package us.codecraft.webmagic.model.formatter;
   
   import us.codecraft.webmagic.model.annotation.Formatter;
   
   import java.lang.reflect.Field;
   import java.util.List;
   
   /**
    * @author code4crafter@gmail.com
   * @since 0.7.0
   *         Date: 2017/6/3
   */
  public class ObjectFormatterBuilder {
  
      private Field field;
  
      public ObjectFormatterBuilder setField(Field field) {
          this.field = field;
          return this;
      }
  
      private ObjectFormatter initFormatterForType(Class<?> fieldClazz, String[] params) {
          if (fieldClazz.equals(String.class) || List.class.isAssignableFrom(fieldClazz)){
              return null;
          }
          Class<? extends ObjectFormatter> formatterClass = ObjectFormatters.get(BasicTypeFormatter.detectBasicClass(fieldClazz));
          if (formatterClass == null) {
              throw new IllegalStateException("Can't find formatter for field " + field.getName() + " of type " + fieldClazz);
          }
          return initFormatter(formatterClass, params);
      }
  
      private ObjectFormatter initFormatter(Class<? extends ObjectFormatter> formatterClazz, String[] params) {
          try {
              ObjectFormatter objectFormatter = formatterClazz.newInstance();
              objectFormatter.initParam(params);
              return objectFormatter;
          } catch (InstantiationException e) {
              throw new RuntimeException(e);
          } catch (IllegalAccessException e) {
              throw new RuntimeException(e);
          }
      }
  
      public ObjectFormatter build() {
          Formatter formatter = field.getAnnotation(Formatter.class);
          if (formatter != null && !formatter.formatter().equals(Formatter.DEFAULT_FORMATTER)) {
              return initFormatter(formatter.formatter(), formatter.value());
          }
          if (formatter == null || formatter.subClazz().equals(Void.class)) {
              return initFormatterForType(field.getType(), formatter != null ? formatter.value() : null);
          } else {
              return initFormatterForType(formatter.subClazz(), formatter.value());
          }
      }
  }