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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
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   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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package org.apache.poi.ss.formula.functions;

import org.apache.poi.ss.formula.ThreeDEval;
import org.apache.poi.ss.formula.eval.*;
import org.apache.poi.ss.formula.functions.CountUtils.I_MatchPredicate;

/**
 * Implementation for the function COUNTBLANK
 * 

* Syntax: COUNTBLANK ( range ) *

* *
range   is the range of cells to count blanks
*

* * @author Mads Mohr Christensen */ public final class Countblank extends Fixed1ArgFunction { public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0) { double result; if (arg0 instanceof RefEval) { result = CountUtils.countMatchingCellsInRef((RefEval) arg0, predicate); } else if (arg0 instanceof ThreeDEval) { result = CountUtils.countMatchingCellsInArea((ThreeDEval) arg0, predicate); } else { throw new IllegalArgumentException("Bad range arg type (" + arg0.getClass().getName() + ")"); } return new NumberEval(result); } private static final I_MatchPredicate predicate = new I_MatchPredicate() { public boolean matches(ValueEval valueEval) { // Note - only BlankEval counts return valueEval == BlankEval.instance || // see https://support.office.com/en-us/article/COUNTBLANK-function-6a92d772-675c-4bee-b346-24af6bd3ac22 // "Cells with formulas that return "" (empty text) are also counted." (valueEval instanceof StringEval && ((StringEval)valueEval).getStringValue().isEmpty()); } }; }




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