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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* 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.
*/
package io.fd.honeycomb.translate.util;
import com.google.common.base.Charsets;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
import org.opendaylight.yangtools.yang.data.codec.gson.JSONNormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
import org.opendaylight.yangtools.yang.data.codec.gson.JsonWriterFactory;
import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.DataContainerNodeAttrBuilder;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;
import org.opendaylight.yangtools.yang.model.api.SchemaNode;
import org.opendaylight.yangtools.yang.model.api.SchemaPath;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class JsonUtils {
private static final Logger LOG = LoggerFactory.getLogger(JsonUtils.class);
private JsonUtils() {}
/**
* Serialize normalized node root structure into provided output stream.
*
* @throws IOException if serialized data cannot be written into provided output stream
*/
public static void writeJsonRoot(@Nonnull final NormalizedNode<?, ?> rootData,
@Nonnull final SchemaContext schemaContext,
@Nonnull final OutputStream outputStream) throws IOException {
final JsonWriter
jsonWriter = createJsonWriter(outputStream, true);
final NormalizedNodeStreamWriter streamWriter = JSONNormalizedNodeStreamWriter
.createNestedWriter(JSONCodecFactory.create(schemaContext), SchemaPath.ROOT, null, jsonWriter);
final NormalizedNodeWriter normalizedNodeWriter =
NormalizedNodeWriter.forStreamWriter(streamWriter, true);
jsonWriter.beginObject();
writeChildren(normalizedNodeWriter,(ContainerNode) rootData);
jsonWriter.endObject();
jsonWriter.flush();
}
/**
* Read json serialized normalized node root structure and parse them into normalized nodes
*
* @return artificial normalized node holding all the top level nodes from provided stream as children. In case
* the stream is empty, empty artificial normalized node is returned
*
* @throws IllegalArgumentException if content in the provided input stream is not restore-able
*/
public static ContainerNode readJsonRoot(@Nonnull final SchemaContext schemaContext,
@Nonnull final InputStream stream) {
// if root node, parent schema == schema context
return readJson(schemaContext, stream, schemaContext);
}
public static ContainerNode readJson(@Nonnull final SchemaContext schemaContext,
@Nonnull final InputStream stream,
@Nonnull final SchemaNode parentSchema) {
final DataContainerNodeAttrBuilder<YangInstanceIdentifier.NodeIdentifier, ContainerNode> builder =
Builders.containerBuilder().withNodeIdentifier(new YangInstanceIdentifier.NodeIdentifier(schemaContext.getQName()));
final NormalizedNodeStreamWriter writer = ImmutableNormalizedNodeStreamWriter.from(builder);
try (final JsonParserStream jsonParser = JsonParserStream.create(writer, schemaContext, parentSchema)) {
final JsonReader reader = new JsonReader(new InputStreamReader(stream, Charsets.UTF_8));
jsonParser.parse(reader);
} catch (IOException e) {
LOG.warn("Unable to close json parser. Ignoring exception", e);
}
return builder.build();
}
private static void writeChildren(final NormalizedNodeWriter nnWriter, final ContainerNode data) throws IOException {
for (final DataContainerChild<? extends YangInstanceIdentifier.PathArgument, ?> child : data.getValue()) {
nnWriter.write(child);
}
}
private static JsonWriter createJsonWriter(final OutputStream entityStream, boolean prettyPrint) {
if (prettyPrint) {
return JsonWriterFactory.createJsonWriter(new OutputStreamWriter(entityStream, Charsets.UTF_8), 2);
} else {
return JsonWriterFactory.createJsonWriter(new OutputStreamWriter(entityStream, Charsets.UTF_8));
}
}
}
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