io.questdb.griffin.engine.functions.cast.CastStrToTimestampFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
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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.functions.cast;

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.SqlExecutionContext;
import io.questdb.griffin.engine.functions.AbstractUnaryTimestampFunction;
import io.questdb.std.Numbers;
import io.questdb.std.NumericException;
import io.questdb.std.ObjList;
import io.questdb.std.datetime.microtime.TimestampFormatUtils;

public class CastStrToTimestampFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "cast(Sn)";
    }

    @Override
    public Function newInstance(ObjList args, int position, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) {
        return new Func(position, args.getQuick(0));
    }

    private static class Func extends AbstractUnaryTimestampFunction {
        public Func(int position, Function arg) {
            super(position, arg);
        }

        @Override
        public long getTimestamp(Record rec) {
            final CharSequence value = arg.getStr(rec);
            try {
                return value == null ? Numbers.LONG_NaN : TimestampFormatUtils.parseUTCTimestamp(value);
            } catch (NumericException e) {
                return Numbers.LONG_NaN;
            }
        }
    }
}