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
8 package org.opendaylight.yangtools.yang.data.codec.xml;
10 import static com.google.common.base.Preconditions.checkArgument;
12 import com.google.common.annotations.VisibleForTesting;
13 import javax.xml.stream.XMLStreamException;
14 import org.eclipse.jdt.annotation.NonNull;
15 import org.opendaylight.yangtools.yang.common.QName;
16 import org.opendaylight.yangtools.yang.common.QNameModule;
17 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
18 import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
19 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
20 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
21 import org.opendaylight.yangtools.yang.model.api.TypedDataSchemaNode;
22 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
23 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
24 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
29 * Utility class for bridging JAXP Stream and YANG Data APIs. Note that the definition of this class
30 * by no means final and subject to change as more functionality is centralized here.
32 abstract class XMLStreamWriterUtils {
33 private static final Logger LOG = LoggerFactory.getLogger(XMLStreamWriterUtils.class);
36 * Write a value into a XML stream writer. This method assumes the start and end of element is
37 * emitted by the caller.
39 * @param writer XML Stream writer
40 * @param schemaNode Schema node that describes the value
41 * @param value data value
42 * @param parent module QName owning the leaf definition
43 * @throws XMLStreamException if an encoding problem occurs
45 void writeValue(final @NonNull ValueWriter writer, final @NonNull SchemaNode schemaNode,
46 final @NonNull Object value, final QNameModule parent) throws XMLStreamException {
47 checkArgument(schemaNode instanceof TypedDataSchemaNode,
48 "Unable to write value for node %s, only nodes of type: leaf and leaf-list can be written at this point",
49 schemaNode.getQName());
51 TypeDefinition<?> type = ((TypedDataSchemaNode) schemaNode).getType();
52 if (type instanceof LeafrefTypeDefinition) {
53 type = getBaseTypeForLeafRef(schemaNode, (LeafrefTypeDefinition) type);
56 writeValue(writer, type, value, parent);
60 * Write a value into a XML stream writer. This method assumes the start and end of element is
61 * emitted by the caller.
63 * @param writer XML Stream writer
64 * @param type data type. In case of leaf ref this should be the type of leaf being referenced
65 * @param value data value
66 * @param parent optional parameter of a module QName owning the leaf definition
67 * @throws XMLStreamException if an encoding problem occurs
69 private void writeValue(final @NonNull ValueWriter writer, final @NonNull TypeDefinition<?> type,
70 final @NonNull Object value, final QNameModule parent) throws XMLStreamException {
71 if (type instanceof IdentityrefTypeDefinition) {
72 write(writer, (IdentityrefTypeDefinition) type, value, parent);
73 } else if (type instanceof InstanceIdentifierTypeDefinition) {
74 write(writer, (InstanceIdentifierTypeDefinition) type, value);
76 writer.writeCharacters(serialize(type, value));
80 private static String serialize(final @NonNull TypeDefinition<?> type, final @NonNull Object value) {
81 final TypeDefinitionAwareCodec<Object, ?> codec = TypeDefinitionAwareCodec.from(type);
83 LOG.warn("Failed to find codec for {}, falling back to using stream", type);
84 return value.toString();
88 return codec.serialize(value);
89 } catch (ClassCastException e) {
90 LOG.warn("Provided node value {} did not have type {} required by mapping. Using stream instead.",
92 return value.toString();
97 static void write(final @NonNull ValueWriter writer, final @NonNull IdentityrefTypeDefinition type,
98 final @NonNull Object value, final QNameModule parent) throws XMLStreamException {
99 if (value instanceof QName) {
100 final QName qname = (QName) value;
102 //in case parent is present and same as element namespace write value without namespace
103 if (qname.getNamespace().equals(parent.getNamespace())) {
104 writer.writeCharacters(qname.getLocalName());
106 final String ns = qname.getNamespace().toString();
107 final String prefix = "x";
108 writer.writeNamespace(prefix, ns);
109 writer.writeCharacters(prefix + ':' + qname.getLocalName());
112 final QName qname = type.getQName();
113 LOG.debug("Value of {}:{} is not a QName but {}", qname.getNamespace(), qname.getLocalName(),
115 writer.writeToStringCharacters(value);
119 private void write(final @NonNull ValueWriter writer, final @NonNull InstanceIdentifierTypeDefinition type,
120 final @NonNull Object value) throws XMLStreamException {
121 if (value instanceof YangInstanceIdentifier) {
122 writeInstanceIdentifier(writer, (YangInstanceIdentifier)value);
124 final QName qname = type.getQName();
125 LOG.warn("Value of {}:{} is not an InstanceIdentifier but {}", qname.getNamespace(), qname.getLocalName(),
127 writer.writeToStringCharacters(value);
131 abstract @NonNull TypeDefinition<?> getBaseTypeForLeafRef(SchemaNode schemaNode,
132 @NonNull LeafrefTypeDefinition type);
134 abstract void writeInstanceIdentifier(@NonNull ValueWriter writer, YangInstanceIdentifier value)
135 throws XMLStreamException;