/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 737 by jonathan, Fri Apr 25 09:12:17 2003 UTC revision 2004 by bh, Tue Dec 2 13:25:55 2003 UTC
# Line 20  import xml.sax.handler Line 20  import xml.sax.handler
20  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21    
22  from Thuban import _  from Thuban import _
 from Thuban.common import *  
23    
24  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
25       FIELDTYPE_STRING       FIELDTYPE_STRING
26    
27    from Thuban.Model.color import Color, Transparent
28    
29  from Thuban.Model.session import Session  from Thuban.Model.session import Session
30  from Thuban.Model.map import Map  from Thuban.Model.map import Map
31  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer, RasterLayer
 from Thuban.Model.color import Color  
32  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
33    from Thuban.Model.range import Range
34  from Thuban.Model.classification import Classification, \  from Thuban.Model.classification import Classification, \
35      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
36      ClassGroupProperties      ClassGroupProperties
37    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
38    from Thuban.Model.table import DBFTable
39    from Thuban.Model.transientdb import TransientJoinedTable
40    
41    from Thuban.Model.xmlreader import XMLReader
42    import resource
43    
44    import postgisdb
45    
46    class LoadError(Exception):
47    
48        """Exception raised when the thuban file is corrupted
49    
50        Not all cases of corrupted thuban files will lead to this exception
51        but those that are found by checks in the loading code itself are.
52        """
53    
54    
55    class LoadCancelled(Exception):
56    
57        """Exception raised to indicate that loading was interrupted by the user"""
58    
59    
60  def parse_color(color):  def parse_color(color):
# Line 43  def parse_color(color): Line 65  def parse_color(color):
65      """      """
66      color = string.strip(color)      color = string.strip(color)
67      if color == "None":      if color == "None":
68          result = Color.Transparent          result = Transparent
69      elif color[0] == '#':      elif color[0] == '#':
70          if len(color) == 7:          if len(color) == 7:
71              r = string.atoi(color[1:3], 16) / 255.0              r = string.atoi(color[1:3], 16) / 255.0
# Line 57  def parse_color(color): Line 79  def parse_color(color):
79          raise ValueError(_("Invalid color specification %s") % color)          raise ValueError(_("Invalid color specification %s") % color)
80      return result      return result
81    
82    class AttrDesc:
83    
84  class XMLReader(xml.sax.handler.ContentHandler):      def __init__(self, name, required = False, default = "",
85                     conversion = None):
86      # Dictionary mapping element names (or (URI, element name) pairs for          if not isinstance(name, tuple):
87      # documents using namespaces) to method names. The methods should              fullname = (None, name)
     # accept the same parameters as the startElement (or startElementNS)  
     # methods. The start_dispatcher is used by the default startElement  
     # and startElementNS methods to call a method for the open tag of an  
     # element.  
     start_dispatcher = {}  
   
     # end_dispatcher works just like start_dispatcher but it's used by  
     # endElement and endElementNS. The method whose names it maps to  
     # should accept the same parameters as endElement and endElementNS.  
     end_dispatcher = {}  
   
   
     def __init__(self):  
         self.chars = ''  
         self.__parser = None  
         self.__directory = ""  
         self.__dispatchers = {}  
   
     def read(self, file_or_filename):  
   
         if hasattr(file_or_filename, "read"):  
             # it's a file object  
             self.__directory = ""  
             self.__file = file_or_filename  
88          else:          else:
89              filename = file_or_filename              fullname = name
90              self.__directory = os.path.dirname(filename)              name = name[1]
91              self.__file = open(filename)          self.name = name
92            self.fullname = fullname
93          if self.__parser is None:          self.required = required
94              self.__parser = make_parser()          self.default = default
95              self.__parser.setContentHandler(self)          self.conversion = conversion
             self.__parser.setErrorHandler(ErrorHandler())  
             self.__parser.setFeature(xml.sax.handler.feature_namespaces, 1)  
   
