/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 374 by jan, Mon Jan 27 14:20:02 2003 UTC revision 2036 by bh, Mon Dec 22 17:49:43 2003 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
4  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
5    # Jonathan Coles <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with GRASS for details.  # Read the file COPYING coming with GRASS for details.
# Line 12  Parser for thuban session files. Line 13  Parser for thuban session files.
13    
14  __version__ = "$Revision$"  __version__ = "$Revision$"
15    
16  import sys, string, os  import string, os
17    
18  import xml.sax  import xml.sax
19  import xml.sax.handler  import xml.sax.handler
20  from xml.sax import make_parser, ErrorHandler  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21    
22  from Thuban import _  from Thuban import _
23    
24    from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
25         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.classification import Classification  from Thuban.Model.range import Range
34    from Thuban.Model.classification import Classification, \
35        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
36        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 35  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 = None          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 49  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 ProcessSession(xml.sax.handler.ContentHandler):      def __init__(self, name, required = False, default = "",
85                     conversion = None):
86            if not isinstance(name, tuple):
87                fullname = (None, name)
88            else:
89                fullname = name
90                name = name[1]
91            self.name = name
92            self.fullname = fullname
93            self.required = required
94            self.default = default
95            self.conversion = conversion
96    
97            # set by the SessionLoader's check_attrs method
98            self.value = None
99    
100    
101    class SessionLoader(XMLReader):
102    
103        def __init__(self, db_connection_callback = None):
104            """Inititialize the Sax handler."""
105            XMLReader.__init__(self)
106    
107            self.db_connection_callback = db_connection_callback
108    
     # Dictionary mapping element names (or (URI, element name) pairs for  
     # documents using namespaces) to method names. The methods should  
     # 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, directory):  
         """Inititialize the Sax handler.  
   
         The directory parameter should be the directory containing the  
         session file. It's needed to interpret embedded relative  
         filenames.  
         """  
         self.directory = directory  
         self.chars = ''  
109          self.theSession = None          self.theSession = None
110          self.aMap = None          self.aMap = None
111          self.aLayer = None          self.aLayer = None
112    
113      def startElementNS(self, name, qname, attrs):          # Map ids used in the thuban file to the corresponding objects
114          """Call the method given for name in self.start_dispatcher          # in the session
115          """          self.idmap = {}
116          if name[0] is None:  
117              method_name = self.start_dispatcher.get(name[1])          dispatchers = {
118          else:              'session'       : ("start_session",        "end_session"),
119              # Dispatch with namespace  
120              method_name = self.start_dispatcher.get(name)              'dbconnection': ("start_dbconnection", None),
121          if method_name is not None:  
122              getattr(self, method_name)(name, qname, attrs)              'dbshapesource': ("start_dbshapesource", None),
123                'fileshapesource': ("start_fileshapesource", None),
124      def endElementNS(self, name, qname):              'derivedshapesource': ("start_derivedshapesource", None),
125          """Call the method given for name in self.end_dispatcher              'filetable': ("start_filetable", None),
126                '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                          "http://thuban.intevation.org/dtds/thuban-1.0.0.dtd"):
149                for key, value in dispatchers.items():
150                    dispatchers[(xmlns, key)] = value
151    
152            XMLReader.AddDispatchers(self, dispatchers)
153    
154        def Destroy(self):
155            """Clear all instance variables to cut cyclic references.
156    
157            The GC would have collected the loader eventually but it can
158            happen that it doesn't run at all until Thuban is closed (2.3
159            but not 2.2 tries a bit harder and forces a collection when the
160            interpreter terminates)
161          """          """
162          if name[0] is None:          self.__dict__.clear()
             method_name = self.end_dispatcher.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.end_dispatcher.get(name)  
         if method_name is not None:  
             getattr(self, method_name)(name, qname)  
163    
164      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
165          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'),
166      start_dispatcher['session'] = "start_session"                                                          None)))
167    
168      def end_session(self, name, qname):      def end_session(self, name, qname):
169          pass          pass
170      end_dispatcher['session'] = "end_session"  
171        def check_attrs(self, element, attrs, descr):
172            """Check and convert some of the attributes of an element
173    
174            Parameters:
175               element -- The element name
176               attrs -- The attrs mapping as passed to the start_* methods
177               descr -- Sequence of attribute descriptions (AttrDesc instances)
178    
179            Return a dictionary containig normalized versions of the
180            attributes described in descr. The keys of that dictionary are
181            the name attributes of the attribute descriptions. The attrs
182            dictionary will not be modified.
