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.jaxen;
10 import com.google.common.base.Joiner;
11 import com.google.common.base.Optional;
12 import com.google.common.base.Preconditions;
13 import com.google.common.base.Verify;
14 import com.google.common.collect.Iterators;
15 import com.google.common.collect.UnmodifiableIterator;
16 import com.google.common.io.BaseEncoding;
17 import java.util.AbstractMap.SimpleImmutableEntry;
18 import java.util.Iterator;
20 import java.util.Map.Entry;
21 import java.util.NoSuchElementException;
23 import org.jaxen.DefaultNavigator;
24 import org.jaxen.NamedAccessNavigator;
25 import org.jaxen.Navigator;
26 import org.jaxen.UnsupportedAxisException;
27 import org.jaxen.XPath;
28 import org.jaxen.saxpath.SAXPathException;
29 import org.opendaylight.yangtools.yang.common.QName;
30 import org.opendaylight.yangtools.yang.common.QNameModule;
31 import org.opendaylight.yangtools.yang.data.api.AttributesContainer;
32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
33 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
34 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
35 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
36 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
37 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
38 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
41 * A {@link Navigator} implementation for YANG XPaths instantiated on a particular root {@link NormalizedNode}.
43 final class NormalizedNodeNavigator extends DefaultNavigator implements NamedAccessNavigator {
44 private static final long serialVersionUID = 1L;
45 private static final Joiner JOINER = Joiner.on(" ").skipNulls();
46 private final ConverterNamespaceContext namespaceContext;
47 private final JaxenDocument document;
49 NormalizedNodeNavigator(final ConverterNamespaceContext context, final JaxenDocument document) {
50 this.namespaceContext = Preconditions.checkNotNull(context);
51 this.document = document;
54 private static NormalizedNodeContext cast(final Object context) {
55 Verify.verify(context instanceof NormalizedNodeContext, "Unhandled context node %s", context);
56 return (NormalizedNodeContext) context;
59 private static NormalizedNode<?, ?> contextNode(final Object context) {
60 return cast(context).getNode();
63 private QName resolveQName(final NormalizedNode<?, ?> node, final String prefix, final String localName) {
64 final QNameModule module;
65 if (prefix.isEmpty()) {
66 module = node.getNodeType().getModule();
68 module = namespaceContext.convert(prefix);
71 return QName.create(module, localName);
74 @SuppressWarnings("unchecked")
75 private static Entry<QName, String> attribute(final Object attr) {
76 Verify.verify(attr instanceof Entry, "Unhandled attribute %s", attr);
77 return (Entry<QName, String>) attr;
81 public String getElementNamespaceUri(final Object element) {
82 return contextNode(element).getNodeType().getNamespace().toString();
86 public String getElementName(final Object element) {
87 return contextNode(element).getNodeType().getLocalName();
91 public String getElementQName(final Object element) {
92 return namespaceContext.jaxenQName(contextNode(element).getNodeType());
96 public String getAttributeNamespaceUri(final Object attr) {
97 return attribute(attr).getKey().getNamespace().toString();
101 public String getAttributeName(final Object attr) {
102 return attribute(attr).getKey().getLocalName();
106 public String getAttributeQName(final Object attr) {
107 return namespaceContext.jaxenQName(attribute(attr).getKey());
111 public NormalizedNodeContext getDocumentNode(final Object contextNode) {
112 NormalizedNodeContext ctx = cast(contextNode);
113 while (ctx.getParent() != null) {
114 ctx = ctx.getParent();
121 public boolean isDocument(final Object object) {
122 return cast(object).getParent() == null;
126 public boolean isElement(final Object object) {
127 return object instanceof NormalizedNodeContext;
131 public boolean isAttribute(final Object object) {
132 return object instanceof Entry;
136 public boolean isNamespace(final Object object) {
141 public boolean isComment(final Object object) {
146 public boolean isText(final Object object) {
147 return object instanceof String;
151 public boolean isProcessingInstruction(final Object object) {
156 public String getCommentStringValue(final Object comment) {
157 throw new UnsupportedOperationException();
161 public String getElementStringValue(final Object element) {
162 final NormalizedNode<?, ?> node = contextNode(element);
163 if (node instanceof LeafNode || node instanceof LeafSetEntryNode) {
164 final Object value = node.getValue();
166 // TODO: This is a rather poor approximation of what the codec infrastructure, but it should be sufficient
167 // to work for now. Tracking SchemaPath will mean we will need to wrap each NormalizedNode with a
168 // corresponding SchemaPath. That in turn would complicate this class and result in a lot of object
170 if (value instanceof byte[]) {
172 return BaseEncoding.base64().encode((byte[]) value);
174 if (value instanceof Set) {
176 return JOINER.join((Set<?>)value);
179 // Everything else...
