Java如何转换protobuf-net中的bcl.DateTime对象

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一、定义DateTime Message

参考文档：https://github.com/mgravell/protobuf-net/blob/master/src/Tools/bcl.proto

message DateTime

{

  optional sint64 value = ; // the offset (in units of the selected scale) from 1970/01/01

  optional TimeSpanScale scale =  [default = DAYS]; // the scale of the timespan

  enum TimeSpanScale

  {

    DAYS = ;

    HOURS = ;

    MINUTES = ;

    SECONDS = ;

    MILLISECONDS = ;

    TICKS = ;

    MINMAX = ; // dubious

  }

}

DateTime中包含两个属性：value，TimeSpanScale；
value为时间值，TimeSpanScale为时间模数：秒、微秒、毫微妙、Ticks；
Ticks是.net中的计时周期，参考：https://msdn.microsoft.com/zh-cn/library/system.datetime.ticks.aspx
1ticks=100毫微妙，10000ticks=1毫秒；

二、生成对应的Java类

protoc.exe -I=d:/tmp --java_out=d:/tmp d:/tmp/date_time.proto

三、解析C#DateTime为Java的java.util.Date

public class DateTimeUtil {

    private final static long TICKS_PER_MILLISECOND = ;

    /**

     * 将C#中的DateTime类型转为Java中的Date

     *

     * @param bclDateTime

     * @return

     */

    public final static Date fromDateTimeToDate(DateTime dateTime) {

        long timeLong = dateTime.getValue();

        DateTime.TimeSpanScale timeSpanScale = dateTime.getScale();

        Calendar c = Calendar.getInstance();

        TimeZone.setDefault(TimeZone.getTimeZone("UTC"));

        switch (timeSpanScale) {

        case DAYS:

            // 24 * 60 * 60 * 1000

            c.setTimeInMillis(timeLong * );

            return c.getTime();

        case HOURS:

            // 60 * 60 * 1000

            c.setTimeInMillis(timeLong * );

            return c.getTime();

        case MINUTES:

            // 60 * 1000

            c.setTimeInMillis(timeLong * );

            return c.getTime();

        case SECONDS:

            c.setTimeInMillis(timeLong * );

            return c.getTime();

        case MILLISECONDS:

            c.setTimeInMillis(timeLong);

            return c.getTime();

        case TICKS:

            c.setTimeInMillis(timeLong / TICKS_PER_MILLISECOND);

            return c.getTime();

        default:

            c.setTimeInMillis(0L);

            return c.getTime();

        }

    }

}