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 static java.util.Objects.requireNonNull;
12 import com.google.common.base.Joiner;
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;
22 import java.util.Optional;
24 import javax.annotation.Nonnull;
25 import org.jaxen.DefaultNavigator;
26 import org.jaxen.NamedAccessNavigator;
27 import org.jaxen.Navigator;
28 import org.jaxen.UnsupportedAxisException;
29 import org.jaxen.XPath;
30 import org.jaxen.saxpath.SAXPathException;
31 import org.opendaylight.yangtools.yang.common.QName;
32 import org.opendaylight.yangtools.yang.common.QNameModule;
33 import org.opendaylight.yangtools.yang.data.api.AttributesContainer;
34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
35 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
36 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
37 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
38 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
39 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
40 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
41 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
44 * A {@link Navigator} implementation for YANG XPaths instantiated on a particular root {@link NormalizedNode}.
46 final class NormalizedNodeNavigator extends DefaultNavigator implements NamedAccessNavigator {
47 private static final long serialVersionUID = 1L;
48 private static final Joiner JOINER = Joiner.on(" ").skipNulls();
49 private final ConverterNamespaceContext namespaceContext;
50 private final JaxenDocument document;
52 NormalizedNodeNavigator(final ConverterNamespaceContext context, final JaxenDocument document) {
53 this.namespaceContext = requireNonNull(context);
54 this.document = document;
57 private static NormalizedNodeContext cast(final Object context) {
58 Verify.verify(context instanceof NormalizedNodeContext, "Unhandled context node %s", context);
59 return (NormalizedNodeContext) context;
62 private static NormalizedNode<?, ?> contextNode(final Object context) {
63 return cast(context).getNode();
66 private QName resolveQName(final NormalizedNode<?, ?> node, final String prefix, final String localName) {
67 final QNameModule module;
68 if (prefix.isEmpty()) {
69 module = node.getNodeType().getModule();
71 module = namespaceContext.convert(prefix);
74 return QName.create(module, localName);
77 @SuppressWarnings("unchecked")
78 private static Entry<QName, String> attribute(final Object attr) {
79 Verify.verify(attr instanceof Entry, "Unhandled attribute %s", attr);
80 return (Entry<QName, String>) attr;
84 public String getElementNamespaceUri(final Object element) {
85 return contextNode(element).getNodeType().getNamespace().toString();
89 public String getElementName(final Object element) {
90 return contextNode(element).getNodeType().getLocalName();
94 public String getElementQName(final Object element) {
95 return namespaceContext.jaxenQName(contextNode(element).getNodeType());
99 public String getAttributeNamespaceUri(final Object attr) {
100 return attribute(attr).getKey().getNamespace().toString();
104 public String getAttributeName(final Object attr) {
105 return attribute(attr).getKey().getLocalName();
109 public String getAttributeQName(final Object attr) {
110 return namespaceContext.jaxenQName(attribute(attr).getKey());
114 public NormalizedNodeContext getDocumentNode(final Object contextNode) {
115 NormalizedNodeContext ctx = cast(contextNode);
116 while (ctx.getParent() != null) {
117 ctx = ctx.getParent();
124 public boolean isDocument(final Object object) {
125 return cast(object).getParent() == null;
129 public boolean isElement(final Object object) {
130 return object instanceof NormalizedNodeContext;
134 public boolean isAttribute(final Object object) {
135 return object instanceof Entry;
139 public boolean isNamespace(final Object object) {
144 public boolean isComment(final Object object) {
149 public boolean isText(final Object object) {
150 return object instanceof String;
154 public boolean isProcessingInstruction(final Object object) {
159 public String getCommentStringValue(final Object comment) {
160 throw new UnsupportedOperationException();
164 public String getElementStringValue(final Object element) {
165 final NormalizedNode<?, ?> node = contextNode(element);
166 if (node instanceof LeafNode || node instanceof LeafSetEntryNode) {
167 final Object value = node.getValue();
169 // TODO: This is a rather poor approximation of what the codec infrastructure, but it should be sufficient
170 // to work for now. Tracking SchemaPath will mean we will need to wrap each NormalizedNode with a
171 // corresponding SchemaPath. That in turn would complicate this class and result in a lot of object
173 if (value instanceof byte[]) {
175 return BaseEncoding.base64().encode((byte[]) value);
177 if (value instanceof Set) {
179 return JOINER.join((Set<?>)value);
182 // Everything else...
