io.questdb.griffin.engine.functions.date.ToTimezoneTimestampFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 QuestDB
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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions.date;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BinaryFunction;
import io.questdb.griffin.engine.functions.TimestampFunction;
import io.questdb.std.IntList;
import io.questdb.std.NumericException;
import io.questdb.std.ObjList;
import io.questdb.std.datetime.microtime.TimestampFormatUtils;
import io.questdb.std.datetime.microtime.Timestamps;

import static io.questdb.griffin.engine.functions.date.ToUTCTimestampFunctionFactory.getTimestampFunction;

public class ToTimezoneTimestampFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "to_timezone(NS)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) throws SqlException {
        Function timestamp = args.getQuick(0);
        Function timezone = args.getQuick(1);

        if (timezone.isConstant()) {
            return getTimestampFunction(argPositions, timestamp, timezone, 1);
        } else {
            return new ToTimezoneFunctionVar(timestamp, timezone);
        }
    }

    private static class ToTimezoneFunctionVar extends TimestampFunction implements BinaryFunction {
        private final Function timestamp;
        private final Function timezone;

        public ToTimezoneFunctionVar(Function timestamp, Function timezone) {
            this.timestamp = timestamp;
            this.timezone = timezone;
        }

        @Override
        public Function getLeft() {
            return timestamp;
        }

        @Override
        public Function getRight() {
            return timezone;
        }

        @Override
        public long getTimestamp(Record rec) {
            final long timestampValue = timestamp.getTimestamp(rec);
            try {
                final CharSequence tz = timezone.getStr(rec);
                return tz != null ? Timestamps.toTimezone(timestampValue, TimestampFormatUtils.enLocale, tz) : timestampValue;
            } catch (NumericException e) {
                return timestampValue;
            }
        }
    }
}