             #  
             # Well, this isn't pretty, but it appears that if you  
             # use Python 2.2 without the site-package _xmlplus then  
             # the following will fail, and without them it will work.  
             # However, if you do have the site-package and you don't  
             # call these functions, the reader raises an exception  
             #  
             # The reason we set these to 0 in the first place is  
             # because there is an unresolved issue with external  
             # entities causing an exception in the reader  
             #  
             try:  
                 self.__parser.setFeature(xml.sax.handler.feature_validation,0)  
                 self.__parser.setFeature(xml.sax.handler.feature_external_ges,0)  
                 self.__parser.setFeature(xml.sax.handler.feature_external_pes,0)  
             except SAXNotRecognizedException:  
                 pass  
   
         self.__parser.parse(self.__file)  
   
         self.close()  
   
     def close(self):  
         self.__file.close()  
           
     def GetFilename(self):  
         if hasattr(self.__file, "name"):  
             return self.__file.name  
   
         return ""  
   
     def GetDirectory(self):  
         return self.__directory  
   
   
     def AddDispatchers(self, dict):  
         """Add the function names that should be used to process XML tags.  
   
         dict -- a dictionary whose keys are XML tag strings and whose values  
                 are pairs of strings such that the first string is  
                 the name of the function that should be called when the  
                 XML tag opens and the second string is the name of the  
                 function that should be called when the XML tag closes.  
                 If a pair element is None, no function is called.  
         """  
96    
97          self.__dispatchers.update(dict)          # set by the SessionLoader's check_attrs method
98            self.value = None
99    
     def startElementNS(self, name, qname, attrs):  
         """Call the method given for name in self.start_dispatcher  
         """  
         if name[0] is None:  
             method_name = self.__dispatchers.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.__dispatchers.get(name)  
         if method_name is not None and method_name[0] is not None:  
             getattr(self, method_name[0])(name, qname, attrs)  
   
