/[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 2036 by bh, Mon Dec 22 17:49:43 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 unify_filename(filename):
45        """Return a 'unified' version of filename
46    
47        The .thuban files should be as platform independent as possible.
48        Since they must contain filenames the filenames have to unified. We
49        unify on unix-like filenames for now, which means we do nothing on a
50        posix system and simply replace backslashes with slashes on windows
51        """
52        if os.name == "posix":
53            return filename
54        elif os.name == "nt":
55            return "/".join(filename.split("\\"))
56        else:
57            raise RuntimeError("Unsupported platform for unify_filename: %s"
58                               % os.name)
59    
60    def sort_data_stores(stores):
61        """Return a topologically sorted version of the sequence of data containers
62    
63        The list is sorted so that data containers that depend on other data
64        containers have higher indexes than the containers they depend on.
65        """
66        if not stores:
67            return []
68        processed = {}
69        result = []
70        todo = stores[:]
71        while todo:
72            # It doesn't really matter which if the items of todo is
73            # processed next, but if we take the first one, the order is
74            # preserved to some degree which makes writing some of the test
75            # cases easier.
76            container = todo.pop(0)
77            if id(container) in processed:
78                continue
79            deps = [dep for dep in container.Dependencies()
80                        if id(dep) not in processed]
81            if deps:
82                todo.append(container)
83                todo.extend(deps)
84            else:
85                result.append(container)
86                processed[id(container)] = 1
87        return result
88    
89    
90  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
91    
92      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 53  class SessionSaver(XMLWriter): Line 103  class SessionSaver(XMLWriter):
103      def __init__(self, session):      def __init__(self, session):
104          XMLWriter.__init__(self)          XMLWriter.__init__(self)
105          self.session = session          self.session = session
106            # Map object ids to the ids used in the thuban files
107            self.idmap = {}
108    
109        def get_id(self, obj):
110            """Return the id used in the thuban file for the object obj"""
111            return self.idmap.get(id(obj))
112    
113        def define_id(self, obj, value = None):
114            if value is None:
115                value = "D" + str(id(obj))
116            self.idmap[id(obj)] = value
117            return value
118    
119        def has_id(self, obj):
120            return self.idmap.has_key(id(obj))
121    
122        def prepare_filename(self, filename):
123            """Return the string to use when writing filename to the thuban file
124    
125            The returned string is a unified version (only slashes as
126            directory separators, see unify_filename) of filename expressed
127            relative to the directory the .thuban file is written to.
128            """
129            return unify_filename(relative_filename(self.dir, filename))
130    
131      def write(self, file_or_filename):      def write(self, file_or_filename):
132          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
133    
134          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-1.0.dtd")
135          self.write_session(self.session)          self.write_session(self.session)
136          self.close()          self.close()
137    
# Line 82  class SessionSaver(XMLWriter): Line 156  class SessionSaver(XMLWriter):
156          attrs["title"] = session.title          attrs["title"] = session.title
157          for name, uri in namespaces:          for name, uri in namespaces:
158              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
159            # default name space
160            attrs["xmlns"] = \
161                   "http://thuban.intevation.org/dtds/thuban-1.0.0.dtd"
162          self.open_element("session", attrs)          self.open_element("session", attrs)
163            self.write_db_connections(session)
164            self.write_data_containers(session)
165          for map in session.Maps():          for map in session.Maps():
166              self.write_map(map)              self.write_map(map)
167          self.close_element("session")          self.close_element("session")
168    
169        def write_db_connections(self, session):
170            for conn in session.DBConnections():
171                if isinstance(conn, PostGISConnection):
172                    self.write_element("dbconnection",
173                                       {"id": self.define_id(conn),
174                                        "dbtype": "postgis",
175                                        "host": conn.host,
176                                        "port": conn.port,
177                                        "user": conn.user,
178                                        "dbname": conn.dbname})
179                else:
180                    raise ValueError("Can't handle db connection %r" % conn)
181    
182        def write_data_containers(self, session):
183            containers = sort_data_stores(session.DataContainers())
184            for container in containers:
185                if isinstance(container, AutoTransientTable):
186                    # AutoTransientTable instances are invisible in the
187                    # thuban files. They're only used internally. To make
188                    # sure that containers depending on AutoTransientTable
189                    # instances refer to the right real containers we give
190                    # the AutoTransientTable instances the same id as the
191                    # source they depend on.
