/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 614 by jonathan, Mon Apr 7 08:56:38 2003 UTC revision 2615 by jonathan, Fri May 6 14:17:03 2005 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]>  # Jonathan Coles <[email protected]>
6    # Frank Koormann <[email protected]>
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # Read the file COPYING coming with GRASS for details.  # Read the file COPYING coming with GRASS for details.
# Line 13  Parser for thuban session files. Line 14  Parser for thuban session files.
14    
15  __version__ = "$Revision$"  __version__ = "$Revision$"
16    
17  import sys, string, os  import string, os
18    
19  import xml.sax  import xml.sax
20  import xml.sax.handler  import xml.sax.handler
21  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
22    
23  from Thuban import _  from Thuban import _
 from Thuban.common import *  
24    
25  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
26       FIELDTYPE_STRING       FIELDTYPE_STRING
27    
28    from Thuban.Model.color import Color, Transparent
29    
30  from Thuban.Model.session import Session  from Thuban.Model.session import Session
31  from Thuban.Model.map import Map  from Thuban.Model.map import Map
32  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer, RasterLayer
 from Thuban.Model.color import Color  
33  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
34    from Thuban.Model.range import Range
35  from Thuban.Model.classification import Classification, \  from Thuban.Model.classification import Classification, \
36      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
37      ClassGroupProperties      ClassGroupProperties
38    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
39    from Thuban.Model.table import DBFTable
40    from Thuban.Model.transientdb import TransientJoinedTable
41    
42    from Thuban.Model.xmlreader import XMLReader
43    import resource
44    
45    import postgisdb
46    
47    class LoadError(Exception):
48    
49        """Exception raised when the thuban file is corrupted
50    
51        Not all cases of corrupted thuban files will lead to this exception
52        but those that are found by checks in the loading code itself are.
53        """
54    
55    
56    class LoadCancelled(Exception):
57    
58        """Exception raised to indicate that loading was interrupted by the user"""
59    
60    
61  def parse_color(color):  def parse_color(color):
# Line 43  def parse_color(color): Line 66  def parse_color(color):
66      """      """
67      color = string.strip(color)      color = string.strip(color)
68      if color == "None":      if color == "None":
69          result = Color.Transparent          result = Transparent
70      elif color[0] == '#':      elif color[0] == '#':
71          if len(color) == 7:          if len(color) == 7:
72              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 80  def parse_color(color):
80          raise ValueError(_("Invalid color specification %s") % color)          raise ValueError(_("Invalid color specification %s") % color)
81      return result      return result
82    
83    class AttrDesc:
84    
85  class ProcessSession(xml.sax.handler.ContentHandler):      def __init__(self, name, required = False, default = "",
86                     conversion = None):
87            if not isinstance(name, tuple):
88                fullname = (None, name)
89            else:
90                fullname = name
91                name = name[1]
92            self.name = name
93            self.fullname = fullname
94            self.required = required
95            self.default = default
96            self.conversion = conversion
97    
98            # set by the SessionLoader's check_attrs method
99            self.value = None
100    
101    
102    class SessionLoader(XMLReader):
103    
104        def __init__(self, db_connection_callback = None,
105                           shapefile_callback = None):
106            """Inititialize the Sax handler."""
