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

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
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 *  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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 *  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.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.SqlExecutionContext;
import io.questdb.griffin.engine.functions.ByteFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.Numbers;
import io.questdb.std.ObjList;

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

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

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

        public Func(int position, Function arg) {
            super(position);
            this.arg = arg;
        }

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

        @Override
        public byte getByte(Record rec) {
            final long value = arg.getDate(rec);
            return value != Numbers.LONG_NaN ? (byte) value : 0;
        }
    }
}