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.ambari.server.state.repository;
  
  import java.lang.reflect.Type;
  import java.util.List;
  import java.util.Map;
  
  import com.google.gson.JsonDeserializationContext;
  import com.google.gson.JsonDeserializer;
  import com.google.gson.JsonElement;
  import com.google.gson.JsonParseException;
  import com.google.gson.annotations.SerializedName;
  import com.google.gson.reflect.TypeToken;
  
  /**
   * Represents the data inside of the {@code stack_packages.json}.
   */
  public class StackPackage {
  
    /**
     * The upgrade dependencies, if any. Will be {@code null} if none.
     */
    @SerializedName("upgrade-dependencies")
    public UpgradeDependencies upgradeDependencies;
  
    /**
     * The upgrade dependencies between services.
     */
    public static class UpgradeDependencies {
      Map<String, List<String>> dependencies;
    }
  
    /**
     * A deserializer which extracts the "upgrade-dependencies" key from the
     * stack_packages.json.
     */
    public static class UpgradeDependencyDeserializer
        implements JsonDeserializer<UpgradeDependencies> {
      /**
       * {@inheritDoc}
       */
      @Override
      public UpgradeDependencies deserialize(JsonElement json, Type typeOfT,
          JsonDeserializationContext context) throws JsonParseException {
        Type mapType = new TypeToken<Map<String, List<String>>>() {}.getType();
        Map<String, List<String>> data = context.deserialize(json, mapType);
  
        UpgradeDependencies upgradeDependencies = new UpgradeDependencies();
        upgradeDependencies.dependencies = data;
        return upgradeDependencies;
      }
    }
  }
  