LocaleAwarePhraseCriterion.cs

using EPiServer.Find.Framework.BestBets;
using EPiServer.Globalization;
using System;
using System.Globalization;
using System.Linq;

namespace BestBetExtension.Business.CustomPhraseCriterion
{
    public class LocaleAwarePhraseCriterion : DefaultPhraseCriterion, IPhraseCriterion
    {
        private const string localeIdenifier = "#";
        public override bool Match(string searchPhrase)
        {
            if (string.IsNullOrWhiteSpace(searchPhrase) || (Phrase == null))
            {
                return false;
            }

            if (Phrase.Contains(localeIdenifier))
            {
                // Get current Episerver locale
                CultureInfo currentCulture = ContentLanguage.PreferredCulture;
                string languageBranch = currentCulture.Name;

                // Get matches for the current culture
                string[] bestBetPhrases = ParsePhrasesForLocale(Phrase, languageBranch);
                string[] searchPhrases = ParsePhrases(searchPhrase);

                return bestBetPhrases.Any<string>(p => searchPhrases.Contains<string>(p, StringComparer.OrdinalIgnoreCase));

            }
            return base.Match(searchPhrase);
        }

        internal static string[] ParsePhrases(string value)
        {
            if (!string.IsNullOrWhiteSpace(value))
            {
                string[] separator = new string[] { "," };
                return (from e in value.Split(separator, StringSplitOptions.RemoveEmptyEntries)
                        where !string.IsNullOrWhiteSpace(e)
                        select e.Trim()).ToArray<string>();
            }
            return new string[0];
        }

        internal static string[] ParsePhrasesForLocale(string value, string locale)
        {
            string localeHash = localeIdenifier + locale;
            // Parse out locales that do not match
            var phrases = ParsePhrases(value);
            if (phrases.Length > 0)
            {
                return (from e in phrases
                        where e.EndsWith(localeIdenifier + locale, StringComparison.OrdinalIgnoreCase)
                        select e.Trim().Replace(localeHash, string.Empty).Trim()).ToArray();
            }
            return phrases;
        }
    }
}