beagled/FileSystemQueryable/LuceneNameResolver.cs

   1 //
   2 // LuceneNameResolver.cs
   3 //
   4 // Copyright (C) 2005 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.Collections;
  29 using System.IO;
  30
  31 using Lucene.Net.Documents;
  32 using Lucene.Net.Index;
  33 using LNS = Lucene.Net.Search;
  34
  35 using Beagle.Daemon;
  36 using Beagle.Util;
  37
  38 namespace Beagle.Daemon.FileSystemQueryable {
  39
  40         //
  41         // This is just a LuceneQueryingDriver with the ability to do the
  42         // special secondary-index-only queries we need to map internal uris
  43         // back to filenames.
  44         //
  45
  46         public class LuceneNameResolver : LuceneQueryingDriver {
  47
  48                 public class NameInfo {
  49                         public Guid   Id;
  50                         public Guid   ParentId;
  51                         public string Name;
  52                         public bool   IsDirectory;
  53                 }
  54
  55                 public LuceneNameResolver (string index_name, int minor_version, bool read_only)
  56                         : base (index_name, minor_version, read_only)
  57                 {
  58
  59                 }
  60
  61                 ////////////////////////////////////////////////////////////////
  62
  63
  64                 private NameInfo DocumentToNameInfo (Document doc)
  65                 {
  66                         NameInfo info;
  67                         info = new NameInfo ();
  68
  69                         string str;
  70                         str = doc.Get ("Uri");
  71                         info.Id = GuidFu.FromUriString (str);
  72
  73                         bool have_name = false;
  74                         bool have_parent_id = false;
  75                         bool have_is_dir = false;
  76
  77                         foreach (Field f in doc.Fields ()) {
  78                                 Property prop;
  79                                 prop = GetPropertyFromDocument (f, doc, false);
  80                                 if (prop == null)
  81                                         continue;
  82
  83                                 switch (prop.Key) {
  84
  85                                 case FileSystemQueryable.ExactFilenamePropKey:
  86                                         info.Name = prop.Value;
  87                                         have_name = true;
  88                                         break;
  89
  90                                 case FileSystemQueryable.ParentDirUriPropKey:
  91                                         info.ParentId = GuidFu.FromUriString (prop.Value);
  92                                         have_parent_id = true;
  93                                         break;
  94
  95                                 case FileSystemQueryable.IsDirectoryPropKey:
  96                                         info.IsDirectory = (prop.Value == "true");
  97                                         have_is_dir = true;
  98                                         break;
  99                                 }
 100
 101                                 if (have_name && have_parent_id && have_is_dir)
 102                                         break;
 103                         }
 104
 105                         return info;
 106                 }
 107
 108                 ////////////////////////////////////////////////////////////////
 109
 110                 // Pull a single record out of the index
 111
 112                 private class SingletonCollector : LNS.HitCollector {
 113
 114                         public int MatchId = -1;
 115
 116                         public override void Collect (int id, float score)
 117                         {
 118                                 if (MatchId != -1)
 119                                         throw new Exception ("What you talkin' about Willis?");
 120
 121                                 MatchId = id;
 122                         }
 123                 }
 124
 125                 public NameInfo GetNameInfoById (Guid id)
 126                 {
 127                         Uri uri;
 128                         uri = GuidFu.ToUri (id);
 129
 130                         LNS.Query query;
 131                         query = UriQuery ("Uri", uri);
 132
 133                         SingletonCollector collector;
 134                         collector = new SingletonCollector ();
 135
 136                         LNS.IndexSearcher searcher;
 137                         searcher = new LNS.IndexSearcher (SecondaryStore);
 138                         searcher.Search (query, null, collector);
 139
 140                         NameInfo info = null;
 141
 142                         if (collector.MatchId != -1) {
 143                                 Document doc;
 144                                 doc = searcher.Doc (collector.MatchId);
 145                                 info = DocumentToNameInfo (doc);
 146                         }
 147
 148                         searcher.Close ();