180 return String.valueOf(value);
188 public String getAttributeStringValue(final Object attr) {
189 return attribute(attr).getValue();
193 public String getNamespaceStringValue(final Object ns) {
194 throw new UnsupportedOperationException();
198 public String getTextStringValue(final Object text) {
199 return text.toString();
203 public String getNamespacePrefix(final Object ns) {
204 throw new UnsupportedOperationException();
208 public XPath parseXPath(final String xpath) throws SAXPathException {
209 // FIXME: need to bind YangXPath probably
210 throw new UnsupportedOperationException();
214 public Iterator<NormalizedNodeContext> getChildAxisIterator(final Object contextNode, final String localName,
215 final String namespacePrefix, final String namespaceURI) {
216 final NormalizedNodeContext ctx = cast(contextNode);
217 final NormalizedNode<?, ?> node = ctx.getNode();
218 if (!(node instanceof DataContainerNode)) {
222 final QName qname = resolveQName(node, namespacePrefix, localName);
223 @SuppressWarnings({ "unchecked", "rawtypes" })
224 final Optional<NormalizedNode<?, ?>> maybeChild = ((DataContainerNode)node).getChild(new NodeIdentifier(qname));
225 if (!maybeChild.isPresent()) {
229 // The child may be a structural node
230 final NormalizedNode<?, ?> child = maybeChild.get();
231 if (child instanceof MapNode) {
232 return Iterators.transform(((MapNode)child).getValue().iterator(), ctx);
234 if (child instanceof LeafSetNode) {
235 return Iterators.transform(((LeafSetNode<?>)child).getValue().iterator(), ctx);
238 return Iterators.singletonIterator(ctx.apply(child));
242 public Iterator<? extends Entry<?, ?>> getAttributeAxisIterator(final Object contextNode, final String localName, final String namespacePrefix,
243 final String namespaceURI) {
244 final NormalizedNode<?, ?> node = contextNode(contextNode);
245 if (node instanceof AttributesContainer) {
246 final Map<QName, String> attributes = ((AttributesContainer) node).getAttributes();
247 if (attributes.isEmpty()) {
251 final QName qname = resolveQName(node, namespacePrefix, localName);
252 final String value = attributes.get(qname);
253 return value == null ? null : Iterators.singletonIterator(new SimpleImmutableEntry<>(qname, value));
260 public Iterator<NormalizedNodeContext> getChildAxisIterator(final Object contextNode) {
261 final NormalizedNodeContext ctx = cast(contextNode);
262 final NormalizedNode<?, ?> node = ctx.getNode();
263 if (node instanceof DataContainerNode) {
264 return Iterators.transform(((DataContainerNode<?>) node).getValue().iterator(), ctx);
271 public Iterator<NormalizedNodeContext> getParentAxisIterator(final Object contextNode) {
272 final NormalizedNodeContext parent = cast(contextNode).getParent();
273 return parent == null ? null : Iterators.singletonIterator(parent);
277 public Iterator<NormalizedNodeContext> getAncestorAxisIterator(final Object contextNode) throws UnsupportedAxisException {
278 final NormalizedNodeContext parent = cast(contextNode).getParent();
279 return parent == null ? null : new NormalizedNodeContextIterator(parent);
283 public Iterator<? extends Entry<?, ?>> getAttributeAxisIterator(final Object contextNode) {
284 final NormalizedNode<?, ?> node = contextNode(contextNode);
285 if (node instanceof AttributesContainer) {
286 final Map<QName, String> attributes = ((AttributesContainer) node).getAttributes();
287 if (attributes.isEmpty()) {
291 return attributes.entrySet().iterator();
298 public Iterator<NormalizedNodeContext> getSelfAxisIterator(final Object contextNode) throws UnsupportedAxisException {
299 return Iterators.singletonIterator(cast(contextNode));
303 public Iterator<NormalizedNodeContext> getAncestorOrSelfAxisIterator(final Object contextNode) throws UnsupportedAxisException {
304 return new NormalizedNodeContextIterator(cast(contextNode));
308 public NormalizedNodeContext getParentNode(final Object contextNode) throws UnsupportedAxisException {
309 return cast(contextNode).getParent();
312 NormalizedNode<?, ?> getRootNode() {
313 return document.getRootNode();
316 private static final class NormalizedNodeContextIterator extends UnmodifiableIterator<NormalizedNodeContext> {
317 private NormalizedNodeContext next;
319 NormalizedNodeContextIterator(final NormalizedNodeContext initial) {
320 this.next = Preconditions.checkNotNull(initial);
324 public boolean hasNext() {
329 public NormalizedNodeContext next() {
331 throw new NoSuchElementException();
334 final NormalizedNodeContext ret = next;
335 next = next.getParent();