/[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 1375 by bh, Tue Jul 8 10:53:05 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
26    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
27    
28  from Thuban.Model.xmlwriter import XMLWriter  from Thuban.Model.xmlwriter import XMLWriter
29    
# Line 37  def relative_filename(dir, filename): Line 39  def relative_filename(dir, filename):
39      else:      else:
40          return filename          return filename
41    
42    
43    def sort_data_stores(stores):
44        """Return a topologically sorted version of the sequence of data containers
45    
46        The list is sorted so that data containers that depend on other data
47        containers have higher indexes than the containers they depend on.
48        """
49        if not stores:
50            return []
51        processed = {}
52        result = []
53        todo = stores[:]
54        while todo:
55            # It doesn't really matter which if the items of todo is
56            # processed next, but if we take the first one, the order is
57            # preserved to some degree which makes writing some of the test
58            # cases easier.
59            container = todo.pop(0)
60            if id(container) in processed:
61                continue
62            deps = [dep for dep in container.Dependencies()
63                        if id(dep) not in processed]
64            if deps:
65                todo.append(container)
66                todo.extend(deps)
67            else:
68                result.append(container)
69                processed[id(container)] = 1
70        return result
71    
72    
73  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
74    
75      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 53  class SessionSaver(XMLWriter): Line 86  class SessionSaver(XMLWriter):
86      def __init__(self, session):      def __init__(self, session):
87          XMLWriter.__init__(self)          XMLWriter.__init__(self)
88          self.session = session          self.session = session
89            # Map object ids to the ids used in the thuban files
90            self.idmap = {}
91    
92        def get_id(self, obj):
93            """Return the id used in the thuban file for the object obj"""
94            return self.idmap.get(id(obj))
95    
96        def define_id(self, obj, value = None):
97            if value is None:
98                value = "D" + str(id(obj))
99            self.idmap[id(obj)] = value
100            return value
101    
102        def has_id(self, obj):
103            return self.idmap.has_key(id(obj))
104    
105      def write(self, file_or_filename):      def write(self, file_or_filename):
106          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
107    
108          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-0.9.dtd")
109          self.write_session(self.session)          self.write_session(self.session)
110          self.close()          self.close()
111    
# Line 82  class SessionSaver(XMLWriter): Line 130  class SessionSaver(XMLWriter):
130          attrs["title"] = session.title          attrs["title"] = session.title
131          for name, uri in namespaces:          for name, uri in namespaces:
132              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
133            # default name space
134            attrs["xmlns"] = \
135                   "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd"
136          self.open_element("session", attrs)          self.open_element("session", attrs)
137            self.write_data_containers(session)
138          for map in session.Maps():          for map in session.Maps():
139              self.write_map(map)              self.write_map(map)
140          self.close_element("session")          self.close_element("session")
141    
142        def write_data_containers(self, session):
143            containers = sort_data_stores(session.DataContainers())
144            for container in containers:
145                if isinstance(container, AutoTransientTable):
146                    # AutoTransientTable instances are invisible in the
147                    # thuban files. They're only used internally. To make
148                    # sure that containers depending on AutoTransientTable
149                    # instances refer to the right real containers we give
150                    # the AutoTransientTable instances the same id as the
151                    # source they depend on.
152                    self.define_id(container,
153                                   self.get_id(container.Dependencies()[0]))
154                    continue
155    
156                idvalue = self.define_id(container)
157                if isinstance(container, ShapefileStore):
158                    self.define_id(container.Table(), idvalue)
159                    filename = relative_filename(self.dir, container.FileName())
160                    self.write_element("fileshapesource",
161                                       {"id": idvalue, "filename": filename,
162                                        "filetype": "shapefile"})
163                elif isinstance(container, DerivedShapeStore):
164                    shapesource, table = container.Dependencies()
165                    self.write_element("derivedshapesource",
166                                       {"id": idvalue,
167                                        "shapesource": self.get_id(shapesource),
168                                        "table": self.get_id(table)})
169                elif isinstance(container, DBFTable):
170                    filename = relative_filename(self.dir, container.FileName())
171                    self.write_element("filetable",
172                                       {"id": idvalue,
173                                        "title": container.Title(),
174                                        "filename": filename,
175                                        "filetype": "DBF"})
176                elif isinstance(container, TransientJoinedTable):
177                    left, right = container.Dependencies()
178                    left_field = container.left_field
179                    right_field = container.right_field
180                    self.write_element("jointable",
181                                       {"id": idvalue,
182                                        "title": container.Title(),
183                                        "right": self.get_id(right),
184                                        "rightcolumn": right_field,
185                                        "left": self.get_id(left),
186                                        "leftcolumn": left_field,
187                                        "jointype": container.JoinType()})
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 127  class SessionSaver(XMLWriter): Line 229  class SessionSaver(XMLWriter):
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)
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