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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2020 Nordix Foundation
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.utils;
import com.google.gson.stream.JsonReader;
import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.util.Collection;
import java.util.Iterator;
import java.util.ServiceLoader;
import java.util.logging.Logger;
import org.onap.cps.api.impl.Fragment;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.ValueNode;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
import org.opendaylight.yangtools.yang.model.api.Module;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;
import org.opendaylight.yangtools.yang.model.parser.api.YangParser;
import org.opendaylight.yangtools.yang.model.parser.api.YangParserException;
import org.opendaylight.yangtools.yang.model.parser.api.YangParserFactory;
import org.opendaylight.yangtools.yang.model.repo.api.StatementParserMode;
import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
public class YangUtils {
private static final YangParserFactory PARSER_FACTORY;
private static final Logger LOGGER = Logger.getLogger(YangUtils.class.getName());
private YangUtils() {
throw new IllegalStateException("Utility class");
}
static {
final Iterator<YangParserFactory> it = ServiceLoader.load(YangParserFactory.class).iterator();
if (!it.hasNext()) {
throw new IllegalStateException("No YangParserFactory found");
}
PARSER_FACTORY = it.next();
}
/**
* Parse a file containing yang modules.
*
* @param yangModelFile a file containing one or more yang modules. The file has to have a .yang extension.
* @return a SchemaContext representing the yang model
* @throws IOException when the system as an IO issue
* @throws YangParserException when the file does not contain a valid yang structure
*/
public static SchemaContext parseYangModelFile(final File yangModelFile) throws IOException, YangParserException {
final YangTextSchemaSource yangTextSchemaSource = YangTextSchemaSource.forFile(yangModelFile);
final YangParser yangParser = PARSER_FACTORY
.createParser(StatementParserMode.DEFAULT_MODE);
yangParser.addSource(yangTextSchemaSource);
return yangParser.buildEffectiveModel();
}
/**
* Parse a file containing json data for a certain model (schemaContext).
*
* @param jsonData a string containing json data for the given model
* @param schemaContext the SchemaContext for the given data
* @return the NormalizedNode representing the json data
*/
public static NormalizedNode<?, ?> parseJsonData(final String jsonData, final SchemaContext schemaContext)
throws IOException {
final JSONCodecFactory jsonCodecFactory = JSONCodecFactorySupplier.DRAFT_LHOTKA_NETMOD_YANG_JSON_02
.getShared(schemaContext);
final NormalizedNodeResult normalizedNodeResult = new NormalizedNodeResult();
final NormalizedNodeStreamWriter normalizedNodeStreamWriter = ImmutableNormalizedNodeStreamWriter
.from(normalizedNodeResult);
try (final JsonParserStream jsonParserStream = JsonParserStream
.create(normalizedNodeStreamWriter, jsonCodecFactory)) {
final JsonReader jsonReader = new JsonReader(new StringReader(jsonData));
jsonParserStream.parse(jsonReader);
}
return normalizedNodeResult.getResult();
}
/**
* Break a Normalized Node tree into fragments that can be stored by the persistence service.
*
* @param tree the normalized node tree
* @param module the module applicable for the data in the normalized node
* @return the 'root' Fragment for the tree contain all relevant children etc.
*/
public static Fragment fragmentNormalizedNode(
final NormalizedNode<? extends YangInstanceIdentifier.PathArgument, ?> tree,
final Module module) {
final QName nodeType = tree.getNodeType();
final Fragment rootFragment = Fragment.createRootFragment(module, nodeType);
fragmentNormalizedNode(rootFragment, tree);
return rootFragment;
}
private static void fragmentNormalizedNode(final Fragment currentFragment,
final NormalizedNode normalizedNode) {
if (normalizedNode instanceof DataContainerNode) {
inspectContainer(currentFragment, (DataContainerNode) normalizedNode);
} else if (normalizedNode instanceof MapNode) {
inspectKeyedList(currentFragment, (MapNode) normalizedNode);
} else if (normalizedNode instanceof ValueNode) {
inspectLeaf(currentFragment, (ValueNode) normalizedNode);
} else if (normalizedNode instanceof LeafSetNode) {
inspectLeafList(currentFragment, (LeafSetNode) normalizedNode);
} else {
LOGGER.warning("Cannot normalize " + normalizedNode.getClass());
}
}
private static void inspectLeaf(final Fragment currentFragment,
final ValueNode valueNode) {
final Object value = valueNode.getValue();
currentFragment.addLeafValue(valueNode.getNodeType().getLocalName(), value);
}
private static void inspectLeafList(final Fragment currentFragment,
final LeafSetNode leafSetNode) {
currentFragment.addLeafListName(leafSetNode.getNodeType().getLocalName());
for (final NormalizedNode value : (Collection<NormalizedNode>) leafSetNode.getValue()) {
fragmentNormalizedNode(currentFragment, value);
}
}
private static void inspectContainer(final Fragment currentFragment,
final DataContainerNode dataContainerNode) {
final Collection<NormalizedNode> leaves = (Collection) dataContainerNode.getValue();
for (final NormalizedNode leaf : leaves) {
fragmentNormalizedNode(currentFragment, leaf);
}
}
private static void inspectKeyedList(final Fragment currentFragment,
final MapNode mapNode) {
createNodeForEachListElement(currentFragment, mapNode);
}
private static void createNodeForEachListElement(final Fragment currentFragment, final MapNode mapNode) {
final Collection<MapEntryNode> mapEntryNodes = mapNode.getValue();
for (final MapEntryNode mapEntryNode : mapEntryNodes) {
final Fragment listElementFragment = currentFragment.createChildFragment(mapNode.getNodeType());
fragmentNormalizedNode(listElementFragment, mapEntryNode);
}
}
}
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