import org.springframework.data.convert.WritingConverter; //导入依赖的package包/类
private void registerConversion(Object converter) {
	Class<?> type = converter.getClass();
	boolean isWriting = type.isAnnotationPresent(WritingConverter.class);
	boolean isReading = type.isAnnotationPresent(ReadingConverter.class);

	if (!isReading && !isWriting) {
		isReading = true;
		isWriting = true;
	}

	if (converter instanceof GenericConverter) {
		GenericConverter genericConverter = (GenericConverter) converter;
		for (ConvertiblePair pair : genericConverter.getConvertibleTypes()) {
			register(new ConvertibleContext(pair, isReading, isWriting));
		}
	} else if (converter instanceof Converter) {
		Class<?>[] arguments = GenericTypeResolver.resolveTypeArguments(converter.getClass(), Converter.class);
		register(new ConvertibleContext(arguments[0], arguments[1], isReading, isWriting));
	} else {
		throw new IllegalArgumentException("Unsupported Converter type! Expected either GenericConverter if Converter.");
	}
}
 

import org.springframework.data.convert.WritingConverter; //导入依赖的package包/类
/**
 * Registers a conversion for the given converter. Inspects either generics or the convertible pairs returned
 * by a {@link GenericConverter}.
 *
 * @param converter the converter to register.
 */
private void registerConversion(final Object converter) {
  Class<?> type = converter.getClass();
  boolean isWriting = type.isAnnotationPresent(WritingConverter.class);
  boolean isReading = type.isAnnotationPresent(ReadingConverter.class);

  if (converter instanceof GenericConverter) {
    GenericConverter genericConverter = (GenericConverter) converter;
    for (GenericConverter.ConvertiblePair pair : genericConverter.getConvertibleTypes()) {
      register(new ConverterRegistration(pair, isReading, isWriting));
    }
  } else if (converter instanceof Converter) {
    Class<?>[] arguments = GenericTypeResolver.resolveTypeArguments(converter.getClass(), Converter.class);
    register(new ConverterRegistration(arguments[0], arguments[1], isReading, isWriting));
  } else {
    throw new IllegalArgumentException("Unsupported Converter type!");
  }
}