183    
184            If the attribute is required, i.e. the 'required' attribute of
185            the descrtiption is true, but it is not in attrs, raise a
186            LoadError.
187    
188            If the attribute has a default value and it is not present in
189            attrs, use that default value as the value in the returned dict.
190    
191            The value is converted before putting it into the returned dict.
192            The following conversions are available:
193    
194               'filename' -- The attribute is a filename.
195    
196                             If the filename is a relative name, interpret
197                             it relative to the directory containing the
198                             .thuban file and make it an absolute name
199    
200               'shapestore' -- The attribute is the ID of a shapestore
201                               defined earlier in the .thuban file. Look it
202                               up self.idmap
203    
204               'table' -- The attribute is the ID of a table or shapestore
205                          defined earlier in the .thuban file. Look it up
206                          self.idmap. If it's the ID of a shapestore the
207                          value will be the table of the shapestore.
208    
209               'idref' -- The attribute is the id of an object defined
210                          earlier in the .thuban file. Look it up self.idmap
211    
212               'ascii' -- The attribute is converted to a bytestring with
213                          ascii encoding.
214    
215               a callable -- The attribute value is passed to the callable
216                             and the return value is used as the converted
217                             value
218    
219            If no conversion is specified for an attribute it is converted
220            with self.encode.
221            """
222            normalized = {}
223    
224            for d in descr:
225                if d.required and not attrs.has_key(d.fullname):
226                    raise LoadError("Element %s requires an attribute %r"
227                                    % (element, d.name))
228                value = attrs.get(d.fullname, d.default)
229    
230                if d.conversion in ("idref", "shapesource"):
231                    if value in self.idmap:
232                        value = self.idmap[value]
233                    else:
234                        raise LoadError("Element %s requires an already defined ID"
235                                        " in attribute %r"
236                                        % (element, d.name))
237                elif d.conversion == "table":
238                    if value in self.idmap:
239                        value = self.idmap[value]
240                        if isinstance(value, ShapefileStore):
241                            value = value.Table()
242                    else:
243                        raise LoadError("Element %s requires an already defined ID"
244                                        " in attribute %r"
245                                        % (element, d.name))
246                elif d.conversion == "filename":
247                    value = os.path.abspath(os.path.join(self.GetDirectory(),
248                                                         value))
249                elif d.conversion == "ascii":
250                    value = value.encode("ascii")
251                elif d.conversion:
252                    # Assume it's a callable
253                    value = d.conversion(value)
254                else:
255                   value = self.encode(value)
256    
257                normalized[d.name] = value
258            return normalized
259    
260        def start_dbconnection(self, name, qname, attrs):
261            attrs = self.check_attrs(name, attrs,
262                                     [AttrDesc("id", True),
263                                      AttrDesc("dbtype", True),
264                                      AttrDesc("host", False, ""),
265                                      AttrDesc("port", False, ""),
266                                      AttrDesc("user", False, ""),
267                                      AttrDesc("dbname", True)])
268            ID = attrs["id"]
269            dbtype = attrs["dbtype"]
270            if dbtype != "postgis":
271                raise LoadError("dbtype %r not supported" % filetype)
272    
273            del attrs["id"]
274            del attrs["dbtype"]
275    
276            # Try to open the connection and if it fails ask the user for
277            # the correct parameters repeatedly.
