/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 1844 by bh, Tue Oct 21 10:49:44 2003 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001 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        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  class ProcessSession(HandlerBase):          # set by the SessionLoader's check_attrs method
98            self.value = None
99    
     def __init__(self, directory):  
         """Inititialize the Sax handler.  
100    
101          directory is the directory containing the session file. It's  class SessionLoader(XMLReader):
102          needed to interpret embedded relative filenames  
103          """      def __init__(self, db_connection_callback = None):
104          self.directory = directory          """Inititialize the Sax handler."""
105          self.chars = ''          XMLReader.__init__(self)
106    
107            self.db_connection_callback = db_connection_callback
108    
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              self.aLayer = Layer(title, filename, fill = fill, stroke = stroke)              'map'           : ("start_map",            "end_map"),
129          elif name == 'table':              'projection'    : ("start_projection",     "end_projection"),
130              print "table title: %s" % attrs.get('title', None)              'parameter'     : ("start_parameter",      None),
131          elif name == 'labellayer':              'layer'         : ("start_layer",          "end_layer"),
132              self.aLayer = self.aMap.LabelLayer()              'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
133          elif name == 'label':              'classification': ("start_classification", "end_classification"),
134              x = float(attrs['x'])              'clnull'        : ("start_clnull",         "end_clnull"),
135              y = float(attrs['y'])              'clpoint'       : ("start_clpoint",        "end_clpoint"),
136              text = attrs['text']              'clrange'       : ("start_clrange",        "end_clrange"),
137              halign = attrs['halign']              'cldata'        : ("start_cldata",         "end_cldata"),
138              valign = attrs['valign']              'table'         : ("start_table",          "end_table"),
139              self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)              'labellayer'    : ("start_labellayer",     None),
140                        'label'         : ("start_label",          None)}
141    
142      if not oldPython and test_for_broken_SAX():          # all dispatchers should be used for the 0.8 and 0.9 namespaces too
143          # works with python 2.0, but is not SAX compliant          for xmlns in ("http://thuban.intevation.org/dtds/thuban-0.8.dtd",
144          def characters(self, ch):                        "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd",
145              self.my_characters(ch)                        "http://thuban.intevation.org/dtds/thuban-0.9.dtd",
146      else:                        "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"):
147          # SAX compliant              for key, value in dispatchers.items():
148          def characters(self, ch, start, length):                  dispatchers[(xmlns, key)] = value
149              self.my_characters(ch[start:start+length])  
150            XMLReader.AddDispatchers(self, dispatchers)
151      def my_characters(self, ch):  
152          self.chars = self.chars + ch      def start_session(self, name, qname, attrs):
153            self.theSession = Session(self.encode(attrs.get((None, 'title'),
154      def endElement(self, name):                                                          None)))
155          # If it's not a parameter element, ignore it  
156          if name == 'session':      def end_session(self, name, qname):
157              #print "end of session"          pass
158              pass  
159          if name == 'map':      def check_attrs(self, element, attrs, descr):
160              self.theSession.AddMap(self.aMap)          """Check and convert some of the attributes of an element
161          if name == 'projection':  
162              self.aMap.SetProjection(Projection(self.ProjectionParams))          Parameters:
163          if name == 'layer':             element -- The element name
164              self.aMap.AddLayer(self.aLayer)             attrs -- The attrs mapping as passed to the start_* methods
165          if name == 'table':             descr -- Sequence of attribute descriptions (AttrDesc instances)
166              #print "end of table"  
167            Return a dictionary containig normalized versions of the
168            attributes described in descr. The keys of that dictionary are
169            the name attributes of the attribute descriptions. The attrs
170            dictionary will not be modified.
171    
172            If the attribute is required, i.e. the 'required' attribute of
173            the descrtiption is true, but it is not in attrs, raise a
174            LoadError.
175    
176            If the attribute has a default value and it is not present in
177            attrs, use that default value as the value in the returned dict.
178    
179            If a conversion is specified, convert the value before putting
180            it into the returned dict. The following conversions are
181            available:
182    
183               'filename' -- The attribute is a filename.
184    
185                             If the filename is a relative name, interpret
186                             it relative to the directory containing the
187                             .thuban file and make it an absolute name
188    
189               'shapestore' -- The attribute is the ID of a shapestore
190                               defined earlier in the .thuban file. Look it
191                               up self.idmap
192    
193               'table' -- The attribute is the ID of a table or shapestore
194                          defined earlier in the .thuban file. Look it up
195                          self.idmap. If it's the ID of a shapestore the
196                          value will be the table of the shapestore.