     def endElementNS(self, name, qname):  
         """Call the method given for name in self.end_dispatcher  
         """  
         if name[0] is None:  
             method_name = self.__dispatchers.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.__dispatchers.get(name)  
         if method_name is not None and method_name[1] is not None:  
             getattr(self, method_name[1])(name, qname)  
100    
101  class SessionLoader(XMLReader):  class SessionLoader(XMLReader):
102    
103      def __init__(self):      def __init__(self, db_connection_callback = None):
104          """Inititialize the Sax handler."""          """Inititialize the Sax handler."""
105          XMLReader.__init__(self)          XMLReader.__init__(self)
106    
107            self.db_connection_callback = db_connection_callback
108    
109          self.theSession = None          self.theSession = None
110          self.aMap = None          self.aMap = None
111          self.aLayer = None          self.aLayer = None
112    
113          XMLReader.AddDispatchers(self,          # Map ids used in the thuban file to the corresponding objects
114              {'session'       : ("start_session",        "end_session"),          # in the session
115               'map'           : ("start_map",            "end_map"),          self.idmap = {}
116               'projection'    : ("start_projection",     "end_projection"),  
117               'parameter'     : ("start_parameter",      None),          dispatchers = {
118               'layer'         : ("start_layer",          "end_layer"),              'session'       : ("start_session",        "end_session"),
119               'classification': ("start_classification", "end_classification"),  
120               'clnull'        : ("start_clnull",         "end_clnull"),              'dbconnection': ("start_dbconnection", None),
121               'clpoint'       : ("start_clpoint",        "end_clpoint"),  
122               'clrange'       : ("start_clrange",        "end_clrange"),              'dbshapesource': ("start_dbshapesource", None),
123               'cldata'        : ("start_cldata",         "end_cldata"),              'fileshapesource': ("start_fileshapesource", None),
124               'table'         : ("start_table",          "end_table"),              'derivedshapesource': ("start_derivedshapesource", None),
125               'labellayer'    : ("start_labellayer",     None),              'filetable': ("start_filetable", None),
126               'label'         : ("start_label",          None)})              'jointable': ("start_jointable", None),
127    
128                'map'           : ("start_map",            "end_map"),
129                'projection'    : ("start_projection",     "end_projection"),
130                'parameter'     : ("start_parameter",      None),
131                'layer'         : ("start_layer",          "end_layer"),
132                'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
133                'classification': ("start_classification", "end_classification"),
134                'clnull'        : ("start_clnull",         "end_clnull"),
135                'clpoint'       : ("start_clpoint",        "end_clpoint"),
136                'clrange'       : ("start_clrange",        "end_clrange"),
137                'cldata'        : ("start_cldata",         "end_cldata"),
138                'table'         : ("start_table",          "end_table"),
139                'labellayer'    : ("start_labellayer",     None),
140                'label'         : ("start_label",          None)}
141    
142            # all dispatchers should be used for the 0.8 and 0.9 namespaces too
143            for xmlns in ("http://thuban.intevation.org/dtds/thuban-0.8.dtd",
144                          "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd",
145                          "http://thuban.intevation.org/dtds/thuban-0.9.dtd",
146                          "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd",
147                          "http://thuban.intevation.org/dtds/thuban-1.0rc1.dtd"):
148                for key, value in dispatchers.items():
149                    dispatchers[(xmlns, key)] = value
150    
151            XMLReader.AddDispatchers(self, dispatchers)
152    
153        def Destroy(self):
154            """Clear all instance variables to cut cyclic references.
155    
156            The GC would have collected the loader eventually but it can
157            happen that it doesn't run at all until Thuban is closed (2.3
158            but not 2.2 tries a bit harder and forces a collection when the
159            interpreter terminates)
160            """
161            self.__dict__.clear()
162    
163      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
164          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'),
165                                                            None)))
166    
167      def end_session(self, name, qname):      def end_session(self, name, qname):
168          pass          pass
169    
170        def check_attrs(self, element, attrs, descr):
171            """Check and convert some of the attributes of an element
172    
173            Parameters:
174               element -- The element name
175               attrs -- The attrs mapping as passed to the start_* methods
176               descr -- Sequence of attribute descriptions (AttrDesc instances)
177    
178            Return a dictionary containig normalized versions of the
179            attributes described in descr. The keys of that dictionary are
180            the name attributes of the attribute descriptions. The attrs
181            dictionary will not be modified.
182    
183            If the attribute is required, i.e. the 'required' attribute of
184            the descrtiption is true, but it is not in attrs, raise a
185            LoadError.
186    
187            If the attribute has a default value and it is not present in
188            attrs, use that default value as the value in the returned dict.
189    
190            The value is converted before putting it into the returned dict.
191            The following conversions are available:
192    
193               'filename' -- The attribute is a filename.
194    
195                             If the filename is a relative name, interpret
196                             it relative to the directory containing the
197                             .thuban file and make it an absolute name
198    
199               'shapestore' -- The attribute is the ID of a shapestore
200                               defined earlier in the .thuban file. Look it
201                               up self.idmap
202    
203               'table' -- The attribute is the ID of a table or shapestore
204                          defined earlier in the .thuban file. Look it up
205                          self.idmap. If it's the ID of a shapestore the
206                          value will be the table of the shapestore.
207    
208               'idref' -- The attribute is the id of an object defined
209                          earlier in the .thuban file. Look it up self.idmap
210    
211               'ascii' -- The attribute is converted to a bytestring with
212                          ascii encoding.
213    
214               a callable -- The attribute value is passed to the callable
215                             and the return value is used as the converted
216                             value
217    
218            If no conversion is specified for an attribute it is converted
219            with self.encode.
220            """
221            normalized = {}
222    
223            for d in descr:
224                if d.required and not attrs.has_key(d.fullname):
225                    raise LoadError("Element %s requires an attribute %r"
226                                    % (element, d.name))
227                value = attrs.get(d.fullname, d.default)
228    
229                if d.conversion in ("idref", "shapesource"):
230                    if value in self.idmap:
231                        value = self.idmap[value]
232                    else:
233                        raise LoadError("Element %s requires an already defined ID"
234                                        " in attribute %r"
235                                        % (element, d.name))
236                elif d.conversion == "table":
237                    if value in self.idmap:
238                        value = self.idmap[value]
239                        if isinstance(value, ShapefileStore):
240                            value = value.Table()
241                    else:
242                        raise LoadError("Element %s requires an already defined ID"
243                                        " in attribute %r"
244                                        % (element, d.name))
245                elif d.conversion == "filename":
246                    value = os.path.abspath(os.path.join(self.GetDirectory(),
247                                                         value))
248                elif d.conversion == "ascii":
249                    value = value.encode("ascii")
250                elif d.conversion:
251                    # Assume it's a callable
252                    value = d.conversion(value)
253                else:
254                   value = self.encode(value)
255    
256                normalized[d.name] = value
257            return normalized
258    
259        def start_dbconnection(self, name, qname, attrs):
260            attrs = self.check_attrs(name, attrs,
261                                     [AttrDesc("id", True),
262                                      AttrDesc("dbtype", True),
263                                      AttrDesc("host", False, ""),
264                                      AttrDesc("port", False, ""),
265                                      AttrDesc("user", False, ""),
266                                      AttrDesc("dbname", True)])
267            ID = attrs["id"]
268            dbtype = attrs["dbtype"]
269            if dbtype != "postgis":
270                raise LoadError("dbtype %r not supported" % filetype)
271    
272            del attrs["id"]
273            del attrs["dbtype"]
274    
275            # Try to open the connection and if it fails ask the user for
276            # the correct parameters repeatedly.
277            # FIXME: it would be better not to insist on getting a
278            # connection here. We should handle this more like the raster
279            # images where the layers etc still are created but are not
280            # drawn in case Thuban can't use the data for various reasons
281            while 1:
282                try:
