C:/Private/OSS/n2cms/github/n2cms/src/Framework/N2/Collections/ItemComparer.generic.cs

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#region License
/* Copyright (C) Cristian Libardo
 *
 * This 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 software 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site:.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Text;

namespace N2.Collections
{
        public class ItemComparer<T> : IComparer<T> where T: ContentItem
        {
                #region Constructors

                public ItemComparer()
                        : this("SortOrder")
                {
                }

                public ItemComparer(string sortExpression)
                {
                        string[] pair = sortExpression.Split(' ');
                        this.detailToCompare = pair[0];
                        if (pair.Length > 1 && string.Compare(pair[1], "DESC", true) == 0)
                                inverse = true;
                }

                public ItemComparer(string detailToCompare, bool inverse)
                {
                        this.detailToCompare = detailToCompare;
                        this.inverse = inverse;
                }
                #endregion

                #region Static Methods






                public static int Compare(T x, T y, string detailToCompare, bool inverse)
                {
                        object ox = x[detailToCompare];
                        object oy = y[detailToCompare];
                        if (inverse)
                                return System.Collections.Comparer.Default.Compare(oy, ox);
                        else
                                return System.Collections.Comparer.Default.Compare(ox, oy);
                }
                #endregion

                #region IComparer & IComparer<T> Members

                public int Compare(object x, object y)
                {
                        if (x is T && y is T)
                                return Compare((T)x, (T)y);
                        return 0;
                }

                public int Compare(T x, T y)
                {
                        return Compare(x, y, DetailToCompare, Inverse);
                }

                private string detailToCompare = "SortOrder";
                public string DetailToCompare
                {
                        get { return detailToCompare; }
                        set { detailToCompare = value; }
                }

                bool inverse = false;
                public bool Inverse
                {
                        get { return inverse; }
                        set { inverse = value; }
                }
                #endregion

        }
}