LuceneProviderExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Lucene.Net.Search;
using Sitecore.ContentSearch;
using Sitecore.ContentSearch.Linq;
using Sitecore.ContentSearch.Linq.Common;
using Sitecore.ContentSearch.Linq.Lucene;
using Sitecore.ContentSearch.Linq.Methods;
using Sitecore.ContentSearch.Linq.Parsing;
using Sitecore.ContentSearch.LuceneProvider;

namespace Sitecore.ContentSearch.LuceneProvider.Extensions
{
    public static class LuceneProviderExtensions
    {
        public static SearchResults<T> GetResults<T>(this IQueryable<T> queryable, IProviderSearchContext context, Func<Query, Query> searchBehaviour)
        {
            var extendedQuery = (LuceneQuery)((IHasNativeQuery)queryable).Query;

            var methods = new List<QueryMethod> { new GetResultsMethod(GetResultsOptions.Default) };
            methods.AddRange(extendedQuery.Methods);

            var query = searchBehaviour(extendedQuery.Query);
            var newQuery = new LuceneQuery(query, extendedQuery.Filter, methods, extendedQuery.VirtualFieldProcessors,
                extendedQuery.FacetQueries, extendedQuery.UsedAnalyzers, extendedQuery.ExecutionContexts);
            var linqToLucene = new LinqToLuceneIndex<T>((LuceneSearchContext)context, new IExecutionContext[0]);

            return linqToLucene.Execute<SearchResults<T>>(newQuery);
        }
    }
}