/[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 1930 by bh, Tue Nov 11 13:24:41 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            If a conversion is specified, convert the value before putting
190            it into the returned dict. The following conversions are
191            available:
192    
193               'filename' -- The attribute is a filename.
194    
195                             If the filename is a relative name, interpret
196                             it relative to the directory containing the
197                             .thuban file and make it an absolute name
198    
199               'shapestore' -- The attribute is the ID of a shapestore
200                               defined earlier in the .thuban file. Look it
201                               up self.idmap
202    
203               'table' -- The attribute is the ID of a table or shapestore
204                          defined earlier in the .thuban file. Look it up
205                          self.idmap. If it's the ID of a shapestore the
206                          value will be the table of the shapestore.
207    
208               'idref' -- The attribute is the id of an object defined
209                          earlier in the .thuban file. Look it up self.idmap
210    
211               'ascii' -- The attribute is converted to a bytestring with
212                          ascii encoding.
213    
214               a callable -- The attribute value is passed to the callable
215                             and the return value is used a as the converted
216                             value
217            """
218            normalized = {}
219    
220            for d in descr:
221                if d.required and not attrs.has_key(d.fullname):
222                    raise LoadError("Element %s requires an attribute %r"
223                                    % (element, d.name))
224                value = attrs.get(d.fullname, d.default)
225    
226                if d.conversion in ("idref", "shapesource"):
227                    if value in self.idmap:
228                        value = self.idmap[value]
229                    else:
230                        raise LoadError("Element %s requires an already defined ID"
231                                        " in attribute %r"
232                                        % (element, d.name))
233                elif d.conversion == "table":
234                    if value in self.idmap:
235                        value = self.idmap[value]
236                        if isinstance(value, ShapefileStore):
237                            value = value.Table()
238                    else:
239                        raise LoadError("Element %s requires an already defined ID"
240                                        " in attribute %r"
241                                        % (element, d.name))
242                elif d.conversion == "filename":
243                    value = os.path.abspath(os.path.join(self.GetDirectory(),
244                                                         value))
245                elif d.conversion == "ascii":
246                    value = value.encode("ascii")
247                elif d.conversion:
248                    # Assume it's a callable
249                    value = d.conversion(value)
250    
251                normalized[d.name] = value
252            return normalized
253    
254        def start_dbconnection(self, name, qname, attrs):
255            attrs = self.check_attrs(name, attrs,
256                                     [AttrDesc("id", True),
257                                      AttrDesc("dbtype", True),
258                                      AttrDesc("host", False, ""),
259                                      AttrDesc("port", False, ""),
260                                      AttrDesc("user", False, ""),
261                                      AttrDesc("dbname", True)])
262            ID = attrs["id"]
263            dbtype = attrs["dbtype"]
264            if dbtype != "postgis":
265                raise LoadError("dbtype %r not supported" % filetype)
266    
267            del attrs["id"]
268            del attrs["dbtype"]
269    
270            # Try to open the connection and if it fails ask the user for
271            # the correct parameters repeatedly.
272            # FIXME: it would be better not to insist on getting a
273            # connection here. We should handle this more like the raster
274            # images where the layers etc still are created but are not
275            # drawn in case Thuban can't use the data for various reasons
276            while 1:
277                try:
278                    conn = postgisdb.PostGISConnection(**attrs)
279                    break
280                except postgisdb.ConnectionError, val:
281                    if self.db_connection_callback is not None:
282                        attrs = self.db_connection_callback(attrs, str(val))
283                        if attrs is None:
284                            raise LoadCancelled
285                    else:
286                        raise
287    
288            self.idmap[ID] = conn
289            self.theSession.AddDBConnection(conn)
290    
291        def start_dbshapesource(self, name, qname, attrs):
292            attrs = self.check_attrs(name, attrs,
293                                     [AttrDesc("id", True),
294                                      AttrDesc("dbconn", True,
295                                               conversion = "idref"),
296                                      AttrDesc("tablename", True,
297                                               conversion = "ascii")])
298            ID = attrs["id"]
299            db = attrs["dbconn"]
300            tablename = attrs["tablename"]
301            self.idmap[ID] = self.theSession.OpenDBShapeStore(db, tablename)
302    
303        def start_fileshapesource(self, name, qname, attrs):
304            attrs = self.check_attrs(name, attrs,
305                                      [AttrDesc("id", True),
306                                       AttrDesc("filename", True,
307                                                conversion = "filename"),
308                                       AttrDesc("filetype", True)])
309            ID = attrs["id"]
310            filename = attrs["filename"]
311            filetype = attrs["filetype"]
312            if filetype != "shapefile":
313                raise LoadError("shapesource filetype %r not supported" % filetype)
314            self.idmap[ID] = self.theSession.OpenShapefile(filename)
315    
316        def start_derivedshapesource(self, name, qname, attrs):
317            attrs = self.check_attrs(name, attrs,
318                                     [AttrDesc("id", True),
319                                      AttrDesc("shapesource", True,
320                                               conversion = "shapesource"),
321                                      AttrDesc("table", True, conversion="table")])
322            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
323            self.theSession.AddShapeStore(store)
