package top.infra.jackson2;
   
   import static com.google.common.collect.Lists.newLinkedList;
   
   import com.fasterxml.jackson.databind.Module;
   
   import org.springframework.core.Ordered;
   import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
   
  import java.lang.reflect.Field;
  import java.util.List;
  
  /**
   * Created by zhanghaolun on 16/7/28.
   */
  public interface Jackson2BuilderCustomizer extends Ordered {
  
      void customize(Jackson2Properties properties, Jackson2ObjectMapperBuilder builder);
  
      default boolean createXmlMapper(final Jackson2ObjectMapperBuilder builder) {
          try {
              final boolean result;
              final Field fieldModules = builder.getClass().getDeclaredField("createXmlMapper");
              fieldModules.setAccessible(true);
              result = (boolean) fieldModules.get(builder);
              return result;
          } catch (final NoSuchFieldException | IllegalAccessException | IllegalArgumentException ex) {
              return false;
          }
      }
  
      default Boolean isXmlMapper(final Jackson2ObjectMapperBuilder builder) {
          return this.createXmlMapper(builder);
      }
  
      default ClassLoader moduleClassLoader(final Jackson2ObjectMapperBuilder builder) {
          try {
              final ClassLoader result;
              final Field fieldModuleClassLoader = builder.getClass().getDeclaredField("moduleClassLoader");
              fieldModuleClassLoader.setAccessible(true);
              result = (ClassLoader) fieldModuleClassLoader.get(builder);
              return result;
          } catch (final NoSuchFieldException | IllegalAccessException | IllegalArgumentException ex) {
              return builder.getClass().getClassLoader();
          }
      }
  
      @SuppressWarnings("unchecked")
      default List<Module> modules(final Jackson2ObjectMapperBuilder builder) {
          try {
              final List<Module> result;
              final Field fieldModules = builder.getClass().getDeclaredField("modules");
              fieldModules.setAccessible(true);
              result = (List<Module>) fieldModules.get(builder);
              return newLinkedList(result);
          } catch (final NoSuchFieldException | IllegalAccessException | IllegalArgumentException ex) {
              return newLinkedList();
          }
      }
  }