code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.skywalking.oap.server.library.util;
  
  import com.google.protobuf.BytesValue;
  import com.google.protobuf.Message;
  import com.google.protobuf.util.JsonFormat;
  import java.io.IOException;
  
  public class ProtoBufJsonUtils {
  
      public static String toJSON(Message sourceMessage) throws IOException {
          return JsonFormat.printer()
                           .usingTypeRegistry(
                               JsonFormat
                                   .TypeRegistry
                                   .newBuilder()
                                   .add(BytesValue.getDescriptor())
                                   .build()
                           )
                           .print(sourceMessage);
      }
  
      /**
       * Extract data from a JSON String and use them to construct a Protocol Buffers Message.
       *
       * @param json          A JSON data string to parse
       * @param targetBuilder A Message builder to use to construct the resulting Message
       * @throws com.google.protobuf.InvalidProtocolBufferException Thrown in case of invalid Message data
       */
      public static void fromJSON(String json, Message.Builder targetBuilder) throws IOException {
          JsonFormat.parser()
                    .usingTypeRegistry(
                        JsonFormat.TypeRegistry.newBuilder()
                                               .add(targetBuilder.getDescriptorForType())
                                               .build())
                    .ignoringUnknownFields()
                    .merge(json, targetBuilder);
      }
  }
  