/[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 2383 by jan, Thu Oct 7 14:19:48 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # $Id$
2    # Copyright (c) 2001-2004 by Intevation GmbH
3  # Authors:  # Authors:
4  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]> (2004)
5  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]> (2001-2004)
6  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]> (2003)
7    # Frank Koormann <[email protected]> (2003)
8  #  #
9  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
10  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 17  import os Line 19  import os
19    
20  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
21    
 from Thuban.Model.color import Color  
22  from Thuban.Model.layer import Layer, RasterLayer  from Thuban.Model.layer import Layer, RasterLayer
23    
24  from Thuban.Model.classification import \  from Thuban.Model.classification import \
25      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
26    from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
27    from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
28    from Thuban.Model.data import DerivedShapeStore, ShapefileStore, \
29                                  SHAPETYPE_POINT
30    
31  from Thuban.Model.xmlwriter import XMLWriter  from Thuban.Model.xmlwriter import XMLWriter
32    from postgisdb import PostGISConnection, PostGISShapeStore
33    
34  def relative_filename(dir, filename):  def relative_filename(dir, filename):
35      """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 43  def relative_filename(dir, filename):
43      else:      else:
44          return filename          return filename
45    
46    
47    def unify_filename(filename):
48        """Return a 'unified' version of filename
49    
50        The .thuban files should be as platform independent as possible.
51        Since they must contain filenames the filenames have to unified. We
52        unify on unix-like filenames for now, which means we do nothing on a
53        posix system and simply replace backslashes with slashes on windows
54        """
55        if os.name == "posix":
56            return filename
57        elif os.name == "nt":
58            return "/".join(filename.split("\\"))
59        else:
60            raise RuntimeError("Unsupported platform for unify_filename: %s"
61                               % os.name)
62    
63    def sort_data_stores(stores):
64        """Return a topologically sorted version of the sequence of data containers
65    
66        The list is sorted so that data containers that depend on other data
67        containers have higher indexes than the containers they depend on.
68        """
69        if not stores:
70            return []
71        processed = {}
72        result = []
73        todo = stores[:]
74        while todo:
75            # It doesn't really matter which if the items of todo is
76            # processed next, but if we take the first one, the order is
77            # preserved to some degree which makes writing some of the test
78            # cases easier.
79            container = todo.pop(0)
80            if id(container) in processed:
81                continue
82            deps = [dep for dep in container.Dependencies()
83                        if id(dep) not in processed]
84            if deps:
85                todo.append(container)
86                todo.extend(deps)
87            else:
88                result.append(container)
89                processed[id(container)] = 1
90        return result
91    
92    
93  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
94    
95      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 53  class SessionSaver(XMLWriter): Line 106  class SessionSaver(XMLWriter):
106      def __init__(self, session):      def __init__(self, session):
107          XMLWriter.__init__(self)          XMLWriter.__init__(self)
108          self.session = session          self.session = session
109            # Map object ids to the ids used in the thuban files
110            self.idmap = {}
111    
112        def get_id(self, obj):
113            """Return the id used in the thuban file for the object obj"""
114            return self.idmap.get(id(obj))
115    
116        def define_id(self, obj, value = None):
117            if value is None:
118                value = "D" + str(id(obj))
119            self.idmap[id(obj)] = value
120            return value
121    
122        def has_id(self, obj):
123            return self.idmap.has_key(id(obj))
124    
125        def prepare_filename(self, filename):
126            """Return the string to use when writing filename to the thuban file
127    
128            The returned string is a unified version (only slashes as
129            directory separators, see unify_filename) of filename expressed
130            relative to the directory the .thuban file is written to.