324            self.idmap[attrs["id"]] = store
325    
326        def start_filetable(self, name, qname, attrs):
327            attrs = self.check_attrs(name, attrs,
328                                     [AttrDesc("id", True),
329                                      AttrDesc("title", True),
330                                      AttrDesc("filename", True,
331                                               conversion = "filename"),
332                                      AttrDesc("filetype")])
333            filetype = attrs["filetype"]
334            if filetype != "DBF":
335                raise LoadError("shapesource filetype %r not supported" % filetype)
336            table = DBFTable(attrs["filename"])
337            table.SetTitle(attrs["title"])
338            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
339    
340        def start_jointable(self, name, qname, attrs):
341            attrs = self.check_attrs(name, attrs,
342                                     [AttrDesc("id", True),
343                                      AttrDesc("title", True),
344                                      AttrDesc("left", True, conversion="table"),
345                                      AttrDesc("leftcolumn", True),
346                                      AttrDesc("right", True, conversion="table"),
347                                      AttrDesc("rightcolumn", True),
348    
349                                      # jointype is required for file
350                                      # version 0.9 but this attribute
351                                      # wasn't in the 0.8 version because of
352                                      # an oversight so we assume it's
353                                      # optional since we want to handle
354                                      # both file format versions here.
355                                      AttrDesc("jointype", False,
356                                               default="INNER")])
357    
358            jointype = attrs["jointype"]
359            if jointype == "LEFT OUTER":
360                outer_join = True
361            elif jointype == "INNER":
362                outer_join = False
363            else:
364                raise LoadError("jointype %r not supported" % jointype )
365            table = TransientJoinedTable(self.theSession.TransientDB(),
366                                         attrs["left"], attrs["leftcolumn"],
367                                         attrs["right"], attrs["rightcolumn"],
368                                         outer_join = outer_join)
369            table.SetTitle(attrs["title"])
370            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
371    
372        def start_map(self, name, qname, attrs):
373            """Start a map."""
374            self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
375    
376        def end_map(self, name, qname):
377            self.theSession.AddMap(self.aMap)
378            self.aMap = None
379    
380        def start_projection(self, name, qname, attrs):
381            attrs = self.check_attrs(name, attrs,
382                                     [AttrDesc("name", conversion=self.encode),
383                                      AttrDesc("epsg", default=None,
384                                               conversion=self.encode)])
385            self.projection_name = attrs["name"]
386            self.projection_epsg = attrs["epsg"]
387            self.projection_params = [ ]
388    
389        def end_projection(self, name, qname):
390            if self.aLayer is not None:
391                obj = self.aLayer
392            elif self.aMap is not None:
393                obj = self.aMap
394            else:
395                assert False, "projection tag out of context"
396              pass              pass
397    
398  def load_session(filename):          obj.SetProjection(Projection(self.projection_params,
399      """Load a Thuban session from the file object file"""                                       self.projection_name,
400      dir = os.path.dirname(filename)                                       epsg = self.projection_epsg))
401      file = open(filename)  
402      handler = ProcessSession(dir)      def start_parameter(self, name, qname, attrs):
403            s = attrs.get((None, 'value'))
404      if oldPython:          s = str(s) # we can't handle unicode in proj
405          parser = make_parser()          self.projection_params.append(s)
406          parser.setDocumentHandler(handler)  
407          parser.setErrorHandler(saxutils.ErrorPrinter())      def start_layer(self, name, qname, attrs, layer_class = Layer):
408          parser.parseFile(file)          """Start a layer
409          parser.close()  
410      else:          Instantiate a layer of class layer_class from the attributes in
411          xml.sax.parse(file,handler)          attrs which may be a dictionary as well as the normal SAX attrs
412            object and bind it to self.aLayer.
413            """
414            title = self.encode(attrs.get((None, 'title'), ""))
415            filename = attrs.get((None, 'filename'), "")
416            filename = os.path.join(self.GetDirectory(), filename)
417            filename = self.encode(filename)
418            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
419            fill = parse_color(attrs.get((None, 'fill'), "None"))
420            stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
421            stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
422            if attrs.has_key((None, "shapestore")):
423                store = self.idmap[attrs[(None, "shapestore")]]
424            else:
425                store = self.theSession.OpenShapefile(filename)
426            self.aLayer = layer_class(title, store,
427                                      fill = fill, stroke = stroke,
428                                      lineWidth = stroke_width,
429                                      visible = visible)
430    
431        def end_layer(self, name, qname):
432            self.aMap.AddLayer(self.aLayer)
433            self.aLayer = None
434    
435        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
436            title = self.encode(attrs.get((None, 'title'), ""))
437            filename = attrs.get((None, 'filename'), "")
438            filename = os.path.join(self.GetDirectory(), filename)
439            filename = self.encode(filename)
440            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
441    
442            self.aLayer = layer_class(title, filename, visible = visible)
443    
444        def end_rasterlayer(self, name, qname):
445            self.aMap.AddLayer(self.aLayer)
446            self.aLayer = None
447    
448        def start_classification(self, name, qname, attrs):
449            field = attrs.get((None, 'field'), None)
450    
451            fieldType = attrs.get((None, 'field_type'), None)
452            dbFieldType = self.aLayer.GetFieldType(field)
453    
454            if fieldType != dbFieldType:
455                raise ValueError(_("xml field type differs from database!"))
