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;
12 import java.util.concurrent.ConcurrentHashMap;
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.type.IdentityrefTypeDefinition;
22 import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
23 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
28 * Utility class for bridging JAXP Stream and YANG Data APIs. Note that the definition of this class
29 * by no means final and subject to change as more functionality is centralized here.
31 abstract class XMLStreamWriterUtils {
32 private static final Logger LOG = LoggerFactory.getLogger(XMLStreamWriterUtils.class);
34 * Warn-once set of identityref nodes which were found to be normalized to a different object than a QName.
36 private static final Set<QName> IDENTITYREF_WARNED = ConcurrentHashMap.newKeySet();
39 * Encode a value into a String in the context of a XML stream writer. This method assumes the start and end of
40 * element is emitted by the caller.
42 * @param writer XML Stream writer
43 * @param schemaNode Schema node that describes the value
44 * @param type Schema type definition
45 * @param value data value
46 * @param parent module QName owning the leaf definition
47 * @return String characters to be written
48 * @throws XMLStreamException if an encoding problem occurs
50 String encodeValue(final @NonNull ValueWriter writer,final @NonNull SchemaNode schemaNode,
51 final TypeDefinition<?> type, final @NonNull Object value, final QNameModule parent)
52 throws XMLStreamException {
53 return type instanceof LeafrefTypeDefinition
54 ? encodeValue(writer, getBaseTypeForLeafRef(schemaNode, (LeafrefTypeDefinition) type), value, parent)
55 : encodeValue(writer, type, value, parent);
59 * Write a value into a XML stream writer. This method assumes the start and end of element is
60 * emitted by the caller.
62 * @param writer XML Stream writer
63 * @param type data type. In case of leaf ref this should be the type of leaf being referenced
64 * @param value data value
65 * @param parent optional parameter of a module QName owning the leaf definition
66 * @return String characters to be written
67 * @throws XMLStreamException if an encoding problem occurs
69 private String encodeValue(final @NonNull ValueWriter writer, final @NonNull TypeDefinition<?> type,
70 final @NonNull Object value, final QNameModule parent) throws XMLStreamException {
71 if (type instanceof IdentityrefTypeDefinition) {
72 return encode(writer, (IdentityrefTypeDefinition) type, value, parent);
73 } else if (type instanceof InstanceIdentifierTypeDefinition) {
74 return encode(writer, (InstanceIdentifierTypeDefinition) type, value);
76 return 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 String encode(final @NonNull ValueWriter writer, final @NonNull QName qname, final QNameModule parent)
98 throws XMLStreamException {
99 //in case parent is present and same as element namespace write value without namespace
100 if (qname.getNamespace().equals(parent.getNamespace())) {
101 return qname.getLocalName();
104 final String ns = qname.getNamespace().toString();
105 final String prefix = "x";
106 writer.writeNamespace(prefix, ns);
107 return prefix + ':' + qname.getLocalName();
110 private static String encode(final @NonNull ValueWriter writer, final @NonNull IdentityrefTypeDefinition type,
111 final @NonNull Object value, final QNameModule parent) throws XMLStreamException {
112 if (value instanceof QName) {
113 return encode(writer, (QName) value, parent);
116 final QName qname = type.getQName();
117 if (IDENTITYREF_WARNED.add(qname)) {
118 LOG.warn("Value of {}:{} is not a QName but {}. Please the source of this data", qname.getNamespace(),
119 qname.getLocalName(), value.getClass(), new Throwable());
121 return value.toString();
124 private String encode(final @NonNull ValueWriter writer, final @NonNull InstanceIdentifierTypeDefinition type,
125 final @NonNull Object value) throws XMLStreamException {
126 if (value instanceof YangInstanceIdentifier) {
127 return encodeInstanceIdentifier(writer, (YangInstanceIdentifier)value);
130 final QName qname = type.getQName();
131 LOG.warn("Value of {}:{} is not an InstanceIdentifier but {}", qname.getNamespace(), qname.getLocalName(),
133 return value.toString();
136 abstract @NonNull TypeDefinition<?> getBaseTypeForLeafRef(SchemaNode schemaNode,
137 @NonNull LeafrefTypeDefinition type);
139 abstract String encodeInstanceIdentifier(@NonNull ValueWriter writer, YangInstanceIdentifier value)
140 throws XMLStreamException;