package io.delphi.qa.auto.awsmfrw.common_baby.gson;

import com.google.gson.*;

import java.lang.reflect.Type;

public class ConvertibleDeserializer<T extends Convertible> implements JsonDeserializer<T> {

  private static final String CLASSNAME = "className";

  public T deserialize(
      final JsonElement jsonElement,
      final Type type,
      final JsonDeserializationContext deserializationContext)
      throws JsonParseException {
    final JsonObject jsonObject = jsonElement.getAsJsonObject();
    final JsonPrimitive prim = (JsonPrimitive) jsonObject.get(CLASSNAME);
    final String className = prim.getAsString();
    final Class<T> clazz = getClassInstance(className);
    return deserializationContext.deserialize(jsonObject, clazz);
  }

  @SuppressWarnings("unchecked")
  public Class<T> getClassInstance(String className) {
    try {
      return (Class<T>) Class.forName(className);
    } catch (ClassNotFoundException cnfe) {
      throw new JsonParseException(cnfe.getMessage());
    }
  }
}