283                    conn = postgisdb.PostGISConnection(**attrs)
284                    break
285                except postgisdb.ConnectionError, val:
286                    if self.db_connection_callback is not None:
287                        attrs = self.db_connection_callback(attrs, str(val))
288                        if attrs is None:
289                            raise LoadCancelled
290                    else:
291                        raise
292    
293            self.idmap[ID] = conn
294            self.theSession.AddDBConnection(conn)
295    
296        def start_dbshapesource(self, name, qname, attrs):
297            attrs = self.check_attrs(name, attrs,
298                                     [AttrDesc("id", True),
299                                      AttrDesc("dbconn", True,
300                                               conversion = "idref"),
301                                      AttrDesc("tablename", True,
302                                               conversion = "ascii")])
303            ID = attrs["id"]
304            db = attrs["dbconn"]
305            tablename = attrs["tablename"]
306            self.idmap[ID] = self.theSession.OpenDBShapeStore(db, tablename)
307    
308        def start_fileshapesource(self, name, qname, attrs):
309            attrs = self.check_attrs(name, attrs,
310                                      [AttrDesc("id", True),
311                                       AttrDesc("filename", True,
312                                                conversion = "filename"),
313                                       AttrDesc("filetype", True)])
314            ID = attrs["id"]
315            filename = attrs["filename"]
316            filetype = attrs["filetype"]
317            if filetype != "shapefile":
318                raise LoadError("shapesource filetype %r not supported" % filetype)
319            self.idmap[ID] = self.theSession.OpenShapefile(filename)
320    
321        def start_derivedshapesource(self, name, qname, attrs):
322            attrs = self.check_attrs(name, attrs,
323                                     [AttrDesc("id", True),
324                                      AttrDesc("shapesource", True,
325                                               conversion = "shapesource"),
326                                      AttrDesc("table", True, conversion="table")])
327            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
328            self.theSession.AddShapeStore(store)
329            self.idmap[attrs["id"]] = store
330    
331        def start_filetable(self, name, qname, attrs):
332            attrs = self.check_attrs(name, attrs,
333                                     [AttrDesc("id", True),
334                                      AttrDesc("title", True),
335                                      AttrDesc("filename", True,
336                                               conversion = "filename"),
337                                      AttrDesc("filetype")])
338            filetype = attrs["filetype"]
339            if filetype != "DBF":
340                raise LoadError("shapesource filetype %r not supported" % filetype)
341            table = DBFTable(attrs["filename"])
342            table.SetTitle(attrs["title"])
343            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
344    
345        def start_jointable(self, name, qname, attrs):
346            attrs = self.check_attrs(name, attrs,
347                                     [AttrDesc("id", True),
348                                      AttrDesc("title", True),
349                                      AttrDesc("left", True, conversion="table"),
350                                      AttrDesc("leftcolumn", True),
351                                      AttrDesc("right", True, conversion="table"),
352                                      AttrDesc("rightcolumn", True),
353    
354                                      # jointype is required for file
355                                      # version 0.9 but this attribute
356                                      # wasn't in the 0.8 version because of
357                                      # an oversight so we assume it's
358                                      # optional since we want to handle
359                                      # both file format versions here.
360                                      AttrDesc("jointype", False,
361                                               default="INNER")])
362    
363            jointype = attrs["jointype"]
364            if jointype == "LEFT OUTER":
365                outer_join = True
366            elif jointype == "INNER":
367                outer_join = False
368            else:
369                raise LoadError("jointype %r not supported" % jointype )
370            table = TransientJoinedTable(self.theSession.TransientDB(),
371                                         attrs["left"], attrs["leftcolumn"],
372                                         attrs["right"], attrs["rightcolumn"],
373                                         outer_join = outer_join)
374            table.SetTitle(attrs["title"])
375            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
376    
377      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
378          """Start a map."""          """Start a map."""
379          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
         self.__projReceiver = self.aMap  
380    
381      def end_map(self, name, qname):      def end_map(self, name, qname):
382          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
383          self.__projReceiver = None          self.aMap = None
384    
385      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
386          self.ProjectionParams = [ ]          attrs = self.check_attrs(name, attrs,
387                                     [AttrDesc("name", conversion=self.encode),
388                                      AttrDesc("epsg", default=None,
389                                               conversion=self.encode)])
390            self.projection_name = attrs["name"]
391            self.projection_epsg = attrs["epsg"]
392            self.projection_params = [ ]
393    
394      def end_projection(self, name, qname):      def end_projection(self, name, qname):
395          self.__projReceiver.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
396                obj = self.aLayer
397            elif self.aMap is not None:
398                obj = self.aMap
399            else:
400                assert False, "projection tag out of context"
401                pass
402    
403            obj.SetProjection(Projection(self.projection_params,
404                                         self.projection_name,
405                                         epsg = self.projection_epsg))
406    
407      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
408          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
409          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
410          self.ProjectionParams.append(s)          self.projection_params.append(s)
411    
412      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
413          """Start a layer          """Start a layer
# Line 225  class SessionLoader(XMLReader): Line 416  class SessionLoader(XMLReader):
416          attrs which may be a dictionary as well as the normal SAX attrs          attrs which may be a dictionary as well as the normal SAX attrs
417          object and bind it to self.aLayer.          object and bind it to self.aLayer.
418          """          """
419          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
420          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
421          filename = os.path.join(self.GetDirectory(), filename)          filename = os.path.join(self.GetDirectory(), filename)
422            filename = self.encode(filename)
423            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
424          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
425          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
426          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
427          self.aLayer = layer_class(title,          if attrs.has_key((None, "shapestore")):
428                                    self.theSession.OpenShapefile(filename),              store = self.idmap[attrs[(None, "shapestore")]]
429            else:
430                store = self.theSession.OpenShapefile(filename)
431            self.aLayer = layer_class(title, store,
432                                    fill = fill, stroke = stroke,                                    fill = fill, stroke = stroke,
433                                    lineWidth = stroke_width)                                    lineWidth = stroke_width,
434                                      visible = visible)
         self.__projReceiver = self.aLayer  
435    
436      def end_layer(self, name, qname):      def end_layer(self, name, qname):
437          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
438          self.__projReceiver = None          self.aLayer = None
439    
440        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
441            title = self.encode(attrs.get((None, 'title'), ""))
442            filename = attrs.get((None, 'filename'), "")
443            filename = os.path.join(self.GetDirectory(), filename)
444            filename = self.encode(filename)
445            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
446    
447            self.aLayer = layer_class(title, filename, visible = visible)
448    
449        def end_rasterlayer(self, name, qname):
450            self.aMap.AddLayer(self.aLayer)
451            self.aLayer = None
452    
453      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
454          field = attrs.get((None, 'field'), None)          attrs = self.check_attrs(name, attrs,
455                                     [AttrDesc("field", True),
456                                      AttrDesc("field_type", True)])
457            field = attrs["field"]
458            fieldType = attrs["field_type"]
459    
         fieldType = attrs.get((None, 'field_type'), None)  
460          dbFieldType = self.aLayer.GetFieldType(field)          dbFieldType = self.aLayer.GetFieldType(field)
461    
462          if fieldType != dbFieldType:          if fieldType != dbFieldType:
# Line 260  class SessionLoader(XMLReader): Line 471  class SessionLoader(XMLReader):
471          elif fieldType == FIELDTYPE_DOUBLE:          elif fieldType == FIELDTYPE_DOUBLE:
472              self.conv = float              self.conv = float
473    
474          self.aLayer.GetClassification().SetField(field)          self.aLayer.SetClassificationColumn(field)
   
