io.questdb.griffin.engine.functions.lt.LtCharFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 QuestDB
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 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  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.lt;

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.NegatableBooleanFunction;
import io.questdb.griffin.engine.functions.constants.CharConstant;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

public class LtCharFunctionFactory implements FunctionFactory {

    private static final char CHAR_NULL = CharConstant.ZERO.getChar(null);

    @Override
    public String getSignature() {
        return "<(AA)";
    }

    @Override
    public boolean isBoolean() {
        return true;
    }

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

    private static class LtCharFunction extends NegatableBooleanFunction implements BinaryFunction {

        private final Function left;
        private final Function right;

        public LtCharFunction(Function left, Function right) {
            this.left = left;
            this.right = right;
        }

        @Override
        public boolean getBool(Record rec) {
            char left = this.left.getChar(rec);
            char right = this.right.getChar(rec);

            if (left == CHAR_NULL || right == CHAR_NULL) {
                return false;
            }
            return negated == (left >= right);
        }

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

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