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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
 *
 *  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.str;

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

public class LengthSymbolFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "length(K)";
    }

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

    private static class LengthSymbolVFunc extends IntFunction implements UnaryFunction {
        private final Function arg;

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

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

        @Override
        public int getInt(Record rec) {
            CharSequence symbol = arg.getSymbol(rec);
            return symbol == null ? -1 : symbol.length();
        }
    }
}