io.questdb.griffin.engine.functions.regex.NotMatchStrFunctionFactory 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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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.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BooleanFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.Chars;
import io.questdb.std.ObjList;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class NotMatchStrFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "!~(Ss)";
    }

    @Override
    public Function newInstance(ObjList args, int position, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) throws SqlException {
        Function value = args.getQuick(0);
        CharSequence regex = args.getQuick(1).getStr(null);

        if (regex == null) {
            throw SqlException.$(args.getQuick(1).getPosition(), "NULL regex");
        }

        try {
            Matcher matcher = Pattern.compile(Chars.toString(regex)).matcher("");
            return new MatchFunction(position, value, matcher);
        } catch (PatternSyntaxException e) {
            throw SqlException.$(args.getQuick(1).getPosition() + e.getIndex() + 1, e.getMessage());
        }
    }

    private static class MatchFunction extends BooleanFunction implements UnaryFunction {
        private final Function arg;
        private final Matcher matcher;

        public MatchFunction(int position, Function arg, Matcher matcher) {
            super(position);
            this.arg = arg;
            this.matcher = matcher;
        }

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

        @Override
        public boolean getBool(Record rec) {
            CharSequence cs = getArg().getStr(rec);
            return cs == null || !matcher.reset(cs).find();
        }
    }
}