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;
15 import com.google.common.base.Verify;
17 import java.util.Map.Entry;
18 import javax.annotation.Nonnull;
19 import javax.xml.stream.XMLStreamException;
20 import javax.xml.stream.XMLStreamWriter;
21 import org.opendaylight.yangtools.yang.common.QName;
22 import org.opendaylight.yangtools.yang.common.QNameModule;
23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
24 import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
25 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
26 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
27 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
28 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
29 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
30 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
31 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
32 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
33 import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
34 import org.slf4j.Logger;
35 import org.slf4j.LoggerFactory;
38 * Utility class for bridging JAXP Stream and YANG Data APIs. Note that the definition of this class
39 * by no means final and subject to change as more functionality is centralized here.
42 public final class XmlStreamUtils {
43 private static final Logger LOG = LoggerFactory.getLogger(XmlStreamUtils.class);
44 private final XmlCodecProvider codecProvider;
45 private final Optional<SchemaContext> schemaContext;
47 private XmlStreamUtils(final XmlCodecProvider codecProvider, final SchemaContext schemaContext) {
48 this.codecProvider = Preconditions.checkNotNull(codecProvider);
49 this.schemaContext = Optional.fromNullable(schemaContext);
53 * Create a new instance encapsulating a particular codec provider.
55 * @param codecProvider XML codec provider
56 * @return A new instance
58 public static XmlStreamUtils create(final XmlCodecProvider codecProvider) {
59 return new XmlStreamUtils(codecProvider, null);
62 public static XmlStreamUtils create(final XmlCodecProvider codecProvider, final SchemaContext schemaContext) {
63 return new XmlStreamUtils(codecProvider, schemaContext);
67 static void writeAttribute(final XMLStreamWriter writer, final Entry<QName, String> attribute, final RandomPrefix randomPrefix)
68 throws XMLStreamException {
69 final QName key = attribute.getKey();
70 final String prefix = randomPrefix.encodePrefix(key.getNamespace());
71 writer.writeAttribute("xmlns:" + prefix, key.getNamespace().toString());
72 writer.writeAttribute(prefix, key.getNamespace().toString(), key.getLocalName(), attribute.getValue());
76 * Write a value into a XML stream writer. This method assumes the start and end of element is
77 * emitted by the caller.
79 * @param writer XML Stream writer
80 * @param schemaNode Schema node that describes the value
81 * @param value data value
82 * @param parent optional parameter of a module QName owning the leaf definition
83 * @throws XMLStreamException if an encoding problem occurs
85 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
87 LOG.debug("Value of {}:{} is null, not encoding it", schemaNode.getQName().getNamespace(), schemaNode.getQName().getLocalName());
91 Preconditions.checkArgument(schemaNode instanceof LeafSchemaNode || schemaNode instanceof LeafListSchemaNode,
92 "Unable to write value for node %s, only nodes of type: leaf and leaf-list can be written at this point", schemaNode.getQName());
94 TypeDefinition<?> type = schemaNode instanceof LeafSchemaNode ?
95 ((LeafSchemaNode) schemaNode).getType():
96 ((LeafListSchemaNode) schemaNode).getType();
98 TypeDefinition<?> baseType = XmlUtils.resolveBaseTypeFrom(type);
100 if (schemaContext.isPresent() && baseType instanceof LeafrefTypeDefinition) {
101 LeafrefTypeDefinition leafrefTypeDefinition = (LeafrefTypeDefinition) baseType;
102 baseType = SchemaContextUtil.getBaseTypeForLeafRef(leafrefTypeDefinition, schemaContext.get(), schemaNode);
103 Verify.verifyNotNull(baseType, "Unable to find base type for leafref node '%s'.", schemaNode.getPath());
106 writeValue(writer, baseType, value, parent);
109 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value) throws XMLStreamException {
110 writeValue(writer, schemaNode, value, Optional.absent());
113 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final SchemaNode schemaNode, final Object value, final QNameModule parent) throws XMLStreamException {
114 writeValue(writer, schemaNode, value, Optional.of(parent));
118 * Write a value into a XML stream writer. This method assumes the start and end of element is
119 * emitted by the caller.
