io.questdb.griffin.engine.functions.math.SubIntFunctionFactory 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.math;

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

public class SubIntFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "-(II)";
    }

    @Override
    public Function newInstance(ObjList args, int position, CairoConfiguration configuration1, SqlExecutionContext sqlExecutionContext) {
        return new SubtractIntVVFunc(position, args.getQuick(0), args.getQuick(1));
    }

    private static class SubtractIntVVFunc extends IntFunction implements BinaryFunction {
        final Function left;
        final Function right;

        public SubtractIntVVFunc(int position, Function left, Function right) {
            super(position);
            this.left = left;
            this.right = right;
        }

        @Override
        public int getInt(Record rec) {
            int l = left.getInt(rec);
            int r = right.getInt(rec);

            if (l != Numbers.INT_NaN && r != Numbers.INT_NaN) {
                return l - r;
            }

            return Numbers.INT_NaN;
        }

        @Override
        public Function getLeft() {
            return left;
        }

        @Override
        public Function getRight() {
            return right;
        }
    }
}