> toCompositeNodeWithSchema(Element xmlElement, QName qName, DataNodeContainer schema,
347 XmlCodecProvider codecProvider) {
348 List<Node<?>> values = toDomNodes(xmlElement, Optional.fromNullable(schema.getChildNodes()));
349 return ImmutableCompositeNode.create(qName, values);
352 private static void checkQName(Element xmlElement, QName qName) {
353 checkState(Objects.equal(xmlElement.getNamespaceURI(), qName.getNamespace().toString()));
354 checkState(qName.getLocalName().equals(xmlElement.getLocalName()));
357 private static final Optional<DataSchemaNode> findFirstSchema(QName qname, Set<DataSchemaNode> dataSchemaNode) {
358 if (dataSchemaNode != null && !dataSchemaNode.isEmpty() && qname != null) {
359 for (DataSchemaNode dsn : dataSchemaNode) {
360 if (qname.isEqualWithoutRevision(dsn.getQName())) {
361 return Optional.<DataSchemaNode> of(dsn);
362 } else if (dsn instanceof ChoiceNode) {
363 for (ChoiceCaseNode choiceCase : ((ChoiceNode) dsn).getCases()) {
364 Optional<DataSchemaNode> foundDsn = findFirstSchema(qname, choiceCase.getChildNodes());
365 if (foundDsn != null) {
372 return Optional.absent();
375 public static Node<?> toDomNode(Document doc) {
376 return toDomNode(doc.getDocumentElement());
379 private static Node<?> toDomNode(Element element) {
380 QName qname = qNameFromElement(element);
382 ImmutableList.Builder<Node<?>> values = ImmutableList.<Node<?>> builder();
383 NodeList nodes = element.getChildNodes();
384 boolean isSimpleObject = true;
386 for (int i = 0; i < nodes.getLength(); i++) {
387 org.w3c.dom.Node child = nodes.item(i);
388 if (child instanceof Element) {
389 isSimpleObject = false;
390 values.add(toDomNode((Element) child));
392 if (isSimpleObject && child instanceof org.w3c.dom.Text) {
393 value = element.getTextContent();
394 if (!Strings.isNullOrEmpty(value)) {
395 isSimpleObject = true;
399 if (isSimpleObject) {
400 return new SimpleNodeTOImpl<>(qname, null, value);
402 return ImmutableCompositeNode.create(qname, values.build());
405 public static List<Node<?>> toDomNodes(final Element element, final Optional<Set<DataSchemaNode>> context) {
406 return forEachChild(element.getChildNodes(), new Function<Element, Optional<Node<?>>>() {
409 public Optional<Node<?>> apply(Element input) {
410 if (context.isPresent()) {
411 QName partialQName = qNameFromElement(input);
412 Optional<DataSchemaNode> schemaNode = findFirstSchema(partialQName, context.get());
413 if (schemaNode.isPresent()) {
414 return Optional.<Node<?>> fromNullable(//
415 toNodeWithSchema(input, schemaNode.get(), DEFAULT_XML_VALUE_CODEC_PROVIDER));
418 return Optional.<Node<?>> fromNullable(toDomNode(element));
425 private static final <T> List<T> forEachChild(NodeList nodes, Function<Element, Optional<T>> forBody) {
426 ImmutableList.Builder<T> ret = ImmutableList.<T> builder();
427 for (int i = 0; i < nodes.getLength(); i++) {
428 org.w3c.dom.Node child = nodes.item(i);
429 if (child instanceof Element) {
430 Optional<T> result = forBody.apply((Element) child);
431 if (result.isPresent()) {
432 ret.add(result.get());
439 public static final XmlCodecProvider defaultValueCodecProvider() {
440 return DEFAULT_XML_VALUE_CODEC_PROVIDER;