io.questdb.griffin.engine.functions.conditional.NullIfIFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 QuestDB
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 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  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.conditional;

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.IntFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.IntList;
import io.questdb.std.Numbers;
import io.questdb.std.ObjList;

public class NullIfIFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "nullif(Ii)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        return new NullIfIFunction(args.getQuick(0), args.getQuick(1).getInt(null));
    }

    private static class NullIfIFunction extends IntFunction implements UnaryFunction {
        private final Function value;
        private final int replacement;

        public NullIfIFunction(Function value, int replacement) {
            super();
            this.value = value;
            this.replacement = replacement;
        }

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

        @Override
        public int getInt(Record rec) {
            final int val = value.getInt(rec);
            return val == replacement ? Numbers.INT_NaN : val;
        }
    }
}