278            # FIXME: it would be better not to insist on getting a
279            # connection here. We should handle this more like the raster
280            # images where the layers etc still are created but are not
281            # drawn in case Thuban can't use the data for various reasons
282            while 1:
283                try:
284                    conn = postgisdb.PostGISConnection(**attrs)
285                    break
286                except postgisdb.ConnectionError, val:
287                    if self.db_connection_callback is not None:
288                        attrs = self.db_connection_callback(attrs, str(val))
289                        if attrs is None:
290                            raise LoadCancelled
291                    else:
292                        raise
293    
294            self.idmap[ID] = conn
295            self.theSession.AddDBConnection(conn)
296    
297        def start_dbshapesource(self, name, qname, attrs):
298            attrs = self.check_attrs(name, attrs,
299                                     [AttrDesc("id", True),
300                                      AttrDesc("dbconn", True,
301                                               conversion = "idref"),
302                                      AttrDesc("tablename", True,
303                                               conversion = "ascii")])
304            ID = attrs["id"]
305            db = attrs["dbconn"]
306            tablename = attrs["tablename"]
307            self.idmap[ID] = self.theSession.OpenDBShapeStore(db, tablename)
308    
309        def start_fileshapesource(self, name, qname, attrs):
310            attrs = self.check_attrs(name, attrs,
311                                      [AttrDesc("id", True),
312                                       AttrDesc("filename", True,
313                                                conversion = "filename"),
314                                       AttrDesc("filetype", True)])
315            ID = attrs["id"]
316            filename = attrs["filename"]
317            filetype = attrs["filetype"]
318            if filetype != "shapefile":
319                raise LoadError("shapesource filetype %r not supported" % filetype)
320            self.idmap[ID] = self.theSession.OpenShapefile(filename)
321    
322        def start_derivedshapesource(self, name, qname, attrs):
323            attrs = self.check_attrs(name, attrs,
324                                     [AttrDesc("id", True),
325                                      AttrDesc("shapesource", True,
326                                               conversion = "shapesource"),
327                                      AttrDesc("table", True, conversion="table")])
328            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
329            self.theSession.AddShapeStore(store)
330            self.idmap[attrs["id"]] = store
331    
332        def start_filetable(self, name, qname, attrs):
333            attrs = self.check_attrs(name, attrs,
334                                     [AttrDesc("id", True),
335                                      AttrDesc("title", True),
336                                      AttrDesc("filename", True,
337                                               conversion = "filename"),
338                                      AttrDesc("filetype")])
339            filetype = attrs["filetype"]
340            if filetype != "DBF":
341                raise LoadError("shapesource filetype %r not supported" % filetype)
342            table = DBFTable(attrs["filename"])
343            table.SetTitle(attrs["title"])
344            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
345    
346        def start_jointable(self, name, qname, attrs):
347            attrs = self.check_attrs(name, attrs,
348                                     [AttrDesc("id", True),
349                                      AttrDesc("title", True),
350                                      AttrDesc("left", True, conversion="table"),
351                                      AttrDesc("leftcolumn", True),
352                                      AttrDesc("right", True, conversion="table"),
353                                      AttrDesc("rightcolumn", True),
354    
355                                      # jointype is required for file
356                                      # version 0.9 but this attribute
357                                      # wasn't in the 0.8 version because of
358                                      # an oversight so we assume it's
359                                      # optional since we want to handle
360                                      # both file format versions here.
361                                      AttrDesc("jointype", False,
362                                               default="INNER")])
363    
364            jointype = attrs["jointype"]
365            if jointype == "LEFT OUTER":
366                outer_join = True
367            elif jointype == "INNER":
368                outer_join = False
369            else:
370                raise LoadError("jointype %r not supported" % jointype )
371            table = TransientJoinedTable(self.theSession.TransientDB(),
372                                         attrs["left"], attrs["leftcolumn"],
373                                         attrs["right"], attrs["rightcolumn"],
374                                         outer_join = outer_join)
375            table.SetTitle(attrs["title"])
376            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
377    
378      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
379          """Start a map."""          """Start a map."""
380          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
     start_dispatcher['map'] = "start_map"  
381    
382      def end_map(self, name, qname):      def end_map(self, name, qname):
383          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
384      end_dispatcher['map'] = "end_map"          self.aMap = None
385    
386      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
387          self.ProjectionParams = [ ]          attrs = self.check_attrs(name, attrs,
388      start_dispatcher['projection'] = "start_projection"                                   [AttrDesc("name", conversion=self.encode),
389                                      AttrDesc("epsg", default=None,
390                                               conversion=self.encode)])
391            self.projection_name = attrs["name"]
392            self.projection_epsg = attrs["epsg"]
393            self.projection_params = [ ]
394    
395      def end_projection(self, name, qname):      def end_projection(self, name, qname):
396          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
397      end_dispatcher['projection'] = "end_projection"              obj = self.aLayer
398            elif self.aMap is not None:
399                obj = self.aMap
400            else:
401                assert False, "projection tag out of context"
402                pass
403    
404            obj.SetProjection(Projection(self.projection_params,
405                                         self.projection_name,
406                                         epsg = self.projection_epsg))
407    
408      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
409          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
410          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
411          self.ProjectionParams.append(s)          self.projection_params.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
412    
413      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
414          """Start a layer          """Start a layer
# Line 139  class ProcessSession(xml.sax.handler.Con Line 417  class ProcessSession(xml.sax.handler.Con
417          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
418          object and bind it to self.aLayer.          object and bind it to self.aLayer.
