/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/session.py
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revision 241 by bh, Wed Jul 24 17:16:17 2002 UTC revision 851 by bh, Wed May 7 15:11:12 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
11  from Thuban.Lib.connector import Publisher  import os
12    from tempfile import mktemp
13    import weakref
14    
15  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \
16       LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \       MAP_LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
17       LAYER_LEGEND_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED,\       LAYER_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED,\
18       EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED, CHANGED       EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED, CHANGED
19    
20  from base import TitledObject, Modifiable  from Thuban import _
21    
22    from base import TitledObject, Modifiable
23  from map import Map  from map import Map
24    from data import ShapefileStore
25    
26    from transientdb import TransientDatabase
27    
28    class AutoRemoveFile:
29    
30        """Remove a file once all references go away."""
31    
32        def __init__(self, filename, tempdir = None):
33            """Initialize the AutoRemoveFile
34    
35            Parameters:
36               filename -- The name of the file to remove in __del__
37               tempdir -- Another object simple stored as an instance variable.
38    
39            As the name suggests the tempdir parameter is intended for a
40            temporary directory the file might be located in. The intended
41            use is that it's an instance of AutoRemoveDir.
42            """
43            self.filename = filename
44            self.tempdir = tempdir
45    
46        def __del__(self, remove = os.remove):
47            remove(self.filename)
48    
49    class AutoRemoveDir:
50    
51        """Remove a directory once all references go away
52    
53        The intended use of this class together with AutoRemoveFile is for
54        temporary directories and files containd therein. An AutoRemoveDir
55        should be instantiated for the directory and passed as the tempdir
56        parameter to every AutoRemoveFile instance created for files in the
57        directory. An AutoRemoveFile shold be instantiated for every file
58        created in the directory so that the directory is automatically
59        removed once the last file is removed.
60        """
61    
62        def __init__(self, filename):
63            """Initialize the AutoRemoveDir
64    
65            The parameter is the name of the directory.
66            """
67            self.filename = filename
68    
69        def __del__(self, rmdir = os.rmdir):
70            rmdir(self.filename)
71    
72    
73    # WeakKey dictionary mapping objects like the transient_db to
74    # AutoRemoveDir or AutoRemoveFile instances to make sure that the
75    # temporary files and the directory are deleted but not before the
76    # objects that use them go away.
77    auto_remover = weakref.WeakKeyDictionary()
78    
79  class Session(TitledObject, Modifiable):  class Session(TitledObject, Modifiable):
80    
# Line 36  class Session(TitledObject, Modifiable): Line 92  class Session(TitledObject, Modifiable):
92    
93          EXTENSIONS_CHANGED -- Extensions were added, removed.          EXTENSIONS_CHANGED -- Extensions were added, removed.
94    
95          LAYERS_CHANGED -- Same as the map's event of the same name.          MAP_LAYERS_CHANGED -- Same as the map's event of the same name.
96                            It's simply resent from the session to make                            It's simply resent from the session to make
97                            subscriptions easier.                            subscriptions easier.
98    
# Line 51  class Session(TitledObject, Modifiable): Line 107  class Session(TitledObject, Modifiable):
107      # message channels that have to be forwarded from maps contained in      # message channels that have to be forwarded from maps contained in
108      # the session.      # the session.
109      forwarded_channels = (      forwarded_channels = (
110            # generic channels
111            CHANGED,
112    
113          # map specific channels          # map specific channels
114          MAP_PROJECTION_CHANGED,          MAP_PROJECTION_CHANGED,
115          LAYERS_CHANGED,          MAP_LAYERS_CHANGED,
116    
117          # layer channels forwarded by the map          # layer channels forwarded by the map
118          LAYER_PROJECTION_CHANGED,          LAYER_PROJECTION_CHANGED,
119          LAYER_LEGEND_CHANGED,          LAYER_CHANGED,
120          LAYER_VISIBILITY_CHANGED,          LAYER_VISIBILITY_CHANGED,
121    
122          # channels forwarded by an extension          # channels forwarded by an extension
# Line 70  class Session(TitledObject, Modifiable): Line 129  class Session(TitledObject, Modifiable):
129          self.filename = None          self.filename = None
130          self.maps = []          self.maps = []
131          self.tables = []          self.tables = []
132            self.shapestores = []
133          self.extensions = []          self.extensions = []
134            self.temp_dir = None
135            self.transient_db = None
136    
137      def changed(self, channel = None, *args):      def changed(self, channel = None, *args):
138          """Like the inherited version but issue a CHANGED message as well.          """Like the inherited version but issue a CHANGED message as well.
