BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/SS/Formula/Functions/XYNumericFunction.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 Zephyr.Utils.NPOI.SS.Formula.Eval;
    using Zephyr.Utils.NPOI.SS.Formula;

    public interface Accumulator
    {
        double Accumulate(double x, double y);
    }
    /**
     * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
     *
     */
    public abstract class XYNumericFunction : Fixed2ArgFunction
    {
        protected static int X = 0;
        protected static int Y = 1;

        private abstract class ValueArray : ValueVector
        {
            private int _size;
            protected ValueArray(int size)
            {
                _size = size;
            }
            public ValueEval GetItem(int index)
            {
                if (index < 0 || index > _size)
                {
                    throw new ArgumentException("Specified index " + index
                            + " is outside range (0.." + (_size - 1) + ")");
                }
                return GetItemInternal(index);
            }
            protected abstract ValueEval GetItemInternal(int index);
            public int Size
            {
                get
                {
                    return _size;
                }
            }