Adding faceted search capabilities

--HG--
branch : 1.x

src/Orchard.Tests.Modules/Indexing/LuceneSearchBuilderTests.cs

@@ -639,5 +639,24 @@ namespace Orchard.Tests.Modules.Indexing {
                 .WithField("field3", 3).Mandatory().AsFilter()
                 .Count(), Is.EqualTo(1));
         }
+
+        [Test]
+        public void ShouldReturnFacetedResults() {
+            _provider.CreateIndex("default");
+            _provider.Store("default", _provider.New(1).Add("body", "michael is in the kitchen").Analyze());
+            _provider.Store("default", _provider.New(2).Add("body", "michael has a cousin named michel").Analyze());
+            _provider.Store("default", _provider.New(3).Add("body", "speak inside the mic").Analyze());
+            _provider.Store("default", _provider.New(4).Add("body", "a dog is pursuing a cat").Analyze());
+            _provider.Store("default", _provider.New(5).Add("body", "michael speaks to elephants").Analyze());
+
+            var michael = SearchBuilder.WithField("body", "michael").GetBits();
+            var speak = SearchBuilder.WithField("body", "speak").GetBits();
+            Assert.That(michael.Count(), Is.EqualTo(3));
+            Assert.That(speak.Count(), Is.EqualTo(2));
+
+            Assert.That(speak.And(michael).Count(), Is.EqualTo(1));
+            Assert.That(speak.Or(michael).Count(), Is.EqualTo(4));
+            Assert.That(speak.Xor(michael).Count(), Is.EqualTo(3));
+        }
     }
 }

src/Orchard.Web/Modules/Lucene/Lucene.csproj

@@ -21,6 +21,10 @@
     <UpgradeBackupLocation>
     </UpgradeBackupLocation>
     <OldToolsVersion>4.0</OldToolsVersion>
+    <IISExpressSSLPort />
+    <IISExpressAnonymousAuthentication />
+    <IISExpressWindowsAuthentication />
+    <IISExpressUseClassicPipelineMode />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -66,6 +70,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Services\LuceneIndexProvider.cs" />
     <Compile Include="Services\LuceneSearchBuilder.cs" />
+    <Compile Include="Services\SearchBits.cs" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="Module.txt" />

src/Orchard.Web/Modules/Lucene/Services/LuceneSearchBuilder.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
@@ -6,6 +7,7 @@ using Lucene.Models;
 using Lucene.Net.Index;
 using Lucene.Net.Search;
 using Lucene.Net.Store;
+using Lucene.Net.Util;
 using Orchard.Indexing;
 using Orchard.Logging;
 using Lucene.Net.Documents;
@@ -355,6 +357,30 @@ namespace Lucene.Services {
 
         }
 
+        public ISearchBits GetBits() {
+            var query = CreateQuery();
+            IndexSearcher searcher;
+
+            try {
+                searcher = new IndexSearcher(_directory, true);
+            }
+            catch {
+                // index might not exist if it has been rebuilt
+                Logger.Information("Attempt to read a none existing index");
+                return null;
+            }
+
+            try {
+                var filter = new QueryWrapperFilter(query);
+                var bits = filter.GetDocIdSet(searcher.GetIndexReader());
+                var disi = new OpenBitSetDISI(bits.Iterator(), searcher.MaxDoc());
+                return new SearchBits(disi);
+            }
+            finally {
+                searcher.Close();
+            }
+        }
+
         public ISearchHit Get(int documentId) {
             var query = new TermQuery(new Term("id", documentId.ToString(CultureInfo.InvariantCulture)));
 

src/Orchard.Web/Modules/Lucene/Services/SearchBits.cs

@@ -0,0 +1,43 @@
+using System;
+using Lucene.Net.Util;
+using Orchard.Indexing;
+
+namespace Lucene.Services {
+    public class SearchBits : ISearchBits {
+        internal readonly OpenBitSet _openBitSet;
+
+        public SearchBits(OpenBitSet openBitSet) {
+            _openBitSet = openBitSet;
+        }
+
+        public ISearchBits And(ISearchBits other) {
+            return Apply(other, (x, y) => x.And(y));
+        }
+
+        public ISearchBits Or(ISearchBits other) {
+            return Apply(other, (x, y) => x.Or(y));
+        }
+
+        public ISearchBits Xor(ISearchBits other) {
+            return Apply(other, (x, y) => x.Xor(y));
+        }
+
+        public long Count() {
+            return _openBitSet.Cardinality();
+        }
+
+        private ISearchBits Apply(ISearchBits other, Action<OpenBitSet, OpenBitSet> operation) {
+            var bitset = (OpenBitSet)_openBitSet.Clone();
+            var otherBitSet = other as SearchBits;
+
+            if (otherBitSet == null) {
+                throw new InvalidOperationException("The other bitset must be of type OpenBitSet");
+            }
+
+            operation(bitset, otherBitSet._openBitSet);
+
+            return new SearchBits(bitset);
+
+        }
+    }
+}

src/Orchard/Indexing/ISearchBuilder.cs

@@ -57,6 +57,7 @@ namespace Orchard.Indexing {
         ISearchBuilder Slice(int skip, int count);
         IEnumerable<ISearchHit> Search();
         ISearchHit Get(int documentId);
+        ISearchBits GetBits();
         int Count();
 
     }

src/Orchard/Indexing/NullSearchBuilder.cs

@@ -127,6 +127,11 @@ namespace Orchard.Indexing {
         public ISearchHit Get(int documentId) {
             return null;
         }
+
+        public ISearchBits GetBits() {
+            throw new NotImplementedException();
+        }
+
         public int Count() {
             return 0;
         }

src/Orchard/Orchard.Framework.csproj

@@ -238,6 +238,7 @@
     <Compile Include="FileSystems\LockFile\LockFile.cs" />
     <Compile Include="FileSystems\LockFile\DefaultLockFileManager.cs" />
     <Compile Include="FileSystems\Media\FileSystemStorageProvider.cs" />
+    <Compile Include="Indexing\ISearchBits.cs" />
     <Compile Include="Localization\Services\CurrentCultureWorkContext.cs" />
     <Compile Include="Localization\Services\DefaultLocalizedStringManager.cs" />
     <Compile Include="Localization\Services\ILocalizedStringManager.cs" />