Adding CurrentCultureFilter implementation

--HG--
branch : 1.x

src/Orchard.Web/Modules/Orchard.Localization/Orchard.Localization.csproj

@@ -13,6 +13,7 @@
     <RootNamespace>Orchard.Localization</RootNamespace>
     <AssemblyName>Orchard.Localization</AssemblyName>
     <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <UseIISExpress>false</UseIISExpress>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -53,6 +54,7 @@
     <Compile Include="Migrations.cs" />
     <Compile Include="Models\LocalizationPart.cs" />
     <Compile Include="Models\LocalizationPartRecord.cs" />
+    <Compile Include="Projections\CurrentCultureFilter.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ResourceManifest.cs" />
     <Compile Include="Services\ILocalizationService.cs" />

src/Orchard.Web/Modules/Orchard.Localization/Projections/CurrentCultureFilter.cs

@@ -0,0 +1,45 @@
+using System;
+using Orchard.ContentManagement;
+using Orchard.Events;
+using Orchard.Localization.Models;
+using Orchard.Localization.Services;
+
+namespace Orchard.Localization.Projections {
+    public interface IFilterProvider : IEventHandler {
+        void Describe(dynamic describe);
+    }
+
+    public class CurrentCultureFilter : IFilterProvider {
+        private readonly IWorkContextAccessor _workContextAccessor;
+        private readonly ICultureManager _cultureManager;
+
+        public CurrentCultureFilter(IWorkContextAccessor workContextAccessor, ICultureManager cultureManager) {
+            _workContextAccessor = workContextAccessor;
+            _cultureManager = cultureManager;
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public void Describe(dynamic describe) {
+            describe.For("Localization", T("Localization"), T("Localization"))
+                .Element("ForCurrentCulture", T("For current culture"), T("Localized content items for current culture"),
+                    (Action<dynamic>)ApplyFilter,
+                    (Func<dynamic, LocalizedString>)DisplayFilter,
+                    null
+                );
+        }
+
+        public void ApplyFilter(dynamic context) {
+            string currentCulture = _workContextAccessor.GetContext().CurrentCulture;
+            var currentCultureId = _cultureManager.GetCultureByName(currentCulture).Id;
+
+            var query = (IHqlQuery)context.Query;
+            context.Query = query.Where(x => x.ContentPartRecord<LocalizationPartRecord>(), x => x.Eq("CultureId", currentCultureId));
+        }
+
+        public LocalizedString DisplayFilter(dynamic context) {
+            return T("For current culture");
+        }
+    }
+}