183 return String.valueOf(value);
191 public String getAttributeStringValue(final Object attr) {
192 return attribute(attr).getValue();
196 public String getNamespaceStringValue(final Object ns) {
197 throw new UnsupportedOperationException();
201 public String getTextStringValue(final Object text) {
202 return text.toString();
206 public String getNamespacePrefix(final Object ns) {
207 throw new UnsupportedOperationException();
211 public XPath parseXPath(final String xpath) throws SAXPathException {
212 // FIXME: need to bind YangXPath probably
213 throw new UnsupportedOperationException();
217 public Iterator<NormalizedNodeContext> getChildAxisIterator(final Object contextNode) {
218 final NormalizedNodeContext ctx = cast(contextNode);
219 final NormalizedNode<?, ?> node = ctx.getNode();
220 if (node instanceof DataContainerNode) {
221 return Iterators.transform(((DataContainerNode<?>) node).getValue().iterator(), ctx);
228 public Iterator<NormalizedNodeContext> getChildAxisIterator(final Object contextNode, final String localName,
229 final String namespacePrefix, final String namespaceURI) {
230 final NormalizedNodeContext ctx = cast(contextNode);
231 final NormalizedNode<?, ?> node = ctx.getNode();
232 if (!(node instanceof DataContainerNode)) {
236 final QName qname = resolveQName(node, namespacePrefix, localName);
237 @SuppressWarnings({ "unchecked", "rawtypes" })
238 final Optional<NormalizedNode<?, ?>> maybeChild = ((DataContainerNode)node).getChild(new NodeIdentifier(qname));
239 if (!maybeChild.isPresent()) {
243 // The child may be a structural node
244 final NormalizedNode<?, ?> child = maybeChild.get();
245 if (child instanceof MapNode) {
246 return Iterators.transform(((MapNode)child).getValue().iterator(), ctx);
248 if (child instanceof LeafSetNode) {
249 return Iterators.transform(((LeafSetNode<?>)child).getValue().iterator(), ctx);
252 return Iterators.singletonIterator(ctx.apply(child));
256 public Iterator<? extends Entry<?, ?>> getAttributeAxisIterator(final Object contextNode) {
257 final NormalizedNode<?, ?> node = contextNode(contextNode);
258 if (node instanceof AttributesContainer) {
259 final Map<QName, String> attributes = ((AttributesContainer) node).getAttributes();
260 if (attributes.isEmpty()) {
264 return attributes.entrySet().iterator();
271 public Iterator<? extends Entry<?, ?>> getAttributeAxisIterator(final Object contextNode, final String localName,
272 final String namespacePrefix, final String namespaceURI) {
273 final NormalizedNode<?, ?> node = contextNode(contextNode);
274 if (node instanceof AttributesContainer) {
275 final Map<QName, String> attributes = ((AttributesContainer) node).getAttributes();
276 if (attributes.isEmpty()) {
280 final QName qname = resolveQName(node, namespacePrefix, localName);
281 final String value = attributes.get(qname);
282 return value == null ? null : Iterators.singletonIterator(new SimpleImmutableEntry<>(qname, value));
289 public Iterator<NormalizedNodeContext> getParentAxisIterator(final Object contextNode) {
290 final NormalizedNodeContext parent = cast(contextNode).getParent();
291 return parent == null ? null : Iterators.singletonIterator(parent);
295 public Iterator<NormalizedNodeContext> getAncestorAxisIterator(final Object contextNode)
296 throws UnsupportedAxisException {
297 final NormalizedNodeContext parent = cast(contextNode).getParent();
298 return parent == null ? null : new NormalizedNodeContextIterator(parent);
302 public Iterator<NormalizedNodeContext> getSelfAxisIterator(final Object contextNode)
303 throws UnsupportedAxisException {
304 return Iterators.singletonIterator(cast(contextNode));
308 public Iterator<NormalizedNodeContext> getAncestorOrSelfAxisIterator(final Object contextNode)
309 throws UnsupportedAxisException {
310 return new NormalizedNodeContextIterator(cast(contextNode));
314 public NormalizedNodeContext getParentNode(final Object contextNode) throws UnsupportedAxisException {
315 return cast(contextNode).getParent();
318 NormalizedNode<?, ?> getRootNode() {
319 return document.getRootNode();
323 SchemaContext getSchemaContext() {
324 return document.getSchemaContext();
327 private static final class NormalizedNodeContextIterator extends UnmodifiableIterator<NormalizedNodeContext> {
328 private NormalizedNodeContext next;
330 NormalizedNodeContextIterator(final NormalizedNodeContext initial) {
331 this.next = requireNonNull(initial);
335 public boolean hasNext() {
340 public NormalizedNodeContext next() {
342 throw new NoSuchElementException();
345 final NormalizedNodeContext ret = next;
346 next = next.getParent();