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.impl.codec;
10 import com.google.common.annotations.Beta;
11 import com.google.common.base.Preconditions;
12 import com.google.common.collect.Iterables;
13 import java.io.IOException;
14 import java.util.ArrayDeque;
15 import java.util.Collection;
16 import java.util.Deque;
17 import java.util.HashSet;
18 import java.util.Optional;
19 import org.opendaylight.yangtools.yang.common.QName;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
23 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
24 import org.opendaylight.yangtools.yang.data.impl.schema.SchemaUtils;
25 import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
26 import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
27 import org.opendaylight.yangtools.yang.model.api.AugmentationTarget;
28 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
29 import org.opendaylight.yangtools.yang.model.api.ChoiceSchemaNode;
30 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
31 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
32 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
33 import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
34 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
35 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
36 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
37 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
38 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
39 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
40 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
41 import org.opendaylight.yangtools.yang.model.api.YangModeledAnyXmlSchemaNode;
42 import org.opendaylight.yangtools.yang.model.util.EffectiveAugmentationSchema;
43 import org.slf4j.Logger;
44 import org.slf4j.LoggerFactory;
47 * Utility class for tracking the underlying state of the underlying
51 public final class SchemaTracker {
52 private static final Logger LOG = LoggerFactory.getLogger(SchemaTracker.class);
53 private final Deque<Object> schemaStack = new ArrayDeque<>();
54 private final DataNodeContainer root;
56 private SchemaTracker(final SchemaContext context, final SchemaPath path) {
57 final Collection<SchemaNode> schemaNodes = SchemaUtils.findParentSchemaNodesOnPath(context, path);
58 Preconditions.checkArgument(!schemaNodes.isEmpty(), "Unable to find schema node for supplied schema path: %s",
60 if (schemaNodes.size() > 1) {
61 LOG.warn("More possible schema nodes {} for supplied schema path {}", schemaNodes, path);
63 final Optional<SchemaNode> current = schemaNodes.stream().filter(node -> node instanceof DataNodeContainer)
65 Preconditions.checkArgument(current.isPresent(),
66 "Schema path must point to container or list or an rpc input/output. Supplied path %s pointed to: %s",
68 root = (DataNodeContainer) current.get();
72 * Create a new writer with the specified context as its root.
74 * @param context Associated {@link SchemaContext}.
75 * @return A new {@link NormalizedNodeStreamWriter}
77 public static SchemaTracker create(final SchemaContext context) {
78 return create(context, SchemaPath.ROOT);
82 * Create a new writer with the specified context and rooted in the specified schema path.
84 * @param context Associated {@link SchemaContext}
85 * @param path schema path
86 * @return A new {@link NormalizedNodeStreamWriter}
88 public static SchemaTracker create(final SchemaContext context, final SchemaPath path) {
89 return new SchemaTracker(context, path);
92 public Object getParent() {
93 if (schemaStack.isEmpty()) {
96 return schemaStack.peek();
99 private SchemaNode getSchema(final PathArgument name) {
100 final Object parent = getParent();
101 SchemaNode schema = null;
102 final QName qname = name.getNodeType();
103 if (parent instanceof DataNodeContainer) {
104 schema = ((DataNodeContainer)parent).getDataChildByName(qname);
105 if (schema == null) {
106 if (parent instanceof GroupingDefinition) {
107 schema = (GroupingDefinition) parent;
108 } else if (parent instanceof NotificationDefinition) {
109 schema = (NotificationDefinition) parent;
112 } else if (parent instanceof ChoiceSchemaNode) {
113 schema = findChildInCases((ChoiceSchemaNode) parent, qname);
115 throw new IllegalStateException("Unsupported schema type " + parent.getClass() + " on stack.");
118 Preconditions.checkArgument(schema != null, "Could not find schema for node %s in %s", qname, parent);
122 private static SchemaNode findChildInCases(final ChoiceSchemaNode parent, final QName qname) {
123 DataSchemaNode schema = null;
124 for (final ChoiceCaseNode caze : parent.getCases()) {
125 final DataSchemaNode potential = caze.getDataChildByName(qname);
126 if (potential != null) {
