2 * Copyright (c) 2015 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.impl.codec.xml;
11 import com.google.common.annotations.Beta;
12 import com.google.common.annotations.VisibleForTesting;
13 import com.google.common.base.Optional;
14 import com.google.common.base.Preconditions;
16 import java.util.Map.Entry;
17 import javax.annotation.Nonnull;
18 import javax.xml.stream.XMLStreamException;
19 import javax.xml.stream.XMLStreamWriter;
20 import org.opendaylight.yangtools.yang.common.QName;
21 import org.opendaylight.yangtools.yang.common.QNameModule;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
23 import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
24 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
25 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
26 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
27 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
28 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
29 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
30 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
31 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
32 import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
33 import org.slf4j.Logger;
34 import org.slf4j.LoggerFactory;
37 * Utility class for bridging JAXP Stream and YANG Data APIs. Note that the definition of this class
38 * by no means final and subject to change as more functionality is centralized here.
41 public class XmlStreamUtils {
42 private static final Logger LOG = LoggerFactory.getLogger(XmlStreamUtils.class);
43 private final XmlCodecProvider codecProvider;
44 private final Optional<SchemaContext> schemaContext;
46 protected XmlStreamUtils(final XmlCodecProvider codecProvider) {
47 this(codecProvider, null);
50 private XmlStreamUtils(final XmlCodecProvider codecProvider, final SchemaContext schemaContext) {
51 this.codecProvider = Preconditions.checkNotNull(codecProvider);
52 this.schemaContext = Optional.fromNullable(schemaContext);
56 * Create a new instance encapsulating a particular codec provider.
58 * @param codecProvider XML codec provider
59 * @return A new instance
61 public static XmlStreamUtils create(final XmlCodecProvider codecProvider) {
62 return new XmlStreamUtils(codecProvider);
66 static void writeAttribute(final XMLStreamWriter writer, final Entry<QName, String> attribute, final RandomPrefix randomPrefix)
67 throws XMLStreamException {
68 final QName key = attribute.getKey();
69 final String prefix = randomPrefix.encodePrefix(key.getNamespace());
70 writer.writeAttribute("xmlns:" + prefix, key.getNamespace().toString());
71 writer.writeAttribute(prefix, key.getNamespace().toString(), key.getLocalName(), attribute.getValue());
75 * Write a value into a XML stream writer. This method assumes the start and end of element is
76 * emitted by the caller.
78 * @param writer XML Stream writer
79 * @param schemaNode Schema node that describes the value
80 * @param value data value
81 * @param parent optional parameter of a module QName owning the leaf definition
82 * @throws XMLStreamException if an encoding problem occurs
84 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
86 LOG.debug("Value of {}:{} is null, not encoding it", schemaNode.getQName().getNamespace(), schemaNode.getQName().getLocalName());
90 Preconditions.checkArgument(schemaNode instanceof LeafSchemaNode || schemaNode instanceof LeafListSchemaNode,
91 "Unable to write value for node %s, only nodes of type: leaf and leaf-list can be written at this point", schemaNode.getQName());
93 TypeDefinition<?> type = schemaNode instanceof LeafSchemaNode ?
94 ((LeafSchemaNode) schemaNode).getType():
95 ((LeafListSchemaNode) schemaNode).getType();
97 TypeDefinition<?> baseType = XmlUtils.resolveBaseTypeFrom(type);
99 if (schemaContext.isPresent() && baseType instanceof LeafrefTypeDefinition) {
100 LeafrefTypeDefinition leafrefTypeDefinition = (LeafrefTypeDefinition) baseType;
101 baseType = SchemaContextUtil.getBaseTypeForLeafRef(leafrefTypeDefinition, schemaContext.get(), schemaNode);
104 writeValue(writer, baseType, value, parent);
107 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value) throws XMLStreamException {
108 writeValue(writer, schemaNode, value, Optional.<QNameModule>absent());
111 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value, final QNameModule parent) throws XMLStreamException {
112 writeValue(writer, schemaNode, value, Optional.of(parent));
116 * Write a value into a XML stream writer. This method assumes the start and end of element is
117 * emitted by the caller.
