org.calrissian.accumulorecipes.commons.support.TimeUnit.java Source code

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Here is the source code for org.calrissian.accumulorecipes.commons.support.TimeUnit.java

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/*
 * Copyright (C) 2013 The Calrissian Authors
 *
 * 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.
 */
package org.calrissian.accumulorecipes.commons.support;

import org.joda.time.DateTimeZone;
import org.joda.time.MutableDateTime;

public enum TimeUnit {
    MINUTES, HOURS, DAYS, MONTHS;

    public long normalize(long timestamp) {
        MutableDateTime ts = new MutableDateTime(timestamp, DateTimeZone.UTC);

        /**
         * NOTE: order of switch matters.
         *
         * This switch is designed to fall through from most to least significant. Zeroes all non significant
         * portions of the time before finally breaking at the end.
         */
        switch (this) {
        case MONTHS:
            ts.setDayOfMonth(1);
        case DAYS:
            ts.setHourOfDay(0);
        case HOURS:
            ts.setMinuteOfHour(0);
        case MINUTES:
            ts.setSecondOfMinute(0);
            ts.setMillisOfSecond(0);
            break;
        default:
            throw new IllegalArgumentException("Unsupported time unit");
        }

        return ts.getMillis();
    }

}