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;
47 * @deprecated Use {@link #create(XmlCodecProvider)} instead. This method will be hidden and the class
48 * made final in a future release.
51 protected XmlStreamUtils(final XmlCodecProvider codecProvider) {
52 this(codecProvider, null);
55 private XmlStreamUtils(final XmlCodecProvider codecProvider, final SchemaContext schemaContext) {
56 this.codecProvider = Preconditions.checkNotNull(codecProvider);
57 this.schemaContext = Optional.fromNullable(schemaContext);
61 * Create a new instance encapsulating a particular codec provider.
63 * @param codecProvider XML codec provider
64 * @return A new instance
66 public static XmlStreamUtils create(final XmlCodecProvider codecProvider) {
67 return new XmlStreamUtils(codecProvider, null);
70 public static XmlStreamUtils create(final XmlCodecProvider codecProvider, final SchemaContext schemaContext) {
71 return new XmlStreamUtils(codecProvider, schemaContext);
75 static void writeAttribute(final XMLStreamWriter writer, final Entry<QName, String> attribute, final RandomPrefix randomPrefix)
76 throws XMLStreamException {
77 final QName key = attribute.getKey();
78 final String prefix = randomPrefix.encodePrefix(key.getNamespace());
79 writer.writeAttribute("xmlns:" + prefix, key.getNamespace().toString());
80 writer.writeAttribute(prefix, key.getNamespace().toString(), key.getLocalName(), attribute.getValue());
84 * Write a value into a XML stream writer. This method assumes the start and end of element is
85 * emitted by the caller.
87 * @param writer XML Stream writer
88 * @param schemaNode Schema node that describes the value
89 * @param value data value
90 * @param parent optional parameter of a module QName owning the leaf definition
91 * @throws XMLStreamException if an encoding problem occurs
93 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
95 LOG.debug("Value of {}:{} is null, not encoding it", schemaNode.getQName().getNamespace(), schemaNode.getQName().getLocalName());
99 Preconditions.checkArgument(schemaNode instanceof LeafSchemaNode || schemaNode instanceof LeafListSchemaNode,
100 "Unable to write value for node %s, only nodes of type: leaf and leaf-list can be written at this point", schemaNode.getQName());
102 TypeDefinition<?> type = schemaNode instanceof LeafSchemaNode ?
103 ((LeafSchemaNode) schemaNode).getType():
104 ((LeafListSchemaNode) schemaNode).getType();
106 TypeDefinition<?> baseType = XmlUtils.resolveBaseTypeFrom(type);
108 if (schemaContext.isPresent() && baseType instanceof LeafrefTypeDefinition) {
109 LeafrefTypeDefinition leafrefTypeDefinition = (LeafrefTypeDefinition) baseType;
110 baseType = SchemaContextUtil.getBaseTypeForLeafRef(leafrefTypeDefinition, schemaContext.get(), schemaNode);
113 writeValue(writer, baseType, value, parent);
116 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value) throws XMLStreamException {
117 writeValue(writer, schemaNode, value, Optional.<QNameModule>absent());
120 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value, final QNameModule parent) throws XMLStreamException {
121 writeValue(writer, schemaNode, value, Optional.of(parent));
125 * Write a value into a XML stream writer. This method assumes the start and end of element is
126 * emitted by the caller.
128 * @param writer XML Stream writer
129 * @param type data type. In case of leaf ref this should be the type of leaf being referenced
130 * @param value data value
131 * @param parent optional parameter of a module QName owning the leaf definition
132 * @throws XMLStreamException if an encoding problem occurs
134 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
136 LOG.debug("Value of {}:{} is null, not encoding it", type.getQName().getNamespace(), type.getQName().getLocalName());
139 TypeDefinition<?> baseType = XmlUtils.resolveBaseTypeFrom(type);
141 if (baseType instanceof IdentityrefTypeDefinition) {
142 if (parent.isPresent()) {
143 write(writer, (IdentityrefTypeDefinition) baseType, value, parent);
145 write(writer, (IdentityrefTypeDefinition) baseType, value, Optional.<QNameModule>absent());
147 } else if (baseType instanceof InstanceIdentifierTypeDefinition) {
148 write(writer, (InstanceIdentifierTypeDefinition) baseType, value);
150 final TypeDefinitionAwareCodec<Object, ?> codec = codecProvider.codecFor(type);
154 text = codec.serialize(value);
155 } catch (ClassCastException e) {
156 LOG.error("Provided node value {} did not have type {} required by mapping. Using stream instead.", value, type, e);
157 text = String.valueOf(value);
160 LOG.error("Failed to find codec for {}, falling back to using stream", type);
161 text = String.valueOf(value);
163 writer.writeCharacters(text);
167 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value, final QNameModule parent) throws XMLStreamException {
168 writeValue(writer, type, value, Optional.of(parent));
171 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value) throws XMLStreamException {
172 writeValue(writer, type, value, Optional.<QNameModule>absent());
176 static void write(@Nonnull final XMLStreamWriter writer, @Nonnull final IdentityrefTypeDefinition type, @Nonnull final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
177 if (value instanceof QName) {
178 final QName qname = (QName) value;
179 final String prefix = "x";
181 //in case parent is present and same as element namespace write value without namespace
182 if (parent.isPresent() && qname.getNamespace().equals(parent.get().getNamespace())){
183 writer.writeCharacters(qname.getLocalName());
185 final String ns = qname.getNamespace().toString();
186 writer.writeNamespace(prefix, ns);
187 writer.writeCharacters(prefix + ':' + qname.getLocalName());
191 LOG.debug("Value of {}:{} is not a QName but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
192 writer.writeCharacters(String.valueOf(value));
196 private void write(@Nonnull final XMLStreamWriter writer, @Nonnull final InstanceIdentifierTypeDefinition type, @Nonnull final Object value) throws XMLStreamException {
197 if (value instanceof YangInstanceIdentifier) {
198 writeInstanceIdentifier(writer, (YangInstanceIdentifier)value);
200 LOG.warn("Value of {}:{} is not an InstanceIdentifier but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
201 writer.writeCharacters(String.valueOf(value));
205 public void writeInstanceIdentifier(final XMLStreamWriter writer, final YangInstanceIdentifier value) throws XMLStreamException {
206 if(schemaContext.isPresent()) {
207 RandomPrefixInstanceIdentifierSerializer iiCodec = new RandomPrefixInstanceIdentifierSerializer(schemaContext.get());
208 String serializedValue = iiCodec.serialize(value);
209 writeNamespaceDeclarations(writer,iiCodec.getPrefixes());
210 writer.writeCharacters(serializedValue);
212 LOG.warn("Schema context not present in {}, serializing {} without schema.",this,value);
213 writeInstanceIdentifier(writer, value);
217 private static void writeNamespaceDeclarations(final XMLStreamWriter writer, final Iterable<Entry<URI, String>> prefixes) throws XMLStreamException {
218 for (Entry<URI, String> e: prefixes) {
219 final String ns = e.getKey().toString();
220 final String p = e.getValue();
221 writer.writeNamespace(p, ns);