2 * Copyright (c) 2014 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.api.schema.stream;
10 import static java.util.Objects.requireNonNull;
11 import static org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter.UNKNOWN_SIZE;
13 import com.google.common.annotations.Beta;
14 import com.google.common.collect.Iterables;
15 import java.io.Closeable;
16 import java.io.Flushable;
17 import java.io.IOException;
18 import java.util.Collection;
19 import java.util.Optional;
21 import javax.xml.stream.XMLStreamReader;
22 import org.eclipse.jdt.annotation.NonNull;
23 import org.eclipse.jdt.annotation.Nullable;
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.AnyXmlNode;
27 import org.opendaylight.yangtools.yang.data.api.schema.AugmentationNode;
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.LeafNode;
31 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
32 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
33 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
34 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
35 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
36 import org.opendaylight.yangtools.yang.data.api.schema.OpaqueAnydataNode;
37 import org.opendaylight.yangtools.yang.data.api.schema.OrderedLeafSetNode;
38 import org.opendaylight.yangtools.yang.data.api.schema.OrderedMapNode;
39 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListEntryNode;
40 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListNode;
41 import org.opendaylight.yangtools.yang.data.api.schema.YangModeledAnyXmlNode;
42 import org.slf4j.Logger;
43 import org.slf4j.LoggerFactory;
46 * This is an experimental iterator over a {@link NormalizedNode}. This is essentially
47 * the opposite of a {@link XMLStreamReader} -- unlike instantiating an iterator over
48 * the backing data, this encapsulates a {@link NormalizedNodeStreamWriter} and allows
49 * us to write multiple nodes.
52 public class NormalizedNodeWriter implements Closeable, Flushable {
53 private static final Logger LOG = LoggerFactory.getLogger(NormalizedNodeWriter.class);
55 private final @NonNull NormalizedNodeStreamWriter writer;
56 private final @Nullable OpaqueAnydataExtension opaqueAnydataExt;
58 protected NormalizedNodeWriter(final NormalizedNodeStreamWriter writer) {
59 this.writer = requireNonNull(writer);
60 opaqueAnydataExt = writer.getExtensions().getInstance(OpaqueAnydataExtension.class);
63 protected final NormalizedNodeStreamWriter getWriter() {
68 * Create a new writer backed by a {@link NormalizedNodeStreamWriter}.
70 * @param writer Back-end writer
71 * @return A new instance.
73 public static NormalizedNodeWriter forStreamWriter(final NormalizedNodeStreamWriter writer) {
74 return forStreamWriter(writer, true);
78 * Create a new writer backed by a {@link NormalizedNodeStreamWriter}. Unlike the simple
79 * {@link #forStreamWriter(NormalizedNodeStreamWriter)} method, this allows the caller to switch off RFC6020 XML
80 * compliance, providing better throughput. The reason is that the XML mapping rules in RFC6020 require
81 * the encoding to emit leaf nodes which participate in a list's key first and in the order in which they are
82 * defined in the key. For JSON, this requirement is completely relaxed and leaves can be ordered in any way we
83 * see fit. The former requires a bit of work: first a lookup for each key and then for each emitted node we need
84 * to check whether it was already emitted.
86 * @param writer Back-end writer
87 * @param orderKeyLeaves whether the returned instance should be RFC6020 XML compliant.
88 * @return A new instance.
90 public static NormalizedNodeWriter forStreamWriter(final NormalizedNodeStreamWriter writer,
91 final boolean orderKeyLeaves) {
92 return orderKeyLeaves ? new OrderedNormalizedNodeWriter(writer) : new NormalizedNodeWriter(writer);
96 * Iterate over the provided {@link NormalizedNode} and emit write
97 * events to the encapsulated {@link NormalizedNodeStreamWriter}.
100 * @return NormalizedNodeWriter this
101 * @throws IOException when thrown from the backing writer.
103 public NormalizedNodeWriter write(final NormalizedNode<?, ?> node) throws IOException {
104 if (wasProcessedAsCompositeNode(node)) {
108 if (wasProcessAsSimpleNode(node)) {
112 throw new IllegalStateException("It wasn't possible to serialize node " + node);
116 public void flush() throws IOException {
121 public void close() throws IOException {
127 * Emit a best guess of a hint for a particular set of children. It evaluates the
128 * iterable to see if the size can be easily gotten to. If it is, we hint at the
129 * real number of child nodes. Otherwise we emit UNKNOWN_SIZE.
131 * @param children Child nodes
132 * @return Best estimate of the collection size required to hold all the children.
