public class GetDatasourceDependencies : BaseProcessor
{
    public override void Process(GetDependenciesArgs context)
    {
        Func<ItemUri, bool> func = null;
        Assert.IsNotNull(context.IndexedItem, "indexed item");
        Assert.IsNotNull(context.Dependencies, "dependencies");
        Item item = (Item)(context.IndexedItem as SitecoreIndexableItem);

        if (item != null)
        {
            if (func == null)
            {
                func = uri => (bool)((uri != null) && ((bool)(uri != item.Uri)));
            }
            System.Collections.Generic.IEnumerable<ItemUri> source = Enumerable.Where<ItemUri>(from l in Globals.LinkDatabase.GetReferrers(item, FieldIDs.LayoutField) select l.GetSourceItem().Uri, func).Distinct<ItemUri>();
            context.Dependencies.AddRange(source.Select(x => (SitecoreItemUniqueId)x));
        }
    }
}