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.core.storage.type;
  
  import com.fasterxml.jackson.core.JsonGenerator;
  import com.fasterxml.jackson.databind.JsonSerializer;
  import com.fasterxml.jackson.databind.SerializerProvider;
  import com.fasterxml.jackson.databind.annotation.JsonSerialize;
  import java.io.IOException;
  
  /**
   * StorageDataComplexObject implementation supports String-Object interconversion.
   */
  @JsonSerialize(using = StorageDataComplexObject.Serializer.class)
  public interface StorageDataComplexObject<T> {
      /**
       * @return string representing this object.
       */
      String toStorageData();
  
      /**
       * Initialize this object based on the given string data.
       */
      void toObject(String data);
  
      /**
       * Initialize the object based on the given source.
       */
      void copyFrom(T source);
  
      final class Serializer extends JsonSerializer<StorageDataComplexObject<?>> {
          @Override
          public void serialize(
              final StorageDataComplexObject value,
              final JsonGenerator gen,
              final SerializerProvider provider)
              throws IOException {
              gen.writeString(value.toStorageData());
          }
      }
  }
  