main/src/main/java/org/apache/poi/ss/formula/functions/Errortype.java

/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   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
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       http://www.apache.org/licenses/LICENSE-2.0

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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.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.usermodel.FormulaError;

/**
 * Implementation for the ERROR.TYPE() Excel function.
 * <p>
 * <b>Syntax:</b><br>
 * <b>ERROR.TYPE</b>(<b>errorValue</b>)</p>
 * <p>
 * Returns a number corresponding to the error type of the supplied argument.<p>
 * <p>
 *    <table border="1" cellpadding="1" cellspacing="1" summary="Return values for ERROR.TYPE()">
 *      <tr><td>errorValue</td><td>Return Value</td></tr>
 *      <tr><td>#NULL!</td><td>1</td></tr>
 *      <tr><td>#DIV/0!</td><td>2</td></tr>
 *      <tr><td>#VALUE!</td><td>3</td></tr>
 *      <tr><td>#REF!</td><td>4</td></tr>
 *      <tr><td>#NAME?</td><td>5</td></tr>
 *      <tr><td>#NUM!</td><td>6</td></tr>
 *      <tr><td>#N/A!</td><td>7</td></tr>
 *      <tr><td>everything else</td><td>#N/A!</td></tr>
 *    </table>
 *
 * Note - the results of ERROR.TYPE() are different to the constants defined in
 * <tt>ErrorConstants</tt>.
 * </p>
 *
 * @author Josh Micich
 */
public final class Errortype extends Fixed1ArgFunction {

	public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0) {

		try {
			OperandResolver.getSingleValue(arg0, srcRowIndex, srcColumnIndex);
			return ErrorEval.NA;
		} catch (EvaluationException e) {
			int result = translateErrorCodeToErrorTypeValue(e.getErrorEval().getErrorCode());
			return new NumberEval(result);
		}
	}

	private int translateErrorCodeToErrorTypeValue(int errorCode) {
		switch (FormulaError.forInt(errorCode)) {
			case NULL:  return 1;
			case DIV0:  return 2;
			case VALUE: return 3;
			case REF:   return 4;
			case NAME:  return 5;
			case NUM:   return 6;
			case NA:    return 7;
			default:
		        throw new IllegalArgumentException("Invalid error code (" + errorCode + ")");
		}
	}

}