107            XMLReader.__init__(self)
108    
109      # Dictionary mapping element names (or (URI, element name) pairs for          self.db_connection_callback = db_connection_callback
110      # documents using namespaces) to method names. The methods should          self.shapefile_callback = shapefile_callback
     # 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 = ''  
111          self.theSession = None          self.theSession = None
112          self.aMap = None          self.aMap = None
113          self.aLayer = None          self.aLayer = None
114    
115      def startElementNS(self, name, qname, attrs):          # Map ids used in the thuban file to the corresponding objects
116          """Call the method given for name in self.start_dispatcher          # in the session
117            self.idmap = {}
118    
119            dispatchers = {
120                'session'       : ("start_session",        "end_session"),
121    
122                'dbconnection': ("start_dbconnection", None),
123    
124                'dbshapesource': ("start_dbshapesource", None),
125                'fileshapesource': ("start_fileshapesource", None),
126                'derivedshapesource': ("start_derivedshapesource", None),
127                'filetable': ("start_filetable", None),
128                'jointable': ("start_jointable", None),
129    
130                'map'           : ("start_map",            "end_map"),
131                'projection'    : ("start_projection",     "end_projection"),
132                'parameter'     : ("start_parameter",      None),
133                'layer'         : ("start_layer",          "end_layer"),
134                'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
135                'classification': ("start_classification", "end_classification"),
136                'clnull'        : ("start_clnull",         "end_clnull"),
137                'clpoint'       : ("start_clpoint",        "end_clpoint"),
138                'clrange'       : ("start_clrange",        "end_clrange"),
139                'cldata'        : ("start_cldata",         "end_cldata"),
140                'table'         : ("start_table",          "end_table"),
141                'labellayer'    : ("start_labellayer",     None),
142                'label'         : ("start_label",          None)}
143    
144            # all dispatchers should be used for the 0.8 and 0.9 namespaces too
145            for xmlns in ("http://thuban.intevation.org/dtds/thuban-0.8.dtd",
146                          "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd",
147                          "http://thuban.intevation.org/dtds/thuban-0.9.dtd",
148                          "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd",
149                          "http://thuban.intevation.org/dtds/thuban-1.0rc1.dtd",
150                          "http://thuban.intevation.org/dtds/thuban-1.0.0.dtd",
151                          "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"):
152                for key, value in dispatchers.items():
153                    dispatchers[(xmlns, key)] = value
154    
155            XMLReader.AddDispatchers(self, dispatchers)
156    
157        def Destroy(self):
158            """Clear all instance variables to cut cyclic references.
159    
160            The GC would have collected the loader eventually but it can
161            happen that it doesn't run at all until Thuban is closed (2.3
162            but not 2.2 tries a bit harder and forces a collection when the
163            interpreter terminates)
164          """          """
165          if name[0] is None:          self.__dict__.clear()
             method_name = self.start_dispatcher.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.start_dispatcher.get(name)  
         if method_name is not None:  
             getattr(self, method_name)(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.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)  
166    
167      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
168          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'),
169      start_dispatcher['session'] = "start_session"                                                          None)))
170    
171      def end_session(self, name, qname):      def end_session(self, name, qname):
172          pass          pass
173      end_dispatcher['session'] = "end_session"  
174        def check_attrs(self, element, attrs, descr):
175            """Check and convert some of the attributes of an element
176    
177            Parameters:
178               element -- The element name
179               attrs -- The attrs mapping as passed to the start_* methods
180               descr -- Sequence of attribute descriptions (AttrDesc instances)
181    
182            Return a dictionary containig normalized versions of the
183            attributes described in descr. The keys of that dictionary are
184            the name attributes of the attribute descriptions. The attrs
185            dictionary will not be modified.
186    
187            If the attribute is required, i.e. the 'required' attribute of
188            the descrtiption is true, but it is not in attrs, raise a
189            LoadError.
190    
191            If the attribute has a default value and it is not present in
192            attrs, use that default value as the value in the returned dict.
193    
194            The value is converted before putting it into the returned dict.
195            The following conversions are available:
196    
197               'filename' -- The attribute is a filename.
198    
199                             If the filename is a relative name, interpret
200                             it relative to the directory containing the
201                             .thuban file and make it an absolute name
202    
203               'shapestore' -- The attribute is the ID of a shapestore
204                               defined earlier in the .thuban file. Look it
205                               up self.idmap
206    
207               'table' -- The attribute is the ID of a table or shapestore
208                          defined earlier in the .thuban file. Look it up
209                          self.idmap. If it's the ID of a shapestore the
210                          value will be the table of the shapestore.
211    
212               'idref' -- The attribute is the id of an object defined
213                          earlier in the .thuban file. Look it up self.idmap
214    
215               'ascii' -- The attribute is converted to a bytestring with
216                          ascii encoding.
217    
218               a callable -- The attribute value is passed to the callable
219                             and the return value is used as the converted
220                             value
221    
222            If no conversion is specified for an attribute it is converted
223            with self.encode.
