EPPlus/FormulaParsing/ExpressionGraph/FunctionCompilers/FunctionCompilerFactory.cs

/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 * 
 * Author							Change						Date
 * ******************************************************************************
 * Mats Alm   		                Added       		        2013-03-01 (Prior file history on https://github.com/swmal/ExcelFormulaParser)
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OfficeOpenXml.FormulaParsing.Excel.Functions;
using OfficeOpenXml.FormulaParsing.Excel.Functions.Logical;

namespace OfficeOpenXml.FormulaParsing.ExpressionGraph.FunctionCompilers
{
    public class FunctionCompilerFactory
    {
        private readonly Dictionary<Type, FunctionCompiler> _specialCompilers = new Dictionary<Type, FunctionCompiler>();

        public FunctionCompilerFactory(FunctionRepository repository)
        {
            _specialCompilers.Add(typeof(If), new IfFunctionCompiler(repository.GetFunction("if")));
            _specialCompilers.Add(typeof(IfError), new IfErrorFunctionCompiler(repository.GetFunction("iferror")));
            _specialCompilers.Add(typeof(IfNa), new IfNaFunctionCompiler(repository.GetFunction("ifna")));
        }

        private FunctionCompiler GetCompilerByType(ExcelFunction function)
        {
            var funcType = function.GetType();
            if (_specialCompilers.ContainsKey(funcType))
            {
                return _specialCompilers[funcType];
            }
            return new DefaultCompiler(function);
        }
        public virtual FunctionCompiler Create(ExcelFunction function)
        {
            if (function.IsLookupFuction) return new LookupFunctionCompiler(function);
            if (function.IsErrorHandlingFunction) return new ErrorHandlingFunctionCompiler(function);
            return GetCompilerByType(function);
        }
    }
}