/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 390 by jonathan, Mon Feb 10 15:25:49 2003 UTC revision 2375 by jan, Sun Oct 3 21:05:30 2004 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003, 2004 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, ClassData  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                          "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"):
150                for key, value in dispatchers.items():
151                    dispatchers[(xmlns, key)] = value
152    
153            XMLReader.AddDispatchers(self, dispatchers)
154    
155        def Destroy(self):
156            """Clear all instance variables to cut cyclic references.
157    
158            The GC would have collected the loader eventually but it can
159            happen that it doesn't run at all until Thuban is closed (2.3
160            but not 2.2 tries a bit harder and forces a collection when the
161            interpreter terminates)
162          """          """
163          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)  
164    
165      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
166          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'),
167      start_dispatcher['session'] = "start_session"                                                          None)))
168    
169      def end_session(self, name, qname):      def end_session(self, name, qname):
170          pass          pass
171      end_dispatcher['session'] = "end_session"  
172        def check_attrs(self, element, attrs, descr):
173            """Check and convert some of the attributes of an element
174    
175            Parameters:
176               element -- The element name
177               attrs -- The attrs mapping as passed to the start_* methods
178               descr -- Sequence of attribute descriptions (AttrDesc instances)
179    
180            Return a dictionary containig normalized versions of the
181            attributes described in descr. The keys of that dictionary are
182            the name attributes of the attribute descriptions. The attrs
183            dictionary will not be modified.
184    
185            If the attribute is required, i.e. the 'required' attribute of
186            the descrtiption is true, but it is not in attrs, raise a
187            LoadError.
188    
189            If the attribute has a default value and it is not present in
190            attrs, use that default value as the value in the returned dict.
191    
192            The value is converted before putting it into the returned dict.
193            The following conversions are available:
194    
195               'filename' -- The attribute is a filename.
196    
197                             If the filename is a relative name, interpret
198                             it relative to the directory containing the
199                             .thuban file and make it an absolute name
200    
201               'shapestore' -- The attribute is the ID of a shapestore
202                               defined earlier in the .thuban file. Look it
203                               up self.idmap
204    
205               'table' -- The attribute is the ID of a table or shapestore
206                          defined earlier in the .thuban file. Look it up
207                          self.idmap. If it's the ID of a shapestore the
208                          value will be the table of the shapestore.
209    
210               'idref' -- The attribute is the id of an object defined
211                          earlier in the .thuban file. Look it up self.idmap
212    
213               'ascii' -- The attribute is converted to a bytestring with
214                          ascii encoding.
215    
216               a callable -- The attribute value is passed to the callable
217                             and the return value is used as the converted
218                             value
219    
220            If no conversion is specified for an attribute it is converted
221            with self.encode.
222            """
223            normalized = {}
224    
225            for d in descr:
226                if d.required and not attrs.has_key(d.fullname):
227                    raise LoadError("Element %s requires an attribute %r"
228                                    % (element, d.name))
229                value = attrs.get(d.fullname, d.default)
230    
231                if d.conversion in ("idref", "shapesource"):
232                    if value in self.idmap:
233                        value = self.idmap[value]
234                    else:
235                        raise LoadError("Element %s requires an already defined ID"
236                                        " in attribute %r"
237                                        % (element, d.name))
238                elif d.conversion == "table":
239                    if value in self.idmap:
240                        value = self.idmap[value]
241                        if isinstance(value, ShapefileStore):
242                            value = value.Table()
243                    else:
244                        raise LoadError("Element %s requires an already defined ID"
245                                        " in attribute %r"
246                                        % (element, d.name))
247                elif d.conversion == "filename":
248                    value = os.path.abspath(os.path.join(self.GetDirectory(),
249                                                         value))
250                elif d.conversion == "ascii":
251                    value = value.encode("ascii")
252                elif d.conversion:
253                    # Assume it's a callable
254                    value = d.conversion(value)
255                else:
256                   value = self.encode(value)
257    
258                normalized[d.name] = value
259            return normalized
260    
261        def start_dbconnection(self, name, qname, attrs):
262            attrs = self.check_attrs(name, attrs,
263                                     [AttrDesc("id", True),
264                                      AttrDesc("dbtype", True),
265                                      AttrDesc("host", False, ""),
266                                      AttrDesc("port", False, ""),
267                                      AttrDesc("user", False, ""),
268                                      AttrDesc("dbname", True)])
269            ID = attrs["id"]
270            dbtype = attrs["dbtype"]
271            if dbtype != "postgis":
272                raise LoadError("dbtype %r not supported" % filetype)
273    
274            del attrs["id"]
275            del attrs["dbtype"]
276    
277            # Try to open the connection and if it fails ask the user for
278            # the correct parameters repeatedly.
