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/* ====================================================================
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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.formula.functions;

import java.util.regex.Matcher;

import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;

/**
 * Implementation for Excel ImReal() function.

*

* Syntax:
ImReal (Inumber)
*

* Returns the real coefficient of a complex number in x + yi or x + yj text format. *

* Inumber A complex number for which you want the real coefficient. *

* Remarks *

    *
  • If inumber is not in the form x + yi or x + yj, this function returns the #NUM! error value.
  • *
  • Use COMPLEX to convert real and imaginary coefficients into a complex number.
  • *
* * @author cedric dot walter @ gmail dot com */ public class ImReal extends Fixed1ArgFunction implements FreeRefFunction { public static final FreeRefFunction instance = new ImReal(); public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval inumberVE) { ValueEval veText1; try { veText1 = OperandResolver.getSingleValue(inumberVE, srcRowIndex, srcColumnIndex); } catch (EvaluationException e) { return e.getErrorEval(); } String iNumber = OperandResolver.coerceValueToString(veText1); Matcher m = Imaginary.COMPLEX_NUMBER_PATTERN.matcher(iNumber); boolean result = m.matches(); String real = ""; if (result) { String realGroup = m.group(2); boolean hasRealPart = realGroup.length() != 0; if (realGroup.length() == 0) { return new StringEval(String.valueOf(0)); } if (hasRealPart) { String sign = ""; String realSign = m.group(Imaginary.GROUP1_REAL_SIGN); if (realSign.length() != 0 && !(realSign.equals("+"))) { sign = realSign; } String groupRealNumber = m.group(Imaginary.GROUP2_IMAGINARY_INTEGER_OR_DOUBLE); if (groupRealNumber.length() != 0) { real = sign + groupRealNumber; } else { real = sign + "1"; } } } else { return ErrorEval.NUM_ERROR; } return new StringEval(real); } public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { if (args.length != 1) { return ErrorEval.VALUE_INVALID; } return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0]); } }




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