beagled/Queryable.cs

   1 //
   2 // Queryable.cs
   3 //
   4 // Copyright (C) 2004 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
  28 using System;
  29 using System.Collections;
  30
  31 using Beagle.Util;
  32 using Beagle;
  33
  34 namespace Beagle.Daemon {
  35
  36         public class Queryable {
  37
  38                 private QueryableFlavor flavor;
  39                 private IQueryable iqueryable;
  40
  41                 public Queryable (QueryableFlavor _flavor,
  42                                   IQueryable _iqueryable)
  43                 {
  44                         flavor = _flavor;
  45                         iqueryable = _iqueryable;
  46                 }
  47
  48                 public void Start ()
  49                 {
  50                         iqueryable.Start ();
  51                 }
  52
  53                 public string Name {
  54                         get { return flavor.Name; }
  55                 }
  56
  57                 public QueryDomain Domain {
  58                         get { return flavor.Domain; }
  59                 }
  60
  61                 public bool AcceptQuery (Query query)
  62                 {
  63                         return query != null
  64                                 && ! query.IsEmpty
  65                                 && query.AllowsSource (Name)
  66                                 && query.AllowsDomain (Domain)
  67                                 && iqueryable.AcceptQuery (query);
  68                 }
  69
  70                 public int GetItemCount ()
  71                 {
  72                         int n = -1;
  73                         try {
  74                                 n = iqueryable.GetItemCount ();
  75                         } catch (Exception ex) {
  76                                 Logger.Log.Warn ("Couldn't get item count for '{0}'", Name);
  77                                 Logger.Log.Warn (ex);
  78                         }
  79                         return n;
  80                 }
  81
  82                 public void DoQuery (Query query, IQueryResult result, IQueryableChangeData change_data)
  83                 {
  84                         try {
  85                                 iqueryable.DoQuery (query, result, change_data);
  86                         } catch (Exception ex) {
  87                                 Logger.Log.Warn ("Caught exception calling DoQuery on '{0}'", Name);
  88                                 Logger.Log.Warn (ex);
  89                         }
  90                 }
  91
  92                 public string GetSnippet (string[] query_terms, Hit hit)
  93                 {
  94                         if (hit == null)
  95                                 return null;
  96
  97                         // Sanity-check: make sure this Hit actually came out of this Queryable
  98                         if (QueryDriver.GetQueryable (hit.SourceObjectName) != this) {
  99                                 string msg = String.Format ("Queryable mismatch in GetSnippet: {0} vs {1}", hit.SourceObjectName, this);
 100                                 throw new Exception (msg);
 101                         }
 102
 103                         try {
 104                                 return iqueryable.GetSnippet (query_terms, hit);
 105                         } catch (Exception ex) {
 106                                 Logger.Log.Warn ("Caught exception calling DoQuery on '{0}'", Name);
 107                                 Logger.Log.Warn (ex);
 108                         }
 109
 110                         return null;
 111                 }
 112         }
 113 }