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   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.ss.formula.functions;

import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.ValueEval;

/**
 * <p>Implementation for Excel Oct2Dec() function.<p/>
 * <p>
 * Converts an octal number to decimal.
 * </p>
 * <p>
 * <b>Syntax</b>:<br/> <b>Oct2Dec  </b>(<b>number</b> )
 * </p>
 * <p/>
 * Number     is the octal number you want to convert. Number may not contain more than 10 octal characters (30 bits).
 * The most significant bit of number is the sign bit. The remaining 29 bits are magnitude bits.
 * Negative numbers are represented using two's-complement notation..
 * <p/>
 * If number is not a valid octal number, OCT2DEC returns the #NUM! error value.
 *
 * @author cedric dot walter @ gmail dot com
 */
public class Oct2Dec extends Fixed1ArgFunction implements FreeRefFunction {

    public static final FreeRefFunction instance = new Oct2Dec();

    static final int MAX_NUMBER_OF_PLACES = 10;
    static final int OCTAL_BASE = 8;

    public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval numberVE) {
        String octal = OperandResolver.coerceValueToString(numberVE);
        try {
           return new NumberEval(BaseNumberUtils.convertToDecimal(octal, OCTAL_BASE, MAX_NUMBER_OF_PLACES));
        }  catch (IllegalArgumentException e) {
            return ErrorEval.NUM_ERROR;
        }
    }

    public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
        if (args.length != 1) {
            return ErrorEval.VALUE_INVALID;
        }
        return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0]);
    }
}