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ClickHouse Native Protocol JDBC implementation

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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 com.github.housepower.misc;

import com.github.housepower.client.NativeContext;
import com.github.housepower.settings.SettingKey;

import javax.annotation.Nullable;
import java.sql.Timestamp;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class DateTimeUtil {

    public static ZoneId chooseTimeZone(NativeContext.ServerContext serverContext) {
        return (boolean) serverContext.getConfigure().settings().getOrDefault(SettingKey.use_client_time_zone, false)
                ? ZoneId.systemDefault() : serverContext.timeZone();
    }

    public static LocalDateTime convertTimeZone(LocalDateTime localDateTime, ZoneId from, ZoneId to) {
        return localDateTime.atZone(from).withZoneSameInstant(to).toLocalDateTime();
    }

    public static long toEpochMilli(final ZonedDateTime zdt) {
        return zdt.toInstant().toEpochMilli();
    }

    public static long toEpochSecond(final ZonedDateTime zdt) {
        return zdt.toInstant().getEpochSecond();
    }

    public static ZonedDateTime toZonedDateTime(final long seconds, final int nanos, final ZoneId tz) {
        Instant i = Instant.ofEpochSecond(seconds, nanos);
        return ZonedDateTime.ofInstant(i, tz);
    }

    public static ZonedDateTime toZonedDateTime(final Timestamp x, final ZoneId tz) {
        Instant i = Instant.ofEpochSecond(x.getTime() / 1000, x.getNanos());
        return ZonedDateTime.ofInstant(i, tz);
    }

    public static Timestamp toTimestamp(final ZonedDateTime zdt, @Nullable final ZoneId tz) {
        ZonedDateTime _zdt = tz == null ? zdt : zdt.withZoneSameLocal(tz);
        return Timestamp.from(_zdt.toInstant());
    }
}