 149
 150                         return info;
 151                 }
 152
 153                 ////////////////////////////////////////////////////////////////
 154
 155                 public Guid GetIdByNameAndParentId (string name, Guid parent_id)
 156                 {
 157                         string parent_uri_str;
 158                         parent_uri_str = GuidFu.ToUriString (parent_id);
 159
 160                         string key1;
 161                         key1 = PropertyToFieldName (PropertyType.Keyword, FileSystemQueryable.ParentDirUriPropKey);
 162
 163                         string key2;
 164                         key2 = PropertyToFieldName (PropertyType.Keyword, FileSystemQueryable.ExactFilenamePropKey);
 165
 166                         LNS.Query q1;
 167                         q1 = new LNS.TermQuery (new Term (key1, parent_uri_str));
 168
 169                         LNS.Query q2;
 170                         q2 = new LNS.TermQuery (new Term (key2, name));
 171
 172                         LNS.BooleanQuery query;
 173                         query = new LNS.BooleanQuery ();
 174                         query.Add (q1, true, false);
 175                         query.Add (q2, true, false);
 176
 177                         SingletonCollector collector;
 178                         collector = new SingletonCollector ();
 179
 180                         LNS.IndexSearcher searcher;
 181                         searcher = new LNS.IndexSearcher (SecondaryStore);
 182                         searcher.Search (query, null, collector);
 183
 184                         Guid id;
 185                         if (collector.MatchId != -1) {
 186                                 Document doc;
 187                                 doc = searcher.Doc (collector.MatchId);
 188                                 id = GuidFu.FromUriString (doc.Get ("Uri"));
 189                         } else
 190                                 id = Guid.Empty;
 191
 192                         searcher.Close ();
 193
 194                         return id;
 195                 }
 196
 197                 ////////////////////////////////////////////////////////////////
 198
 199                 // Pull all of the directories out of the index and cache them
 200
 201                 // Not to be confused with LuceneQueryingDriver.BitArrayHitCollector
 202                 private class BitArrayHitCollector : LNS.HitCollector {
 203
 204                         private BetterBitArray matches;
 205
 206                         public BitArrayHitCollector (BetterBitArray matches)
 207                         {
 208                                 this.matches = matches;
 209                         }
 210
 211                         public override void Collect (int id, float score)
 212                         {
 213                                 matches [id] = true;
 214                         }
 215                 }
 216
 217                 public ICollection GetAllDirectoryNameInfo ()
 218                 {
 219                         // First we assemble a query to find all of the directories.
 220                         string field_name;
 221                         field_name = PropertyToFieldName (PropertyType.Keyword,
 222                                                           FileSystemQueryable.IsDirectoryPropKey);
 223
 224                         LNS.Query query;
 225                         query = new LNS.TermQuery (new Term (field_name, "true"));
 226
 227                         // Then we actually run the query
 228                         LNS.IndexSearcher searcher;
 229                         searcher = new LNS.IndexSearcher (SecondaryStore);
 230
 231                         BetterBitArray matches;
 232                         matches = new BetterBitArray (searcher.MaxDoc ());
 233
 234                         BitArrayHitCollector collector;
 235                         collector = new BitArrayHitCollector (matches);
 236
 237                         searcher.Search (query, null, collector);
 238
 239                         // Finally we pull all of the matching documents,
 240                         // convert them to NameInfo, and store them in a list.
 241
 242                         ArrayList match_list = new ArrayList ();
 243                         int i = 0;
 244                         while (i < matches.Count) {
 245
 246                                 i = matches.GetNextTrueIndex (i);
 247                                 if (i >= matches.Count)
 248                                         break;
 249
 250                                 Document doc;
 251                                 doc = searcher.Doc (i);
 252
 253                                 NameInfo info;
 254                                 info = DocumentToNameInfo (doc);
 255
 256                                 match_list.Add (info);
 257
 258                                 ++i;
 259                         }
 260
 261                         return match_list;
 262                 }
 263         }
 264 }