using System;

using System.Collections.Generic;

namespace SmartStore.Core

{

/// <summary>

/// This class is used to compare any

/// type(property) of a class for sorting.

/// This class automatically fetches the

/// type of the property and compares.

/// </summary>

public sealed partial class GenericComparer<T> : IComparer<T>

{

#region Enums

/// <summary>

/// The sort order direction for sorting the collection

/// </summary>

public enum SortOrder

{

/// <summary>

/// Ascending

/// </summary>

Ascending,

/// <summary>

/// Descending

/// </summary>

Descending

};

#endregion

#region Ctor

/// <summary>

/// Creates a new instance of the GenericComparer class

/// </summary>

/// <param name="sortColumn">The property on which the collection should be sorted</param>

/// <param name="sortingOrder">The direction of the sort</param>

public GenericComparer(string sortColumn, SortOrder sortingOrder)

{

this._sortColumn = sortColumn;

this._sortingOrder = sortingOrder;

}

#endregion

#region Fields

private readonly string _sortColumn;

private readonly SortOrder _sortingOrder;

#endregion

#region Properties

/// <summary>

/// Column Name(public property of the class) to be sorted.

/// </summary>

public string SortColumn

{

get { return _sortColumn; }

}

/// <summary>

/// Sorting order.

/// </summary>

public SortOrder SortingOrder

{

get { return _sortingOrder; }

}

#endregion

#region Methods

/// <summary>

/// Compare interface implementation

/// </summary>

/// <param name="x">custom Object</param>

/// <param name="y">custom Object</param>

/// <returns>int</returns>

public int Compare(T x, T y)

{

var propertyInfo = typeof(T).GetProperty(_sortColumn);

var obj1 = (IComparable)propertyInfo.GetValue(x, null);

var obj2 = (IComparable)propertyInfo.GetValue(y, null);

if (_sortingOrder == SortOrder.Ascending)

{

return (obj1.CompareTo(obj2));

}

else

{

return (obj2.CompareTo(obj1));

}

}

#endregion

}

}