197    
198               'idref' -- The attribute is the id of an object defined
199                          earlier in the .thuban file. Look it up self.idmap
200    
201               'ascii' -- The attribute is converted to a bytestring with
202                          ascii encoding.
203    
204               a callable -- The attribute value is passed to the callable
205                             and the return value is used a as the converted
206                             value
207            """
208            normalized = {}
209    
210            for d in descr:
211                if d.required and not attrs.has_key(d.fullname):
212                    raise LoadError("Element %s requires an attribute %r"
213                                    % (element, d.name))
214                value = attrs.get(d.fullname, d.default)
215    
216                if d.conversion in ("idref", "shapesource"):
217                    if value in self.idmap:
218                        value = self.idmap[value]
219                    else:
220                        raise LoadError("Element %s requires an already defined ID"
221                                        " in attribute %r"
222                                        % (element, d.name))
223                elif d.conversion == "table":
224                    if value in self.idmap:
225                        value = self.idmap[value]
226                        if isinstance(value, ShapefileStore):
227                            value = value.Table()
228                    else:
229                        raise LoadError("Element %s requires an already defined ID"
230                                        " in attribute %r"
231                                        % (element, d.name))
232                elif d.conversion == "filename":
233                    value = os.path.abspath(os.path.join(self.GetDirectory(),
234                                                         value))
235                elif d.conversion == "ascii":
236                    value = value.encode("ascii")
237                elif d.conversion:
238                    # Assume it's a callable
239                    value = d.conversion(value)
240    
241                normalized[d.name] = value
242            return normalized
243    
244        def start_dbconnection(self, name, qname, attrs):
245            attrs = self.check_attrs(name, attrs,
246                                     [AttrDesc("id", True),
247                                      AttrDesc("dbtype", True),
248                                      AttrDesc("host", False, ""),
249                                      AttrDesc("port", False, ""),
250                                      AttrDesc("user", False, ""),
251                                      AttrDesc("dbname", True)])
252            ID = attrs["id"]
253            dbtype = attrs["dbtype"]
254            if dbtype != "postgis":
255                raise LoadError("dbtype %r not supported" % filetype)
256    
257            del attrs["id"]
258            del attrs["dbtype"]
259    
260            # Try to open the connection and if it fails ask the user for
261            # the correct parameters repeatedly.
262            # FIXME: it would be better not to insist on getting a
263            # connection here. We should handle this more like the raster
264            # images where the layers etc still are created but are not
265            # drawn in case Thuban can't use the data for various reasons
266            while 1:
267                try:
268                    conn = postgisdb.PostGISConnection(**attrs)
269                    break
270                except postgisdb.ConnectionError, val:
271                    if self.db_connection_callback is not None:
272                        attrs = self.db_connection_callback(attrs, str(val))
273                        if attrs is None:
274                            raise LoadCancelled
275                    else:
276                        raise
277    
278            self.idmap[ID] = conn
279            self.theSession.AddDBConnection(conn)
280    
281        def start_dbshapesource(self, name, qname, attrs):
282            attrs = self.check_attrs(name, attrs,
283                                     [AttrDesc("id", True),
284                                      AttrDesc("dbconn", True,
285                                               conversion = "idref"),
286                                      AttrDesc("tablename", True,
287                                               conversion = "ascii")])
288            ID = attrs["id"]
289            db = attrs["dbconn"]
290            tablename = attrs["tablename"]
291            self.idmap[ID] = self.theSession.OpenDBShapeStore(db, tablename)
292    
293        def start_fileshapesource(self, name, qname, attrs):
294            attrs = self.check_attrs(name, attrs,
295                                      [AttrDesc("id", True),
296                                       AttrDesc("filename", True,
297                                                conversion = "filename"),
298                                       AttrDesc("filetype", True)])
299            ID = attrs["id"]
300            filename = attrs["filename"]
301            filetype = attrs["filetype"]
302            if filetype != "shapefile":
303                raise LoadError("shapesource filetype %r not supported" % filetype)
304            self.idmap[ID] = self.theSession.OpenShapefile(filename)
305    
306        def start_derivedshapesource(self, name, qname, attrs):
307            attrs = self.check_attrs(name, attrs,
308                                     [AttrDesc("id", True),
309                                      AttrDesc("shapesource", True,
310                                               conversion = "shapesource"),
311                                      AttrDesc("table", True, conversion="table")])
312            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
313            self.theSession.AddShapeStore(store)
314            self.idmap[attrs["id"]] = store
315    
316        def start_filetable(self, name, qname, attrs):
317            attrs = self.check_attrs(name, attrs,
318                                     [AttrDesc("id", True),
319                                      AttrDesc("title", True),
320                                      AttrDesc("filename", True,
321                                               conversion = "filename"),
322                                      AttrDesc("filetype")])
323            filetype = attrs["filetype"]
324            if filetype != "DBF":
325                raise LoadError("shapesource filetype %r not supported" % filetype)
326            table = DBFTable(attrs["filename"])
327            table.SetTitle(attrs["title"])
328            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
329    
330        def start_jointable(self, name, qname, attrs):
331            attrs = self.check_attrs(name, attrs,
332                                     [AttrDesc("id", True),
333                                      AttrDesc("title", True),
334                                      AttrDesc("left", True, conversion="table"),
335                                      AttrDesc("leftcolumn", True),
336                                      AttrDesc("right", True, conversion="table"),
337                                      AttrDesc("rightcolumn", True),
338    
339                                      # jointype is required for file
340                                      # version 0.9 but this attribute
341                                      # wasn't in the 0.8 version because of
342                                      # an oversight so we assume it's
343                                      # optional since we want to handle
344                                      # both file format versions here.
