2 * Copyright (c) 2016 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.restconf.nb.rfc8040.jersey.providers;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.annotations.Beta;
13 import com.google.common.collect.Iterables;
14 import java.io.IOException;
15 import java.util.List;
16 import java.util.Map.Entry;
18 import javax.xml.transform.dom.DOMSource;
19 import org.eclipse.jdt.annotation.NonNull;
20 import org.eclipse.jdt.annotation.Nullable;
21 import org.opendaylight.restconf.api.query.DepthParam;
22 import org.opendaylight.restconf.nb.rfc8040.jersey.providers.api.RestconfNormalizedNodeWriter;
23 import org.opendaylight.yangtools.yang.common.Ordering;
24 import org.opendaylight.yangtools.yang.common.QName;
25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
26 import org.opendaylight.yangtools.yang.data.api.schema.AnydataNode;
27 import org.opendaylight.yangtools.yang.data.api.schema.AnyxmlNode;
28 import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
29 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
30 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
31 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
32 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
33 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
34 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
35 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
36 import org.opendaylight.yangtools.yang.data.api.schema.SystemMapNode;
37 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListEntryNode;
38 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListNode;
39 import org.opendaylight.yangtools.yang.data.api.schema.UserMapNode;
40 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
41 import org.slf4j.Logger;
42 import org.slf4j.LoggerFactory;
45 * This is an experimental iterator over a {@link NormalizedNode}. This is essentially
46 * the opposite of a {@link javax.xml.stream.XMLStreamReader} -- unlike instantiating an iterator over
47 * the backing data, this encapsulates a {@link NormalizedNodeStreamWriter} and allows
48 * us to write multiple nodes.
51 public class ParameterAwareNormalizedNodeWriter implements RestconfNormalizedNodeWriter {
52 private static final QName ROOT_DATA_QNAME = QName.create("urn:ietf:params:xml:ns:netconf:base:1.0", "data");
54 private final NormalizedNodeStreamWriter writer;
55 private final Integer maxDepth;
56 protected final List<Set<QName>> fields;
57 protected int currentDepth = 0;
59 private ParameterAwareNormalizedNodeWriter(final NormalizedNodeStreamWriter writer, final DepthParam depth,
60 final List<Set<QName>> fields) {
61 this.writer = requireNonNull(writer);
62 maxDepth = depth == null ? null : depth.value();
66 protected final NormalizedNodeStreamWriter getWriter() {
71 * Create a new writer backed by a {@link NormalizedNodeStreamWriter}.
73 * @param writer Back-end writer
74 * @param maxDepth Maximal depth to write
75 * @return A new instance.
77 public static @NonNull ParameterAwareNormalizedNodeWriter forStreamWriter(final NormalizedNodeStreamWriter writer,
78 final @Nullable DepthParam maxDepth) {
79 return forStreamWriter(writer, true, maxDepth, null);
83 * Create a new writer backed by a {@link NormalizedNodeStreamWriter}.
85 * @param writer Back-end writer
86 * @param maxDepth Maximal depth to write
87 * @param fields Selected child nodes to write
88 * @return A new instance.
90 public static @NonNull ParameterAwareNormalizedNodeWriter forStreamWriter(final NormalizedNodeStreamWriter writer,
91 final @Nullable DepthParam maxDepth, final List<Set<QName>> fields) {
92 return forStreamWriter(writer, true, maxDepth, fields);
96 * Create a new writer backed by a {@link NormalizedNodeStreamWriter}. Unlike the simple
97 * {@link #forStreamWriter(NormalizedNodeStreamWriter, DepthParam, List)} method, this allows the caller to
98 * switch off RFC6020 XML compliance, providing better throughput. The reason is that the XML mapping rules in
99 * RFC6020 require the encoding to emit leaf nodes which participate in a list's key first and in the order in which
100 * they are defined in the key. For JSON, this requirement is completely relaxed and leaves can be ordered in any
101 * way we see fit. The former requires a bit of work: first a lookup for each key and then for each emitted node we
102 * need to check whether it was already emitted.