419          """          """
420          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
421          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
422          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
423            filename = self.encode(filename)
424            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
425          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
426          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
427          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
428          self.aLayer = layer_class(title, filename, fill = fill,          if attrs.has_key((None, "shapestore")):
429                                    stroke = stroke, stroke_width = stroke_width)              store = self.idmap[attrs[(None, "shapestore")]]
430      start_dispatcher['layer'] = "start_layer"          else:
431                store = self.theSession.OpenShapefile(filename)
432            self.aLayer = layer_class(title, store,
433                                      fill = fill, stroke = stroke,
434                                      lineWidth = stroke_width,
435                                      visible = visible)
436    
437      def end_layer(self, name, qname):      def end_layer(self, name, qname):
438          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
439      end_dispatcher['layer'] = "end_layer"          self.aLayer = None
440    
441        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
442            title = self.encode(attrs.get((None, 'title'), ""))
443            filename = attrs.get((None, 'filename'), "")
444            filename = os.path.join(self.GetDirectory(), filename)
445            filename = self.encode(filename)
446            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
447    
448            self.aLayer = layer_class(title, filename, visible = visible)
449    
450        def end_rasterlayer(self, name, qname):
451            self.aMap.AddLayer(self.aLayer)
452            self.aLayer = None
453    
454      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
455          self.aLayer.classification.setField(attrs.get((None, 'field'), None))          attrs = self.check_attrs(name, attrs,
456      start_dispatcher['classification'] = "start_classification"                                   [AttrDesc("field", True),
457                                      AttrDesc("field_type", True)])
458            field = attrs["field"]
459            fieldType = attrs["field_type"]
460    
461            dbFieldType = self.aLayer.GetFieldType(field)
462    
463            if fieldType != dbFieldType:
464                raise ValueError(_("xml field type differs from database!"))
465    
466            # setup conversion routines depending on the kind of data
467            # we will be seeing later on
468            if fieldType == FIELDTYPE_STRING:
469                self.conv = str
470            elif fieldType == FIELDTYPE_INT:
471                self.conv = lambda p: int(float(p))
472            elif fieldType == FIELDTYPE_DOUBLE:
473                self.conv = float
474    
475            self.aLayer.SetClassificationColumn(field)
476    
477      def end_classification(self, name, qname):      def end_classification(self, name, qname):
478          pass          pass
     end_dispatcher['classification'] = "end_classification"  
479    
480      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
481          self.cl_data = {}          self.cl_group = ClassGroupDefault()
482      start_dispatcher['clnull'] = "start_clnull"          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
483            self.cl_prop = ClassGroupProperties()
484    
485      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
486          self.aLayer.classification.setNull(self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
487          del self.cl_data          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
488      end_dispatcher['clnull'] = "end_clnull"          del self.cl_group, self.cl_prop
489    
490      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
491          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
492    
493          try:          field = self.aLayer.GetClassificationColumn()
494              self.cl_value  = int(attrib_value)          if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
495          except:              value = self.encode(attrib_value)
496              self.cl_value  = attrib_value          else:
497                value = self.conv(attrib_value)
498            self.cl_group = ClassGroupSingleton(value)
499            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
500            self.cl_prop = ClassGroupProperties()
501    
         self.cl_data = {}  
     start_dispatcher['clpoint'] = "start_clpoint"  
502    
503      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
504          self.aLayer.classification.addPoint(self.cl_value, self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
505          del self.cl_value, self.cl_data          self.aLayer.GetClassification().AppendGroup(self.cl_group)
506      end_dispatcher['clpoint'] = "end_clpoint"          del self.cl_group, self.cl_prop
507    
508      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
509    
510            range = attrs.get((None, 'range'), None)
511            # for backward compatibility (min/max are not saved)
512            min   = attrs.get((None, 'min'), None)
513            max   = attrs.get((None, 'max'), None)
514    
515          try:          try:
