/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 1251 by jonathan, Fri Jun 20 09:27:55 2003 UTC revision 1638 by bh, Fri Aug 22 18:19:14 2003 UTC
# Line 17  import os Line 17  import os
17    
18  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
19    
 from Thuban.Model.color import Color  
20  from Thuban.Model.layer import Layer, RasterLayer  from Thuban.Model.layer import Layer, RasterLayer
21    
22  from Thuban.Model.classification import \  from Thuban.Model.classification import \
23      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
24    from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
25    from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
26    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
27    
28  from Thuban.Model.xmlwriter import XMLWriter  from Thuban.Model.xmlwriter import XMLWriter
29    from postgisdb import PostGISConnection, PostGISShapeStore
30    
31  def relative_filename(dir, filename):  def relative_filename(dir, filename):
32      """Return a filename relative to dir for the absolute file name absname.      """Return a filename relative to dir for the absolute file name absname.
# Line 37  def relative_filename(dir, filename): Line 40  def relative_filename(dir, filename):
40      else:      else:
41          return filename          return filename
42    
43    
44    def sort_data_stores(stores):
45        """Return a topologically sorted version of the sequence of data containers
46    
47        The list is sorted so that data containers that depend on other data
48        containers have higher indexes than the containers they depend on.
49        """
50        if not stores:
51            return []
52        processed = {}
53        result = []
54        todo = stores[:]
55        while todo:
56            # It doesn't really matter which if the items of todo is
57            # processed next, but if we take the first one, the order is
58            # preserved to some degree which makes writing some of the test
59            # cases easier.
60            container = todo.pop(0)
61            if id(container) in processed:
62                continue
63            deps = [dep for dep in container.Dependencies()
64                        if id(dep) not in processed]
65            if deps:
66                todo.append(container)
67                todo.extend(deps)
68            else:
69                result.append(container)
70                processed[id(container)] = 1
71        return result
72    
73    
74  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
75    
76      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 53  class SessionSaver(XMLWriter): Line 87  class SessionSaver(XMLWriter):
87      def __init__(self, session):      def __init__(self, session):
88          XMLWriter.__init__(self)          XMLWriter.__init__(self)
89          self.session = session          self.session = session
90            # Map object ids to the ids used in the thuban files
91            self.idmap = {}
92    
93        def get_id(self, obj):
94            """Return the id used in the thuban file for the object obj"""
95            return self.idmap.get(id(obj))
96    
97        def define_id(self, obj, value = None):
98            if value is None:
99                value = "D" + str(id(obj))
100            self.idmap[id(obj)] = value
101            return value
102    
103        def has_id(self, obj):
104            return self.idmap.has_key(id(obj))
105    
106      def write(self, file_or_filename):      def write(self, file_or_filename):
107          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
108    
109          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-0.9.dtd")
110          self.write_session(self.session)          self.write_session(self.session)
111          self.close()          self.close()
112    
# Line 82  class SessionSaver(XMLWriter): Line 131  class SessionSaver(XMLWriter):
131          attrs["title"] = session.title          attrs["title"] = session.title
132          for name, uri in namespaces:          for name, uri in namespaces:
133              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
134            # default name space
135            attrs["xmlns"] = \
136                   "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd"
137          self.open_element("session", attrs)          self.open_element("session", attrs)
138            self.write_db_connections(session)
139            self.write_data_containers(session)
140          for map in session.Maps():          for map in session.Maps():
141              self.write_map(map)              self.write_map(map)
142          self.close_element("session")          self.close_element("session")
143    
144        def write_db_connections(self, session):
145            for conn in session.DBConnections():
146                if isinstance(conn, PostGISConnection):
147                    self.write_element("dbconnection",
148                                       {"id": self.define_id(conn),
149                                        "dbtype": "postgis",
150                                        "host": conn.host,
151                                        "port": conn.port,
152                                        "user": conn.user,
153                                        "dbname": conn.dbname})
154                else:
155                    raise ValueError("Can't handle db connection %r" % conn)
156    
157        def write_data_containers(self, session):
158            containers = sort_data_stores(session.DataContainers())
159            for container in containers:
160                if isinstance(container, AutoTransientTable):
161                    # AutoTransientTable instances are invisible in the
162                    # thuban files. They're only used internally. To make
163                    # sure that containers depending on AutoTransientTable
164                    # instances refer to the right real containers we give
165                    # the AutoTransientTable instances the same id as the
166                    # source they depend on.