104 * @param writer Back-end writer
105 * @param orderKeyLeaves whether the returned instance should be RFC6020 XML compliant.
106 * @param depth Maximal depth to write
107 * @param fields Selected child nodes to write
108 * @return A new instance.
110 public static @NonNull ParameterAwareNormalizedNodeWriter forStreamWriter(final NormalizedNodeStreamWriter writer,
111 final boolean orderKeyLeaves, final DepthParam depth, final List<Set<QName>> fields) {
112 return orderKeyLeaves ? new OrderedParameterAwareNormalizedNodeWriter(writer, depth, fields)
113 : new ParameterAwareNormalizedNodeWriter(writer, depth, fields);
117 * Iterate over the provided {@link NormalizedNode} and emit write
118 * events to the encapsulated {@link NormalizedNodeStreamWriter}.
121 * @return {@code ParameterAwareNormalizedNodeWriter}
122 * @throws IOException when thrown from the backing writer.
125 public final ParameterAwareNormalizedNodeWriter write(final NormalizedNode node) throws IOException {
126 if (wasProcessedAsCompositeNode(node)) {
130 if (wasProcessAsSimpleNode(node)) {
134 throw new IllegalStateException("It wasn't possible to serialize node " + node);
138 public void flush() throws IOException {
143 public void close() throws IOException {
148 private boolean wasProcessAsSimpleNode(final NormalizedNode node) throws IOException {
149 if (node instanceof LeafSetEntryNode<?> nodeAsLeafList) {
150 if (selectedByParameters(node, false)) {
151 writer.startLeafSetEntryNode(nodeAsLeafList.name());
152 writer.scalarValue(nodeAsLeafList.body());
156 } else if (node instanceof LeafNode<?> nodeAsLeaf) {
157 writer.startLeafNode(nodeAsLeaf.name());
158 writer.scalarValue(nodeAsLeaf.body());
161 } else if (node instanceof AnyxmlNode<?> anyxmlNode) {
162 final Class<?> objectModel = anyxmlNode.bodyObjectModel();
163 if (writer.startAnyxmlNode(anyxmlNode.name(), objectModel)) {
164 if (DOMSource.class.isAssignableFrom(objectModel)) {
165 writer.domSourceValue((DOMSource) anyxmlNode.body());
167 writer.scalarValue(anyxmlNode.body());
172 } else if (node instanceof AnydataNode<?> anydataNode) {
173 final Class<?> objectModel = anydataNode.bodyObjectModel();
174 if (writer.startAnydataNode(anydataNode.name(), objectModel)) {
175 writer.scalarValue(anydataNode.body());
185 * Check if node should be written according to parameters fields and depth.
186 * See <a href="https://tools.ietf.org/html/draft-ietf-netconf-restconf-18#page-49">Restconf draft</a>.
187 * @param node Node to be written
188 * @param mixinParent {@code true} if parent is mixin, {@code false} otherwise
189 * @return {@code true} if node will be written, {@code false} otherwise
191 protected boolean selectedByParameters(final NormalizedNode node, final boolean mixinParent) {
192 // nodes to be written are not limited by fields, only by depth
193 if (fields == null) {
194 return maxDepth == null || currentDepth < maxDepth;
197 // children of mixin nodes are never selected in fields but must be written if they are first in selected target
198 if (mixinParent && currentDepth == 0) {
202 // write only selected nodes
203 if (currentDepth > 0 && currentDepth <= fields.size()) {
204 return fields.get(currentDepth - 1).contains(node.name().getNodeType());
207 // after this depth only depth parameter is used to determine when to write node
208 return maxDepth == null || currentDepth < maxDepth;
212 * Emit events for all children and then emit an endNode() event.