121 * @param writer XML Stream writer
122 * @param type data type. In case of leaf ref this should be the type of leaf being referenced
123 * @param value data value
124 * @param parent optional parameter of a module QName owning the leaf definition
125 * @throws XMLStreamException if an encoding problem occurs
127 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
129 LOG.debug("Value of {}:{} is null, not encoding it", type.getQName().getNamespace(), type.getQName().getLocalName());
132 TypeDefinition<?> baseType = XmlUtils.resolveBaseTypeFrom(type);
134 if (baseType instanceof IdentityrefTypeDefinition) {
135 if (parent.isPresent()) {
136 write(writer, (IdentityrefTypeDefinition) baseType, value, parent);
138 write(writer, (IdentityrefTypeDefinition) baseType, value, Optional.absent());
140 } else if (baseType instanceof InstanceIdentifierTypeDefinition) {
141 write(writer, (InstanceIdentifierTypeDefinition) baseType, value);
143 final TypeDefinitionAwareCodec<Object, ?> codec = codecProvider.codecFor(type);
147 text = codec.serialize(value);
148 } catch (ClassCastException e) {
149 LOG.error("Provided node value {} did not have type {} required by mapping. Using stream instead.", value, type, e);
150 text = String.valueOf(value);
153 LOG.error("Failed to find codec for {}, falling back to using stream", type);
154 text = String.valueOf(value);
156 writer.writeCharacters(text);
160 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value, final QNameModule parent) throws XMLStreamException {
161 writeValue(writer, type, value, Optional.of(parent));
164 public void writeValue(@Nonnull final XMLStreamWriter writer, @Nonnull final TypeDefinition<?> type, final Object value) throws XMLStreamException {
165 writeValue(writer, type, value, Optional.absent());
169 static void write(@Nonnull final XMLStreamWriter writer, @Nonnull final IdentityrefTypeDefinition type, @Nonnull final Object value, final Optional<QNameModule> parent) throws XMLStreamException {
170 if (value instanceof QName) {
171 final QName qname = (QName) value;
172 final String prefix = "x";
174 //in case parent is present and same as element namespace write value without namespace
175 if (parent.isPresent() && qname.getNamespace().equals(parent.get().getNamespace())){
176 writer.writeCharacters(qname.getLocalName());
178 final String ns = qname.getNamespace().toString();
179 writer.writeNamespace(prefix, ns);
180 writer.writeCharacters(prefix + ':' + qname.getLocalName());
184 LOG.debug("Value of {}:{} is not a QName but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
185 writer.writeCharacters(String.valueOf(value));
189 private void write(@Nonnull final XMLStreamWriter writer, @Nonnull final InstanceIdentifierTypeDefinition type, @Nonnull final Object value) throws XMLStreamException {
190 if (value instanceof YangInstanceIdentifier) {
191 writeInstanceIdentifier(writer, (YangInstanceIdentifier)value);
193 LOG.warn("Value of {}:{} is not an InstanceIdentifier but {}", type.getQName().getNamespace(), type.getQName().getLocalName(), value.getClass());
194 writer.writeCharacters(String.valueOf(value));
198 public void writeInstanceIdentifier(final XMLStreamWriter writer, final YangInstanceIdentifier value) throws XMLStreamException {
199 if (schemaContext.isPresent()) {
200 RandomPrefixInstanceIdentifierSerializer iiCodec = new RandomPrefixInstanceIdentifierSerializer(schemaContext.get());
201 String serializedValue = iiCodec.serialize(value);
202 writeNamespaceDeclarations(writer,iiCodec.getPrefixes());
203 writer.writeCharacters(serializedValue);
205 LOG.warn("Schema context not present in {}, serializing {} without schema.",this,value);
206 writeInstanceIdentifier(writer, value);
210 private static void writeNamespaceDeclarations(final XMLStreamWriter writer, final Iterable<Entry<URI, String>> prefixes) throws XMLStreamException {
211 for (Entry<URI, String> e: prefixes) {
212 final String ns = e.getKey().toString();
213 final String p = e.getValue();
214 writer.writeNamespace(p, ns);