/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 75 by bh, Mon Feb 4 19:22:22 2002 UTC revision 1970 by bh, Mon Nov 24 18:36:00 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]>
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 11  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
19    import xml.sax.handler
20    from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21    
22    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.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  oldPython=0  from Thuban.Model.xmlreader import XMLReader
42    import resource
43    
44  if not sys.__dict__.has_key("version_info"):  import postgisdb
     # We can assume to have python 1.5.2 or lower here now  
     oldPython=1  
   
 if oldPython:  
     try:  
         from xml.sax.saxexts import make_parser  
         from xml.sax.saxlib import HandlerBase  
         from xml.sax import saxutils  
     except ImportError:  
         sys.stdout.write(("You need to have Python-XML installed or"  
                           " a modern Python!\n"  
                           "Check www.python.org/sigs/xml-sig/\n\n"))  
         raise  
 else:  
     # Do the python 2.0 standard xml thing and map it on the old names  
     import xml.sax  
     import xml.sax.handler  
     HandlerBase=xml.sax.handler.ContentHandler  
     from xml.sax import make_parser  
   
 class testSAXContentHandler(HandlerBase):  
 # SAX compliant  
     def characters(self, ch, start, length):  
         pass  
       
 def test_for_broken_SAX():  
     ch=testSAXContentHandler()  
     try:  
         xml.sax.parseString("""<?xml version="1.0"?>  
             <child1 name="paul">Text goes here</child1>  
         """,ch)  
     except TypeError:  
         return 1  
     return 0  
45    
46    class LoadError(Exception):
47    
48  def parse_color(color):      """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      Return the color object for the string color. Color may be either  
54      'None' or of the form '#RRGGBB' in the usual HTML color notation  
55    class LoadCancelled(Exception):
56    
57        """Exception raised to indicate that loading was interrupted by the user"""
58    
59    
60    def parse_color(color):
61        """Return the color object for the string color.
62    
63        Color may be either 'None' or of the form '#RRGGBB' in the usual
64        HTML color notation
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 72  def parse_color(color): Line 73  def parse_color(color):
73              b = string.atoi(color[5:7], 16) / 255.0              b = string.atoi(color[5:7], 16) / 255.0
74              result = Color(r, g, b)              result = Color(r, g, b)
75          else:          else:
76              raise ValueError("Invalid hexadecimal color specification %s"              raise ValueError(_("Invalid hexadecimal color specification %s")
77                               % color)                               % color)
78      else:      else:
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(HandlerBase):      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      def __init__(self, directory):          # set by the SessionLoader's check_attrs method
98          """Inititialize the Sax handler.          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    
         directory is 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 startElement(self, name, attrs):          # Map ids used in the thuban file to the corresponding objects
114          if name == 'session':          # in the session
115              self.theSession = Session(attrs.get('title', None))          self.idmap = {}
116          elif name == 'map':  
117              self.aMap = Map(attrs.get('title', None))          dispatchers = {
118          elif name == 'projection':              'session'       : ("start_session",        "end_session"),
119              self.ProjectionParams = [ ]  
120          elif name == 'parameter':              'dbconnection': ("start_dbconnection", None),
121              self.ProjectionParams.append(attrs.get('value', None))  
122          elif name == 'layer':              'dbshapesource': ("start_dbshapesource", None),
123              title = attrs.get('title', "")              'fileshapesource': ("start_fileshapesource", None),
124              filename = attrs.get('filename', "")              'derivedshapesource': ("start_derivedshapesource", None),
125              filename = os.path.join(self.directory, filename)              'filetable': ("start_filetable", None),
126              fill = parse_color(attrs.get('fill', "None"))              'jointable': ("start_jointable", None),
127              stroke = parse_color(attrs.get('stroke', "#000000"))  
128              stroke_width = int(attrs.get("stroke_width", "1"))              'map'           : ("start_map",            "end_map"),
129              self.aLayer = Layer(title, filename, fill = fill, stroke = stroke,              'projection'    : ("start_projection",     "end_projection"),
130                                  stroke_width = stroke_width)              'parameter'     : ("start_parameter",      None),
131          elif name == 'table':              'layer'         : ("start_layer",          "end_layer"),
132              print "table title: %s" % attrs.get('title', None)              'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
133          elif name == 'labellayer':              'classification': ("start_classification", "end_classification"),
134              self.aLayer = self.aMap.LabelLayer()              'clnull'        : ("start_clnull",         "end_clnull"),
135          elif name == 'label':              'clpoint'       : ("start_clpoint",        "end_clpoint"),
136              x = float(attrs['x'])              'clrange'       : ("start_clrange",        "end_clrange"),
137              y = float(attrs['y'])              'cldata'        : ("start_cldata",         "end_cldata"),
138              text = attrs['text']              'table'         : ("start_table",          "end_table"),
139              halign = attrs['halign']              'labellayer'    : ("start_labellayer",     None),
140              valign = attrs['valign']              'label'         : ("start_label",          None)}
141              self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)  
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      if not oldPython and test_for_broken_SAX():                        "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd",
145          # works with python 2.0, but is not SAX compliant                        "http://thuban.intevation.org/dtds/thuban-0.9.dtd",
146          def characters(self, ch):                        "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"):
147              self.my_characters(ch)              for key, value in dispatchers.items():
148      else:                  dispatchers[(xmlns, key)] = value
149          # SAX compliant  
150          def characters(self, ch, start, length):          XMLReader.AddDispatchers(self, dispatchers)
151              self.my_characters(ch[start:start+length])  
152        def Destroy(self):
153      def my_characters(self, ch):          """Clear all instance variables to cut cyclic references.
