C:/Private/OSS/n2cms/github/n2cms/src/Framework/Extensions/Extensions/FilterExtensions.cs

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using N2.Collections;
using System.Security.Principal;
using N2.Security;

namespace N2.Extensions
{
        public static class FilterExtensions
        {
                public static T FilterByAccess<T>(this T item) where T: ContentItem
                {
                        return item.FilterWith(new AccessFilter());
                }

                public static T FilterByAccess<T>(this T item, IPrincipal user) where T : ContentItem
                {
                        return item.FilterWith(new AccessFilter(user, AccessFilter.CurrentSecurityManager()));
                }

                public static T FilterByNavigation<T>(this T item) where T : ContentItem
                {
                        return item.FilterWith(new NavigationFilter());
                }

                private static T FilterWith<T>(this T item, ItemFilter filter) where T: ContentItem
                {
                        if (item == null)
                                return null;

                        if (filter.Match(item))
                                return item;

                        return null;
                }
        }
}