224            """
225            normalized = {}
226    
227            for d in descr:
228                if d.required and not attrs.has_key(d.fullname):
229                    raise LoadError("Element %s requires an attribute %r"
230                                    % (element, d.name))
231                value = attrs.get(d.fullname, d.default)
232    
233                if d.conversion in ("idref", "shapesource"):
234                    if value in self.idmap:
235                        value = self.idmap[value]
236                    else:
237                        raise LoadError("Element %s requires an already defined ID"
238                                        " in attribute %r"
239                                        % (element, d.name))
240                elif d.conversion == "table":
241                    if value in self.idmap:
242                        value = self.idmap[value]
243                        if isinstance(value, ShapefileStore):
244                            value = value.Table()
245                    else:
246                        raise LoadError("Element %s requires an already defined ID"
247                                        " in attribute %r"
248                                        % (element, d.name))
249                elif d.conversion == "filename":
250                    value = os.path.abspath(os.path.join(self.GetDirectory(),
251                                                         value))
252                elif d.conversion == "ascii":
253                    value = value.encode("ascii")
254                elif d.conversion:
255                    # Assume it's a callable
256                    value = d.conversion(value)
257                else:
258                   value = self.encode(value)
259    
260                normalized[d.name] = value
261            return normalized
262    
263        def open_shapefile(self, filename):
264            """Open shapefile, with alternative path handling.
265            
266               If a shapefile cannot be opened and an IOError is raised, check for
267               an alternative. This alternative can be specified interactively by
268               the user or taken from a list of (potential) locations, depending on
269               the callback implementation.
270                
271               The alternative is rechecked. If taken from a list the user
272               has to confirm the alternative.
273            """
274    
275            # Flag if the alternative path was specified interactively / from list.
276            from_list = 0
277            while 1:
278                try:
279                    store = self.theSession.OpenShapefile(filename)
280                    if from_list:
281                        # A valid path has been guessed from a list
282                        # Let the user confirm - or select an alternative.
283                        filename, from_list = self.shapefile_callback(
284                                                filename, "check")
285                        if filename is None:
286                            # Selection cancelled
287                            raise LoadCancelled
288                        elif store.FileName() == filename:
289                            # Proposed file has been accepted
290                            break
291                        else:
292                            # the filename has been changed, try the new file
293                            pass
294                    else:
295                        break
296                except IOError:
297                    if self.shapefile_callback is not None:
298                        filename, from_list = self.shapefile_callback(
299                                                filename,
300                                                mode = "search",
301                                                second_try = from_list)
302                        if filename is None:
303                            raise LoadCancelled
304                    else:
305                        raise
306            return store
307    
308        def start_dbconnection(self, name, qname, attrs):
309            attrs = self.check_attrs(name, attrs,
310                                     [AttrDesc("id", True),
311                                      AttrDesc("dbtype", True),
312                                      AttrDesc("host", False, ""),
313                                      AttrDesc("port", False, ""),
314                                      AttrDesc("user", False, ""),
315                                      AttrDesc("dbname", True)])
316            ID = attrs["id"]
317            dbtype = attrs["dbtype"]
318            if dbtype != "postgis":
319                raise LoadError("dbtype %r not supported" % filetype)
320    
321            del attrs["id"]
322            del attrs["dbtype"]
323    
324            # Try to open the connection and if it fails ask the user for
325            # the correct parameters repeatedly.
326            # FIXME: it would be better not to insist on getting a
327            # connection here. We should handle this more like the raster
328            # images where the layers etc still are created but are not
329            # drawn in case Thuban can't use the data for various reasons
330            while 1:
331                try:
332                    conn = postgisdb.PostGISConnection(**attrs)
333                    break
334                except postgisdb.ConnectionError, val:
335                    if self.db_connection_callback is not None:
336                        attrs = self.db_connection_callback(attrs, str(val))
337                        if attrs is None:
338                            raise LoadCancelled
339                    else:
340                        raise
341    
342            self.idmap[ID] = conn
343            self.theSession.AddDBConnection(conn)
344    
345        def start_dbshapesource(self, name, qname, attrs):
346            attrs = self.check_attrs(name, attrs,
347                                     [AttrDesc("id", True),
348                                      AttrDesc("dbconn", True,
349                                               conversion = "idref"),
350                                      AttrDesc("tablename", True,
351                                               conversion = "ascii"),
352                                      # id_column and geometry_column were
353                                      # newly introduced with thuban-1.1.dtd
354                                      # where they're required.  Since we
355                                      # support the older formats too we
356                                      # have them optional here.
