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.netconf.mdsal.connector.ops.get;
10 import static org.opendaylight.yangtools.yang.data.util.ParserStreamUtils.findSchemaNodeByNameAndNamespace;
12 import com.google.common.base.MoreObjects;
13 import com.google.common.base.Preconditions;
14 import java.util.ArrayList;
15 import java.util.Collection;
16 import java.util.Deque;
17 import java.util.HashMap;
18 import java.util.List;
20 import java.util.Optional;
21 import javax.xml.namespace.NamespaceContext;
22 import javax.xml.stream.XMLStreamWriter;
23 import org.opendaylight.netconf.api.DocumentedException;
24 import org.opendaylight.netconf.api.xml.MissingNameSpaceException;
25 import org.opendaylight.netconf.api.xml.XmlElement;
26 import org.opendaylight.netconf.mdsal.connector.CurrentSchemaContext;
27 import org.opendaylight.yangtools.yang.common.ErrorSeverity;
28 import org.opendaylight.yangtools.yang.common.ErrorType;
29 import org.opendaylight.yangtools.yang.common.QName;
30 import org.opendaylight.yangtools.yang.common.XMLNamespace;
31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.InstanceIdentifierBuilder;
33 import org.opendaylight.yangtools.yang.data.codec.xml.XmlCodecFactory;
34 import org.opendaylight.yangtools.yang.data.impl.codec.TypeDefinitionAwareCodec;
35 import org.opendaylight.yangtools.yang.data.util.codec.TypeAwareCodec;
36 import org.opendaylight.yangtools.yang.model.api.CaseSchemaNode;
37 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
38 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
39 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
40 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
41 import org.opendaylight.yangtools.yang.model.api.Module;
42 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
43 import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
44 import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
45 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
46 import org.slf4j.Logger;
47 import org.slf4j.LoggerFactory;
48 import org.w3c.dom.Document;
51 * Class validates filter content against schema context.
53 public class FilterContentValidator {
55 private static final Logger LOG = LoggerFactory.getLogger(FilterContentValidator.class);
56 private final CurrentSchemaContext schemaContext;
58 public FilterContentValidator(final CurrentSchemaContext schemaContext) {
59 this.schemaContext = schemaContext;
63 * Validates filter content against this validator schema context. If the filter is valid,
64 * method returns {@link YangInstanceIdentifier} of node which can be used as root for data selection.
66 * @param filterContent filter content
67 * @return YangInstanceIdentifier
68 * @throws DocumentedException if filter content validation failed
70 public YangInstanceIdentifier validate(final XmlElement filterContent) throws DocumentedException {
71 final XMLNamespace namespace;
73 namespace = XMLNamespace.of(filterContent.getNamespace());
74 } catch (final IllegalArgumentException e) {
75 throw new RuntimeException("Wrong namespace in element + " + filterContent.toString(), e);
79 final Module module = schemaContext.getCurrentContext().findModules(namespace).iterator().next();
80 final DataSchemaNode schema = getRootDataSchemaNode(module, namespace, filterContent.getName());
81 final FilterTree filterTree = validateNode(
82 filterContent, schema, new FilterTree(schema.getQName(), Type.OTHER, schema));
83 return getFilterDataRoot(filterTree, filterContent, YangInstanceIdentifier.builder());
84 } catch (final ValidationException e) {
85 LOG.debug("Filter content isn't valid", e);
86 throw new DocumentedException("Validation failed. Cause: " + e.getMessage(), e,
87 ErrorType.APPLICATION, DocumentedException.ErrorTag.UNKNOWN_NAMESPACE, ErrorSeverity.ERROR);
92 * Returns module's child data node of given name space and name.
94 * @param module module
95 * @param nameSpace name space
97 * @return child data node schema
98 * @throws DocumentedException if child with given name is not present
100 private DataSchemaNode getRootDataSchemaNode(final Module module, final XMLNamespace nameSpace, final String name)
101 throws DocumentedException {
102 for (final DataSchemaNode childNode : module.getChildNodes()) {
103 final QName qName = childNode.getQName();
104 if (qName.getNamespace().equals(nameSpace) && qName.getLocalName().equals(name)) {
108 throw new DocumentedException("Unable to find node with namespace: " + nameSpace + " in schema context: "
109 + schemaContext.getCurrentContext(),
110 ErrorType.APPLICATION, DocumentedException.ErrorTag.UNKNOWN_NAMESPACE, ErrorSeverity.ERROR);
114 * Recursively checks filter elements against the schema. Returns tree of nodes QNames as they appear in filter.
116 * @param element element to check
117 * @param parentNodeSchema parent node schema
118 * @param tree parent node tree
120 * @throws ValidationException if filter content is not valid
122 private FilterTree validateNode(final XmlElement element, final DataSchemaNode parentNodeSchema,
123 final FilterTree tree) throws ValidationException {
124 final List<XmlElement> childElements = element.getChildElements();
125 for (final XmlElement childElement : childElements) {
127 final Deque<DataSchemaNode> path = findSchemaNodeByNameAndNamespace(parentNodeSchema,
128 childElement.getName(), XMLNamespace.of(childElement.getNamespace()));
129 if (path.isEmpty()) {
130 throw new ValidationException(element, childElement);
132 FilterTree subtree = tree;
133 for (final DataSchemaNode dataSchemaNode : path) {
134 subtree = subtree.addChild(dataSchemaNode);
136 final DataSchemaNode childSchema = path.getLast();
137 validateNode(childElement, childSchema, subtree);
138 } catch (IllegalArgumentException | MissingNameSpaceException e) {
139 throw new RuntimeException("Wrong namespace in element + " + childElement.toString(), e);
146 * Searches for YangInstanceIdentifier of node, which can be used as root for data selection.
