/*
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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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namespace HH.WMS.Utils.NPOI.SS.Formula.Eval
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{
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using System;
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using HH.WMS.Utils.NPOI.SS.Formula;
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using HH.WMS.Utils.NPOI.SS.Formula.Functions;
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/**
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* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
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*
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*/
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public class UnaryMinusEval : Fixed1ArgFunction
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{
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public static Function instance = new UnaryMinusEval();
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private UnaryMinusEval()
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{
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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 d;
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try
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{
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ValueEval ve = OperandResolver.GetSingleValue(arg0, srcRowIndex, srcColumnIndex);
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d = OperandResolver.CoerceValueToDouble(ve);
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}
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catch (EvaluationException e)
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{
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return e.GetErrorEval();
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}
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if (d == 0.0)
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{ // this '==' matches +0.0 and -0.0
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return NumberEval.ZERO;
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}
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return new NumberEval(-d);
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}
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}
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}
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