/*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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/*
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* Created on May 15, 2005
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*
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*/
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namespace HH.WMS.Utils.NPOI.SS.Formula.Functions
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{
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using System;
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using HH.WMS.Utils.NPOI.SS.Formula.Eval;
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/**
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* Counts the number of cells that contain numeric data within
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* the list of arguments.
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*
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* Excel Syntax
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* COUNT(value1,value2,...)
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* Value1, value2, ... are 1 to 30 arguments representing the values or ranges to be Counted.
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*
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* TODO: Check this properly Matches excel on edge cases
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* like formula cells, error cells etc
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*/
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public class Count : Function
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{
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private I_MatchPredicate _predicate;
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public Count()
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{
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_predicate = defaultPredicate;
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}
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private Count(I_MatchPredicate criteriaPredicate)
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{
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_predicate = criteriaPredicate;
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}
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public ValueEval Evaluate(ValueEval[] args, int srcCellRow, int srcCellCol)
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{
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int nArgs = args.Length;
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if (nArgs < 1)
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{
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// too few arguments
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return ErrorEval.VALUE_INVALID;
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}
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if (nArgs > 30)
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{
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// too many arguments
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return ErrorEval.VALUE_INVALID;
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}
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int temp = 0;
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for (int i = 0; i < nArgs; i++)
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{
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temp += CountUtils.CountArg(args[i], _predicate);
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}
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return new NumberEval(temp);
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}
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private class DefaultPredicate : I_MatchPredicate
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{
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public bool Matches(ValueEval valueEval)
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{
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if (valueEval is NumberEval)
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{
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// only numbers are counted
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return true;
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}
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if (valueEval == MissingArgEval.instance)
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{
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// oh yeah, and missing arguments
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return true;
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}
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// error values and string values not counted
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return false;
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}
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}
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private static I_MatchPredicate defaultPredicate = new DefaultPredicate();
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private class SubtotalPredicate : I_MatchAreaPredicate
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{
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public bool Matches(ValueEval valueEval)
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{
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return defaultPredicate.Matches(valueEval);
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}
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public bool Matches(TwoDEval x, int rowIndex, int columnIndex)
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{
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return !x.IsSubTotal(rowIndex, columnIndex);
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}
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}
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private static I_MatchPredicate subtotalPredicate = new SubtotalPredicate();
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/**
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* Create an instance of Count to use in {@link Subtotal}
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* <p>
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* If there are other subtotals within argument refs (or nested subtotals),
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* these nested subtotals are ignored to avoid double counting.
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* </p>
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*
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* @see Subtotal
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*/
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public static Count SubtotalInstance()
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{
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return new Count(subtotalPredicate);
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}
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}
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}
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