167                    self.define_id(container,
168                                   self.get_id(container.Dependencies()[0]))
169                    continue
170    
171                idvalue = self.define_id(container)
172                if isinstance(container, ShapefileStore):
173                    self.define_id(container.Table(), idvalue)
174                    filename = relative_filename(self.dir, container.FileName())
175                    self.write_element("fileshapesource",
176                                       {"id": idvalue, "filename": filename,
177                                        "filetype": "shapefile"})
178                elif isinstance(container, DerivedShapeStore):
179                    shapesource, table = container.Dependencies()
180                    self.write_element("derivedshapesource",
181                                       {"id": idvalue,
182                                        "shapesource": self.get_id(shapesource),
183                                        "table": self.get_id(table)})
184                elif isinstance(container, PostGISShapeStore):
185                    conn = container.DBConnection()
186                    self.write_element("dbshapesource",
187                                       {"id": idvalue,
188                                        "dbconn": self.get_id(conn),
189                                        "tablename": container.TableName()})
190                elif isinstance(container, DBFTable):
191                    filename = relative_filename(self.dir, container.FileName())
192                    self.write_element("filetable",
193                                       {"id": idvalue,
194                                        "title": container.Title(),
195                                        "filename": filename,
196                                        "filetype": "DBF"})
197                elif isinstance(container, TransientJoinedTable):
198                    left, right = container.Dependencies()
199                    left_field = container.left_field
200                    right_field = container.right_field
201                    self.write_element("jointable",
202                                       {"id": idvalue,
203                                        "title": container.Title(),
204                                        "right": self.get_id(right),
205                                        "rightcolumn": right_field,
206                                        "left": self.get_id(left),
207                                        "leftcolumn": left_field,
208                                        "jointype": container.JoinType()})
209                else:
210                    raise ValueError("Can't handle container %r" % container)
211    
212    
213      def write_map(self, map):      def write_map(self, map):
214          """Write the map and its contents.          """Write the map and its contents.
215    
# Line 127  class SessionSaver(XMLWriter): Line 250  class SessionSaver(XMLWriter):
250          attrs["visible"] = ("false", "true")[int(layer.Visible())]          attrs["visible"] = ("false", "true")[int(layer.Visible())]
251    
252          if isinstance(layer, Layer):          if isinstance(layer, Layer):
253              attrs["filename"] = relative_filename(self.dir,              attrs["shapestore"]   = self.get_id(layer.ShapeStore())
                                                 layer.ShapeStore().FileName())  
254    
255              lc = layer.GetClassification()              lc = layer.GetClassification()
256              attrs["stroke"]       = lc.GetDefaultLineColor().hex()              attrs["stroke"] = lc.GetDefaultLineColor().hex()
257              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
258              attrs["fill"]         = lc.GetDefaultFill().hex()              attrs["fill"] = lc.GetDefaultFill().hex()
259    
260              self.open_element("layer", attrs)              self.open_element("layer", attrs)
261              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
262              self.write_classification(layer)              self.write_classification(layer)
263              self.close_element("layer")              self.close_element("layer")
   
264          elif isinstance(layer, RasterLayer):          elif isinstance(layer, RasterLayer):
265              attrs["filename"] = relative_filename(self.dir, layer.filename)              attrs["filename"] = relative_filename(self.dir, layer.filename)
266              self.open_element("rasterlayer", attrs)              self.open_element("rasterlayer", attrs)
# Line 154  class SessionSaver(XMLWriter): Line 275  class SessionSaver(XMLWriter):
275    
276          lc = layer.GetClassification()          lc = layer.GetClassification()
277    
278          field = lc.GetField()          field = layer.GetClassificationColumn()
279    
280          #          #
281          # there isn't a classification of anything so do nothing          # there isn't a classification of anything so do nothing
282          #          #
283          if field is None: return          if field is None: return
284    
285          attrs["field"] = field          attrs["field"] = field
286          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
287          self.open_element("classification", attrs)          self.open_element("classification", attrs)
288    
289          for g in lc:          for g in lc:
290              if isinstance(g, ClassGroupDefault):              if isinstance(g, ClassGroupDefault):
291                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
292                  close_el = 'clnull'                  close_el = 'clnull'
293              elif isinstance(g, ClassGroupSingleton):              elif isinstance(g, ClassGroupSingleton):
294                    if layer.GetFieldType(field) == FIELDTYPE_STRING:
295                        value = self.encode(g.GetValue())
296                    else:
297                        value = str(g.GetValue())
298                  open_el  = 'clpoint label="%s" value="%s"' \                  open_el  = 'clpoint label="%s" value="%s"' \
299                             % (self.encode(g.GetLabel()), str(g.GetValue()))                             % (self.encode(g.GetLabel()), value)
300                  close_el = 'clpoint'                  close_el = 'clpoint'
301              elif isinstance(g, ClassGroupRange):              elif isinstance(g, ClassGroupRange):
302                  open_el  = 'clrange label="%s" range="%s"' \                  open_el  = 'clrange label="%s" range="%s"' \
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