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package time;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import org.apache.hadoop.hive.ql.exec.UDF;

public final class get_hour_timekey extends UDF
{
SimpleDateFormat df = new SimpleDateFormat(“yyyyMMddHH”);// 设置日期格式20170101
String PVVT_HOUR = “”;
String PVVT_TIMEKEY = “”;
String PVVT_LASTHOUR = “”;
String PVVO_RETURN_VALUE = “”;
Calendar calendar = Calendar.getInstance();

@SuppressWarnings("static-access")
public String evaluate(String timekey) throws ParseException 
{
	if (timekey == null || timekey.length() == 0) 
		return null; 
	
	timekey = timekey.replace("/", "").replace("\\", "").replace("-", "").replace("_", "").replace(":", "").replace(" ", "");
	
	if (timekey.length() < 12) 
		return null;
	
	PVVT_HOUR = timekey.substring(0, 10);
	PVVT_TIMEKEY = timekey.substring(0, 12);

	Calendar calendar = Calendar.getInstance();
	calendar.setTime(df.parse(PVVT_HOUR));
	calendar.add(calendar.HOUR, -1);
	PVVT_LASTHOUR = df.format(calendar.getTime());

	if (Double.valueOf(PVVT_TIMEKEY) >= Double.valueOf(PVVT_HOUR + "30")) 
		PVVO_RETURN_VALUE = PVVT_HOUR.substring(0,8) + " " + PVVT_HOUR.substring(8, 10) + "30";
	else
		PVVO_RETURN_VALUE = PVVT_LASTHOUR.substring(0,8) + " " + PVVT_LASTHOUR.substring(8, 10) + "30";
	
	return PVVO_RETURN_VALUE;
}

public static void main(String[] args) throws ParseException 
{
	get_hour_timekey timekey = new get_hour_timekey();
	System.out.println(timekey.evaluate(""));
}
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}