io.questdb.griffin.engine.functions.cast.CastStrToBooleanFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 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.cast;

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.SqlKeywords;
import io.questdb.griffin.engine.functions.BooleanFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.griffin.engine.functions.constants.BooleanConstant;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

public class CastStrToBooleanFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "cast(St)";
    }

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) throws SqlException {
        Function arg0 = args.getQuick(0);
        if (arg0.isConstant()) {
            return resolveBoolean(arg0.getStr(null)) ? BooleanConstant.TRUE : BooleanConstant.FALSE;
        }
        return new Func(arg0);
    }

    private static boolean resolveBoolean(CharSequence str) {
        return str != null && SqlKeywords.isTrueKeyword(str);
    }

    private static class Func extends BooleanFunction implements UnaryFunction {
        private final Function arg;

        public Func(Function arg) {
            this.arg = arg;
        }

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

        @Override
        public boolean getBool(Record rec) {
            return resolveBoolean(arg.getStr(rec));
        }
    }
}