154          self.chars = self.chars + ch  
155            The GC would have collected the loader eventually but it can
156      def endElement(self, name):          happen that it doesn't run at all until Thuban is closed (2.3
157          # If it's not a parameter element, ignore it          but not 2.2 tries a bit harder and forces a collection when the
158          if name == 'session':          interpreter terminates)
159              #print "end of session"          """
160              pass          self.__dict__.clear()
161          if name == 'map':  
162              self.theSession.AddMap(self.aMap)      def start_session(self, name, qname, attrs):
163          if name == 'projection':          self.theSession = Session(self.encode(attrs.get((None, 'title'),
164              self.aMap.SetProjection(Projection(self.ProjectionParams))                                                          None)))
165          if name == 'layer':  
166              self.aMap.AddLayer(self.aLayer)      def end_session(self, name, qname):
167          if name == 'table':          pass
168              #print "end of table"  
169        def check_attrs(self, element, attrs, descr):
170            """Check and convert some of the attributes of an element
171    
172            Parameters:
173               element -- The element name
174               attrs -- The attrs mapping as passed to the start_* methods
175               descr -- Sequence of attribute descriptions (AttrDesc instances)
176    
177            Return a dictionary containig normalized versions of the
178            attributes described in descr. The keys of that dictionary are
179            the name attributes of the attribute descriptions. The attrs
180            dictionary will not be modified.
181    
182            If the attribute is required, i.e. the 'required' attribute of
183            the descrtiption is true, but it is not in attrs, raise a
184            LoadError.
185    
186            If the attribute has a default value and it is not present in
187            attrs, use that default value as the value in the returned dict.
188    
189            The value is converted before putting it into the returned dict.
190            The following conversions are available:
191    
192               'filename' -- The attribute is a filename.
193    
194                             If the filename is a relative name, interpret
195                             it relative to the directory containing the
196                             .thuban file and make it an absolute name
197    
198               'shapestore' -- The attribute is the ID of a shapestore
199                               defined earlier in the .thuban file. Look it
200                               up self.idmap
201    
202               'table' -- The attribute is the ID of a table or shapestore
203                          defined earlier in the .thuban file. Look it up
204                          self.idmap. If it's the ID of a shapestore the
205                          value will be the table of the shapestore.
206    
207               'idref' -- The attribute is the id of an object defined
208                          earlier in the .thuban file. Look it up self.idmap
209    
210               'ascii' -- The attribute is converted to a bytestring with
211                          ascii encoding.
212    
213               a callable -- The attribute value is passed to the callable
214                             and the return value is used as the converted
215                             value
216    
217            If no conversion is specified for an attribute it is converted
218            with self.encode.
