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.Optional;
12 import com.google.common.base.Preconditions;
13 import com.google.common.base.Predicate;
14 import com.google.common.collect.Iterables;
15 import java.io.IOException;
16 import java.util.ArrayDeque;
17 import java.util.Deque;
18 import java.util.HashSet;
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.data.impl.schema.transform.base.AugmentationSchemaProxy;
26 import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
27 import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
28 import org.opendaylight.yangtools.yang.model.api.AugmentationTarget;
29 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
30 import org.opendaylight.yangtools.yang.model.api.ChoiceNode;
31 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
32 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
33 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
34 import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
35 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
36 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
37 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
38 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
39 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
40 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
41 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
42 import org.slf4j.Logger;
43 import org.slf4j.LoggerFactory;
46 * Utility class for tracking the underlying state of the underlying
50 public final class SchemaTracker {
51 private static final Logger LOG = LoggerFactory.getLogger(SchemaTracker.class);
52 private final Deque<Object> schemaStack = new ArrayDeque<>();
53 private final DataNodeContainer root;
55 private SchemaTracker(final SchemaContext context, final SchemaPath path) {
56 SchemaNode current = Preconditions.checkNotNull(context);
57 for (final QName qname : path.getPathFromRoot()) {
59 if(current instanceof DataNodeContainer) {
60 child = ((DataNodeContainer) current).getDataChildByName(qname);
62 if (child == null && current instanceof SchemaContext) {
63 child = tryFindGroupings((SchemaContext) current, qname).orNull();
66 if(child == null && current instanceof SchemaContext) {
67 child = tryFindNotification((SchemaContext) current, qname)
70 } else if (current instanceof ChoiceNode) {
71 child = ((ChoiceNode) current).getCaseNodeByName(qname);
73 throw new IllegalArgumentException(String.format("Schema node %s does not allow children.", current));
77 Preconditions.checkArgument(current instanceof DataNodeContainer,"Schema path must point to container or list. Supplied path %s pointed to: %s",path,current);
78 root = (DataNodeContainer) current;
81 private Optional<SchemaNode> tryFindGroupings(final SchemaContext ctx, final QName qname) {
82 return Optional.<SchemaNode> fromNullable(Iterables.find(ctx.getGroupings(), new SchemaNodePredicate(qname), null));
85 private Optional<SchemaNode> tryFindNotification(final SchemaContext ctx, final QName qname) {
86 return Optional.<SchemaNode>fromNullable(Iterables.find(ctx.getNotifications(), new SchemaNodePredicate(qname), null));
90 * Create a new writer with the specified context as its root.
92 * @param context Associated {@link SchemaContext}.
93 * @return A new {@link NormalizedNodeStreamWriter}
95 public static SchemaTracker create(final SchemaContext context) {
96 return create(context, SchemaPath.ROOT);
100 * Create a new writer with the specified context and rooted in the specified schema path
102 * @param context Associated {@link SchemaContext}
103 * @param path schema path
105 * @return A new {@link NormalizedNodeStreamWriter}
107 public static SchemaTracker create(final SchemaContext context, final SchemaPath path) {
108 return new SchemaTracker(context, path);
111 public Object getParent() {
112 if (schemaStack.isEmpty()) {
115 return schemaStack.peek();
118 private SchemaNode getSchema(final PathArgument name) {
119 final Object parent = getParent();
120 SchemaNode schema = null;
121 final QName qname = name.getNodeType();
122 if(parent instanceof DataNodeContainer) {
123 schema = ((DataNodeContainer)parent).getDataChildByName(qname);
