io.questdb.griffin.engine.functions.date.ToPgDateFunctionFactory 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.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.DateFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.Numbers;
import io.questdb.std.NumericException;
import io.questdb.std.ObjList;
import io.questdb.std.datetime.millitime.DateFormatUtils;

public class ToPgDateFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "to_pg_date(S)";
    }

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

    public static final class ToPgDateFunction extends DateFunction implements UnaryFunction {

        private final Function arg;

        public ToPgDateFunction(int position, Function arg) {
            super(position);
            this.arg = arg;
        }

        @Override
        public Function getArg() {
            return arg;
        }

        @Override
        public long getDate(Record rec) {
            CharSequence value = arg.getStr(rec);
            try {
                if (value != null) {
                    return DateFormatUtils.PG_DATE_FORMAT.parse(value, DateFormatUtils.enLocale);
                }
            } catch (NumericException ignore) {
            }
            return Numbers.LONG_NaN;
        }
    }
}