279            # FIXME: it would be better not to insist on getting a
280            # connection here. We should handle this more like the raster
281            # images where the layers etc still are created but are not
282            # drawn in case Thuban can't use the data for various reasons
283            while 1:
284                try:
285                    conn = postgisdb.PostGISConnection(**attrs)
286                    break
287                except postgisdb.ConnectionError, val:
288                    if self.db_connection_callback is not None:
289                        attrs = self.db_connection_callback(attrs, str(val))
290                        if attrs is None:
291                            raise LoadCancelled
292                    else:
293                        raise
294    
295            self.idmap[ID] = conn
296            self.theSession.AddDBConnection(conn)
297    
298        def start_dbshapesource(self, name, qname, attrs):
299            attrs = self.check_attrs(name, attrs,
300                                     [AttrDesc("id", True),
301                                      AttrDesc("dbconn", True,
302                                               conversion = "idref"),
303                                      AttrDesc("tablename", True,
304                                               conversion = "ascii"),
305                                      # id_column and geometry_column were
306                                      # newly introduced with thuban-1.1.dtd
307                                      # where they're required.  Since we
308                                      # support the older formats too we
309                                      # have them optional here.
310                                      AttrDesc("id_column", False, "gid",
311                                               conversion = "ascii"),
312                                      AttrDesc("geometry_column", False,
313                                               conversion = "ascii")])
314            # The default value of geometry_column to use when instantiating
315            # the db shapestore is None which we currently can't easily use
316            # in check_attrs
317            geometry_column = attrs["geometry_column"]
318            if not geometry_column:
319                geometry_column = None
320            dbopen = self.theSession.OpenDBShapeStore
321            self.idmap[attrs["id"]] = dbopen(attrs["dbconn"], attrs["tablename"],
322                                             id_column = attrs["id_column"],
323                                             geometry_column=geometry_column)
324    
325        def start_fileshapesource(self, name, qname, attrs):
326            attrs = self.check_attrs(name, attrs,
327                                      [AttrDesc("id", True),
328                                       AttrDesc("filename", True,
329                                                conversion = "filename"),
330                                       AttrDesc("filetype", True)])
331            ID = attrs["id"]
332            filename = attrs["filename"]
333            filetype = attrs["filetype"]
334            if filetype != "shapefile":
335                raise LoadError("shapesource filetype %r not supported" % filetype)
336            self.idmap[ID] = self.theSession.OpenShapefile(filename)
337    
338        def start_derivedshapesource(self, name, qname, attrs):
339            attrs = self.check_attrs(name, attrs,
340                                     [AttrDesc("id", True),
341                                      AttrDesc("shapesource", True,
342                                               conversion = "shapesource"),
343                                      AttrDesc("table", True, conversion="table")])
344            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
345            self.theSession.AddShapeStore(store)
346            self.idmap[attrs["id"]] = store
347    
348        def start_filetable(self, name, qname, attrs):
349            attrs = self.check_attrs(name, attrs,
350                                     [AttrDesc("id", True),
351                                      AttrDesc("title", True),
352                                      AttrDesc("filename", True,
353                                               conversion = "filename"),
354                                      AttrDesc("filetype")])
355            filetype = attrs["filetype"]
356            if filetype != "DBF":
357                raise LoadError("shapesource filetype %r not supported" % filetype)
358            table = DBFTable(attrs["filename"])
359            table.SetTitle(attrs["title"])
360            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
361    
362        def start_jointable(self, name, qname, attrs):
363            attrs = self.check_attrs(name, attrs,
364                                     [AttrDesc("id", True),
365                                      AttrDesc("title", True),
366                                      AttrDesc("left", True, conversion="table"),
367                                      AttrDesc("leftcolumn", True),
368                                      AttrDesc("right", True, conversion="table"),
369                                      AttrDesc("rightcolumn", True),
370    
371                                      # jointype is required for file
372                                      # version 0.9 but this attribute
373                                      # wasn't in the 0.8 version because of
374                                      # an oversight so we assume it's
375                                      # optional since we want to handle
376                                      # both file format versions here.
377                                      AttrDesc("jointype", False,
378                                               default="INNER")])
379    
380            jointype = attrs["jointype"]
381            if jointype == "LEFT OUTER":
382                outer_join = True
383            elif jointype == "INNER":
384                outer_join = False
385            else:
386                raise LoadError("jointype %r not supported" % jointype )
387            table = TransientJoinedTable(self.theSession.TransientDB(),
388                                         attrs["left"], attrs["leftcolumn"],
389                                         attrs["right"], attrs["rightcolumn"],
390                                         outer_join = outer_join)
391            table.SetTitle(attrs["title"])
392            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
393    
394      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
395          """Start a map."""          """Start a map."""