125 if(schema == null && parent instanceof GroupingDefinition) {
126 schema = ((GroupingDefinition) parent);
129 if(schema == null && parent instanceof NotificationDefinition) {
130 schema = ((NotificationDefinition) parent);
132 } else if(parent instanceof ChoiceNode) {
133 for(final ChoiceCaseNode caze : ((ChoiceNode) parent).getCases()) {
134 final DataSchemaNode potential = caze.getDataChildByName(qname);
135 if(potential != null) {
141 throw new IllegalStateException("Unsupported schema type "+ parent.getClass() +" on stack.");
143 Preconditions.checkArgument(schema != null, "Could not find schema for node %s in %s", qname, parent);
147 public void startList(final PathArgument name) {
148 final SchemaNode schema = getSchema(name);
149 Preconditions.checkArgument(schema instanceof ListSchemaNode, "Node %s is not a list", schema.getPath());
150 schemaStack.push(schema);
153 public void startListItem(final PathArgument name) throws IOException {
154 final Object schema = getParent();
155 Preconditions.checkArgument(schema instanceof ListSchemaNode, "List item is not appropriate");
156 schemaStack.push(schema);
159 public LeafSchemaNode leafNode(final NodeIdentifier name) throws IOException {
160 final SchemaNode schema = getSchema(name);
162 Preconditions.checkArgument(schema instanceof LeafSchemaNode, "Node %s is not a leaf", schema.getPath());
163 return (LeafSchemaNode) schema;
166 public LeafListSchemaNode startLeafSet(final NodeIdentifier name) {
167 final SchemaNode schema = getSchema(name);
169 Preconditions.checkArgument(schema instanceof LeafListSchemaNode, "Node %s is not a leaf-list", schema.getPath());
170 schemaStack.push(schema);
171 return (LeafListSchemaNode)schema;
174 public LeafListSchemaNode leafSetEntryNode() {
175 final Object parent = getParent();
177 Preconditions.checkArgument(parent instanceof LeafListSchemaNode, "Not currently in a leaf-list");
178 return (LeafListSchemaNode) parent;
181 public ChoiceNode startChoiceNode(final NodeIdentifier name) {
182 LOG.debug("Enter choice {}", name);
183 final SchemaNode schema = getSchema(name);
185 Preconditions.checkArgument(schema instanceof ChoiceNode, "Node %s is not a choice", schema.getPath());
186 schemaStack.push(schema);
187 return (ChoiceNode)schema;
190 public SchemaNode startContainerNode(final NodeIdentifier name) {
191 LOG.debug("Enter container {}", name);
192 final SchemaNode schema = getSchema(name);
194 boolean isAllowed = schema instanceof ContainerSchemaNode;
195 isAllowed |= schema instanceof NotificationDefinition;
197 Preconditions.checkArgument(isAllowed, "Node %s is not a container nor a notification", schema.getPath());
198 schemaStack.push(schema);
202 public AugmentationSchema startAugmentationNode(final AugmentationIdentifier identifier) {
203 LOG.debug("Enter augmentation {}", identifier);
204 final Object parent = getParent();
206 Preconditions.checkArgument(parent instanceof AugmentationTarget, "Augmentation not allowed under %s", parent);
207 Preconditions.checkArgument(parent instanceof DataNodeContainer, "Augmentation allowed only in DataNodeContainer",parent);
208 final AugmentationSchema schema = SchemaUtils.findSchemaForAugment((AugmentationTarget) parent, identifier.getPossibleChildNames());
209 final HashSet<DataSchemaNode> realChildSchemas = new HashSet<>();
210 for(final DataSchemaNode child : schema.getChildNodes()) {
211 realChildSchemas.add(((DataNodeContainer) parent).getDataChildByName(child.getQName()));
213 final AugmentationSchema resolvedSchema = new AugmentationSchemaProxy(schema, realChildSchemas);
214 schemaStack.push(resolvedSchema);
215 return resolvedSchema;
218 public AnyXmlSchemaNode anyxmlNode(final NodeIdentifier name) {
219 final SchemaNode schema = getSchema(name);
221 Preconditions.checkArgument(schema instanceof AnyXmlSchemaNode, "Node %s is not anyxml", schema.getPath());
222 return (AnyXmlSchemaNode)schema;
225 public Object endNode() {
226 return schemaStack.pop();
229 private static final class SchemaNodePredicate implements Predicate<SchemaNode> {
230 private final QName qname;
232 public SchemaNodePredicate(final QName qname) {
237 public boolean apply(final SchemaNode input) {
238 return input.getQName().equals(qname);