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/*
 * 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 io.prestosql.parquet;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.primitives.Ints;
import com.google.common.primitives.Longs;
import io.prestosql.spi.PrestoException;
import org.apache.parquet.io.api.Binary;

import java.util.concurrent.TimeUnit;

import static io.prestosql.spi.StandardErrorCode.NOT_SUPPORTED;

/**
 * Utility class for decoding INT96 encoded parquet timestamp to timestamp millis in GMT.
 * 

*/ public final class ParquetTimestampUtils { @VisibleForTesting static final int JULIAN_EPOCH_OFFSET_DAYS = 2_440_588; private static final long MILLIS_IN_DAY = TimeUnit.DAYS.toMillis(1); private static final long NANOS_PER_MILLISECOND = TimeUnit.MILLISECONDS.toNanos(1); private ParquetTimestampUtils() {} /** * Returns GMT timestamp from binary encoded parquet timestamp (12 bytes - julian date + time of day nanos). * * @param timestampBinary INT96 parquet timestamp * @return timestamp in millis, GMT timezone */ public static long getTimestampMillis(Binary timestampBinary) { if (timestampBinary.length() != 12) { throw new PrestoException(NOT_SUPPORTED, "Parquet timestamp must be 12 bytes, actual " + timestampBinary.length()); } byte[] bytes = timestampBinary.getBytes(); // little endian encoding - need to invert byte order long timeOfDayNanos = Longs.fromBytes(bytes[7], bytes[6], bytes[5], bytes[4], bytes[3], bytes[2], bytes[1], bytes[0]); int julianDay = Ints.fromBytes(bytes[11], bytes[10], bytes[9], bytes[8]); return julianDayToMillis(julianDay) + (timeOfDayNanos / NANOS_PER_MILLISECOND); } private static long julianDayToMillis(int julianDay) { return (julianDay - JULIAN_EPOCH_OFFSET_DAYS) * MILLIS_IN_DAY; } }





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