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The core of Neo4j Bolt Protocol, this contains the state machine for Bolt sessions.
There is a newer version: 5.26.1
/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.bolt.protocol.io.reader;

import static java.lang.String.format;

import java.time.DateTimeException;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.zone.ZoneRulesException;
import org.neo4j.bolt.protocol.io.StructType;
import org.neo4j.packstream.error.reader.PackstreamReaderException;
import org.neo4j.packstream.error.struct.IllegalStructArgumentException;
import org.neo4j.packstream.error.struct.IllegalStructSizeException;
import org.neo4j.packstream.io.PackstreamBuf;
import org.neo4j.packstream.struct.StructHeader;
import org.neo4j.packstream.struct.StructReader;
import org.neo4j.values.storable.DateTimeValue;

public final class DateTimeZoneIdReader implements StructReader {
    private static final DateTimeZoneIdReader INSTANCE = new DateTimeZoneIdReader<>();

    private DateTimeZoneIdReader() {}

    @SuppressWarnings("unchecked")
    public static  DateTimeZoneIdReader getInstance() {
        return (DateTimeZoneIdReader) INSTANCE;
    }

    @Override
    public short getTag() {
        return StructType.DATE_TIME_ZONE_ID.getTag();
    }

    @Override
    public DateTimeValue read(CTX ctx, PackstreamBuf buffer, StructHeader header) throws PackstreamReaderException {
        if (header.length() != 3) {
            throw new IllegalStructSizeException(3, header.length());
        }

        var epochSecond = buffer.readInt();
        var nanos = buffer.readInt();
        var zoneName = buffer.readString();

        if (nanos > Integer.MAX_VALUE || nanos < Integer.MIN_VALUE) {
            throw IllegalStructArgumentException.wrongTypeForFieldNameOrOutOfRange(
                    "nanoseconds", "INTEGER", Integer.MIN_VALUE, Integer.MAX_VALUE, nanos, "Value exceeds bounds");
        }

        Instant instant;
        ZoneId zoneId;
        try {
            instant = Instant.ofEpochSecond(epochSecond, nanos);
            zoneId = ZoneId.of(zoneName);
        } catch (ZoneRulesException ex) {
            throw new IllegalStructArgumentException("tz_id", format("Illegal zone identifier: \"%s\"", zoneName), ex);
        } catch (DateTimeException | ArithmeticException ex) {
            throw new IllegalStructArgumentException(
                    "seconds", format("Illegal epoch adjustment epoch seconds: %d+%d", epochSecond, nanos), ex);
        }

        return DateTimeValue.datetime(ZonedDateTime.ofInstant(instant, zoneId));
    }
}