EPPlus/FormulaParsing/ExpressionGraph/GroupExpression.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;

namespace OfficeOpenXml.FormulaParsing.ExpressionGraph
{
    public class GroupExpression : Expression
    {
        public GroupExpression(bool isNegated)
            : this(isNegated, new ExpressionCompiler())
        {

        }

        public GroupExpression(bool isNegated, IExpressionCompiler expressionCompiler)
        {
            _expressionCompiler = expressionCompiler;
            _isNegated = isNegated;
        }

        private readonly IExpressionCompiler _expressionCompiler;
        private readonly bool _isNegated;


        public override CompileResult Compile()
        {
            var result =  _expressionCompiler.Compile(Children);
            if (result.IsNumeric && _isNegated)
            {
                return new CompileResult(result.ResultNumeric * -1, result.DataType);
            }
            return result;
        }

        public override bool IsGroupedExpression
        {
            get { return true; }
        }
    }
}