beagled/StaticQueryable.cs

   1 //
   2 // StaticQueryable.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.IO;
  29 using System.Collections;
  30 using System.Threading;
  31
  32 using System.Xml;
  33 using System.Xml.Serialization;
  34
  35 using Beagle.Util;
  36
  37 namespace Beagle.Daemon {
  38
  39         public class StaticQueryable : LuceneQueryable  {
  40
  41                 protected TextCache text_cache;
  42
  43                 public StaticQueryable (string index_name, string index_path, bool read_only_mode) : base (index_path, read_only_mode)
  44                 {
  45                         Logger.Log.Debug ("Initializing static queryable: {0}", index_path);
  46
  47                         if (Directory.Exists (Path.Combine (index_path, "TextCache"))) {
  48                                 try {
  49                                         text_cache = new TextCache (index_path, true);
  50                                 } catch (UnauthorizedAccessException) {
  51                                         Logger.Log.Warn ("Unable to purge static queryable text cache in {0}.  Will run without it.", index_path);
  52                                 }
  53                         }
  54                 }
  55
  56                 override public string GetSnippet (string[] query_terms, Hit hit)
  57                 {
  58                         if (text_cache == null)
  59                                 return null;
  60
  61                         // Look up the hit in our local text cache.
  62                         TextReader reader = text_cache.GetReader (hit.Uri);
  63                         if (reader == null)
  64                                 return null;
  65
  66                         string snippet = SnippetFu.GetSnippet (query_terms, reader);
  67                         reader.Close ();
  68
  69                         return snippet;
  70                 }
  71
  72                 override protected bool HitIsValid (Uri uri)
  73                 {
  74                         // We can't check anything else than file uris
  75                         if (! uri.IsFile)
  76                                 return true;
  77
  78                         // FIXME: This is a hack, we need to support parent Uri's in some sane way
  79                         try {
  80                                 int j = uri.LocalPath.LastIndexOf ('#');
  81                                 return File.Exists ((j == -1) ? uri.LocalPath : uri.LocalPath.Substring (0, j));
  82                         } catch (Exception e) {
  83                                 Logger.Log.Warn ("Exception executing HitIsValid on {0}", uri.LocalPath);
  84                                 return false;
  85                         }
  86                 }
  87         }
  88 }