/* ====================================================================
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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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namespace HH.WMS.Utils.NPOI.SS.Formula.Atp
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{
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using HH.WMS.Utils.NPOI.SS.Formula.Functions;
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using HH.WMS.Utils.NPOI.SS.Formula.Eval;
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using System;
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/**
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* Implementation of Excel 'Analysis ToolPak' function RANDBETWEEN()<br/>
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*
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* Returns a random integer number between the numbers you specify.<p/>
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*
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* <b>Syntax</b><br/>
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* <b>RANDBETWEEN</b>(<b>bottom</b>, <b>top</b>)<p/>
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*
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* <b>bottom</b> is the smallest integer RANDBETWEEN will return.<br/>
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* <b>top</b> is the largest integer RANDBETWEEN will return.<br/>
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* @author Brendan Nolan
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*/
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class RandBetween : FreeRefFunction
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{
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public static FreeRefFunction Instance = new RandBetween();
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private RandBetween()
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{
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//enforces singleton
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}
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/**
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* Evaluate for RANDBETWEEN(). Must be given two arguments. Bottom must be greater than top.
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* Bottom is rounded up and top value is rounded down. After rounding top has to be set greater
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* than top.
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*
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* @see org.apache.poi.ss.formula.functions.FreeRefFunction#evaluate(org.apache.poi.ss.formula.eval.ValueEval[], org.apache.poi.ss.formula.OperationEvaluationContext)
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*/
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public ValueEval Evaluate(ValueEval[] args, OperationEvaluationContext ec)
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{
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double bottom, top;
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if (args.Length != 2)
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{
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return ErrorEval.VALUE_INVALID;
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}
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try
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{
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bottom = OperandResolver.CoerceValueToDouble(OperandResolver.GetSingleValue(args[0], ec.RowIndex, ec.ColumnIndex));
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top = OperandResolver.CoerceValueToDouble(OperandResolver.GetSingleValue(args[1], ec.RowIndex, ec.ColumnIndex));
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if (bottom > top)
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{
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return ErrorEval.NUM_ERROR;
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}
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}
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catch (EvaluationException)
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{
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return ErrorEval.VALUE_INVALID;
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}
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bottom = Math.Ceiling(bottom);
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top = Math.Floor(top);
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if (bottom > top)
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{
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top = bottom;
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}
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Random rnd = new Random();
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return new NumberEval((bottom + (int)(rnd.NextDouble() * ((top - bottom) + 1))));
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}
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}
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}
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