/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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using HH.WMS.Utils.NPOI.SS.Formula.Eval;
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using System;
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namespace HH.WMS.Utils.NPOI.SS.Formula.Functions
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{
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/**
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* Implementation for the function COUNTBLANK
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* <p>
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* Syntax: COUNTBLANK ( range )
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* <table border="0" cellpadding="1" cellspacing="0" summary="Parameter descriptions">
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* <tr><th>range </th><td>is the range of cells to count blanks</td></tr>
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* </table>
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* </p>
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*
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* @author Mads Mohr Christensen
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*/
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public class Countblank : Fixed1ArgFunction
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{
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public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0)
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{
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double result;
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if (arg0 is RefEval)
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{
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result = CountUtils.CountMatchingCell((RefEval)arg0, predicate);
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}
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else if (arg0 is TwoDEval)
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{
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result = CountUtils.CountMatchingCellsInArea((TwoDEval)arg0, predicate);
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}
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else
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{
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throw new ArgumentException("Bad range arg type (" + arg0.GetType().Name + ")");
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}
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return new NumberEval(result);
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}
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private static I_MatchPredicate predicate = new BlankPredicate();
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private class BlankPredicate : I_MatchPredicate
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{
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#region I_MatchPredicate 成员
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public bool Matches(ValueEval valueEval)
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{
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return valueEval == BlankEval.instance;
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}
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#endregion
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}
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}
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}
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