content: // 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.cloudstack.transport;
  
  import com.cloud.hypervisor.Hypervisor.HypervisorType;
  import com.google.gson.JsonDeserializationContext;
  import com.google.gson.JsonDeserializer;
  import com.google.gson.JsonElement;
  import com.google.gson.JsonNull;
  import com.google.gson.JsonParseException;
  import com.google.gson.JsonPrimitive;
  import com.google.gson.JsonSerializationContext;
  import com.google.gson.JsonSerializer;
  
  import java.lang.reflect.Type;
  
  /**
   * {@link HypervisorType} acts as extendable set of singleton objects and should return same result when used "=="
   * or {@link Object#equals(Object)}.
   * To support that, need to return existing object for a given name instead of creating new.
   */
  public class HypervisorTypeAdaptor implements JsonDeserializer<HypervisorType>, JsonSerializer<HypervisorType> {
      @Override
      public HypervisorType deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
          if (json instanceof JsonPrimitive && ((JsonPrimitive) json).isString()) {
              return HypervisorType.valueOf(json.getAsString());
          }
          return null;
      }
  
      @Override
      public JsonElement serialize(HypervisorType src, Type typeOfSrc, JsonSerializationContext context) {
          String name = src.name();
          if (name == null) {
              return new JsonNull();
          }
          return new JsonPrimitive(name);
      }
  }
  