219            """
220            normalized = {}
221    
222            for d in descr:
223                if d.required and not attrs.has_key(d.fullname):
224                    raise LoadError("Element %s requires an attribute %r"
225                                    % (element, d.name))
226                value = attrs.get(d.fullname, d.default)
227    
228                if d.conversion in ("idref", "shapesource"):
229                    if value in self.idmap:
230                        value = self.idmap[value]
231                    else:
232                        raise LoadError("Element %s requires an already defined ID"
233                                        " in attribute %r"
234                                        % (element, d.name))
235                elif d.conversion == "table":
236                    if value in self.idmap:
237                        value = self.idmap[value]
238                        if isinstance(value, ShapefileStore):
239                            value = value.Table()
240                    else:
241                        raise LoadError("Element %s requires an already defined ID"
242                                        " in attribute %r"
243                                        % (element, d.name))
244                elif d.conversion == "filename":
245                    value = os.path.abspath(os.path.join(self.GetDirectory(),
246                                                         value))
247                elif d.conversion == "ascii":
248                    value = value.encode("ascii")
249                elif d.conversion:
250                    # Assume it's a callable
251                    value = d.conversion(value)
252                else:
253                   value = self.encode(value)
254    
255                normalized[d.name] = value
256            return normalized
257    
258        def start_dbconnection(self, name, qname, attrs):
259            attrs = self.check_attrs(name, attrs,
260                                     [AttrDesc("id", True),
261                                      AttrDesc("dbtype", True),
262                                      AttrDesc("host", False, ""),
263                                      AttrDesc("port", False, ""),
264                                      AttrDesc("user", False, ""),
265                                      AttrDesc("dbname", True)])
266            ID = attrs["id"]
267            dbtype = attrs["dbtype"]
268            if dbtype != "postgis":
269                raise LoadError("dbtype %r not supported" % filetype)
270    
271            del attrs["id"]
272            del attrs["dbtype"]
273    
274            # Try to open the connection and if it fails ask the user for
275            # the correct parameters repeatedly.
276            # FIXME: it would be better not to insist on getting a
277            # connection here. We should handle this more like the raster
278            # images where the layers etc still are created but are not
279            # drawn in case Thuban can't use the data for various reasons
280            while 1:
281                try:
282                    conn = postgisdb.PostGISConnection(**attrs)
283                    break
284                except postgisdb.ConnectionError, val:
285                    if self.db_connection_callback is not None:
286                        attrs = self.db_connection_callback(attrs, str(val))
287                        if attrs is None:
288                            raise LoadCancelled
289                    else:
290                        raise
291    
292            self.idmap[ID] = conn
293            self.theSession.AddDBConnection(conn)
294    
295        def start_dbshapesource(self, name, qname, attrs):
296            attrs = self.check_attrs(name, attrs,
297                                     [AttrDesc("id", True),
298                                      AttrDesc("dbconn", True,
299                                               conversion = "idref"),
300                                      AttrDesc("tablename", True,
301                                               conversion = "ascii")])
302            ID = attrs["id"]
303            db = attrs["dbconn"]
304            tablename = attrs["tablename"]
305            self.idmap[ID] = self.theSession.OpenDBShapeStore(db, tablename)
306    
307        def start_fileshapesource(self, name, qname, attrs):
308            attrs = self.check_attrs(name, attrs,
309                                      [AttrDesc("id", True),
310                                       AttrDesc("filename", True,
311                                                conversion = "filename"),
312                                       AttrDesc("filetype", True)])
313            ID = attrs["id"]
314            filename = attrs["filename"]
315            filetype = attrs["filetype"]
316            if filetype != "shapefile":
317                raise LoadError("shapesource filetype %r not supported" % filetype)
318            self.idmap[ID] = self.theSession.OpenShapefile(filename)
319    
320        def start_derivedshapesource(self, name, qname, attrs):
321            attrs = self.check_attrs(name, attrs,
322                                     [AttrDesc("id", True),
323                                      AttrDesc("shapesource", True,
324                                               conversion = "shapesource"),
325                                      AttrDesc("table", True, conversion="table")])
326            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
327            self.theSession.AddShapeStore(store)
328            self.idmap[attrs["id"]] = store
329    
330        def start_filetable(self, name, qname, attrs):
331            attrs = self.check_attrs(name, attrs,
332                                     [AttrDesc("id", True),
333                                      AttrDesc("title", True),
334                                      AttrDesc("filename", True,
335                                               conversion = "filename"),
336                                      AttrDesc("filetype")])
337            filetype = attrs["filetype"]
338            if filetype != "DBF":
339                raise LoadError("shapesource filetype %r not supported" % filetype)
340            table = DBFTable(attrs["filename"])
341            table.SetTitle(attrs["title"])
342            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
343    
344        def start_jointable(self, name, qname, attrs):
345            attrs = self.check_attrs(name, attrs,
346                                     [AttrDesc("id", True),
347                                      AttrDesc("title", True),
348                                      AttrDesc("left", True, conversion="table"),
349                                      AttrDesc("leftcolumn", True),
350                                      AttrDesc("right", True, conversion="table"),
351                                      AttrDesc("rightcolumn", True),
352    
353                                      # jointype is required for file
354                                      # version 0.9 but this attribute
355                                      # wasn't in the 0.8 version because of
356                                      # an oversight so we assume it's
357                                      # optional since we want to handle
358                                      # both file format versions here.