357                                      AttrDesc("id_column", False, "gid",
358                                               conversion = "ascii"),
359                                      AttrDesc("geometry_column", False,
360                                               conversion = "ascii")])
361            # The default value of geometry_column to use when instantiating
362            # the db shapestore is None which we currently can't easily use
363            # in check_attrs
364            geometry_column = attrs["geometry_column"]
365            if not geometry_column:
366                geometry_column = None
367            dbopen = self.theSession.OpenDBShapeStore
368            self.idmap[attrs["id"]] = dbopen(attrs["dbconn"], attrs["tablename"],
369                                             id_column = attrs["id_column"],
370                                             geometry_column=geometry_column)
371    
372        def start_fileshapesource(self, name, qname, attrs):
373            attrs = self.check_attrs(name, attrs,
374                                      [AttrDesc("id", True),
375                                       AttrDesc("filename", True,
376                                                conversion = "filename"),
377                                       AttrDesc("filetype", True)])
378            ID = attrs["id"]
379            filename = attrs["filename"]
380            filetype = attrs["filetype"]
381            if filetype != "shapefile":
382                raise LoadError("shapesource filetype %r not supported" % filetype)
383            self.idmap[ID] = self.open_shapefile(filename)
384    
385        def start_derivedshapesource(self, name, qname, attrs):
386            attrs = self.check_attrs(name, attrs,
387                                     [AttrDesc("id", True),
388                                      AttrDesc("shapesource", True,
389                                               conversion = "shapesource"),
390                                      AttrDesc("table", True, conversion="table")])
391            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
392            self.theSession.AddShapeStore(store)
393            self.idmap[attrs["id"]] = store
394    
395        def start_filetable(self, name, qname, attrs):
396            attrs = self.check_attrs(name, attrs,
397                                     [AttrDesc("id", True),
398                                      AttrDesc("title", True),
399                                      AttrDesc("filename", True,
400                                               conversion = "filename"),
401                                      AttrDesc("filetype")])
402            filetype = attrs["filetype"]
403            if filetype != "DBF":
404                raise LoadError("shapesource filetype %r not supported" % filetype)
405            table = DBFTable(attrs["filename"])
406            table.SetTitle(attrs["title"])
407            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
408    
409        def start_jointable(self, name, qname, attrs):
410            attrs = self.check_attrs(name, attrs,
411                                     [AttrDesc("id", True),
412                                      AttrDesc("title", True),
413                                      AttrDesc("left", True, conversion="table"),
414                                      AttrDesc("leftcolumn", True),
415                                      AttrDesc("right", True, conversion="table"),
416                                      AttrDesc("rightcolumn", True),
417    
418                                      # jointype is required for file
419                                      # version 0.9 but this attribute
420                                      # wasn't in the 0.8 version because of
421                                      # an oversight so we assume it's
422                                      # optional since we want to handle
423                                      # both file format versions here.
424                                      AttrDesc("jointype", False,
425                                               default="INNER")])
426    
427            jointype = attrs["jointype"]
428            if jointype == "LEFT OUTER":
429                outer_join = True
430            elif jointype == "INNER":
431                outer_join = False
432            else:
433                raise LoadError("jointype %r not supported" % jointype )
434            table = TransientJoinedTable(self.theSession.TransientDB(),
435                                         attrs["left"], attrs["leftcolumn"],
436                                         attrs["right"], attrs["rightcolumn"],
437                                         outer_join = outer_join)
438            table.SetTitle(attrs["title"])
439            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
440    
441      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
442          """Start a map."""          """Start a map."""
443          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
     start_dispatcher['map'] = "start_map"  
444    
445      def end_map(self, name, qname):      def end_map(self, name, qname):
446          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
447      end_dispatcher['map'] = "end_map"          self.aMap = None
448    
449      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
450          self.ProjectionParams = [ ]          attrs = self.check_attrs(name, attrs,
451      start_dispatcher['projection'] = "start_projection"                                   [AttrDesc("name", conversion=self.encode),
452                                      AttrDesc("epsg", default=None,
453                                               conversion=self.encode)])
454            self.projection_name = attrs["name"]
455            self.projection_epsg = attrs["epsg"]
456            self.projection_params = [ ]
457    
458      def end_projection(self, name, qname):      def end_projection(self, name, qname):
459          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
460      end_dispatcher['projection'] = "end_projection"              obj = self.aLayer
461            elif self.aMap is not None:
462                obj = self.aMap
463            else:
464                assert False, "projection tag out of context"
465                pass
466    
467            obj.SetProjection(Projection(self.projection_params,
468                                         self.projection_name,
469                                         epsg = self.projection_epsg))
470    
471      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
472          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
473          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
474          self.ProjectionParams.append(s)          self.projection_params.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
475    
476      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
477          """Start a layer          """Start a layer
# Line 147  class ProcessSession(xml.sax.handler.Con Line 480  class ProcessSession(xml.sax.handler.Con
480          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
481          object and bind it to self.aLayer.          object and bind it to self.aLayer.
