BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/SS/Formula/Functions/MultiOperandNumericFunction.cs

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/*
* Licensed to the Apache Software Foundation (ASF) Under one or more
* contributor license agreements.  See the NOTICE file distributed with
* 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
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed Under the License is distributed on an "AS Is" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations Under the License.
*/

namespace Zephyr.Utils.NPOI.SS.Formula.Functions
{
    using System;
    using System.Collections.Generic;
    using Zephyr.Utils.NPOI.SS.Formula.Eval;
    using Zephyr.Utils.NPOI.SS.Formula;

    /**
     * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
     * This Is the base class for all excel function evaluator
     * classes that take variable number of operands, and
     * where the order of operands does not matter
     */
    public abstract class MultiOperandNumericFunction : Function
    {
        static double[] EMPTY_DOUBLE_ARRAY = { };
        private bool _isReferenceBoolCounted;
        private bool _isBlankCounted;

        protected MultiOperandNumericFunction(bool isReferenceBoolCounted, bool isBlankCounted)
        {
            _isReferenceBoolCounted = isReferenceBoolCounted;
            _isBlankCounted = isBlankCounted;
        }
        protected internal abstract double Evaluate(double[] values);

        public ValueEval Evaluate(ValueEval[] args, int srcCellRow, int srcCellCol)
        {

            double d;
            try
            {
                double[] values = GetNumberArray(args);
                d = Evaluate(values);
            }
            catch (EvaluationException e)
            {
                return e.GetErrorEval();
            }

            if (Double.IsNaN(d) || Double.IsInfinity(d))
                return ErrorEval.NUM_ERROR;