external/storm-sqe/src/main/java/com/jwplayer/sqe/trident/function/RoundDate.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package com.jwplayer.sqe.trident.function;

import org.apache.storm.trident.operation.BaseFunction;
import org.apache.storm.trident.operation.TridentCollector;
import org.apache.storm.trident.tuple.TridentTuple;
import org.apache.storm.tuple.Values;

import java.util.Date;


public class RoundDate extends BaseFunction {
    @Override
    public void execute(TridentTuple tuple, TridentCollector collector) {
        try {
            Date date = (Date) tuple.get(0);
            Integer amount = ((Number) tuple.get(1)).intValue();
            String unit = tuple.getString(2);
            Long time = date.getTime();
            Long adjustment;

            switch(unit.toLowerCase()) {
                case "second":
                    adjustment = 1000l * amount;
                    break;
                case "minute":
                    adjustment = 60000l * amount;
                    break;
                case "hour":
                    adjustment = 3600000l * amount;
                    break;
                case "day":
                    adjustment = 86400000l * amount;
                    break;
                default:
                    throw new RuntimeException(unit + " is not a valid unit");
            }

            time = time / adjustment * adjustment;
            collector.emit(new Values(new Date(time)));
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}