396          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
     start_dispatcher['map'] = "start_map"  
397    
398      def end_map(self, name, qname):      def end_map(self, name, qname):
399          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
400      end_dispatcher['map'] = "end_map"          self.aMap = None
401    
402      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
403          self.ProjectionParams = [ ]          attrs = self.check_attrs(name, attrs,
404      start_dispatcher['projection'] = "start_projection"                                   [AttrDesc("name", conversion=self.encode),
405                                      AttrDesc("epsg", default=None,
406                                               conversion=self.encode)])
407            self.projection_name = attrs["name"]
408            self.projection_epsg = attrs["epsg"]
409            self.projection_params = [ ]
410    
411      def end_projection(self, name, qname):      def end_projection(self, name, qname):
412          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
413      end_dispatcher['projection'] = "end_projection"              obj = self.aLayer
414            elif self.aMap is not None:
415                obj = self.aMap
416            else:
417                assert False, "projection tag out of context"
418                pass
419    
420            obj.SetProjection(Projection(self.projection_params,
421                                         self.projection_name,
422                                         epsg = self.projection_epsg))
423    
424      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
425          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
426          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
427          self.ProjectionParams.append(s)          self.projection_params.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
428    
429      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
430          """Start a layer          """Start a layer
# Line 139  class ProcessSession(xml.sax.handler.Con Line 433  class ProcessSession(xml.sax.handler.Con
433          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
434          object and bind it to self.aLayer.          object and bind it to self.aLayer.
435          """          """
436          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
437          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
438          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
439            filename = self.encode(filename)
440            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
441          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
442          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
443          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
444          self.aLayer = layer_class(title, filename, fill = fill,          if attrs.has_key((None, "shapestore")):
445                                    stroke = stroke, stroke_width = stroke_width)              store = self.idmap[attrs[(None, "shapestore")]]
446      start_dispatcher['layer'] = "start_layer"          else:
447                store = self.theSession.OpenShapefile(filename)
448            self.aLayer = layer_class(title, store,
449                                      fill = fill, stroke = stroke,
450                                      lineWidth = stroke_width,
451                                      visible = visible)
452    
453      def end_layer(self, name, qname):      def end_layer(self, name, qname):
454          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
455      end_dispatcher['layer'] = "end_layer"          self.aLayer = None
456    
457        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
458            title = self.encode(attrs.get((None, 'title'), ""))
459            filename = attrs.get((None, 'filename'), "")
460            filename = os.path.join(self.GetDirectory(), filename)
461            filename = self.encode(filename)
462            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
463    
464            self.aLayer = layer_class(title, filename, visible = visible)
465    
466        def end_rasterlayer(self, name, qname):
467            self.aMap.AddLayer(self.aLayer)
468            self.aLayer = None
469    
470      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
471          self.aLayer.classification.SetField(attrs.get((None, 'field'), None))          attrs = self.check_attrs(name, attrs,
472      start_dispatcher['classification'] = "start_classification"                                   [AttrDesc("field", True),
473                                      AttrDesc("field_type", True)])
474            field = attrs["field"]
475            fieldType = attrs["field_type"]
476    
477            dbFieldType = self.aLayer.GetFieldType(field)
478    
479            if fieldType != dbFieldType:
480                raise ValueError(_("xml field type differs from database!"))