134 private static SchemaNode findCaseByChild(final ChoiceSchemaNode parent, final QName qname) {
135 DataSchemaNode schema = null;
136 for (final ChoiceCaseNode caze : parent.getCases()) {
137 final DataSchemaNode potential = caze.getDataChildByName(qname);
138 if (potential != null) {
146 public void startList(final PathArgument name) {
147 final SchemaNode schema = getSchema(name);
148 Preconditions.checkArgument(schema instanceof ListSchemaNode, "Node %s is not a list", schema.getPath());
149 schemaStack.push(schema);
152 public void startListItem(final PathArgument name) throws IOException {
153 final Object schema = getParent();
154 Preconditions.checkArgument(schema instanceof ListSchemaNode, "List item is not appropriate");
155 schemaStack.push(schema);
158 public LeafSchemaNode leafNode(final NodeIdentifier name) throws IOException {
159 final SchemaNode schema = getSchema(name);
161 Preconditions.checkArgument(schema instanceof LeafSchemaNode, "Node %s is not a leaf", schema.getPath());
162 return (LeafSchemaNode) schema;
165 public LeafListSchemaNode startLeafSet(final NodeIdentifier name) {
166 final SchemaNode schema = getSchema(name);
168 Preconditions.checkArgument(schema instanceof LeafListSchemaNode, "Node %s is not a leaf-list",
170 schemaStack.push(schema);
171 return (LeafListSchemaNode)schema;
175 public LeafListSchemaNode leafSetEntryNode() {
176 final Object parent = getParent();
178 Preconditions.checkArgument(parent instanceof LeafListSchemaNode, "Not currently in a leaf-list");
179 return (LeafListSchemaNode) parent;
182 public LeafListSchemaNode leafSetEntryNode(final QName qname) {
183 final Object parent = getParent();
184 if (parent instanceof LeafListSchemaNode) {
185 return (LeafListSchemaNode) parent;
188 final SchemaNode child = SchemaUtils.findDataChildSchemaByQName((SchemaNode) parent, qname);
189 Preconditions.checkArgument(child instanceof LeafListSchemaNode,
190 "Node %s is neither a leaf-list nor currently in a leaf-list", child.getPath());
191 return (LeafListSchemaNode) child;
194 public ChoiceSchemaNode startChoiceNode(final NodeIdentifier name) {
195 LOG.debug("Enter choice {}", name);
196 final SchemaNode schema = getSchema(name);
198 Preconditions.checkArgument(schema instanceof ChoiceSchemaNode, "Node %s is not a choice", schema.getPath());
199 schemaStack.push(schema);
200 return (ChoiceSchemaNode)schema;
203 public SchemaNode startContainerNode(final NodeIdentifier name) {
204 LOG.debug("Enter container {}", name);
205 final SchemaNode schema = getSchema(name);
207 boolean isAllowed = schema instanceof ContainerSchemaNode;
208 isAllowed |= schema instanceof NotificationDefinition;
210 Preconditions.checkArgument(isAllowed, "Node %s is not a container nor a notification", schema.getPath());
211 schemaStack.push(schema);
216 public SchemaNode startYangModeledAnyXmlNode(final NodeIdentifier name) {
217 LOG.debug("Enter yang modeled anyXml {}", name);
218 final SchemaNode schema = getSchema(name);
220 Preconditions.checkArgument(schema instanceof YangModeledAnyXmlSchemaNode,
221 "Node %s is not an yang modeled anyXml.", schema.getPath());
223 schemaStack.push(((YangModeledAnyXmlSchemaNode) schema).getSchemaOfAnyXmlData());
228 public AugmentationSchema startAugmentationNode(final AugmentationIdentifier identifier) {
229 LOG.debug("Enter augmentation {}", identifier);
230 Object parent = getParent();
232 Preconditions.checkArgument(parent instanceof AugmentationTarget, "Augmentation not allowed under %s", parent);
233 if (parent instanceof ChoiceSchemaNode) {
234 final QName name = Iterables.get(identifier.getPossibleChildNames(), 0);
235 parent = findCaseByChild((ChoiceSchemaNode) parent, name);
237 Preconditions.checkArgument(parent instanceof DataNodeContainer,
238 "Augmentation allowed only in DataNodeContainer", parent);
239 final AugmentationSchema schema = SchemaUtils.findSchemaForAugment((AugmentationTarget) parent,
240 identifier.getPossibleChildNames());
241 final HashSet<DataSchemaNode> realChildSchemas = new HashSet<>();
242 for (final DataSchemaNode child : schema.getChildNodes()) {
243 realChildSchemas.add(((DataNodeContainer) parent).getDataChildByName(child.getQName()));
245 final AugmentationSchema resolvedSchema = new EffectiveAugmentationSchema(schema, realChildSchemas);
246 schemaStack.push(resolvedSchema);
247 return resolvedSchema;
250 public AnyXmlSchemaNode anyxmlNode(final NodeIdentifier name) {
251 final SchemaNode schema = getSchema(name);
253 Preconditions.checkArgument(schema instanceof AnyXmlSchemaNode, "Node %s is not anyxml", schema.getPath());
254 return (AnyXmlSchemaNode)schema;
257 public Object endNode() {
258 return schemaStack.pop();