brickhouse.udf.date.AddISOPeriodUDF.java Source code

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Here is the source code for brickhouse.udf.date.AddISOPeriodUDF.java

Source

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);
    }
}