io.questdb.griffin.engine.functions.cast.CastIPv4ToStrFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2019-2023 QuestDB
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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;
import org.jetbrains.annotations.Nullable;

import static io.questdb.std.Numbers.IPv4_NULL;

public class CastIPv4ToStrFunctionFactory implements FunctionFactory {

    @Override
    public String getSignature() {
        return "cast(Xs)";
    }

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) {
        Function IPv4Func = args.getQuick(0);
        if (IPv4Func.isConstant()) {
            StringSink sink = Misc.getThreadLocalBuilder();
            Numbers.intToIPv4Sink(sink, IPv4Func.getIPv4(null));
            return new StrConstant(Chars.toString(sink));
        }
        return new CastIPv4ToStrFunctionFactory.CastIPv4ToStrFunction(args.getQuick(0));
    }

    public static class CastIPv4ToStrFunction extends AbstractCastToStrFunction {
        private final StringSink sinkA = new StringSink();
        private final StringSink sinkB = new StringSink();

        public CastIPv4ToStrFunction(Function arg) {
            super(arg);
        }

        @Override
        public CharSequence getStr(Record rec) {
            final int value = arg.getIPv4(rec);
            return toSink(value, sinkA);
        }

        @Override
        public void getStr(Record rec, CharSink sink) {
            final int value = arg.getIPv4(rec);
            if (value != IPv4_NULL) {
                Numbers.intToIPv4Sink(sink, value);
            }
        }

        @Override
        public CharSequence getStrB(Record rec) {
            final int value = arg.getIPv4(rec);
            return toSink(value, sinkB);
        }

        @Nullable
        private StringSink toSink(int value, StringSink sinkB) {
            if (value != IPv4_NULL) {
                sinkB.clear();
                Numbers.intToIPv4Sink(sinkB, value);
                return sinkB;
            }
            return null;
        }
    }
}