beagled/IndexerRequest.cs

   1 //
   2 // IndexerRequest.cs
   3 //
   4 // Copyright (C) 2005-2006 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.Xml.Serialization;
  30
  31 using Beagle.Util;
  32
  33 namespace Beagle.Daemon {
  34
  35         public class IndexerRequest {
  36
  37                 public bool OptimizeIndex = false;
  38
  39                 // These two collections are mutually exclusive.  It's an ugly
  40                 // hack, but it's necessary to make XML serialization work
  41                 // easily, and assumes that an IndexerRequest is never changed
  42                 // after it has been serialized.
  43                 private Hashtable indexables_by_uri = null;
  44                 private ArrayList indexables = null;
  45
  46                 public void Clear ()
  47                 {
  48                         OptimizeIndex = false;
  49                         indexables_by_uri = null;
  50                         indexables = null;
  51                 }
  52
  53                 public void Add (Indexable indexable)
  54                 {
  55                         if (indexables != null)
  56                                 throw new Exception ("Attempt to add to a serialized IndexerRequest");
  57
  58                         if (indexable == null)
  59                                 return;
  60
  61                         if (indexables_by_uri == null)
  62                                 indexables_by_uri = UriFu.NewHashtable ();
  63
  64                         Indexable prior;
  65                         prior = indexables_by_uri [indexable.Uri] as Indexable;
  66
  67                         if (prior != null) {
  68
  69                                 switch (indexable.Type) {
  70
  71                                 case IndexableType.Add:
  72                                 case IndexableType.Remove:
  73                                         // Do nothing, and just clobber the prior indexable.
  74                                         break;
  75
  76                                 case IndexableType.PropertyChange:
  77                                         // Merge with the prior indexable.
  78                                         prior.Merge (indexable);
  79                                         indexable = prior;
  80                                         break;
  81                                 }
  82                         }
  83
  84                         indexables_by_uri [indexable.Uri] = indexable;
  85                 }
  86
  87                 public Indexable GetByUri (Uri uri)
  88                 {
  89                         if (indexables_by_uri != null)
  90                                 return indexables_by_uri [uri] as Indexable;
  91
  92                         // Fall back to using the list.  This happens when we
  93                         // have been serialized.  Which is sort of lame.
  94                         foreach (Indexable indexable in indexables) {
  95                                 if (UriFu.Equals (uri, indexable.Uri))
  96                                         return indexable;
  97                         }
  98                         return null;
  99                 }
 100
 101                 [XmlIgnore]
 102                 public ICollection Indexables {
 103                         get {
 104                                 if (indexables != null)
 105                                         return indexables;
 106                                 else if (indexables_by_uri != null)
 107                                         return indexables_by_uri.Values;
 108                                 else
 109                                         return new Indexable [0];
 110                         }
 111                 }
 112
 113                 [XmlArray (ElementName="Indexables")]
 114                 [XmlArrayItem (ElementName="Indexable", Type=typeof (Indexable))]
 115                 public ArrayList IndexablesForSerialization {
 116                         get {
 117                                 if (indexables == null) {
 118                                         indexables = new ArrayList (Indexables);
 119                                         indexables.Sort (); // sort into ascending timestamp order
 120                                 }
 121                                 return indexables;
 122                         }
 123                 }
 124
 125                 [XmlIgnore]
 126                 public int Count {
 127                         get { return Indexables.Count; }
 128                 }
 129
 130                 [XmlIgnore]
 131                 public bool IsEmpty {
 132                         get { return Count == 0 && ! OptimizeIndex; }
 133                 }
 134
 135                 public void Cleanup ()
 136                 {
 137                         foreach (Indexable i in Indexables)
 138                                 i.Cleanup ();
 139                 }
 140         }
 141 }