147 * It goes as deep in tree as possible. Method stops traversing, when there are multiple child elements. If element
148 * represents list and child elements are key values, then it builds YangInstanceIdentifier of list entry.
150 * @param tree QName tree
151 * @param filterContent filter element
152 * @param builder builder @return YangInstanceIdentifier
154 private YangInstanceIdentifier getFilterDataRoot(final FilterTree tree, final XmlElement filterContent,
155 final InstanceIdentifierBuilder builder) {
156 builder.node(tree.getName());
157 final List<String> path = new ArrayList<>();
159 FilterTree current = tree;
160 while (current.size() == 1) {
161 final FilterTree child = current.getChildren().iterator().next();
162 if (child.getType() == Type.CHOICE_CASE) {
166 builder.node(child.getName());
167 path.add(child.getName().getLocalName());
168 if (child.getType() == Type.LIST) {
169 appendKeyIfPresent(child, filterContent, path, builder);
170 return builder.build();
174 return builder.build();
177 private void appendKeyIfPresent(final FilterTree tree, final XmlElement filterContent,
178 final List<String> pathToList,
179 final InstanceIdentifierBuilder builder) {
180 Preconditions.checkArgument(tree.getSchemaNode() instanceof ListSchemaNode);
181 final ListSchemaNode listSchemaNode = (ListSchemaNode) tree.getSchemaNode();
183 final Map<QName, Object> map = getKeyValues(pathToList, filterContent, listSchemaNode);
184 if (!map.isEmpty()) {
185 builder.nodeWithKey(tree.getName(), map);
189 private Map<QName, Object> getKeyValues(final List<String> path, final XmlElement filterContent,
190 final ListSchemaNode listSchemaNode) {
191 XmlElement current = filterContent;
193 for (final String pathElement : path) {
194 final List<XmlElement> childElements = current.getChildElements(pathElement);
195 // if there are multiple list entries present in the filter, we can't use any keys and must read whole list
196 if (childElements.size() != 1) {
199 current = childElements.get(0);
201 final Map<QName, Object> keys = new HashMap<>();
202 final List<QName> keyDefinition = listSchemaNode.getKeyDefinition();
203 for (final QName qualifiedName : keyDefinition) {
204 final Optional<XmlElement> childElements =
205 current.getOnlyChildElementOptionally(qualifiedName.getLocalName());
206 if (childElements.isEmpty()) {
209 final Optional<String> keyValue = childElements.get().getOnlyTextContentOptionally();
210 if (keyValue.isPresent()) {
211 final LeafSchemaNode listKey = (LeafSchemaNode) listSchemaNode.getDataChildByName(qualifiedName);
212 if (listKey instanceof IdentityrefTypeDefinition) {
213 keys.put(qualifiedName, keyValue.get());
215 final TypeDefinition<? extends TypeDefinition<?>> keyType = listKey.getType();
216 if (keyType instanceof IdentityrefTypeDefinition || keyType instanceof LeafrefTypeDefinition) {
217 final Document document = filterContent.getDomElement().getOwnerDocument();
218 final NamespaceContext nsContext = new UniversalNamespaceContextImpl(document, false);
219 final EffectiveModelContext modelContext = schemaContext.getCurrentContext();
220 final XmlCodecFactory xmlCodecFactory = XmlCodecFactory.create(modelContext);
221 final TypeAwareCodec<?, NamespaceContext, XMLStreamWriter> typeCodec = xmlCodecFactory.codecFor(
222 listKey, SchemaInferenceStack.ofInstantiatedPath(modelContext, listKey.getPath()));
223 final Object deserializedKeyValue = typeCodec.parseValue(nsContext, keyValue.get());
224 keys.put(qualifiedName, deserializedKeyValue);
226 final Object deserializedKey = TypeDefinitionAwareCodec.from(keyType)
227 .deserialize(keyValue.get());
228 keys.put(qualifiedName, deserializedKey);
237 LIST, CHOICE_CASE, OTHER
241 * Class represents tree of QNames as they are present in the filter.
243 private static final class FilterTree {
244 private final Map<QName, FilterTree> children = new HashMap<>();
245 private final DataSchemaNode schemaNode;
246 private final QName name;
247 private final Type type;
249 FilterTree(final QName name, final Type type, final DataSchemaNode schemaNode) {
252 this.schemaNode = schemaNode;
255 FilterTree addChild(final DataSchemaNode data) {
256 final Type childType;
257 if (data instanceof CaseSchemaNode) {
258 childType = Type.CHOICE_CASE;
259 } else if (data instanceof ListSchemaNode) {
260 childType = Type.LIST;
262 childType = Type.OTHER;
264 final QName childName = data.getQName();
265 FilterTree childTree = children.get(childName);
266 if (childTree == null) {
267 childTree = new FilterTree(childName, childType, data);
269 children.put(childName, childTree);
273 Collection<FilterTree> getChildren() {
274 return children.values();
285 DataSchemaNode getSchemaNode() {
290 return children.size();
294 public String toString() {
295 return MoreObjects.toStringHelper(this).add("name", name).add("type", type).add("size", size()).toString();
299 private static class ValidationException extends Exception {
300 private static final long serialVersionUID = 1L;
302 ValidationException(final XmlElement parent, final XmlElement child) {
303 super("Element " + child + " can't be child of " + parent);