io.questdb.griffin.engine.functions.regex.LikeCharFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 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
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.regex;


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.BooleanFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.ObjList;

public class LikeCharFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "like(Sa)";
    }

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

    private static class MatchFunction extends BooleanFunction implements UnaryFunction {
        private final Function value;
        private final char expected;

        public MatchFunction(int position, Function value, char expected) {
            super(position);
            this.value = value;
            this.expected = expected;
        }

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

        @Override
        public boolean getBool(Record rec) {
            CharSequence cs = getArg().getStr(rec);
            return cs != null && cs.length() == 1 && cs.charAt(0) == expected;
        }
    }
}