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

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2023 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.constants.StrConstant;
import io.questdb.std.*;
import io.questdb.std.str.CharSink;
import io.questdb.std.str.StringSink;

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

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) {
        Function func = args.getQuick(0);
        if (func.isConstant()) {
            StringSink sink = Misc.getThreadLocalBuilder();
            sink.put(func.getDate(null));
            return new StrConstant(Chars.toString(sink));
        }
        return new CastDateToStrFunction(args.getQuick(0));
    }

    public static class CastDateToStrFunction extends AbstractCastToStrFunction {
        private final StringSink sinkA = new StringSink();
        private final StringSink sinkB = new StringSink();

        public CastDateToStrFunction(Function arg) {
            super(arg);
        }

        @Override
        public CharSequence getStr(Record rec) {
            final long value = arg.getDate(rec);
            if (value == Numbers.LONG_NaN) {
                return null;
            }
            sinkA.clear();
            sinkA.putISODateMillis(value);
            return sinkA;
        }

        @Override
        public void getStr(Record rec, CharSink sink) {
            final long value = arg.getDate(rec);
            if (value == Numbers.LONG_NaN) {
                return;
            }

            sink.putISODateMillis(value);
        }

        @Override
        public CharSequence getStrB(Record rec) {
            final long value = arg.getDate(rec);
            if (value == Numbers.LONG_NaN) {
                return null;
            }
            sinkB.clear();
            sinkB.putISODateMillis(value);
            return sinkB;
        }
    }
}