Page Editor warning for duplicate item names

DuplicateItemNameValidatorWarning.cs

namespace NavArts.Insights.Pipelines.GetPageEditorNotifications
{
    using System;
    using System.Linq;
    using global::Sitecore.ContentSearch.Fluent;
    using global::Sitecore.ContentSearch.Utilities;
    using global::Sitecore.Data;
    using global::Sitecore.Data.Items;
    using global::Sitecore.Diagnostics;
    using global::Sitecore.Pipelines.GetPageEditorNotifications;
    using Search.Results;
    using Sitecore.Extensions;
    using SC = global::Sitecore;

    /// <summary>
    /// Uses an index to query for items with a name match (exact)
    /// </summary>
    public class DuplicateItemNameValidatorWarning : GetPageEditorNotificationsProcessor
    {
        /// <summary>
        /// Template Id to Specify the type of Content Item to Run on and to filter out search results
        /// </summary>
        private readonly ID _templateId;

        /// <summary>
        /// Index Used for searching based on name
        /// </summary>
        private const string IndexName = "sitecore_master_index";

        /// <summary>
        /// Instantiates a new instance of the <see cref="DuplicateItemNameValidatorWarning"/> with a template id
        /// </summary>
        public DuplicateItemNameValidatorWarning(string templateId)
        {
            Assert.IsNotNullOrEmpty(templateId, "templateId cannot be null.");

            this._templateId = ID.Parse(templateId);
        }

        /// <summary>
        /// Query the index for any matching items with the same name
        /// </summary>
        /// <param name="args">Page Editor Args</param>
        public override void Process(GetPageEditorNotificationsArgs args)
        {
            var item = args.ContextItem;

            if (item == null || item.TemplateID != this._templateId)
            {
                return;
            }

            var itemId = item.ID.ToString().NormalizeGuid();

            var results =
                new SearchManager(DuplicateItemNameValidatorWarning.IndexName, DuplicateItemNameValidatorWarning.IndexName).ResultsFor<InsightsResultItem>
                    (search => search
                        .Options(o => o
                            .AddRestriction(this._templateId))
                        .Query(query => query
                            .And(and => and
                                .Where(result => result.Name == item.Name)))
                        .Filter(filter => filter
                            .And(and => and
                                .Where(result => result.RawId != itemId))));

            if (results.Total > 0)
            {
                var description = SC.Globalization.Translate.Text(
                    "If you publish now, the current item may not render properly because the following items have the same name. Click the links below to review these items:");

                var editorNotification = new PageEditorNotification(description, PageEditorNotificationType.Warning);

                results.Results.Select(result => item.Database.GetItem(result.Id)).ForEach(i => DuplicateItemNameValidatorWarning.AddWarningOption(i, editorNotification));

                args.Notifications.Add(editorNotification);
            }
        }

        /// <summary>
        /// Add a warning option to the GetPageEditorNotificationsArgs
        /// </summary>
        /// <param name="dataSourceItem">Item to reference</param>
        /// <param name="pageEditorNotification">Page Editor Notification</param>
        private static void AddWarningOption(Item dataSourceItem, PageEditorNotification pageEditorNotification)
        {
            pageEditorNotification.Options.Add(new PageEditorNotificationOption(dataSourceItem.Name,
                String.Format("webedit:open(id={0},language={1},version={2})",
                    dataSourceItem.ID,
                    dataSourceItem.Language,
                    dataSourceItem.Version.Number)));
        }
    }
}

NavArts.Example.config

<?xml version="1.0"?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>  
    <pipelines>  
          <!-- 
        Page Editor Warnings
        -->
      <getPageEditorNotifications>
        <!-- 
          Adds Page Editor Warnings if an Item has the same Item Name as other Items of the same type
          -->
        <processor type="NavArts.Insights.Pipelines.GetPageEditorNotifications.DuplicateItemNameValidatorWarning, NavArts.Insights">
          <param desc="templateId">{96b9ce40-cd8a-4bd5-a523-028e5ef8632e}</param>
        </processor>
      </getPageEditorNotifications>
    
    </pipelines>
  </sitecore>
</configuration>