/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/session.py

Diff of /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 1268 by bh,
Fri Jun 20 16:10:12 2003 UTC
 Line 15 
 import weakref
  from messages import MAPS_CHANGED, EXTENSIONS_CHANGED, FILENAME_CHANGED, \
       MAP_LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
       LAYER_CHANGED, LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED,\
-      EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED, CHANGED
+      EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED, CHANGED, \
+      TABLE_REMOVED
  from Thuban import _
  from base import TitledObject, Modifiable
  from map import Map
  from data import ShapefileStore
+ from table import DBFTable
  from transientdb import TransientDatabase, AutoTransientTable
-Line 201 
 class Session(TitledObject, Modifiable):
+Line 203 
 class Session(TitledObject, Modifiable):
          """
          return self.tables + [store.Table() for store in self.ShapeStores()]
+     def UnreferencedTables(self):
+         """Return the tables that are not referenced by other data sources"""
+         known = {}
+         for table in self.tables:
+             known[id(table)] = 0
+         for table in self.tables + self.ShapeStores():
+             for dep in table.Dependencies():
+                 known[id(dep)] = 1
+         return [table for table in self.tables if known[id(table)] == 0]
      def AddTable(self, table):
          """Add the table to the session
-Line 225 
 class Session(TitledObject, Modifiable):
+Line 237 
 class Session(TitledObject, Modifiable):
          else:
              transient_table = table
          self.tables.append(transient_table)
+         self.changed()
          return transient_table
+     def RemoveTable(self, table):
+         """Remove the table from the session.
+         The table object must be a table object previously returned by
+         the AddTable method. If the table is not part of the session
+         raise a ValueError.
+         Issue a TABLE_REMOVED message after the table has been removed.
+         The message has the removed table as the single parameter.
+         """
+         tables = [t for t in self.tables if t is not table]
+         if len(tables) == len(self.tables):
+             raise ValueError
+         self.tables = tables
+         self.changed(TABLE_REMOVED, table)
+     def DataContainers(self):
+         """Return all data containers, i.e. shapestores and tables"""
+         return self.tables + self.ShapeStores()
+     def OpenTableFile(self, filename):
+         """Open the table file filename and return the table object.
+         The filename argument must be the name of a DBF file.
+         """
+         return self.AddTable(DBFTable(filename))
      def temp_directory(self):
          """
          Return the name of the directory for session specific temporary files
-Line 246 
 class Session(TitledObject, Modifiable):
+Line 286 
 class Session(TitledObject, Modifiable):
          self._add_shapestore(store)
          return store
+     def AddShapeStore(self, shapestore):
+         """Add the shapestore to the session.
+         The session only holds a weak reference to the shapestore, so it
+         will automatically be removed from the session when the last
+         reference goes away.
+         """
+         self._add_shapestore(shapestore)
+         return shapestore
      def TransientDB(self):
          if self.transient_db is None:
              filename = os.path.join(self.temp_directory(), "transientdb")

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