Spring TypeConverter

public interface TypeConverter {

	/**
	 * 将 value 转换成 requiredType 类型
	 */
	@Nullable
	<T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType) throws TypeMismatchException;

	/**
     * 将 value 转换成 requiredType 类型, 并且传递 转换方法和转换参数
	 */
	@Nullable
	<T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType,
			@Nullable MethodParameter methodParam) throws TypeMismatchException;

	/**
	 */
	@Nullable
	<T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType, @Nullable Field field)
			throws TypeMismatchException;

	/**
	 */
	@Nullable
	default <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType,
			@Nullable TypeDescriptor typeDescriptor) throws TypeMismatchException {

		throw new UnsupportedOperationException("TypeDescriptor resolution not supported");
	}

}