beagled/FileAttributesStore.cs

   1 //
   2 // FileAttributesStore.cs
   3 //
   4 // Copyright (C) 2005 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a copy
   9 // of this software and associated documentation files (the "Software"), to deal
  10 // in the Software without restriction, including without limitation the rights
  11 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 // copies of the Software, and to permit persons to whom the Software is
  13 // furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in all
  16 // 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 FROM,
  23 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24 // SOFTWARE.
  25 //
  26
  27 using System;
  28
  29 using Beagle.Util;
  30
  31 namespace Beagle.Daemon {
  32
  33         public class FileAttributesStore {
  34
  35                 private IFileAttributesStore ifas;
  36
  37                 public FileAttributesStore (IFileAttributesStore ifas)
  38                 {
  39                         this.ifas = ifas;
  40                 }
  41
  42                 public FileAttributes Read (string path)
  43                 {
  44                         lock (ifas) {
  45                                 return ifas.Read (path);
  46                         }
  47                 }
  48
  49                 public FileAttributes ReadOrCreate (string path, Guid unique_id, out bool created)
  50                 {
  51                         lock (ifas) {
  52                                 created = false;
  53
  54                                 FileAttributes attr = ifas.Read (path);
  55                                 if (attr == null) {
  56                                         attr = new FileAttributes ();
  57                                         attr.UniqueId = unique_id;
  58                                         attr.Path = path;
  59                                         ifas.Write (attr);
  60                                         created = true;
  61                                 }
  62                                 // FIXME: If we were able to successfully read attributes,
  63                                 // and if attr.UniqueId != unique_id, it probably means
  64                                 // that something bad happened.  Right?  Should we throw
  65                                 // an exception?
  66                                 return attr;
  67                         }
  68                 }
  69
  70                 public FileAttributes ReadOrCreate (string path, Guid unique_id)
  71                 {
  72                         bool dummy;
  73                         return ReadOrCreate (path, unique_id, out dummy);
  74                 }
  75
  76                 public FileAttributes ReadOrCreate (string path)
  77                 {
  78                         return ReadOrCreate (path, Guid.NewGuid ());
  79                 }
  80
  81                 public bool Write (FileAttributes attr)
  82                 {
  83                         lock (ifas) {
  84                                 attr.LastAttrTime = DateTime.Now;
  85                                 return ifas.Write (attr);
  86                         }
  87                 }
  88
  89                 public void Drop (string path)
  90                 {
  91                         lock (ifas) {
  92                                 ifas.Drop (path);
  93                         }
  94                 }
  95
  96                 public void BeginTransaction ()
  97                 {
  98                         lock (ifas)
  99                                 ifas.BeginTransaction ();
 100
 101                 }
 102
 103                 public void CommitTransaction ()
 104                 {
 105                         lock (ifas)
 106                                 ifas.CommitTransaction ();
 107                 }
 108
 109                 //////////////////////////////////////////////////////////
 110
 111                 public bool IsUpToDate (string path, Filter filter)
 112                 {
 113                         FileAttributes attr;
 114
 115                         attr = Read (path);
 116
 117                         // If there are no attributes set on the file, there is no
 118                         // way that we can be up-to-date.
 119                         if (attr == null)
 120                                 return false;
 121
 122                         // Note that when filter is set to null, we ignore
 123                         // any existing filter data.  That might not be the
 124                         // expected behavior...
 125                         if (filter != null) {
 126
 127                                 if (! attr.HasFilterInfo)
 128                                         return false;
 129
 130                                 if (attr.FilterName != filter.Name)
 131                                         return false;
 132
 133                                 // FIXME: Obviously we want to reindex if
 134                                 // attr.FilterVersion < filter.Version.
 135                                 // But what if the filter we would use is older
 136                                 // than the one that was previously used?
 137                                 if (attr.FilterVersion != filter.Version)
 138                                         return false;
 139                         }
 140
 141                         if (FileSystem.GetLastWriteTime (path) > attr.LastWriteTime)
 142                                 return false;
 143
 144                         return true;
 145                 }
 146
 147                 public bool IsUpToDate (string path)
 148                 {
 149                         return IsUpToDate (path, null);
 150                 }
 151
 152                 //////////////////////////////////////////////////////////
 153
 154                 // A convenience routine.
 155                 public void AttachLastWriteTime (string path, DateTime mtime)
 156                 {
 157                         FileAttributes attr = ReadOrCreate (path);
 158                         attr.LastWriteTime = mtime;
 159                         if (! Write (attr))
 160                                 Logger.Log.Warn ("Couldn't store file attributes for {0}", path);
 161                 }
 162         }
 163 }