2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2020 Nordix Foundation
4 * Modifications Copyright (C) 2021 Bell Canada. All rights reserved.
5 * Modifications Copyright (C) 2021 Pantheon.tech
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.cps.utils;
24 import com.google.gson.JsonSyntaxException;
25 import com.google.gson.stream.JsonReader;
26 import java.io.IOException;
27 import java.io.StringReader;
28 import java.util.Arrays;
29 import java.util.Collection;
30 import java.util.Collections;
31 import java.util.List;
32 import java.util.Optional;
33 import java.util.stream.Collectors;
34 import lombok.AccessLevel;
35 import lombok.NoArgsConstructor;
36 import lombok.extern.slf4j.Slf4j;
37 import org.onap.cps.spi.exceptions.DataValidationException;
38 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
39 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
40 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
41 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
42 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
43 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
44 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
45 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
46 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
47 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
48 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
51 @NoArgsConstructor(access = AccessLevel.PRIVATE)
52 public class YangUtils {
54 private static final String XPATH_DELIMITER_REGEX = "\\/";
55 private static final String XPATH_NODE_KEY_ATTRIBUTES_REGEX = "\\[.+";
58 * Parses jsonData into NormalizedNode according to given schema context.
60 * @param jsonData json data as string
61 * @param schemaContext schema context describing associated data model
62 * @return the NormalizedNode object
64 public static NormalizedNode<?, ?> parseJsonData(final String jsonData, final SchemaContext schemaContext) {
65 return parseJsonData(jsonData, schemaContext, Optional.empty());
69 * Parses jsonData into NormalizedNode according to given schema context.
71 * @param jsonData json data fragment as string
72 * @param schemaContext schema context describing associated data model
73 * @param parentNodeXpath the xpath referencing the parent node current data fragment belong to
74 * @return the NormalizedNode object
76 public static NormalizedNode<?, ?> parseJsonData(final String jsonData, final SchemaContext schemaContext,
77 final String parentNodeXpath) {
78 final DataSchemaNode parentSchemaNode = getDataSchemaNodeByXpath(parentNodeXpath, schemaContext);
79 return parseJsonData(jsonData, schemaContext, Optional.of(parentSchemaNode));
82 private static NormalizedNode<?, ?> parseJsonData(final String jsonData, final SchemaContext schemaContext,
83 final Optional<DataSchemaNode> optionalParentSchemaNode) {
84 final JSONCodecFactory jsonCodecFactory = JSONCodecFactorySupplier.DRAFT_LHOTKA_NETMOD_YANG_JSON_02
85 .getShared(schemaContext);
86 final NormalizedNodeResult normalizedNodeResult = new NormalizedNodeResult();
87 final NormalizedNodeStreamWriter normalizedNodeStreamWriter = ImmutableNormalizedNodeStreamWriter
88 .from(normalizedNodeResult);
90 try (final JsonParserStream jsonParserStream = optionalParentSchemaNode.isPresent()
91 ? JsonParserStream.create(normalizedNodeStreamWriter, jsonCodecFactory, optionalParentSchemaNode.get())
92 : JsonParserStream.create(normalizedNodeStreamWriter, jsonCodecFactory)
94 final JsonReader jsonReader = new JsonReader(new StringReader(jsonData));
95 jsonParserStream.parse(jsonReader);
97 } catch (final IOException | IllegalStateException | JsonSyntaxException exception) {
98 throw new DataValidationException(
99 "Failed to parse json data: " + jsonData, exception.getMessage(), exception);
101 return normalizedNodeResult.getResult();
105 * Create an xpath form a Yang Tools NodeIdentifier (i.e. PathArgument).
107 * @param nodeIdentifier the NodeIdentifier
110 public static String buildXpath(final YangInstanceIdentifier.PathArgument nodeIdentifier) {
111 final StringBuilder xpathBuilder = new StringBuilder();
112 xpathBuilder.append("/").append(nodeIdentifier.getNodeType().getLocalName());
114 if (nodeIdentifier instanceof YangInstanceIdentifier.NodeIdentifierWithPredicates) {
115 xpathBuilder.append(getKeyAttributesStatement(
116 (YangInstanceIdentifier.NodeIdentifierWithPredicates) nodeIdentifier));
118 return xpathBuilder.toString();
121 private static String getKeyAttributesStatement(
122 final YangInstanceIdentifier.NodeIdentifierWithPredicates nodeIdentifier) {
123 final List<String> keyAttributes = nodeIdentifier.entrySet().stream().map(
125 final String name = entry.getKey().getLocalName();
126 final String value = String.valueOf(entry.getValue()).replace("'", "\\'");
127 return String.format("@%s='%s'", name, value);
129 ).collect(Collectors.toList());
131 if (keyAttributes.isEmpty()) {
134 Collections.sort(keyAttributes);
135 return "[" + String.join(" and ", keyAttributes) + "]";
139 private static DataSchemaNode getDataSchemaNodeByXpath(final String parentNodeXpath,
140 final SchemaContext schemaContext) {
141 final String[] xpathNodeIdSequence = xpathToNodeIdSequence(parentNodeXpath);
142 return findDataSchemaNodeByXpathNodeIdSequence(xpathNodeIdSequence, schemaContext.getChildNodes());
145 private static String[] xpathToNodeIdSequence(final String xpath) {
146 final String[] xpathNodeIdSequence = Arrays.stream(xpath.split(XPATH_DELIMITER_REGEX))
147 .map(identifier -> identifier.replaceFirst(XPATH_NODE_KEY_ATTRIBUTES_REGEX, ""))
148 .filter(identifier -> !identifier.isEmpty())
149 .toArray(String[]::new);
150 if (xpathNodeIdSequence.length < 1) {
151 throw new DataValidationException("Invalid xpath.", "Xpath contains no node identifiers.");
153 return xpathNodeIdSequence;
156 private static DataSchemaNode findDataSchemaNodeByXpathNodeIdSequence(final String[] xpathNodeIdSequence,
157 final Collection<? extends DataSchemaNode> dataSchemaNodes) {
158 final String currentXpathNodeId = xpathNodeIdSequence[0];
159 final DataSchemaNode currentDataSchemaNode = dataSchemaNodes.stream()
160 .filter(dataSchemaNode -> currentXpathNodeId.equals(dataSchemaNode.getQName().getLocalName()))
161 .findFirst().orElseThrow(() -> schemaNodeNotFoundException(currentXpathNodeId));
162 if (xpathNodeIdSequence.length <= 1) {
163 return currentDataSchemaNode;
165 if (currentDataSchemaNode instanceof DataNodeContainer) {
166 return findDataSchemaNodeByXpathNodeIdSequence(
167 getNextLevelXpathNodeIdSequence(xpathNodeIdSequence),
168 ((DataNodeContainer) currentDataSchemaNode).getChildNodes());
170 throw schemaNodeNotFoundException(xpathNodeIdSequence[1]);
173 private static String[] getNextLevelXpathNodeIdSequence(final String[] xpathNodeIdSequence) {
174 final String[] nextXpathNodeIdSequence = new String[xpathNodeIdSequence.length - 1];
175 System.arraycopy(xpathNodeIdSequence, 1, nextXpathNodeIdSequence, 0, nextXpathNodeIdSequence.length);
176 return nextXpathNodeIdSequence;
179 private static DataValidationException schemaNodeNotFoundException(final String schemaNodeIdentifier) {
180 return new DataValidationException("Invalid xpath.",
181 String.format("No schema node was found for xpath identifier '%s'.", schemaNodeIdentifier));