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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2020 Pantheon.tech
* ================================================================================
* 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.yang;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ImmutableMap;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import org.onap.cps.spi.exceptions.CpsException;
import org.onap.cps.spi.model.ModuleReference;
import org.opendaylight.yangtools.yang.common.Revision;
import org.opendaylight.yangtools.yang.common.YangNames;
import org.opendaylight.yangtools.yang.model.api.Module;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;
import org.opendaylight.yangtools.yang.model.parser.api.YangSyntaxErrorException;
import org.opendaylight.yangtools.yang.model.repo.api.RevisionSourceIdentifier;
import org.opendaylight.yangtools.yang.model.repo.api.YangTextSchemaSource;
import org.opendaylight.yangtools.yang.parser.rfc7950.reactor.RFC7950Reactors;
import org.opendaylight.yangtools.yang.parser.rfc7950.repo.YangStatementStreamSource;
import org.opendaylight.yangtools.yang.parser.spi.meta.ReactorException;
import org.opendaylight.yangtools.yang.parser.stmt.reactor.CrossSourceStatementReactor;
public final class YangTextSchemaSourceSetBuilder {
private final ImmutableMap.Builder<String, String> yangModelMap = new ImmutableMap.Builder<>();
public YangTextSchemaSourceSetBuilder() {
}
public YangTextSchemaSourceSetBuilder put(final String fileName, final String content) {
this.yangModelMap.put(fileName, content);
return this;
}
public YangTextSchemaSourceSetBuilder putAll(final Map<String, String> yangResourceNameToContent) {
this.yangModelMap.putAll(yangResourceNameToContent);
return this;
}
public YangTextSchemaSourceSet build() throws ReactorException, YangSyntaxErrorException {
final SchemaContext schemaContext = generateSchemaContext(yangModelMap.build());
return new YangTextSchemaSourceSetImpl(schemaContext);
}
public static YangTextSchemaSourceSet of(final Map<String, String> yangResourceNameToContent)
throws ReactorException, YangSyntaxErrorException {
return new YangTextSchemaSourceSetBuilder().putAll(yangResourceNameToContent).build();
}
private static class YangTextSchemaSourceSetImpl implements YangTextSchemaSourceSet {
private final SchemaContext schemaContext;
public YangTextSchemaSourceSetImpl(final SchemaContext schemaContext) {
this.schemaContext = schemaContext;
}
@Override
public List<ModuleReference> getModuleReferences() {
return schemaContext.getModules().stream()
.map(YangTextSchemaSourceSetImpl::toModuleReference)
.collect(Collectors.toList());
}
private static ModuleReference toModuleReference(final Module module) {
return ModuleReference.builder()
.namespace(module.getName())
.revision(module.getRevision().map(Revision::toString).orElse(null))
.build();
}
@Override
public SchemaContext getSchemaContext() {
return schemaContext;
}
}
/**
* Parse and validate a string representing a yang model to generate a SchemaContext context.
*
* @param yangResourceNameToContent is a {@link Map} collection that contains the name of the model represented
* on yangModelContent as key and the yangModelContent as value.
* @return the schema context
*/
private SchemaContext generateSchemaContext(final Map<String, String> yangResourceNameToContent)
throws ReactorException, YangSyntaxErrorException {
final CrossSourceStatementReactor.BuildAction reactor = RFC7950Reactors.defaultReactor().newBuild();
final List<YangTextSchemaSource> yangTextSchemaSources = forResources(yangResourceNameToContent);
for (final YangTextSchemaSource yangTextSchemaSource : yangTextSchemaSources) {
try {
reactor.addSource(YangStatementStreamSource.create(yangTextSchemaSource));
} catch (final IOException e) {
throw new CpsException("Failed to read yangTextSchemaSource %s.",
yangTextSchemaSource.getIdentifier().getName(), e);
}
}
return reactor.buildEffective();
}
private List<YangTextSchemaSource> forResources(final Map<String, String> yangResourceNameToContent) {
return yangResourceNameToContent.entrySet().stream()
.map(entry -> toYangTextSchemaSource(entry.getKey(), entry.getValue()))
.collect(Collectors.toList());
}
private YangTextSchemaSource toYangTextSchemaSource(final String sourceName, final String source) {
final Map.Entry<String, String> sourceNameParsed = YangNames.parseFilename(sourceName);
final RevisionSourceIdentifier revisionSourceIdentifier = RevisionSourceIdentifier
.create(sourceNameParsed.getKey(), Revision.ofNullable(sourceNameParsed.getValue()));
return new YangTextSchemaSource(revisionSourceIdentifier) {
@Override
protected MoreObjects.ToStringHelper addToStringAttributes(
final MoreObjects.ToStringHelper toStringHelper) {
return toStringHelper;
}
@Override
public InputStream openStream() {
return new ByteArrayInputStream(source.getBytes());
}
};
}
}
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