package brickhouse.udf.date;
/**
* Copyright 2015 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.UDF;
import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.PeriodFormatter;
/**
* UDF that receives date, date format (such as "YYYY-MM-dd HH:mm:ss") and
* period in ISO8601, it adds period in seconds to date.
*
* Example: add_iso_period(date, 'YYYY-MM-dd HH:mm:ss', 'PT02H00M')
*/
public class AddISOPeriodUDF extends UDF {
private static final PeriodFormatter periodFormatter = org.joda.time.format.ISOPeriodFormat
.standard();
public String evaluate(String dateString, String dateFormat, String periodString) {
if (dateString == null) {
return null;
}
if (dateFormat == null) {
dateFormat = "YYYY-MM-dd HH:mm:ss";
}
DateTimeFormatter dateFormatter = org.joda.time.format.DateTimeFormat.forPattern(dateFormat);
DateTime input = dateFormatter.parseDateTime(dateString);
Duration duration = periodFormatter.parsePeriod(periodString).toStandardDuration();
long seconds = duration.getStandardSeconds();
DateTime output = input.plusSeconds(Long.valueOf(seconds).intValue());
return dateFormatter.print(output);
}
}