214 * @param children Child iterable
215 * @param mixinParent {@code true} if parent is mixin, {@code false} otherwise
217 * @throws IOException when the writer reports it
219 protected final boolean writeChildren(final Iterable<? extends NormalizedNode> children,
220 final boolean mixinParent) throws IOException {
221 for (final NormalizedNode child : children) {
222 if (selectedByParameters(child, mixinParent)) {
230 protected boolean writeMapEntryChildren(final MapEntryNode mapEntryNode) throws IOException {
231 if (selectedByParameters(mapEntryNode, false)) {
232 writeChildren(mapEntryNode.body(), false);
233 } else if (fields == null && maxDepth != null && currentDepth == maxDepth) {
234 writeOnlyKeys(mapEntryNode.name().entrySet());
239 private void writeOnlyKeys(final Set<Entry<QName, Object>> entries) throws IOException {
240 for (final Entry<QName, Object> entry : entries) {
241 writer.startLeafNode(new NodeIdentifier(entry.getKey()));
242 writer.scalarValue(entry.getValue());
248 protected boolean writeMapEntryNode(final MapEntryNode node) throws IOException {
249 writer.startMapEntryNode(node.name(), node.size());
251 writeMapEntryChildren(node);
256 private boolean wasProcessedAsCompositeNode(final NormalizedNode node) throws IOException {
257 boolean processedAsCompositeNode = false;
258 if (node instanceof ContainerNode n) {
259 if (!n.name().getNodeType().withoutRevision().equals(ROOT_DATA_QNAME)) {
260 writer.startContainerNode(n.name(), n.size());
262 processedAsCompositeNode = writeChildren(n.body(), false);
265 // write child nodes of data root container
266 for (final NormalizedNode child : n.body()) {
268 if (selectedByParameters(child, false)) {
273 processedAsCompositeNode = true;
275 } else if (node instanceof MapEntryNode n) {
276 processedAsCompositeNode = writeMapEntryNode(n);
277 } else if (node instanceof UnkeyedListEntryNode n) {
278 writer.startUnkeyedListItem(n.name(), n.size());
280 processedAsCompositeNode = writeChildren(n.body(), false);
282 } else if (node instanceof ChoiceNode n) {
283 writer.startChoiceNode(n.name(), n.size());
284 processedAsCompositeNode = writeChildren(n.body(), true);
285 } else if (node instanceof UnkeyedListNode n) {
286 writer.startUnkeyedList(n.name(), n.size());
287 processedAsCompositeNode = writeChildren(n.body(), false);
288 } else if (node instanceof UserMapNode n) {
289 writer.startOrderedMapNode(n.name(), n.size());
290 processedAsCompositeNode = writeChildren(n.body(), true);
291 } else if (node instanceof SystemMapNode n) {
292 writer.startMapNode(n.name(), n.size());
293 processedAsCompositeNode = writeChildren(n.body(), true);
294 } else if (node instanceof LeafSetNode<?> n) {
295 if (n.ordering() == Ordering.USER) {
296 writer.startOrderedLeafSet(n.name(), n.size());
298 writer.startLeafSet(n.name(), n.size());
301 processedAsCompositeNode = writeChildren(n.body(), true);
305 return processedAsCompositeNode;
308 private static final class OrderedParameterAwareNormalizedNodeWriter extends ParameterAwareNormalizedNodeWriter {
309 private static final Logger LOG = LoggerFactory.getLogger(OrderedParameterAwareNormalizedNodeWriter.class);
311 OrderedParameterAwareNormalizedNodeWriter(final NormalizedNodeStreamWriter writer, final DepthParam depth,
312 final List<Set<QName>> fields) {
313 super(writer, depth, fields);
317 protected boolean writeMapEntryNode(final MapEntryNode node) throws IOException {
318 final NormalizedNodeStreamWriter writer = getWriter();
319 writer.startMapEntryNode(node.name(), node.size());
321 final Set<QName> qnames = node.name().keySet();
322 // Write out all the key children
324 for (final QName qname : qnames) {
325 final DataContainerChild child = node.childByArg(new NodeIdentifier(qname));
327 if (selectedByParameters(child, false)) {
331 LOG.info("No child for key element {} found", qname);
337 // Write all the rest
338 final boolean result =
339 writeChildren(Iterables.filter(node.body(), input -> {
340 if (!qnames.contains(input.name().getNodeType())) {
344 LOG.debug("Skipping key child {}", input);