134 protected static int childSizeHint(final Iterable<?> children) {
135 return children instanceof Collection ? ((Collection<?>) children).size() : UNKNOWN_SIZE;
138 protected boolean wasProcessAsSimpleNode(final NormalizedNode<?, ?> node) throws IOException {
139 if (node instanceof LeafSetEntryNode) {
140 final LeafSetEntryNode<?> nodeAsLeafList = (LeafSetEntryNode<?>)node;
141 writer.startLeafSetEntryNode(nodeAsLeafList.getIdentifier());
142 writer.scalarValue(nodeAsLeafList.getValue());
145 } else if (node instanceof LeafNode) {
146 final LeafNode<?> nodeAsLeaf = (LeafNode<?>)node;
147 writer.startLeafNode(nodeAsLeaf.getIdentifier());
148 writer.scalarValue(nodeAsLeaf.getValue());
151 } else if (node instanceof AnyXmlNode) {
152 final AnyXmlNode anyXmlNode = (AnyXmlNode)node;
153 writer.startAnyxmlNode(anyXmlNode.getIdentifier());
154 writer.domSourceValue(anyXmlNode.getValue());
157 } else if (node instanceof OpaqueAnydataNode) {
158 return writeAnydata((OpaqueAnydataNode) node);
163 private boolean writeAnydata(final OpaqueAnydataNode node) throws IOException {
164 if (opaqueAnydataExt == null) {
165 LOG.debug("Writer {} cannot support anydata node {}", writer, node);
169 opaqueAnydataExt.streamOpaqueAnydataNode(node.getIdentifier(), node.getValue());
175 * Emit events for all children and then emit an endNode() event.
177 * @param children Child iterable
179 * @throws IOException when the writer reports it
181 protected boolean writeChildren(final Iterable<? extends NormalizedNode<?, ?>> children) throws IOException {
182 for (final NormalizedNode<?, ?> child : children) {
190 protected boolean writeMapEntryNode(final MapEntryNode node) throws IOException {
191 writer.startMapEntryNode(node.getIdentifier(), childSizeHint(node.getValue()));
192 return writeChildren(node.getValue());
195 protected boolean wasProcessedAsCompositeNode(final NormalizedNode<?, ?> node) throws IOException {
196 if (node instanceof ContainerNode) {
197 final ContainerNode n = (ContainerNode) node;
198 writer.startContainerNode(n.getIdentifier(), childSizeHint(n.getValue()));
199 return writeChildren(n.getValue());
201 if (node instanceof YangModeledAnyXmlNode) {
202 final YangModeledAnyXmlNode n = (YangModeledAnyXmlNode) node;
203 writer.startYangModeledAnyXmlNode(n.getIdentifier(), childSizeHint(n.getValue()));
204 return writeChildren(n.getValue());
206 if (node instanceof MapEntryNode) {
207 return writeMapEntryNode((MapEntryNode) node);
209 if (node instanceof UnkeyedListEntryNode) {
210 final UnkeyedListEntryNode n = (UnkeyedListEntryNode) node;
211 writer.startUnkeyedListItem(n.getIdentifier(), childSizeHint(n.getValue()));
212 return writeChildren(n.getValue());
214 if (node instanceof ChoiceNode) {
215 final ChoiceNode n = (ChoiceNode) node;
216 writer.startChoiceNode(n.getIdentifier(), childSizeHint(n.getValue()));
217 return writeChildren(n.getValue());
219 if (node instanceof AugmentationNode) {
220 final AugmentationNode n = (AugmentationNode) node;
221 writer.startAugmentationNode(n.getIdentifier());
222 return writeChildren(n.getValue());
224 if (node instanceof UnkeyedListNode) {
225 final UnkeyedListNode n = (UnkeyedListNode) node;
226 writer.startUnkeyedList(n.getIdentifier(), childSizeHint(n.getValue()));
227 return writeChildren(n.getValue());
229 if (node instanceof OrderedMapNode) {
230 final OrderedMapNode n = (OrderedMapNode) node;
231 writer.startOrderedMapNode(n.getIdentifier(), childSizeHint(n.getValue()));
232 return writeChildren(n.getValue());
234 if (node instanceof MapNode) {
235 final MapNode n = (MapNode) node;
236 writer.startMapNode(n.getIdentifier(), childSizeHint(n.getValue()));
237 return writeChildren(n.getValue());
239 if (node instanceof OrderedLeafSetNode) {
240 final LeafSetNode<?> n = (LeafSetNode<?>) node;
241 writer.startOrderedLeafSet(n.getIdentifier(), childSizeHint(n.getValue()));
242 return writeChildren(n.getValue());
244 if (node instanceof LeafSetNode) {
245 final LeafSetNode<?> n = (LeafSetNode<?>) node;
246 writer.startLeafSet(n.getIdentifier(), childSizeHint(n.getValue()));
247 return writeChildren(n.getValue());
253 private static final class OrderedNormalizedNodeWriter extends NormalizedNodeWriter {
254 private static final Logger LOG = LoggerFactory.getLogger(OrderedNormalizedNodeWriter.class);
256 OrderedNormalizedNodeWriter(final NormalizedNodeStreamWriter writer) {
261 protected boolean writeMapEntryNode(final MapEntryNode node) throws IOException {
262 final NormalizedNodeStreamWriter nnWriter = getWriter();
263 nnWriter.startMapEntryNode(node.getIdentifier(), childSizeHint(node.getValue()));
265 final Set<QName> qnames = node.getIdentifier().getKeyValues().keySet();
266 // Write out all the key children
267 for (final QName qname : qnames) {
268 final Optional<? extends NormalizedNode<?, ?>> child = node.getChild(new NodeIdentifier(qname));
269 if (child.isPresent()) {
272 LOG.info("No child for key element {} found", qname);
276 // Write all the rest
277 return writeChildren(Iterables.filter(node.getValue(), input -> {
278 if (input instanceof AugmentationNode) {
281 if (!qnames.contains(input.getNodeType())) {
285 LOG.debug("Skipping key child {}", input);