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 com.google.common.annotations.VisibleForTesting;
11 import javax.xml.stream.XMLStreamException;
12 import org.eclipse.jdt.annotation.NonNull;
13 import org.opendaylight.yangtools.yang.common.QName;
14 import org.opendaylight.yangtools.yang.common.QNameModule;
15 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
16 import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
17 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
18 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
19 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
20 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
21 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
22 import org.slf4j.Logger;
23 import org.slf4j.LoggerFactory;
26 * Utility class for bridging JAXP Stream and YANG Data APIs. Note that the definition of this class
27 * by no means final and subject to change as more functionality is centralized here.
29 abstract class XMLStreamWriterUtils {
30 private static final Logger LOG = LoggerFactory.getLogger(XMLStreamWriterUtils.class);
33 * Encode a value into a String in the context of a XML stream writer. This method assumes the start and end of
34 * element is emitted by the caller.
36 * @param writer XML Stream writer
37 * @param schemaNode Schema node that describes the value
38 * @param type Schema type definition
39 * @param value data value
40 * @param parent module QName owning the leaf definition
41 * @return String characters to be written
42 * @throws XMLStreamException if an encoding problem occurs
44 String encodeValue(final @NonNull ValueWriter writer,final @NonNull SchemaNode schemaNode,
45 final TypeDefinition<?> type, final @NonNull Object value, final QNameModule parent)
46 throws XMLStreamException {
47 return type instanceof LeafrefTypeDefinition
48 ? encodeValue(writer, getBaseTypeForLeafRef(schemaNode, (LeafrefTypeDefinition) type), value, parent)
49 : encodeValue(writer, type, value, parent);
53 * Write a value into a XML stream writer. This method assumes the start and end of element is
54 * emitted by the caller.
56 * @param writer XML Stream writer
57 * @param type data type. In case of leaf ref this should be the type of leaf being referenced
58 * @param value data value
59 * @param parent optional parameter of a module QName owning the leaf definition
60 * @return String characters to be written
61 * @throws XMLStreamException if an encoding problem occurs
63 private String encodeValue(final @NonNull ValueWriter writer, final @NonNull TypeDefinition<?> type,
64 final @NonNull Object value, final QNameModule parent) throws XMLStreamException {
65 if (type instanceof IdentityrefTypeDefinition) {
66 return encode(writer, (IdentityrefTypeDefinition) type, value, parent);
67 } else if (type instanceof InstanceIdentifierTypeDefinition) {
68 return encode(writer, (InstanceIdentifierTypeDefinition) type, value);
70 return serialize(type, value);
74 private static String serialize(final @NonNull TypeDefinition<?> type, final @NonNull Object value) {
75 final TypeDefinitionAwareCodec<Object, ?> codec = TypeDefinitionAwareCodec.from(type);
77 LOG.warn("Failed to find codec for {}, falling back to using stream", type);
78 return value.toString();
82 return codec.serialize(value);
83 } catch (ClassCastException e) {
84 LOG.warn("Provided node value {} did not have type {} required by mapping. Using stream instead.",
86 return value.toString();
91 static String encode(final @NonNull ValueWriter writer, final @NonNull QName qname, final QNameModule parent)
92 throws XMLStreamException {
93 //in case parent is present and same as element namespace write value without namespace
94 if (qname.getNamespace().equals(parent.getNamespace())) {
95 return qname.getLocalName();
98 final String ns = qname.getNamespace().toString();
99 final String prefix = "x";
100 writer.writeNamespace(prefix, ns);
101 return prefix + ':' + qname.getLocalName();
104 private static String encode(final @NonNull ValueWriter writer, final @NonNull IdentityrefTypeDefinition type,
105 final @NonNull Object value, final QNameModule parent) throws XMLStreamException {
106 if (value instanceof QName) {
107 return encode(writer, (QName) value, parent);
110 final QName qname = type.getQName();
111 LOG.debug("Value of {}:{} is not a QName but {}", qname.getNamespace(), qname.getLocalName(), value.getClass());
112 return value.toString();
115 private String encode(final @NonNull ValueWriter writer, final @NonNull InstanceIdentifierTypeDefinition type,
116 final @NonNull Object value) throws XMLStreamException {
117 if (value instanceof YangInstanceIdentifier) {
118 return encodeInstanceIdentifier(writer, (YangInstanceIdentifier)value);
121 final QName qname = type.getQName();
122 LOG.warn("Value of {}:{} is not an InstanceIdentifier but {}", qname.getNamespace(), qname.getLocalName(),
124 return value.toString();
127 abstract @NonNull TypeDefinition<?> getBaseTypeForLeafRef(SchemaNode schemaNode,
128 @NonNull LeafrefTypeDefinition type);
130 abstract String encodeInstanceIdentifier(@NonNull ValueWriter writer, YangInstanceIdentifier value)
131 throws XMLStreamException;