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.stream.JsonReader;
25 import java.io.IOException;
26 import java.io.StringReader;
27 import java.util.Arrays;
28 import java.util.Collection;
29 import java.util.Collections;
30 import java.util.List;
31 import java.util.Optional;
32 import java.util.stream.Collectors;
33 import lombok.AccessLevel;
34 import lombok.NoArgsConstructor;
35 import lombok.extern.slf4j.Slf4j;
36 import org.onap.cps.spi.exceptions.DataValidationException;
37 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
38 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
39 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
40 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
41 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
42 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
43 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
44 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
45 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
46 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
47 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
50 @NoArgsConstructor(access = AccessLevel.PRIVATE)
51 public class YangUtils {
53 private static final String XPATH_DELIMITER_REGEX = "\\/";
54 private static final String XPATH_NODE_KEY_ATTRIBUTES_REGEX = "\\[.+";
57 * Parses jsonData into NormalizedNode according to given schema context.
59 * @param jsonData json data as string
60 * @param schemaContext schema context describing associated data model
61 * @return the NormalizedNode object
63 public static NormalizedNode<?, ?> parseJsonData(final String jsonData, final SchemaContext schemaContext) {
64 return parseJsonData(jsonData, schemaContext, Optional.empty());
68 * Parses jsonData into NormalizedNode according to given schema context.
70 * @param jsonData json data fragment as string
71 * @param schemaContext schema context describing associated data model
72 * @param parentNodeXpath the xpath referencing the parent node current data fragment belong to
73 * @return the NormalizedNode object
75 public static NormalizedNode<?, ?> parseJsonData(final String jsonData, final SchemaContext schemaContext,
76 final String parentNodeXpath) {
77 final DataSchemaNode parentSchemaNode = getDataSchemaNodeByXpath(parentNodeXpath, schemaContext);
78 return parseJsonData(jsonData, schemaContext, Optional.of(parentSchemaNode));
81 private static NormalizedNode<?, ?> parseJsonData(final String jsonData, final SchemaContext schemaContext,
82 final Optional<DataSchemaNode> optionalParentSchemaNode) {
83 final JSONCodecFactory jsonCodecFactory = JSONCodecFactorySupplier.DRAFT_LHOTKA_NETMOD_YANG_JSON_02
84 .getShared(schemaContext);
85 final NormalizedNodeResult normalizedNodeResult = new NormalizedNodeResult();
86 final NormalizedNodeStreamWriter normalizedNodeStreamWriter = ImmutableNormalizedNodeStreamWriter
87 .from(normalizedNodeResult);
89 try (final JsonParserStream jsonParserStream = optionalParentSchemaNode.isPresent()
90 ? JsonParserStream.create(normalizedNodeStreamWriter, jsonCodecFactory, optionalParentSchemaNode.get())
91 : JsonParserStream.create(normalizedNodeStreamWriter, jsonCodecFactory)
93 final JsonReader jsonReader = new JsonReader(new StringReader(jsonData));
94 jsonParserStream.parse(jsonReader);
96 } catch (final IOException | IllegalStateException e) {
97 throw new DataValidationException("Failed to parse json data.", String
98 .format("Exception occurred on parsing string %s.", jsonData), e);
100 return normalizedNodeResult.getResult();
104 * Create an xpath form a Yang Tools NodeIdentifier (i.e. PathArgument).
106 * @param nodeIdentifier the NodeIdentifier
109 public static String buildXpath(final YangInstanceIdentifier.PathArgument nodeIdentifier) {
110 final StringBuilder xpathBuilder = new StringBuilder();
111 xpathBuilder.append("/").append(nodeIdentifier.getNodeType().getLocalName());
113 if (nodeIdentifier instanceof YangInstanceIdentifier.NodeIdentifierWithPredicates) {
114 xpathBuilder.append(getKeyAttributesStatement(
115 (YangInstanceIdentifier.NodeIdentifierWithPredicates) nodeIdentifier));
117 return xpathBuilder.toString();
120 private static String getKeyAttributesStatement(
121 final YangInstanceIdentifier.NodeIdentifierWithPredicates nodeIdentifier) {
122 final List<String> keyAttributes = nodeIdentifier.entrySet().stream().map(
124 final String name = entry.getKey().getLocalName();
125 final String value = String.valueOf(entry.getValue()).replace("'", "\\'");
126 return String.format("@%s='%s'", name, value);
128 ).collect(Collectors.toList());
130 if (keyAttributes.isEmpty()) {
133 Collections.sort(keyAttributes);
134 return "[" + String.join(" and ", keyAttributes) + "]";
138 private static DataSchemaNode getDataSchemaNodeByXpath(final String parentNodeXpath,
139 final SchemaContext schemaContext) {
140 final String[] xpathNodeIdSequence = xpathToNodeIdSequence(parentNodeXpath);
141 return findDataSchemaNodeByXpathNodeIdSequence(xpathNodeIdSequence, schemaContext.getChildNodes());
144 private static String[] xpathToNodeIdSequence(final String xpath) {
145 final String[] xpathNodeIdSequence = Arrays.stream(xpath.split(XPATH_DELIMITER_REGEX))
146 .map(identifier -> identifier.replaceFirst(XPATH_NODE_KEY_ATTRIBUTES_REGEX, ""))
147 .filter(identifier -> !identifier.isEmpty())
148 .toArray(String[]::new);
149 if (xpathNodeIdSequence.length < 1) {
150 throw new DataValidationException("Invalid xpath.", "Xpath contains no node identifiers.");
152 return xpathNodeIdSequence;
155 private static DataSchemaNode findDataSchemaNodeByXpathNodeIdSequence(final String[] xpathNodeIdSequence,
156 final Collection<? extends DataSchemaNode> dataSchemaNodes) {
157 final String currentXpathNodeId = xpathNodeIdSequence[0];
158 final DataSchemaNode currentDataSchemaNode = dataSchemaNodes.stream()
159 .filter(dataSchemaNode -> currentXpathNodeId.equals(dataSchemaNode.getQName().getLocalName()))
160 .findFirst().orElseThrow(() -> schemaNodeNotFoundException(currentXpathNodeId));
161 if (xpathNodeIdSequence.length <= 1) {
162 return currentDataSchemaNode;
164 if (currentDataSchemaNode instanceof DataNodeContainer) {
165 return findDataSchemaNodeByXpathNodeIdSequence(
166 getNextLevelXpathNodeIdSequence(xpathNodeIdSequence),
167 ((DataNodeContainer) currentDataSchemaNode).getChildNodes());
169 throw schemaNodeNotFoundException(xpathNodeIdSequence[1]);
172 private static String[] getNextLevelXpathNodeIdSequence(final String[] xpathNodeIdSequence) {
173 final String[] nextXpathNodeIdSequence = new String[xpathNodeIdSequence.length - 1];
174 System.arraycopy(xpathNodeIdSequence, 1, nextXpathNodeIdSequence, 0, nextXpathNodeIdSequence.length);
175 return nextXpathNodeIdSequence;
178 private static DataValidationException schemaNodeNotFoundException(final String schemaNodeIdentifier) {
179 return new DataValidationException("Invalid xpath.",
180 String.format("No schema node was found for xpath identifier '%s'.", schemaNodeIdentifier));