475    
476      def end_classification(self, name, qname):      def end_classification(self, name, qname):
477          pass          pass
478    
479      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
480          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
481          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
482          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
483    
484      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
# Line 279  class SessionLoader(XMLReader): Line 489  class SessionLoader(XMLReader):
489      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
490          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
491    
492          #try:          field = self.aLayer.GetClassificationColumn()
493              #value  = Str2Num(attrib_value)          if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
494          #except:              value = self.encode(attrib_value)
495              #value  = attrib_value          else:
496                value = self.conv(attrib_value)
         value = self.conv(attrib_value)  
   
497          self.cl_group = ClassGroupSingleton(value)          self.cl_group = ClassGroupSingleton(value)
498          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
499          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
500    
501    
# Line 298  class SessionLoader(XMLReader): Line 506  class SessionLoader(XMLReader):
506    
507      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
508    
509            range = attrs.get((None, 'range'), None)
510            # for backward compatibility (min/max are not saved)
511            min   = attrs.get((None, 'min'), None)
512            max   = attrs.get((None, 'max'), None)
513    
514          try:          try:
515              min = self.conv(attrs.get((None, 'min'), "0"))              if range is not None:
516              max = self.conv(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
517              #min = Str2Num(attrs.get((None, 'min'), "0"))              elif min is not None and max is not None:
518              #max = Str2Num(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange((self.conv(min),
519                                                     self.conv(max)))
520                else:
521                    self.cl_group = ClassGroupRange(Range(None))
522    
523          except ValueError:          except ValueError:
524              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
525    
         self.cl_group = ClassGroupRange(min, max)  
526          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
527          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
528    
# Line 326  class SessionLoader(XMLReader): Line 542  class SessionLoader(XMLReader):
542      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
543          pass          pass
544    
     def start_table(self, name, qname, attrs):  
         #print "table title: %s" % attrs.get('title', None)  
         pass  
   
