io.questdb.griffin.engine.groupby.MonthTimestampSampler Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
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 *  you may not use this file except in compliance with the License.
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 *  http://www.apache.org/licenses/LICENSE-2.0
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.groupby;

import io.questdb.std.datetime.microtime.Timestamps;

class MonthTimestampSampler implements TimestampSampler {
    private final int bucket;

    MonthTimestampSampler(int bucket) {
        this.bucket = bucket;
    }

    @Override
    public long nextTimestamp(long timestamp) {
        return Timestamps.addMonths(timestamp, bucket);
    }

    @Override
    public long previousTimestamp(long timestamp) {
        return Timestamps.addMonths(timestamp, -bucket);
    }

    @Override
    public long round(long value) {
        int y = Timestamps.getYear(value);
        boolean l = Timestamps.isLeapYear(y);
        int m = Timestamps.getMonthOfYear(value, y, l);
        // target month
        int n = ((m - 1) / bucket) * bucket + 1;
        return Timestamps.yearMicros(y, l) +
                Timestamps.monthOfYearMicros(n, l);
    }
}