482          """          """
483          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
484          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
485          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
486            filename = self.encode(filename)
487            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
488          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
489          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
490          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
491          self.aLayer = layer_class(title, filename, fill = fill,          if attrs.has_key((None, "shapestore")):
492                                    stroke = stroke, lineWidth = stroke_width)              store = self.idmap[attrs[(None, "shapestore")]]
493      start_dispatcher['layer'] = "start_layer"          else:
494                store = self.open_shapefile(filename)
495    
496            self.aLayer = layer_class(title, store,
497                                      fill = fill, stroke = stroke,
498                                      lineWidth = stroke_width,
499                                      visible = visible)
500    
501      def end_layer(self, name, qname):      def end_layer(self, name, qname):
502          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
503      end_dispatcher['layer'] = "end_layer"          self.aLayer = None
504    
505        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
506            title = self.encode(attrs.get((None, 'title'), ""))
507            filename = attrs.get((None, 'filename'), "")
508            filename = os.path.join(self.GetDirectory(), filename)
509            filename = self.encode(filename)
510            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
511            opacity  = float(attrs.get((None, 'opacity'), "1"))
512            masktype = str(attrs.get((None, 'masktype'), "bit"))
513    
514            masktypes = {"none": layer_class.MASK_NONE,
515                         "bit":  layer_class.MASK_BIT,
516                         "alpha": layer_class.MASK_ALPHA}
517    
518            self.aLayer = layer_class(title, filename,
519                                      visible = visible,
520                                      opacity = opacity,
521                                      masktype = masktypes[masktype])
522    
523        def end_rasterlayer(self, name, qname):
524            self.aMap.AddLayer(self.aLayer)
525            self.aLayer = None
526    
527      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
528          field = attrs.get((None, 'field'), None)          attrs = self.check_attrs(name, attrs,
529                                     [AttrDesc("field", True),
530                                      AttrDesc("field_type", True)])
531            field = attrs["field"]
532            fieldType = attrs["field_type"]
533    
         fieldType = attrs.get((None, 'field_type'), None)  
534          dbFieldType = self.aLayer.GetFieldType(field)          dbFieldType = self.aLayer.GetFieldType(field)
535    
536          if fieldType != dbFieldType:          if fieldType != dbFieldType:
# Line 179  class ProcessSession(xml.sax.handler.Con Line 545  class ProcessSession(xml.sax.handler.Con
545          elif fieldType == FIELDTYPE_DOUBLE:          elif fieldType == FIELDTYPE_DOUBLE:
546              self.conv = float              self.conv = float
547    
548          self.aLayer.GetClassification().SetField(field)          self.aLayer.SetClassificationColumn(field)
   
     start_dispatcher['classification'] = "start_classification"  
549    
550      def end_classification(self, name, qname):      def end_classification(self, name, qname):
551          pass          pass
     end_dispatcher['classification'] = "end_classification"  
552    
553      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
554          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
555          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
556          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
     start_dispatcher['clnull'] = "start_clnull"  
557    
558      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
559          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
560          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
561          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clnull'] = "end_clnull"  
562    
563      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
564          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
565    
566          #try:          field = self.aLayer.GetClassificationColumn()
567              #value  = Str2Num(attrib_value)          if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
568          #except:              value = self.encode(attrib_value)
569              #value  = attrib_value          else:
570                value = self.conv(attrib_value)
         value = self.conv(attrib_value)  
   
571          self.cl_group = ClassGroupSingleton(value)          self.cl_group = ClassGroupSingleton(value)
572          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
573          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
574    
     start_dispatcher['clpoint'] = "start_clpoint"  
575    
576      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
577          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
578          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
579          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clpoint'] = "end_clpoint"  
580    
581      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
582    
583            range = attrs.get((None, 'range'), None)
584            # for backward compatibility (min/max are not saved)
585            min   = attrs.get((None, 'min'), None)
586            max   = attrs.get((None, 'max'), None)
587    
588          try:          try:
589              min = self.conv(attrs.get((None, 'min'), "0"))              if range is not None:
