Sitecore Page Events to add Search Terms to Analytics

PageEvents.cs

using Sitecore.Analytics;
using Sitecore.Analytics.Data;
using Sitecore.Analytics.Tracking;
using Sitecore.Data;

namespace BlackTambourine.Core.Sitecore.Helpers
{
    public class PageEvents
    {
        public static ID PageEventSearchId { get { return new ID("{0C179613-2073-41AB-992E-027D03D523BF}"); } }
        public static ID PageEventDownloadId { get { return new ID("{FA72E131-3CFD-481C-8E15-04496E9586DC}"); } }

        /// <summary>
        /// Register a Search Keyword in Sitecore Experience Analytics (Behaviour > Internal Search)
        /// </summary>
        /// <param name="searchterm"></param>
        /// <param name="itemId"></param>
        public void RegisterSearchTerm(string searchterm, ID itemId)
        {
            if (searchterm == null)
            {
                return;
            }
            if (!TrackerEnabled())
            {
                return;
            }

            var page = CurrentPage();
            page.Register(new PageEventData("Search", PageEventSearchId.Guid)
            {
                ItemId = itemId.ToGuid(),
                Data = searchterm,
                DataKey = searchterm,
                Text = searchterm
            });
        }

        /// <summary>
        /// Register a Media Library item download in Sitecore Experience Analytics (Behaviour > Assets > Downloads)
        /// </summary>
        /// <param name="downloadedResourceText"></param>
        /// <param name="itemId"></param>
        public void RegisterDownload(string downloadedResourceText, ID itemId)
        {
            if (downloadedResourceText == null)
            {
                return;
            }

            if (!TrackerEnabled())
            {
                return;
            }

            var page = CurrentPage();
            page.Register(new PageEventData("Download", PageEventDownloadId.Guid)
            {
                ItemId = itemId.ToGuid(),
                Data = downloadedResourceText,
                DataKey = downloadedResourceText,
                Text = "Resource Downloaded"
            });
        }

        /// <summary>
        /// Register a Page Event
        /// </summary>
        /// <param name="pageEventId"></param>
        /// <param name="pageEventName"></param>
        /// <param name="itemId"></param>
        /// <param name="text"></param>
        /// <param name="data"></param>
        public void RegisterPageEvent(ID pageEventId, string pageEventName, ID itemId, string text, string data)
        {
            if (pageEventId.IsNull)
            {
                return;
            }
            if (!TrackerEnabled())
            {
                return;
            }

            var page = CurrentPage();
            page.Register(new PageEventData(pageEventName, pageEventId.Guid)
            {
                ItemId = itemId.ToGuid(),
                Data = data,
                DataKey = data,
                Text = text
            });
        }

        private ICurrentPageContext CurrentPage()
        {
            return Tracker.Current.Session.Interaction.CurrentPage;
        }

        private static bool TrackerEnabled()
        {
            return Tracker.IsActive && Tracker.Current.Session != null && Tracker.Current.Session.Interaction != null;
        }
    }
}