359                                      AttrDesc("jointype", False,
360                                               default="INNER")])
361    
362            jointype = attrs["jointype"]
363            if jointype == "LEFT OUTER":
364                outer_join = True
365            elif jointype == "INNER":
366                outer_join = False
367            else:
368                raise LoadError("jointype %r not supported" % jointype )
369            table = TransientJoinedTable(self.theSession.TransientDB(),
370                                         attrs["left"], attrs["leftcolumn"],
371                                         attrs["right"], attrs["rightcolumn"],
372                                         outer_join = outer_join)
373            table.SetTitle(attrs["title"])
374            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
375    
376        def start_map(self, name, qname, attrs):
377            """Start a map."""
378            self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
379    
380        def end_map(self, name, qname):
381            self.theSession.AddMap(self.aMap)
382            self.aMap = None
383    
384        def start_projection(self, name, qname, attrs):
385            attrs = self.check_attrs(name, attrs,
386                                     [AttrDesc("name", conversion=self.encode),
387                                      AttrDesc("epsg", default=None,
388                                               conversion=self.encode)])
389            self.projection_name = attrs["name"]
390            self.projection_epsg = attrs["epsg"]
391            self.projection_params = [ ]
392    
393        def end_projection(self, name, qname):
394            if self.aLayer is not None:
395                obj = self.aLayer
396            elif self.aMap is not None:
397                obj = self.aMap
398            else:
399                assert False, "projection tag out of context"
400              pass              pass
401    
402  def load_session(filename):          obj.SetProjection(Projection(self.projection_params,
403      """Load a Thuban session from the file object file"""                                       self.projection_name,
404      dir = os.path.dirname(filename)                                       epsg = self.projection_epsg))
405      file = open(filename)  
406      handler = ProcessSession(dir)      def start_parameter(self, name, qname, attrs):
407            s = attrs.get((None, 'value'))
408      if oldPython:          s = str(s) # we can't handle unicode in proj
409          parser = make_parser()          self.projection_params.append(s)
410          parser.setDocumentHandler(handler)  
411          parser.setErrorHandler(saxutils.ErrorPrinter())      def start_layer(self, name, qname, attrs, layer_class = Layer):
412          parser.parseFile(file)          """Start a layer
413          parser.close()  
414      else:          Instantiate a layer of class layer_class from the attributes in
415          xml.sax.parse(file,handler)          attrs which may be a dictionary as well as the normal SAX attrs
416            object and bind it to self.aLayer.
417            """
418            title = self.encode(attrs.get((None, 'title'), ""))
419            filename = attrs.get((None, 'filename'), "")
420            filename = os.path.join(self.GetDirectory(), filename)
421            filename = self.encode(filename)
422            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
423            fill = parse_color(attrs.get((None, 'fill'), "None"))
424            stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
425            stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
426            if attrs.has_key((None, "shapestore")):
427                store = self.idmap[attrs[(None, "shapestore")]]
428            else:
429                store = self.theSession.OpenShapefile(filename)
430            self.aLayer = layer_class(title, store,
431                                      fill = fill, stroke = stroke,
432                                      lineWidth = stroke_width,
433                                      visible = visible)
434    
435        def end_layer(self, name, qname):
436            self.aMap.AddLayer(self.aLayer)
437            self.aLayer = None
438    
439        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
440            title = self.encode(attrs.get((None, 'title'), ""))
441            filename = attrs.get((None, 'filename'), "")
442            filename = os.path.join(self.GetDirectory(), filename)
443            filename = self.encode(filename)
444            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
445    
446            self.aLayer = layer_class(title, filename, visible = visible)
447    
448        def end_rasterlayer(self, name, qname):
449            self.aMap.AddLayer(self.aLayer)
450            self.aLayer = None
451    
452        def start_classification(self, name, qname, attrs):
453            attrs = self.check_attrs(name, attrs,
454                                     [AttrDesc("field", True),
455                                      AttrDesc("field_type", True)])
456            field = attrs["field"]
457            fieldType = attrs["field_type"]
458    
459            dbFieldType = self.aLayer.GetFieldType(field)
460    
461            if fieldType != dbFieldType:
462                raise ValueError(_("xml field type differs from database!"))