119 * @param writer XML Stream writer
120 * @param type data type. In case of leaf ref this should be the type of leaf being referenced
121 * @param value data value
122 * @param parent optional parameter of a module QName owning the leaf definition
123 * @throws XMLStreamException if an encoding problem occurs
125 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
127 LOG.debug("Value of {}:{} is null, not encoding it", type.getQName().getNamespace(), type.getQName().getLocalName());
130 TypeDefinition<?> baseType = XmlUtils.resolveBaseTypeFrom(type);
132 if (baseType instanceof IdentityrefTypeDefinition) {
133 if (parent.isPresent()) {
134 write(writer, (IdentityrefTypeDefinition) baseType, value, parent);
136 write(writer, (IdentityrefTypeDefinition) baseType, value, Optional.<QNameModule>absent());
138 } else if (baseType instanceof InstanceIdentifierTypeDefinition) {
139 write(writer, (InstanceIdentifierTypeDefinition) baseType, value);
141 final TypeDefinitionAwareCodec<Object, ?> codec = codecProvider.codecFor(type);
145 text = codec.serialize(value);
146 } catch (ClassCastException e) {
147 LOG.error("Provided node value {} did not have type {} required by mapping. Using stream instead.", value, type, e);
148 text = String.valueOf(value);
151 LOG.error("Failed to find codec for {}, falling back to using stream", type);
152 text = String.valueOf(value);
154 writer.writeCharacters(text);
158 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value, final QNameModule parent) throws XMLStreamException {
159 writeValue(writer, type, value, Optional.of(parent));
162 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value) throws XMLStreamException {
163 writeValue(writer, type, value, Optional.<QNameModule>absent());
167 static void write(@Nonnull final XMLStreamWriter writer, @Nonnull final IdentityrefTypeDefinition type, @Nonnull final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
168 if (value instanceof QName) {
169 final QName qname = (QName) value;
170 final String prefix = "x";
172 //in case parent is present and same as element namespace write value without namespace
173 if (parent.isPresent() && qname.getNamespace().equals(parent.get().getNamespace())){
174 writer.writeCharacters(qname.getLocalName());
176 final String ns = qname.getNamespace().toString();
177 writer.writeNamespace(prefix, ns);
178 writer.writeCharacters(prefix + ':' + qname.getLocalName());
182 LOG.debug("Value of {}:{} is not a QName but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
183 writer.writeCharacters(String.valueOf(value));
187 private void write(@Nonnull final XMLStreamWriter writer, @Nonnull final InstanceIdentifierTypeDefinition type, @Nonnull final Object value) throws XMLStreamException {
188 if (value instanceof YangInstanceIdentifier) {
189 writeInstanceIdentifier(writer, (YangInstanceIdentifier)value);
191 LOG.warn("Value of {}:{} is not an InstanceIdentifier but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
192 writer.writeCharacters(String.valueOf(value));
196 public void writeInstanceIdentifier(final XMLStreamWriter writer, final YangInstanceIdentifier value) throws XMLStreamException {
197 if(schemaContext.isPresent()) {
198 RandomPrefixInstanceIdentifierSerializer iiCodec = new RandomPrefixInstanceIdentifierSerializer(schemaContext.get());
199 String serializedValue = iiCodec.serialize(value);
200 writeNamespaceDeclarations(writer,iiCodec.getPrefixes());
201 writer.writeCharacters(serializedValue);
203 LOG.warn("Schema context not present in {}, serializing {} without schema.",this,value);
204 writeInstanceIdentifier(writer, value);
208 private static void writeNamespaceDeclarations(final XMLStreamWriter writer, final Iterable<Entry<URI, String>> prefixes) throws XMLStreamException {
209 for (Entry<URI, String> e: prefixes) {
210 final String ns = e.getKey().toString();
211 final String p = e.getValue();
212 writer.writeNamespace(p, ns);
216 public static XmlStreamUtils create(final XmlCodecProvider codecProvider, final SchemaContext schemaContext) {
217 return new XmlStreamUtils(codecProvider, schemaContext);