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

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using System;
using System.Collections.Generic;
using N2.Persistence.Finder;

namespace N2.Collections
{
        public class ParentFilter : ItemFilter
        {
                ContentItem parent;
                private int? parentID;

                public ParentFilter(int parentID)
                {
                        this.parentID = parentID;
                }

                public ParentFilter(ContentItem parent)
                {
                        if (parent == null)
                                throw new ArgumentNullException("parent");

                        this.parent = parent;
                        this.parentID = parent.ID;
                }

                public override bool Match(ContentItem item)
                {
                        if (parent != null)
                        {
                                return item != parent
                                                && Utility.GetTrail(item).StartsWith(Utility.GetTrail(parent));
                        }

                        while ((item = item.Parent) != null)
                        {
                                if (item.ID == parentID)
                                        return true;
                        }
                        return false;
                }

                #region Static Methods
                public static void Filter(IList<ContentItem> items, ContentItem parent)
                {
                        Filter(items, new ParentFilter(parent));
                }
                public static void Filter(IList<ContentItem> items, int parentID)
                {
                        Filter(items, new ParentFilter(parentID));
                }
                #endregion
        }
}