131            """
132            return unify_filename(relative_filename(self.dir, filename))
133    
134      def write(self, file_or_filename):      def write(self, file_or_filename):
135          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
136    
137          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-1.1.dtd")
138          self.write_session(self.session)          self.write_session(self.session)
139          self.close()          self.close()
140    
# Line 82  class SessionSaver(XMLWriter): Line 159  class SessionSaver(XMLWriter):
159          attrs["title"] = session.title          attrs["title"] = session.title
160          for name, uri in namespaces:          for name, uri in namespaces:
161              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
162            # default name space
163            attrs["xmlns"] = \
164                   "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
165          self.open_element("session", attrs)          self.open_element("session", attrs)
166            self.write_db_connections(session)
167            self.write_data_containers(session)
168          for map in session.Maps():          for map in session.Maps():
169              self.write_map(map)              self.write_map(map)
170          self.close_element("session")          self.close_element("session")
171    
172        def write_db_connections(self, session):
173            for conn in session.DBConnections():
174                if isinstance(conn, PostGISConnection):
175                    self.write_element("dbconnection",
176                                       {"id": self.define_id(conn),
177                                        "dbtype": "postgis",
178                                        "host": conn.host,
179                                        "port": conn.port,
180                                        "user": conn.user,
181                                        "dbname": conn.dbname})
182                else:
183                    raise ValueError("Can't handle db connection %r" % conn)
184    
185        def write_data_containers(self, session):
186            containers = sort_data_stores(session.DataContainers())
187            for container in containers:
188                if isinstance(container, AutoTransientTable):
189                    # AutoTransientTable instances are invisible in the
190                    # thuban files. They're only used internally. To make
191                    # sure that containers depending on AutoTransientTable
192                    # instances refer to the right real containers we give
193                    # the AutoTransientTable instances the same id as the
194                    # source they depend on.
195                    self.define_id(container,
196                                   self.get_id(container.Dependencies()[0]))
197                    continue
198    
199                idvalue = self.define_id(container)
200                if isinstance(container, ShapefileStore):
201                    self.define_id(container.Table(), idvalue)
202                    filename = self.prepare_filename(container.FileName())
203                    self.write_element("fileshapesource",
204                                       {"id": idvalue, "filename": filename,
205                                        "filetype": "shapefile"})
206                elif isinstance(container, DerivedShapeStore):
207                    shapesource, table = container.Dependencies()
208                    self.write_element("derivedshapesource",
209                                       {"id": idvalue,
210                                        "shapesource": self.get_id(shapesource),
211                                        "table": self.get_id(table)})
212                elif isinstance(container, PostGISShapeStore):
213                    conn = container.DBConnection()
214                    self.write_element("dbshapesource",
215                                       {"id": idvalue,
216                                        "dbconn": self.get_id(conn),
217                                        "tablename": container.TableName(),
218                                        "id_column": container.IDColumn().name,
219                                        "geometry_column":
220                                          container.GeometryColumn().name,
221                                        })
222                elif isinstance(container, DBFTable):
223                    filename = self.prepare_filename(container.FileName())
224                    self.write_element("filetable",
225                                       {"id": idvalue,
226                                        "title": container.Title(),
227                                        "filename": filename,
228                                        "filetype": "DBF"})
229                elif isinstance(container, TransientJoinedTable):
230                    left, right = container.Dependencies()
231                    left_field = container.left_field
232                    right_field = container.right_field
233                    self.write_element("jointable",
234                                       {"id": idvalue,
235                                        "title": container.Title(),
236                                        "right": self.get_id(right),
237                                        "rightcolumn": right_field,
238                                        "left": self.get_id(left),
239                                        "leftcolumn": left_field,
240                                        "jointype": container.JoinType()})
241                else:
242                    raise ValueError("Can't handle container %r" % container)
243    
244    
245      def write_map(self, map):      def write_map(self, map):
246          """Write the map and its contents.          """Write the map and its contents.
247    
# Line 106  class SessionSaver(XMLWriter): Line 261  class SessionSaver(XMLWriter):
261          """Write the projection.          """Write the projection.