456    
457            # setup conversion routines depending on the kind of data
458            # we will be seeing later on
459            if fieldType == FIELDTYPE_STRING:
460                self.conv = str
461            elif fieldType == FIELDTYPE_INT:
462                self.conv = lambda p: int(float(p))
463            elif fieldType == FIELDTYPE_DOUBLE:
464                self.conv = float
465    
466            self.aLayer.SetClassificationColumn(field)
467    
468        def end_classification(self, name, qname):
469            pass
470    
471        def start_clnull(self, name, qname, attrs):
472            self.cl_group = ClassGroupDefault()
473            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
474            self.cl_prop = ClassGroupProperties()
475    
476        def end_clnull(self, name, qname):
477            self.cl_group.SetProperties(self.cl_prop)
478            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
479            del self.cl_group, self.cl_prop
480    
481        def start_clpoint(self, name, qname, attrs):
482            attrib_value = attrs.get((None, 'value'), "0")
483    
484            field = self.aLayer.GetClassificationColumn()
485            if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
486                value = self.encode(attrib_value)
487            else:
488                value = self.conv(attrib_value)
489            self.cl_group = ClassGroupSingleton(value)
490            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
491            self.cl_prop = ClassGroupProperties()
492    
493    
494        def end_clpoint(self, name, qname):
495            self.cl_group.SetProperties(self.cl_prop)
496            self.aLayer.GetClassification().AppendGroup(self.cl_group)
497            del self.cl_group, self.cl_prop
498    
499        def start_clrange(self, name, qname, attrs):
500    
501            range = attrs.get((None, 'range'), None)
502            # for backward compatibility (min/max are not saved)
503            min   = attrs.get((None, 'min'), None)
504            max   = attrs.get((None, 'max'), None)
505    
506            try:
507                if range is not None:
508                    self.cl_group = ClassGroupRange(Range(range))
509                elif min is not None and max is not None:
510                    self.cl_group = ClassGroupRange((self.conv(min),
511                                                     self.conv(max)))
512                else:
513                    self.cl_group = ClassGroupRange(Range(None))
514    
515            except ValueError:
516                raise ValueError(_("Classification range is not a number!"))
517    
518            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
519            self.cl_prop = ClassGroupProperties()
520    
521    
522        def end_clrange(self, name, qname):
523            self.cl_group.SetProperties(self.cl_prop)
524            self.aLayer.GetClassification().AppendGroup(self.cl_group)
525            del self.cl_group, self.cl_prop
526    
527        def start_cldata(self, name, qname, attrs):
528            self.cl_prop.SetLineColor(
529                parse_color(attrs.get((None, 'stroke'), "None")))
530            self.cl_prop.SetLineWidth(
531                int(attrs.get((None, 'stroke_width'), "0")))
532            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
533    
534        def end_cldata(self, name, qname):
535            pass
536    
537        def start_labellayer(self, name, qname, attrs):
538            self.aLayer = self.aMap.LabelLayer()
539    
540        def start_label(self, name, qname, attrs):
541            x = float(attrs[(None, 'x')])
542            y = float(attrs[(None, 'y')])
543            text = self.encode(attrs[(None, 'text')])
544            halign = attrs[(None, 'halign')]
545            valign = attrs[(None, 'valign')]
546            self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
547    
548        def characters(self, chars):
549            pass
550    
551    
552    def load_session(filename, db_connection_callback = None):
553        """Load a Thuban session from the file object file
554    
555        The db_connection_callback, if given should be a callable object
556        that can be called like this:
557           db_connection_callback(params, message)
558    
559        where params is a dictionary containing the known connection
560        parameters and message is a string with a message why the connection
561        failed. db_connection_callback should return a new dictionary with
562        corrected and perhaps additional parameters like a password or None
563        to indicate that the user cancelled.
564        """
565        handler = SessionLoader(db_connection_callback)
566        handler.read(filename)
567    
568      session = handler.theSession      session = handler.theSession
569      # Newly loaded session aren't modified      # Newly loaded session aren't modified
570      session.UnsetModified()      session.UnsetModified()
571    
572        handler.Destroy()
573    
574      return session      return session
575    
 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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