package brickhouse.udf.date;
/**
* Copyright 2012 Klout, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**/
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.log4j.Logger;
import org.joda.time.DateTime;
import org.joda.time.Days;
import org.joda.time.format.DateTimeFormatter;
/**
* Given two dates in YYYYMMDD,
* return the number of days between
* midnight on each day..
* <p/>
* day_diff( "20120701", "20120702") == 1
* day_diff( "20120701", "20120701") == 0
*/
@Description(
name = "day_diff",
value = " The difference in days of two YYYYMMDD dates"
)
public class DayDiffUDF extends UDF {
private static final Logger LOG = Logger.getLogger(DayDiffUDF.class);
private static final DateTimeFormatter YYYYMMDD = org.joda.time.format.DateTimeFormat.forPattern("YYYYMMdd");
public Integer evaluate(String date1Str, String date2Str) {
DateTime dt1 = YYYYMMDD.parseDateTime(date1Str);
DateTime dt2 = YYYYMMDD.parseDateTime(date2Str);
int dayDiff = Days.daysBetween(dt1, dt2).getDays();
return dayDiff;
}
}