# Line 117  class Session(TitledObject, Modifiable): Line 179  class Session(TitledObject, Modifiable):
179              extension.Subscribe(channel, self.forward, channel)              extension.Subscribe(channel, self.forward, channel)
180          self.changed(EXTENSIONS_CHANGED)          self.changed(EXTENSIONS_CHANGED)
181    
182        def ShapeStores(self):
183            """Return a list of all ShapeStore objects open in the session"""
184            return [store() for store in self.shapestores]
185    
186        def _add_shapestore(self, store):
187            """Internal: Add the shapestore to the list of shapestores"""
188            self.shapestores.append(weakref.ref(store,
189                                                self._clean_weak_store_refs))
190    
191        def _clean_weak_store_refs(self, weakref):
192            """Internal: Remove the weakref from the shapestores list"""
193            self.shapestores = [store for store in self.shapestores
194                                      if store is not weakref]
195    
196        def Tables(self):
197            """Return a list of all table objects open in the session"""
198            # Tables are only available from shapestores at the moment, so
199            # we just take them from there
200            return [store.Table() for store in self.ShapeStores()]
201    
202        def temp_directory(self):
203            """
204            Return the name of the directory for session specific temporary files
205    
206            Create the directory if it doesn't exist yet.
207            """
208            if self.temp_dir is None:
209                temp_dir = mktemp()
210                os.mkdir(temp_dir, 0700)
211                self.temp_dir = temp_dir
212                self.temp_dir_remover = AutoRemoveDir(self.temp_dir)
213            return self.temp_dir
214    
215        def OpenShapefile(self, filename):
216            """Return a shapefile store object for the data in the given file"""
217            store = ShapefileStore(self, filename)
218            self._add_shapestore(store)
219            return store
220    
221        def TransientDB(self):
222            if self.transient_db is None:
223                filename = os.path.join(self.temp_directory(), "transientdb")
224                self.transient_db = TransientDatabase(filename)
225                #print self.temp_dir_remover
226                auto_remover[self.transient_db] = AutoRemoveFile(filename,
227                                                            self.temp_dir_remover)
228            return self.transient_db
229    
230      def Destroy(self):      def Destroy(self):
231          for map in self.maps:          for map in self.maps:
232              map.Destroy()              map.Destroy()
233          self.maps = []          self.maps = []
234          self.tables = []          self.tables = []
235          Publisher.Destroy(self)          Modifiable.Destroy(self)
236    
237            # Close the transient DB explicitly so that it removes any
238            # journal files from the temporary directory
239            if self.transient_db is not None:
240                self.transient_db.close()
241    
242      def forward(self, *args):      def forward(self, *args):
243          """Reissue events.          """Reissue events.
# Line 159  class Session(TitledObject, Modifiable): Line 274  class Session(TitledObject, Modifiable):
274      def TreeInfo(self):      def TreeInfo(self):
275          items = []          items = []
276          if self.filename is None:          if self.filename is None:
277              items.append("Filename:")              items.append(_("Filename:"))
278          else:          else:
279              items.append("Filename: %s" % self.filename)              items.append(_("Filename: %s") % self.filename)
280    
281          if self.WasModified():          if self.WasModified():
282              items.append("Modified")              items.append(_("Modified"))
283          else:          else:
284              items.append("Unmodified")              items.append(_("Unmodified"))
285    
286          items.extend(self.maps)          items.extend(self.maps)
287          items.extend(self.extensions)          items.extend(self.extensions)
288    
289          return ("Session: %s" % self.title, items)          return (_("Session: %s") % self.title, items)
290    
291    
292  def create_empty_session():  def create_empty_session():
293      """Return an empty session useful as a starting point"""      """Return an empty session useful as a starting point"""
294      import os      import os
295      session = Session('unnamed session')      session = Session(_('unnamed session'))
296      session.SetFilename(None)      session.SetFilename(None)
297      session.AddMap(Map('unnamed map'))      session.AddMap(Map(_('unnamed map')))
298      session.UnsetModified()      session.UnsetModified()
299      return session      return session
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