262          """          """
263          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
264              self.open_element("projection", {"name": projection.GetName()})              attrs = {"name": projection.GetName()}
265                epsg = projection.EPSGCode()
266                if epsg is not None:
267                    attrs["epsg"] = epsg
268                self.open_element("projection", attrs)
269              for param in projection.params:              for param in projection.params:
270                  self.write_element('parameter value="%s"' %                  self.write_element('parameter value="%s"' %
271                                     self.encode(param))                                     self.encode(param))
# Line 127  class SessionSaver(XMLWriter): Line 286  class SessionSaver(XMLWriter):
286          attrs["visible"] = ("false", "true")[int(layer.Visible())]          attrs["visible"] = ("false", "true")[int(layer.Visible())]
287    
288          if isinstance(layer, Layer):          if isinstance(layer, Layer):
289              attrs["filename"] = relative_filename(self.dir,              attrs["shapestore"]   = self.get_id(layer.ShapeStore())
                                                 layer.ShapeStore().FileName())  
290    
291              lc = layer.GetClassification()              lc = layer.GetClassification()
292              attrs["stroke"]       = lc.GetDefaultLineColor().hex()              attrs["stroke"] = lc.GetDefaultLineColor().hex()
293              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
294              attrs["fill"]         = lc.GetDefaultFill().hex()              attrs["fill"] = lc.GetDefaultFill().hex()
295    
296              self.open_element("layer", attrs)              self.open_element("layer", attrs)
297              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
298              self.write_classification(layer)              self.write_classification(layer)
299              self.close_element("layer")              self.close_element("layer")
   
300          elif isinstance(layer, RasterLayer):          elif isinstance(layer, RasterLayer):
301              attrs["filename"] = relative_filename(self.dir, layer.filename)              attrs["filename"] = self.prepare_filename(layer.filename)
302              self.open_element("rasterlayer", attrs)              self.open_element("rasterlayer", attrs)
303              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
304              self.close_element("rasterlayer")              self.close_element("rasterlayer")
# Line 154  class SessionSaver(XMLWriter): Line 311  class SessionSaver(XMLWriter):
311    
312          lc = layer.GetClassification()          lc = layer.GetClassification()
313    
314          field = lc.GetField()          field = layer.GetClassificationColumn()
315    
316          #          #
317          # there isn't a classification of anything so do nothing          # there isn't a classification of anything so do nothing
318          #          #
319          if field is None: return          if field is None: return
320    
321          attrs["field"] = field          attrs["field"] = field
322          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
323          self.open_element("classification", attrs)          self.open_element("classification", attrs)
324    
325          for g in lc:          for g in lc:
326              if isinstance(g, ClassGroupDefault):              if isinstance(g, ClassGroupDefault):
327                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
328                  close_el = 'clnull'                  close_el = 'clnull'
329              elif isinstance(g, ClassGroupSingleton):              elif isinstance(g, ClassGroupSingleton):
330                    if layer.GetFieldType(field) == FIELDTYPE_STRING:
331                        value = self.encode(g.GetValue())
332                    else:
333                        value = str(g.GetValue())
334                  open_el  = 'clpoint label="%s" value="%s"' \                  open_el  = 'clpoint label="%s" value="%s"' \
335                             % (self.encode(g.GetLabel()), str(g.GetValue()))                             % (self.encode(g.GetLabel()), value)
336                  close_el = 'clpoint'                  close_el = 'clpoint'
337              elif isinstance(g, ClassGroupRange):              elif isinstance(g, ClassGroupRange):
338                  open_el  = 'clrange label="%s" range="%s"' \                  open_el  = 'clrange label="%s" range="%s"' \
# Line 186  class SessionSaver(XMLWriter): Line 347  class SessionSaver(XMLWriter):
347                      'stroke_width': str(data.GetLineWidth()),                      'stroke_width': str(data.GetLineWidth()),
348                      'fill'        : data.GetFill().hex()}                      'fill'        : data.GetFill().hex()}
349    
350                # only for point layers write the size attribute
351                if layer.ShapeType() == SHAPETYPE_POINT:
352                    dict['size'] =  str(data.GetSize())
353    
354              self.open_element(open_el)              self.open_element(open_el)
355              self.write_element("cldata", dict)              self.write_element("cldata", dict)
356              self.close_element(close_el)              self.close_element(close_el)
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