463    
464            # setup conversion routines depending on the kind of data
465            # we will be seeing later on
466            if fieldType == FIELDTYPE_STRING:
467                self.conv = str
468            elif fieldType == FIELDTYPE_INT:
469                self.conv = lambda p: int(float(p))
470            elif fieldType == FIELDTYPE_DOUBLE:
471                self.conv = float
472    
473            self.aLayer.SetClassificationColumn(field)
474    
475        def end_classification(self, name, qname):
476            pass
477    
478        def start_clnull(self, name, qname, attrs):
479            self.cl_group = ClassGroupDefault()
480            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
481            self.cl_prop = ClassGroupProperties()
482    
483        def end_clnull(self, name, qname):
484            self.cl_group.SetProperties(self.cl_prop)
485            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
486            del self.cl_group, self.cl_prop
487    
488        def start_clpoint(self, name, qname, attrs):
489            attrib_value = attrs.get((None, 'value'), "0")
490    
491            field = self.aLayer.GetClassificationColumn()
492            if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
493                value = self.encode(attrib_value)
494            else:
495                value = self.conv(attrib_value)
496            self.cl_group = ClassGroupSingleton(value)
497            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
498            self.cl_prop = ClassGroupProperties()
499    
500    
501        def end_clpoint(self, name, qname):
502            self.cl_group.SetProperties(self.cl_prop)
503            self.aLayer.GetClassification().AppendGroup(self.cl_group)
504            del self.cl_group, self.cl_prop
505    
506        def start_clrange(self, name, qname, attrs):
507    
508            range = attrs.get((None, 'range'), None)
509            # for backward compatibility (min/max are not saved)
510            min   = attrs.get((None, 'min'), None)
511            max   = attrs.get((None, 'max'), None)
512    
513            try:
514                if range is not None:
515                    self.cl_group = ClassGroupRange(Range(range))
516                elif min is not None and max is not None:
517                    self.cl_group = ClassGroupRange((self.conv(min),
518                                                     self.conv(max)))
519                else:
520                    self.cl_group = ClassGroupRange(Range(None))
521    
522            except ValueError:
523                raise ValueError(_("Classification range is not a number!"))
524    
525            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
526            self.cl_prop = ClassGroupProperties()
527    
528    
529        def end_clrange(self, name, qname):
530            self.cl_group.SetProperties(self.cl_prop)
531            self.aLayer.GetClassification().AppendGroup(self.cl_group)
532            del self.cl_group, self.cl_prop
533    
534        def start_cldata(self, name, qname, attrs):
535            self.cl_prop.SetLineColor(
536                parse_color(attrs.get((None, 'stroke'), "None")))
537            self.cl_prop.SetLineWidth(
538                int(attrs.get((None, 'stroke_width'), "0")))
539            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
540    
541        def end_cldata(self, name, qname):
542            pass
543    
544        def start_labellayer(self, name, qname, attrs):
545            self.aLayer = self.aMap.LabelLayer()
546    
547        def start_label(self, name, qname, attrs):
548            x = float(attrs[(None, 'x')])
549            y = float(attrs[(None, 'y')])
550            text = self.encode(attrs[(None, 'text')])
551            halign = attrs[(None, 'halign')]
552            valign = attrs[(None, 'valign')]
553            self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
554    
555        def characters(self, chars):
556            pass
557    
558    
559    def load_session(filename, db_connection_callback = None):
560        """Load a Thuban session from the file object file
561    
562        The db_connection_callback, if given should be a callable object
563        that can be called like this:
564           db_connection_callback(params, message)
565    
566        where params is a dictionary containing the known connection
567        parameters and message is a string with a message why the connection
568        failed. db_connection_callback should return a new dictionary with
569        corrected and perhaps additional parameters like a password or None
570        to indicate that the user cancelled.
571        """
572        handler = SessionLoader(db_connection_callback)
573        handler.read(filename)
574    
575      session = handler.theSession      session = handler.theSession
576      # Newly loaded session aren't modified      # Newly loaded session aren't modified
577      session.UnsetModified()      session.UnsetModified()
578    
579        handler.Destroy()
580    
581      return session      return session
582    
 if __name__ == "__main__":  
     # find out the command to run  
     if len(sys.argv) > 1:  
         print "usage: cat <file> | " + sys.argv[0]  
     else:  
         parseSession(sys.stdin)  
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