590              max = self.conv(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
591              #min = Str2Num(attrs.get((None, 'min'), "0"))              elif min is not None and max is not None:
592              #max = Str2Num(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange((self.conv(min),
593                                                     self.conv(max)))
594                else:
595                    self.cl_group = ClassGroupRange(Range(None))
596    
597          except ValueError:          except ValueError:
598              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
599    
         self.cl_group = ClassGroupRange(min, max)  
600          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
601          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
602    
     start_dispatcher['clrange'] = "start_clrange"  
603    
604      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
605          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
606          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
607          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clrange'] = "end_clrange"  
608    
609      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
610          self.cl_prop.SetLineColor(          self.cl_prop.SetLineColor(
611              parse_color(attrs.get((None, 'stroke'), "None")))              parse_color(attrs.get((None, 'stroke'), "None")))
612          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
613              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
614            self.cl_prop.SetSize(int(attrs.get((None, 'size'), "5")))
615          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
     start_dispatcher['cldata'] = "start_cldata"  
616    
617      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
618          pass          pass
     end_dispatcher['cldata'] = "end_cldata"  
   
     def start_table(self, name, qname, attrs):  
         #print "table title: %s" % attrs.get('title', None)  
         pass  
     start_dispatcher['table'] = "start_table"  
   
     def end_table(self, name, qname):  
         pass  
     end_dispatcher['table'] = "end_table"  
619    
620      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
621          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
622    
623      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
624          x = float(attrs[(None, 'x')])          attrs = self.check_attrs(name, attrs,
625          y = float(attrs[(None, 'y')])                                   [AttrDesc("x", True, conversion = float),
626          text = attrs[(None, 'text')]                                    AttrDesc("y", True, conversion = float),
627          halign = attrs[(None, 'halign')]                                    AttrDesc("text", True),
628          valign = attrs[(None, 'valign')]                                    AttrDesc("halign", True,
629                                               conversion = "ascii"),
630                                      AttrDesc("valign", True,
631                                               conversion = "ascii")])
632            x = attrs['x']
633            y = attrs['y']
634            text = attrs['text']
635            halign = attrs['halign']
636            valign = attrs['valign']
637            if halign not in ("left", "center", "right"):
638                raise LoadError("Unsupported halign value %r" % halign)
639            if valign not in ("top", "center", "bottom"):
640                raise LoadError("Unsupported valign value %r" % valign)
641          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"  
642    
643      def characters(self, chars):      def characters(self, chars):
644          pass          pass
645    
646    
647  def load_session(filename):  def load_session(filename, db_connection_callback = None,
648      """Load a Thuban session from the file object file"""                             shapefile_callback = None):
649      dir = os.path.dirname(filename)      """Load a Thuban session from the file object file
650      file = open(filename)  
651      handler = ProcessSession(dir)      The db_connection_callback, if given should be a callable object
652        that can be called like this:
653      parser = make_parser()         db_connection_callback(params, message)
654      parser.setContentHandler(handler)  
655      parser.setErrorHandler(ErrorHandler())      where params is a dictionary containing the known connection
656      parser.setFeature(xml.sax.handler.feature_namespaces, 1)      parameters and message is a string with a message why the connection
657        failed. db_connection_callback should return a new dictionary with
658      #      corrected and perhaps additional parameters like a password or None
659      # Well, this isn't pretty, but it appears that if you      to indicate that the user cancelled.
660      # use Python 2.2 without the site-package _xmlplus then      """
661      # the following will fail, and without them it will work.      handler = SessionLoader(db_connection_callback, shapefile_callback)
662      # However, if you do have the site-package and you don't      handler.read(filename)
     # 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:  
         parser.setFeature(xml.sax.handler.feature_validation, 0)  
         parser.setFeature(xml.sax.handler.feature_external_ges, 0)  
         parser.setFeature(xml.sax.handler.feature_external_pes, 0)  
     except SAXNotRecognizedException:  
         pass  
   
     parser.parse(file)  
663    
664      session = handler.theSession      session = handler.theSession
665      # Newly loaded session aren't modified      # Newly loaded session aren't modified
666      session.UnsetModified()      session.UnsetModified()
667    
668        handler.Destroy()
669    
670      return session      return session
671    
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