+/*
+ * ============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.opendaylight.yangtools.yang.common.Revision;
+import org.opendaylight.yangtools.yang.common.YangNames;
+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, IOException, YangSyntaxErrorException {
+ final SchemaContext schemaContext = generateSchemaContext(yangModelMap.build());
+ return new YangTextSchemaSourceSetImpl(schemaContext);
+ }
+
+ public static YangTextSchemaSourceSet of(final Map<String, String> yangResourceNameToContent)
+ throws ReactorException, IOException, 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 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 IOException, ReactorException, YangSyntaxErrorException {
+ final CrossSourceStatementReactor.BuildAction reactor = RFC7950Reactors.defaultReactor().newBuild();
+ final List<YangTextSchemaSource> yangTextSchemaSources = forResources(yangResourceNameToContent);
+ for (final YangTextSchemaSource yangTextSchemaSource : yangTextSchemaSources) {
+ reactor.addSource(YangStatementStreamSource.create(yangTextSchemaSource));
+ }
+ 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());
+ }
+ };
+ }
+}