516              self.cl_low = int(attrs.get((None, 'low'), "0"))              if range is not None:
517              self.cl_high = int(attrs.get((None, 'high'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
518                elif min is not None and max is not None:
519                    self.cl_group = ClassGroupRange((self.conv(min),
520                                                     self.conv(max)))
521                else:
522                    self.cl_group = ClassGroupRange(Range(None))
523    
524          except ValueError:          except ValueError:
525              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
526    
527          self.cl_data = {}          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
528      start_dispatcher['clrange'] = "start_clrange"          self.cl_prop = ClassGroupProperties()
529    
530    
531      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
532          self.aLayer.classification.addRange(          self.cl_group.SetProperties(self.cl_prop)
533              self.cl_low, self.cl_high, self.cl_data)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
534          del self.cl_low, self.cl_high, self.cl_data          del self.cl_group, self.cl_prop
     end_dispatcher['clrange'] = "end_clrange"  
535    
536      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
537          self.cl_data['stroke'] = parse_color(          self.cl_prop.SetLineColor(
538                                   attrs.get((None, 'stroke'), "None"))              parse_color(attrs.get((None, 'stroke'), "None")))
539          self.cl_data['stroke_width'] = int(          self.cl_prop.SetLineWidth(
540                                   attrs.get((None, 'stroke_width'), "0"))              int(attrs.get((None, 'stroke_width'), "0")))
541          self.cl_data['fill'] = parse_color(          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
                                  attrs.get((None, 'fill'), "None"))  
     start_dispatcher['cldata'] = "start_cldata"  
542    
543      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
544          pass          pass
     end_dispatcher['cldata'] = "end_cldata"  
   
     def start_table(self, name, qname, attrs):  
         print "table title: %s" % attrs.get('title', None)  
     start_dispatcher['table'] = "start_table"  
   
     def end_table(self, name, qname):  
         pass  
     end_dispatcher['table'] = "end_table"  
545    
546      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
547          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
548    
549      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
550          x = float(attrs[(None, 'x')])          attrs = self.check_attrs(name, attrs,
551          y = float(attrs[(None, 'y')])                                   [AttrDesc("x", True, conversion = float),
552          text = attrs[(None, 'text')]                                    AttrDesc("y", True, conversion = float),
553          halign = attrs[(None, 'halign')]                                    AttrDesc("text", True),
554          valign = attrs[(None, 'valign')]                                    AttrDesc("halign", True,
555                                               conversion = "ascii"),
556                                      AttrDesc("valign", True,
557                                               conversion = "ascii")])
558            x = attrs['x']
559            y = attrs['y']
560            text = attrs['text']
561            halign = attrs['halign']
562            valign = attrs['valign']
563            if halign not in ("left", "center", "right"):
564                raise LoadError("Unsupported halign value %r" % halign)
565            if valign not in ("top", "center", "bottom"):
566                raise LoadError("Unsupported valign value %r" % valign)
567          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
     start_dispatcher['label'] = "start_label"  
568    
569      def characters(self, chars):      def characters(self, chars):
570          pass          pass
571    
572    
573  def load_session(filename):  def load_session(filename, db_connection_callback = None):
574      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file
575      dir = os.path.dirname(filename)  
576      file = open(filename)      The db_connection_callback, if given should be a callable object
577      handler = ProcessSession(dir)      that can be called like this:
578           db_connection_callback(params, message)
579      parser = make_parser()  
580      parser.setContentHandler(handler)      where params is a dictionary containing the known connection
581      parser.setErrorHandler(ErrorHandler())      parameters and message is a string with a message why the connection
582      parser.setFeature(xml.sax.handler.feature_namespaces, 1)      failed. db_connection_callback should return a new dictionary with
583      parser.parse(file)      corrected and perhaps additional parameters like a password or None
584        to indicate that the user cancelled.
585        """
586        handler = SessionLoader(db_connection_callback)
587        handler.read(filename)
588    
589      session = handler.theSession      session = handler.theSession
590      # Newly loaded session aren't modified      # Newly loaded session aren't modified
591      session.UnsetModified()      session.UnsetModified()
592    
593        handler.Destroy()
594    
595      return session      return session
596    
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