192                    self.define_id(container,
193                                   self.get_id(container.Dependencies()[0]))
194                    continue
195    
196                idvalue = self.define_id(container)
197                if isinstance(container, ShapefileStore):
198                    self.define_id(container.Table(), idvalue)
199                    filename = self.prepare_filename(container.FileName())
200                    self.write_element("fileshapesource",
201                                       {"id": idvalue, "filename": filename,
202                                        "filetype": "shapefile"})
203                elif isinstance(container, DerivedShapeStore):
204                    shapesource, table = container.Dependencies()
205                    self.write_element("derivedshapesource",
206                                       {"id": idvalue,
207                                        "shapesource": self.get_id(shapesource),
208                                        "table": self.get_id(table)})
209                elif isinstance(container, PostGISShapeStore):
210                    conn = container.DBConnection()
211                    self.write_element("dbshapesource",
212                                       {"id": idvalue,
213                                        "dbconn": self.get_id(conn),
214                                        "tablename": container.TableName()})
215                elif isinstance(container, DBFTable):
216                    filename = self.prepare_filename(container.FileName())
217                    self.write_element("filetable",
218                                       {"id": idvalue,
219                                        "title": container.Title(),
220                                        "filename": filename,
221                                        "filetype": "DBF"})
222                elif isinstance(container, TransientJoinedTable):
223                    left, right = container.Dependencies()
224                    left_field = container.left_field
225                    right_field = container.right_field
226                    self.write_element("jointable",
227                                       {"id": idvalue,
228                                        "title": container.Title(),
229                                        "right": self.get_id(right),
230                                        "rightcolumn": right_field,
231                                        "left": self.get_id(left),
232                                        "leftcolumn": left_field,
233                                        "jointype": container.JoinType()})
234                else:
235                    raise ValueError("Can't handle container %r" % container)
236    
237    
238      def write_map(self, map):      def write_map(self, map):
239          """Write the map and its contents.          """Write the map and its contents.
240    
# Line 106  class SessionSaver(XMLWriter): Line 254  class SessionSaver(XMLWriter):
254          """Write the projection.          """Write the projection.
255          """          """
256          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
257              self.open_element("projection", {"name": projection.GetName()})              attrs = {"name": projection.GetName()}
258                epsg = projection.EPSGCode()
259                if epsg is not None:
260                    attrs["epsg"] = epsg
261                self.open_element("projection", attrs)
262              for param in projection.params:              for param in projection.params:
263                  self.write_element('parameter value="%s"' %                  self.write_element('parameter value="%s"' %
264                                     self.encode(param))                                     self.encode(param))
# Line 127  class SessionSaver(XMLWriter): Line 279  class SessionSaver(XMLWriter):
279          attrs["visible"] = ("false", "true")[int(layer.Visible())]          attrs["visible"] = ("false", "true")[int(layer.Visible())]
280    
281          if isinstance(layer, Layer):          if isinstance(layer, Layer):
282              attrs["filename"] = relative_filename(self.dir,              attrs["shapestore"]   = self.get_id(layer.ShapeStore())
                                                 layer.ShapeStore().FileName())  
283    
284              lc = layer.GetClassification()              lc = layer.GetClassification()
285              attrs["stroke"]       = lc.GetDefaultLineColor().hex()              attrs["stroke"] = lc.GetDefaultLineColor().hex()
286              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
287              attrs["fill"]         = lc.GetDefaultFill().hex()              attrs["fill"] = lc.GetDefaultFill().hex()
288    
289              self.open_element("layer", attrs)              self.open_element("layer", attrs)
290              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
291              self.write_classification(layer)              self.write_classification(layer)
292              self.close_element("layer")              self.close_element("layer")
   
293          elif isinstance(layer, RasterLayer):          elif isinstance(layer, RasterLayer):
294              attrs["filename"] = relative_filename(self.dir, layer.filename)              attrs["filename"] = self.prepare_filename(layer.filename)
295              self.open_element("rasterlayer", attrs)              self.open_element("rasterlayer", attrs)
296              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
297              self.close_element("rasterlayer")              self.close_element("rasterlayer")
# Line 154  class SessionSaver(XMLWriter): Line 304  class SessionSaver(XMLWriter):
304    
305          lc = layer.GetClassification()          lc = layer.GetClassification()
306    
307          field = lc.GetField()          field = layer.GetClassificationColumn()
308    
309          #          #
310          # there isn't a classification of anything so do nothing          # there isn't a classification of anything so do nothing
311          #          #
312          if field is None: return          if field is None: return
313    
314          attrs["field"] = field          attrs["field"] = field
315          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
316          self.open_element("classification", attrs)          self.open_element("classification", attrs)
317    
318          for g in lc:          for g in lc:
319              if isinstance(g, ClassGroupDefault):              if isinstance(g, ClassGroupDefault):
320                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
321                  close_el = 'clnull'                  close_el = 'clnull'
322              elif isinstance(g, ClassGroupSingleton):              elif isinstance(g, ClassGroupSingleton):
323                    if layer.GetFieldType(field) == FIELDTYPE_STRING:
324                        value = self.encode(g.GetValue())
325                    else:
326                        value = str(g.GetValue())
327                  open_el  = 'clpoint label="%s" value="%s"' \                  open_el  = 'clpoint label="%s" value="%s"' \
328                             % (self.encode(g.GetLabel()), str(g.GetValue()))                             % (self.encode(g.GetLabel()), value)
329                  close_el = 'clpoint'                  close_el = 'clpoint'
330              elif isinstance(g, ClassGroupRange):              elif isinstance(g, ClassGroupRange):
331                  open_el  = 'clrange label="%s" range="%s"' \                  open_el  = 'clrange label="%s" range="%s"' \
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