/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/session.py
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revision 982 by bh, Thu May 22 12:02:15 2003 UTC revision 1282 by bh, Mon Jun 23 09:47:18 2003 UTC
# Line 15  import weakref Line 15  import weakref
15  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \
16       MAP_LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \       MAP_LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
17       LAYER_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         TABLE_REMOVED
20    
21  from Thuban import _  from Thuban import _
22    
23  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
24  from map import Map  from map import Map
25  from data import ShapefileStore  from data import ShapefileStore
26    from table import DBFTable
27    
28  from transientdb import TransientDatabase, AutoTransientTable  from transientdb import TransientDatabase, AutoTransientTable
29    
# Line 199  class Session(TitledObject, Modifiable): Line 201  class Session(TitledObject, Modifiable):
201          The list includes all tables that are indirectly opened through          The list includes all tables that are indirectly opened through
202          shape stores and the tables that have been opened explicitly.          shape stores and the tables that have been opened explicitly.
203          """          """
204          return self.tables + [store.Table() for store in self.ShapeStores()]          tables = self.tables[:]
205            ids = {}
206            for t in tables:
207                ids[id(t)] = 1
208            for store in self.ShapeStores():
209                t = store.Table()
210                if id(t) not in ids:
211                    ids[id(t)] = 1
212                    tables.append(t)
213            return tables
214    
215        def UnreferencedTables(self):
216            """Return the tables that are not referenced by other data sources"""
217            known = {}
218            for table in self.tables:
219                known[id(table)] = 0
220            for table in self.tables + self.ShapeStores():
221                for dep in table.Dependencies():
222                    known[id(dep)] = 1
223            return [table for table in self.tables if known[id(table)] == 0]
224    
225      def AddTable(self, table):      def AddTable(self, table):
226          """Add the table to the session          """Add the table to the session
# Line 225  class Session(TitledObject, Modifiable): Line 246  class Session(TitledObject, Modifiable):
246          else:          else:
247              transient_table = table              transient_table = table
248          self.tables.append(transient_table)          self.tables.append(transient_table)
249            self.changed()
250          return transient_table          return transient_table
251    
252        def RemoveTable(self, table):
253            """Remove the table from the session.
254    
255            The table object must be a table object previously returned by
256            the AddTable method. If the table is not part of the session
257            raise a ValueError.
258    
259            Issue a TABLE_REMOVED message after the table has been removed.
260            The message has the removed table as the single parameter.
261            """
262            tables = [t for t in self.tables if t is not table]
263            if len(tables) == len(self.tables):
264                raise ValueError
265            self.tables = tables
266            self.changed(TABLE_REMOVED, table)
267    
268        def DataContainers(self):
269            """Return all data containers, i.e. shapestores and tables"""
270            return self.tables + self.ShapeStores()
271    
272        def OpenTableFile(self, filename):
273            """Open the table file filename and return the table object.
274    
275            The filename argument must be the name of a DBF file.
276            """
277            return self.AddTable(DBFTable(filename))
278    
279      def temp_directory(self):      def temp_directory(self):
280          """          """
281          Return the name of the directory for session specific temporary files          Return the name of the directory for session specific temporary files
# Line 246  class Session(TitledObject, Modifiable): Line 295  class Session(TitledObject, Modifiable):
295          self._add_shapestore(store)          self._add_shapestore(store)
296          return store          return store
297    
298        def AddShapeStore(self, shapestore):
299            """Add the shapestore to the session.
300    
301            The session only holds a weak reference to the shapestore, so it
302            will automatically be removed from the session when the last
303            reference goes away.
304            """
305            self._add_shapestore(shapestore)
306            return shapestore
307    
308      def TransientDB(self):      def TransientDB(self):
309          if self.transient_db is None:          if self.transient_db is None:
310              filename = os.path.join(self.temp_directory(), "transientdb")              filename = os.path.join(self.temp_directory(), "transientdb")
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