     def end_table(self, name, qname):  
         pass  
   
545      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
546          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
547    
548      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
549          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
550          y = float(attrs[(None, 'y')])          y = float(attrs[(None, 'y')])
551          text = attrs[(None, 'text')]          text = self.encode(attrs[(None, 'text')])
552          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
553          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
554          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
# Line 348  class SessionLoader(XMLReader): Line 557  class SessionLoader(XMLReader):
557          pass          pass
558    
559    
560  def load_session(filename):  def load_session(filename, db_connection_callback = None):
561      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file
562    
563      handler = SessionLoader()      The db_connection_callback, if given should be a callable object
564        that can be called like this:
565           db_connection_callback(params, message)
566    
567        where params is a dictionary containing the known connection
568        parameters and message is a string with a message why the connection
569        failed. db_connection_callback should return a new dictionary with
570        corrected and perhaps additional parameters like a password or None
571        to indicate that the user cancelled.
572        """
573        handler = SessionLoader(db_connection_callback)
574      handler.read(filename)      handler.read(filename)
575    
576      session = handler.theSession      session = handler.theSession
577      # Newly loaded session aren't modified      # Newly loaded session aren't modified
578      session.UnsetModified()      session.UnsetModified()
579    
580        handler.Destroy()
581    
582      return session      return session
583    
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