Expand string CAML queries via lambda expressions with Camlex.Net

#region Copyright(c) Alexey Sadomov, Vladimir Timashkov. All Rights Reserved.
// -----------------------------------------------------------------------------
// Copyright(c) 2010 Alexey Sadomov, Vladimir Timashkov. All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   1. No Trademark License - Microsoft Public License (Ms-PL) does not grant you rights to use
//      authors names, logos, or trademarks.
//   2. If you distribute any portion of the software, you must retain all copyright,
//      patent, trademark, and attribution notices that are present in the software.
//   3. If you distribute any portion of the software in source code form, you may do
//      so only under this license by including a complete copy of Microsoft Public License (Ms-PL)
//      with your distribution. If you distribute any portion of the software in compiled
//      or object code form, you may only do so under a license that complies with
//      Microsoft Public License (Ms-PL).
//   4. The names of the authors may not be used to endorse or promote products
//      derived from this software without specific prior written permission.
//
// The software is licensed "as-is." You bear the risk of using it. The authors
// give no express warranties, guarantees or conditions. You may have additional consumer
// rights under your local laws which this license cannot change. To the extent permitted
// under your local laws, the authors exclude the implied warranties of merchantability,
// fitness for a particular purpose and non-infringement.
// -----------------------------------------------------------------------------
#endregion

using System;
using System.Xml.Linq;
using CamlexNET.Interfaces;
using CamlexNET.Interfaces.ReverseEngeneering;

namespace CamlexNET.Impl.ReverseEngeneering
{
    internal abstract class ReBaseAnalyzer : IReAnalyzer
    {
        protected XElement el;
        protected IReOperandBuilder operandBuilder;

        public ReBaseAnalyzer(XElement el, IReOperandBuilder operandBuilder)
        {
            this.el = el;
            this.operandBuilder = operandBuilder;
        }

        public XElement Element
        {
            get { return this.el; }
        }

        public virtual bool IsValid()
        {
            return (this.el != null);
        }
        public abstract IOperation GetOperation();

        protected bool isOperationComparison(XElement operationElement)
        {
            var operationName = operationElement.Name.LocalName;
            return (string.Compare(operationName, Tags.Geq, true) == 0 || string.Compare(operationName, Tags.Gt, true) == 0 ||
                    string.Compare(operationName, Tags.Lt, true) == 0 || string.Compare(operationName, Tags.Leq, true) == 0);
        }
    }
}