481    
482            # setup conversion routines depending on the kind of data
483            # we will be seeing later on
484            if fieldType == FIELDTYPE_STRING:
485                self.conv = str
486            elif fieldType == FIELDTYPE_INT:
487                self.conv = lambda p: int(float(p))
488            elif fieldType == FIELDTYPE_DOUBLE:
489                self.conv = float
490    
491            self.aLayer.SetClassificationColumn(field)
492    
493      def end_classification(self, name, qname):      def end_classification(self, name, qname):
494          pass          pass
     end_dispatcher['classification'] = "end_classification"  
495    
496      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
497          self.cl_data = ClassData()          self.cl_group = ClassGroupDefault()
498      start_dispatcher['clnull'] = "start_clnull"          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
499            self.cl_prop = ClassGroupProperties()
500    
501      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
502          self.aLayer.classification.SetDefaultData(self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
503          del self.cl_data          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
504      end_dispatcher['clnull'] = "end_clnull"          del self.cl_group, self.cl_prop
505    
506      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
507          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
508    
509          try:          field = self.aLayer.GetClassificationColumn()
510              self.cl_value  = int(attrib_value)          if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
511          except:              value = self.encode(attrib_value)
512              self.cl_value  = attrib_value          else:
513                value = self.conv(attrib_value)
514            self.cl_group = ClassGroupSingleton(value)
515            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
516            self.cl_prop = ClassGroupProperties()
517    
         self.cl_data = ClassData()  
     start_dispatcher['clpoint'] = "start_clpoint"  
518    
519      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
520          self.aLayer.classification.AddPoint(self.cl_value, self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
521          del self.cl_value, self.cl_data          self.aLayer.GetClassification().AppendGroup(self.cl_group)
522      end_dispatcher['clpoint'] = "end_clpoint"          del self.cl_group, self.cl_prop
523    
524      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
525    
526            range = attrs.get((None, 'range'), None)
527            # for backward compatibility (min/max are not saved)
528            min   = attrs.get((None, 'min'), None)
529            max   = attrs.get((None, 'max'), None)
530    
531          try:          try:
532              self.cl_low = int(attrs.get((None, 'low'), "0"))              if range is not None:
533              self.cl_high = int(attrs.get((None, 'high'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
534                elif min is not None and max is not None:
535                    self.cl_group = ClassGroupRange((self.conv(min),
536                                                     self.conv(max)))
537                else:
538                    self.cl_group = ClassGroupRange(Range(None))
539    
540          except ValueError:          except ValueError:
541              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
542    
543          self.cl_data = ClassData()          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
544      start_dispatcher['clrange'] = "start_clrange"          self.cl_prop = ClassGroupProperties()
545    
546    
547      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
548          self.aLayer.classification.AddRange(          self.cl_group.SetProperties(self.cl_prop)
549              self.cl_low, self.cl_high, self.cl_data)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
550          del self.cl_low, self.cl_high, self.cl_data          del self.cl_group, self.cl_prop
     end_dispatcher['clrange'] = "end_clrange"  
551    
552      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
553          self.cl_data.SetStroke(parse_color(attrs.get((None, 'stroke'), "None")))          self.cl_prop.SetLineColor(
554          self.cl_data.SetStrokeWidth(              parse_color(attrs.get((None, 'stroke'), "None")))
555            self.cl_prop.SetLineWidth(
556              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
557          self.cl_data.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetSize(int(attrs.get((None, 'size'), "5")))
558      start_dispatcher['cldata'] = "start_cldata"          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
559    
560      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
561          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"  
562    
563      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
564          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
565    
566      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
567          x = float(attrs[(None, 'x')])          attrs = self.check_attrs(name, attrs,
568          y = float(attrs[(None, 'y')])                                   [AttrDesc("x", True, conversion = float),
569          text = attrs[(None, 'text')]                                    AttrDesc("y", True, conversion = float),
570          halign = attrs[(None, 'halign')]                                    AttrDesc("text", True),
571          valign = attrs[(None, 'valign')]                                    AttrDesc("halign", True,
572                                               conversion = "ascii"),
573                                      AttrDesc("valign", True,
574                                               conversion = "ascii")])
575            x = attrs['x']
576            y = attrs['y']
577            text = attrs['text']
578            halign = attrs['halign']
579            valign = attrs['valign']
580            if halign not in ("left", "center", "right"):
581                raise LoadError("Unsupported halign value %r" % halign)
582            if valign not in ("top", "center", "bottom"):
583                raise LoadError("Unsupported valign value %r" % valign)
584          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"  
585    
586      def characters(self, chars):      def characters(self, chars):
587          pass          pass
588    
589    
590  def load_session(filename):  def load_session(filename, db_connection_callback = None):
591      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file
592      dir = os.path.dirname(filename)  
593      file = open(filename)      The db_connection_callback, if given should be a callable object
594      handler = ProcessSession(dir)      that can be called like this:
595           db_connection_callback(params, message)
596      parser = make_parser()  
597      parser.setContentHandler(handler)      where params is a dictionary containing the known connection
598      parser.setErrorHandler(ErrorHandler())      parameters and message is a string with a message why the connection
599      parser.setFeature(xml.sax.handler.feature_namespaces, 1)      failed. db_connection_callback should return a new dictionary with
600      parser.parse(file)      corrected and perhaps additional parameters like a password or None
601        to indicate that the user cancelled.
602        """
603        handler = SessionLoader(db_connection_callback)
604        handler.read(filename)
605    
606      session = handler.theSession      session = handler.theSession
607      # Newly loaded session aren't modified      # Newly loaded session aren't modified
608      session.UnsetModified()      session.UnsetModified()
609    
610        handler.Destroy()
611    
612      return session      return session
613    
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