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 java.io.IOException;
13 import java.util.ArrayDeque;
14 import java.util.Deque;
15 import java.util.HashSet;
16 import javax.xml.stream.XMLStreamWriter;
17 import org.opendaylight.yangtools.yang.common.QName;
18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
21 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
22 import org.opendaylight.yangtools.yang.data.impl.schema.SchemaUtils;
23 import org.opendaylight.yangtools.yang.data.impl.schema.transform.base.AugmentationSchemaProxy;
24 import org.opendaylight.yangtools.yang.model.api.AnyXmlSchemaNode;
25 import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
26 import org.opendaylight.yangtools.yang.model.api.AugmentationTarget;
27 import org.opendaylight.yangtools.yang.model.api.ChoiceNode;
28 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
29 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
30 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
31 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
32 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
33 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
34 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
35 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
36 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
37 import org.slf4j.Logger;
38 import org.slf4j.LoggerFactory;
41 * Utility class for tracking the underlying state of the underlying
45 public final class SchemaTracker {
46 private static final Logger LOG = LoggerFactory.getLogger(SchemaTracker.class);
47 private final Deque<Object> schemaStack = new ArrayDeque<>();
48 private final DataNodeContainer root;
50 private SchemaTracker(final SchemaContext context, final SchemaPath path) {
51 DataNodeContainer current = Preconditions.checkNotNull(context);
52 for (QName qname : path.getPathFromRoot()) {
53 final DataSchemaNode child = current.getDataChildByName(qname);
54 Preconditions.checkArgument(child instanceof DataNodeContainer);
55 current = (DataNodeContainer) child;
62 * Create a new writer with the specified context as its root.
64 * @param writer Output {@link XMLStreamWriter}
65 * @param context Associated {@link SchemaContext}.
66 * @return A new {@link NormalizedNodeStreamWriter}
68 public static SchemaTracker create(final SchemaContext context) {
69 return create(context, SchemaPath.ROOT);
73 * Create a new writer with the specified context and rooted in the specified schema path
75 * @param writer Output {@link XMLStreamWriter}
76 * @param context Associated {@link SchemaContext}.
78 * @return A new {@link NormalizedNodeStreamWriter}
80 public static SchemaTracker create(final SchemaContext context, final SchemaPath path) {
81 return new SchemaTracker(context, path);
84 public Object getParent() {
85 if (schemaStack.isEmpty()) {
88 return schemaStack.peek();
91 private SchemaNode getSchema(final PathArgument name) {
92 final Object parent = getParent();
93 Preconditions.checkState(parent instanceof DataNodeContainer);
95 final QName qname = name.getNodeType();
96 final SchemaNode schema = ((DataNodeContainer)parent).getDataChildByName(qname);
97 Preconditions.checkArgument(schema != null, "Could not find schema for node %s in %s", qname, parent);
101 public void startList(final NodeIdentifier name) {
102 final SchemaNode schema = getSchema(name);
103 Preconditions.checkArgument(schema instanceof ListSchemaNode, "Node %s is not a list", schema.getPath());
104 schemaStack.push(schema);
107 public void startListItem(final PathArgument name) throws IOException {
108 final Object schema = getParent();
109 Preconditions.checkArgument(schema instanceof ListSchemaNode, "List item is not appropriate");
110 schemaStack.push(schema);
113 public LeafSchemaNode leafNode(final NodeIdentifier name) throws IOException {
114 final SchemaNode schema = getSchema(name);
116 Preconditions.checkArgument(schema instanceof LeafSchemaNode, "Node %s is not a leaf", schema.getPath());
117 return (LeafSchemaNode) schema;
120 public SchemaNode startLeafSet(final NodeIdentifier name) {
121 final SchemaNode schema = getSchema(name);
123 Preconditions.checkArgument(schema instanceof LeafListSchemaNode, "Node %s is not a leaf-list", schema.getPath());
124 schemaStack.push(schema);
128 public LeafListSchemaNode leafSetEntryNode() {
129 final Object parent = getParent();
131 Preconditions.checkArgument(parent instanceof LeafListSchemaNode, "Not currently in a leaf-list");
132 return (LeafListSchemaNode) parent;
135 public SchemaNode startChoiceNode(final NodeIdentifier name) {
136 LOG.debug("Enter choice {}", name);
137 final SchemaNode schema = getSchema(name);
139 Preconditions.checkArgument(schema instanceof ChoiceNode, "Node %s is not a choice", schema.getPath());
140 schemaStack.push(schema);
144 public SchemaNode startContainerNode(final NodeIdentifier name) {
145 LOG.debug("Enter container {}", name);
146 final SchemaNode schema = getSchema(name);
148 Preconditions.checkArgument(schema instanceof ContainerSchemaNode, "Node %s is not a container", schema.getPath());
149 schemaStack.push(schema);
153 public AugmentationSchema startAugmentationNode(final AugmentationIdentifier identifier) {
154 LOG.debug("Enter augmentation {}", identifier);
155 final Object parent = getParent();
157 Preconditions.checkArgument(parent instanceof AugmentationTarget, "Augmentation not allowed under %s", parent);
158 Preconditions.checkArgument(parent instanceof DataNodeContainer, "Augmentation allowed only in DataNodeContainer",parent);
159 final AugmentationSchema schema = SchemaUtils.findSchemaForAugment((AugmentationTarget) parent, identifier.getPossibleChildNames());
160 HashSet<DataSchemaNode> realChildSchemas = new HashSet<>();
161 for(DataSchemaNode child : schema.getChildNodes()) {
162 realChildSchemas.add(((DataNodeContainer) parent).getDataChildByName(child.getQName()));
164 AugmentationSchema resolvedSchema = new AugmentationSchemaProxy(schema, realChildSchemas);
165 schemaStack.push(resolvedSchema);
166 return resolvedSchema;
169 public AnyXmlSchemaNode anyxmlNode(final NodeIdentifier name) {
170 final SchemaNode schema = getSchema(name);
172 Preconditions.checkArgument(schema instanceof AnyXmlSchemaNode, "Node %s is not anyxml", schema.getPath());
173 return (AnyXmlSchemaNode)schema;
176 public Object endNode() {
177 return schemaStack.pop();