BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/SS/Formula/EvaluationCache.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
{

    using System;

    using Zephyr.Utils.NPOI.SS.Formula.Eval;
    

    /**
     * Performance optimisation for {@link HSSFFormulaEvaluator}. This class stores previously
     * calculated values of already visited cells, To avoid unnecessary re-calculation when the 
     * same cells are referenced multiple times
     * 
     * 
     * @author Josh Micich
     */
    public class EvaluationCache
    {

        private PlainCellCache _plainCellCache;
        private FormulaCellCache _formulaCellCache;
        /** only used for testing. <c>null</c> otherwise */
        IEvaluationListener _evaluationListener;

        /* package */
        public EvaluationCache(IEvaluationListener evaluationListener)
        {
            _evaluationListener = evaluationListener;
            _plainCellCache = new PlainCellCache();
            _formulaCellCache = new FormulaCellCache();
        }

        public void NotifyUpdateCell(int bookIndex, int sheetIndex, IEvaluationCell cell)
        {
            FormulaCellCacheEntry fcce = _formulaCellCache.Get(cell);

            int rowIndex = cell.RowIndex;
            int columnIndex = cell.ColumnIndex;
            Loc loc = new Loc(bookIndex, sheetIndex, cell.RowIndex, cell.ColumnIndex);
            PlainValueCellCacheEntry pcce = _plainCellCache.Get(loc);

            if (cell.CellType == Zephyr.Utils.NPOI.SS.UserModel.CellType.FORMULA)
            {