/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 1219 by bh, Mon Jun 16 17:42:54 2003 UTC revision 1268 by bh, Fri Jun 20 16:10:12 2003 UTC
# Line 22  from Thuban.Model.layer import Layer, Ra Line 22  from Thuban.Model.layer import Layer, Ra
22    
23  from Thuban.Model.classification import \  from Thuban.Model.classification import \
24      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
25    from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
26    from Thuban.Model.table import DBFTable
27    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
28    
29  from Thuban.Model.xmlwriter import XMLWriter  from Thuban.Model.xmlwriter import XMLWriter
30    
# 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-0.8.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-0.8.dtd"
137          self.open_element("session", attrs)          self.open_element("session", attrs)
138            self.write_data_containers(session)
139          for map in session.Maps():          for map in session.Maps():
140              self.write_map(map)              self.write_map(map)
141          self.close_element("session")          self.close_element("session")
142    
143        def write_data_containers(self, session):
144            containers = sort_data_stores(session.DataContainers())
145            for container in containers:
146                if isinstance(container, AutoTransientTable):
147                    # AutoTransientTable instances are invisible in the
148                    # thuban files. They're only used internally. To make
149                    # sure that containers depending on AutoTransientTable
150                    # instances refer to the right real containers we give
151                    # the AutoTransientTable instances the same id as the
152                    # source they depend on.
153                    self.define_id(container,
154                                   self.get_id(container.Dependencies()[0]))
155                    continue
156    
157                idvalue = self.define_id(container)
158                if isinstance(container, ShapefileStore):
159                    self.define_id(container.Table(), idvalue)
160                    filename = relative_filename(self.dir, container.FileName())
161                    self.write_element("fileshapesource",
162                                       {"id": idvalue, "filename": filename,
163                                        "filetype": "shapefile"})
164                elif isinstance(container, DerivedShapeStore):
165                    shapesource, table = container.Dependencies()
166                    self.write_element("derivedshapesource",
167                                       {"id": idvalue,
168                                        "shapesource": self.get_id(shapesource),
169                                        "table": self.get_id(table)})
170                elif isinstance(container, DBFTable):
171                    filename = relative_filename(self.dir, container.FileName())
172                    self.write_element("filetable",
173                                       {"id": idvalue,
174                                        "title": container.Title(),
175                                        "filename": filename,
176                                        "filetype": "DBF"})
177                elif isinstance(container, TransientJoinedTable):
178                    left, right = container.Dependencies()
179                    left_field = container.left_field
180                    right_field = container.right_field
181                    self.write_element("jointable",
182                                       {"id": idvalue,
183                                        "title": container.Title(),
184                                        "right": self.get_id(right),
185                                        "rightcolumn": right_field,
186                                        "left": self.get_id(left),
187                                        "leftcolumn": left_field})
188                else:
189                    raise ValueError("Can't handle container %r" % container)
190    
191    
192      def write_map(self, map):      def write_map(self, map):
193          """Write the map and its contents.          """Write the map and its contents.
194    
# Line 123  class SessionSaver(XMLWriter): Line 225  class SessionSaver(XMLWriter):
225          if attrs is None:          if attrs is None:
226              attrs = {}              attrs = {}
227    
228          attrs["title"]        = layer.title          attrs["title"]   = layer.title
229          attrs["visible"]      = ("false", "true")[int(layer.Visible())]          attrs["visible"] = ("false", "true")[int(layer.Visible())]
230    
231          if isinstance(layer, Layer):          if isinstance(layer, Layer):
232              attrs["filename"] = relative_filename(self.dir,              attrs["shapestore"]   = self.get_id(layer.ShapeStore())
                                                 layer.ShapeStore().FileName())  
233    
234              lc = layer.GetClassification()              lc = layer.GetClassification()
235              attrs["stroke"]       = lc.GetDefaultLineColor().hex()              attrs["stroke"] = lc.GetDefaultLineColor().hex()
236              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
237              attrs["fill"]         = lc.GetDefaultFill().hex()              attrs["fill"] = lc.GetDefaultFill().hex()
238    
239              self.open_element("layer", attrs)              self.open_element("layer", attrs)
240              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
241              self.write_classification(layer)              self.write_classification(layer)
242              self.close_element("layer")              self.close_element("layer")
   
243          elif isinstance(layer, RasterLayer):          elif isinstance(layer, RasterLayer):
244              attrs["filename"] = relative_filename(self.dir, layer.filename)              attrs["filename"] = relative_filename(self.dir, layer.filename)
245              self.open_element("rasterlayer", attrs)              self.open_element("rasterlayer", attrs)
# Line 147  class SessionSaver(XMLWriter): Line 247  class SessionSaver(XMLWriter):
247              self.close_element("rasterlayer")              self.close_element("rasterlayer")
248    
249      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
250            """Write Classification information."""
251    
252          if attrs is None:          if attrs is None:
253              attrs = {}              attrs = {}
254    
# Line 155  class SessionSaver(XMLWriter): Line 257  class SessionSaver(XMLWriter):
257          field = lc.GetField()          field = lc.GetField()
258    
259          #          #
260          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
261          #          #
262          if field is None: return          if field is None: return
263    
# Line 164  class SessionSaver(XMLWriter): Line 265  class SessionSaver(XMLWriter):
265          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(lc.GetFieldType())
266          self.open_element("classification", attrs)          self.open_element("classification", attrs)
267    
268            for g in lc:
269          types = [[lambda p: 'clnull label="%s"' % self.encode(p.GetLabel()),              if isinstance(g, ClassGroupDefault):
270                    lambda p: 'clnull'],                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
271                   [lambda p: 'clpoint label="%s" value="%s"' %                  close_el = 'clnull'
272                               (self.encode(p.GetLabel()), str(p.GetValue())),              elif isinstance(g, ClassGroupSingleton):
273                    lambda p: 'clpoint'],                  open_el  = 'clpoint label="%s" value="%s"' \
274                   [lambda p: 'clrange label="%s" range="%s"' %                             % (self.encode(g.GetLabel()), str(g.GetValue()))
275                               (self.encode(p.GetLabel()),                  close_el = 'clpoint'
276                                str(p.GetRange())),              elif isinstance(g, ClassGroupRange):
277                    lambda p: 'clrange']]                  open_el  = 'clrange label="%s" range="%s"' \
278                              % (self.encode(g.GetLabel()), str(g.GetRange()))
279          def write_class_group(group):                  close_el = 'clrange'
280              type = -1              else:
281              if isinstance(group, ClassGroupDefault): type = 0                  assert False, _("Unsupported group type in classification")
282              elif isinstance(group, ClassGroupSingleton): type = 1                  continue
283              elif isinstance(group, ClassGroupRange): type = 2  
284              elif isinstance(group, ClassGroupMap):   type = 3              data = g.GetProperties()
285              assert type >= 0              dict = {'stroke'      : data.GetLineColor().hex(),
286                        'stroke_width': str(data.GetLineWidth()),
287              if type <= 2:                      'fill'        : data.GetFill().hex()}
288                  data = group.GetProperties()  
289                  dict = {'stroke'      : data.GetLineColor().hex(),              self.open_element(open_el)
290                          'stroke_width': str(data.GetLineWidth()),              self.write_element("cldata", dict)
291                          'fill'        : data.GetFill().hex()}              self.close_element(close_el)
   
                 self.open_element(types[type][0](group))  
                 self.write_element("cldata", dict)  
                 self.close_element(types[type][1](group))  
             else: pass # XXX: we need to handle maps  
   
         for i in lc:  
             write_class_group(i)  
292    
293          self.close_element("classification")          self.close_element("classification")
294    
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