BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/SS/Formula/Udf/AggregatingUDFFinder.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.Udf
{
    using System;
    using Zephyr.Utils.NPOI.SS.Formula.Functions;
    using System.Collections.Generic;

    /**
     * Collects Add-in libraries and VB macro functions toGether into one UDF Finder
     *
     * @author PUdalau
     */
    public class AggregatingUDFFinder : UDFFinder
    {

        private List<UDFFinder> _usedToolPacks = new List<UDFFinder>();

        public AggregatingUDFFinder(params UDFFinder[] usedToolPacks)
        {
            _usedToolPacks = new List<UDFFinder>(usedToolPacks.Length);
            _usedToolPacks.AddRange(usedToolPacks);
        }

        /// <summary>
        /// Returns executor by specified name. 
        /// </summary>
        /// <param name="name">Name of function.</param>
        /// <returns>Function executor. null if not found</returns>
        public override FreeRefFunction FindFunction(String name)
        {
            FreeRefFunction evaluatorForFunction;
            foreach (UDFFinder pack in _usedToolPacks)
            {
                evaluatorForFunction = pack.FindFunction(name);
                if (evaluatorForFunction != null)
                {
                    return evaluatorForFunction;
                }
            }
            return null;
        }

        /// <summary>
        /// Add a new toolpack