345                                      AttrDesc("jointype", False,
346                                               default="INNER")])
347    
348            jointype = attrs["jointype"]
349            if jointype == "LEFT OUTER":
350                outer_join = True
351            elif jointype == "INNER":
352                outer_join = False
353            else:
354                raise LoadError("jointype %r not supported" % jointype )
355            table = TransientJoinedTable(self.theSession.TransientDB(),
356                                         attrs["left"], attrs["leftcolumn"],
357                                         attrs["right"], attrs["rightcolumn"],
358                                         outer_join = outer_join)
359            table.SetTitle(attrs["title"])
360            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
361    
362        def start_map(self, name, qname, attrs):
363            """Start a map."""
364            self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
365    
366        def end_map(self, name, qname):
367            self.theSession.AddMap(self.aMap)
368            self.aMap = None
369    
370        def start_projection(self, name, qname, attrs):
371            attrs = self.check_attrs(name, attrs,
372                                     [AttrDesc("name", conversion=self.encode),
373                                      AttrDesc("epsg", default=None,
374                                               conversion=self.encode)])
375            self.projection_name = attrs["name"]
376            self.projection_epsg = attrs["epsg"]
377            self.projection_params = [ ]
378    
379        def end_projection(self, name, qname):
380            if self.aLayer is not None:
381                obj = self.aLayer
382            elif self.aMap is not None:
383                obj = self.aMap
384            else:
385                assert False, "projection tag out of context"
386              pass              pass
387    
388  def load_session(filename):          obj.SetProjection(Projection(self.projection_params,
389      """Load a Thuban session from the file object file"""                                       self.projection_name,
390      dir = os.path.dirname(filename)                                       epsg = self.projection_epsg))
391      file = open(filename)  
392      handler = ProcessSession(dir)      def start_parameter(self, name, qname, attrs):
393            s = attrs.get((None, 'value'))
394      if oldPython:          s = str(s) # we can't handle unicode in proj
395          parser = make_parser()          self.projection_params.append(s)
396          parser.setDocumentHandler(handler)  
397          parser.setErrorHandler(saxutils.ErrorPrinter())      def start_layer(self, name, qname, attrs, layer_class = Layer):
398          parser.parseFile(file)          """Start a layer
399          parser.close()  
400      else:          Instantiate a layer of class layer_class from the attributes in
401          xml.sax.parse(file,handler)          attrs which may be a dictionary as well as the normal SAX attrs
402            object and bind it to self.aLayer.
403            """
404            title = self.encode(attrs.get((None, 'title'), ""))
405            filename = attrs.get((None, 'filename'), "")
406            filename = os.path.join(self.GetDirectory(), filename)
407            filename = self.encode(filename)
408            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
409            fill = parse_color(attrs.get((None, 'fill'), "None"))
410            stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
411            stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
412            if attrs.has_key((None, "shapestore")):
413                store = self.idmap[attrs[(None, "shapestore")]]
414            else:
415                store = self.theSession.OpenShapefile(filename)
416            self.aLayer = layer_class(title, store,
417                                      fill = fill, stroke = stroke,
418                                      lineWidth = stroke_width,
419                                      visible = visible)
420    
421        def end_layer(self, name, qname):
422            self.aMap.AddLayer(self.aLayer)
423            self.aLayer = None
424    
425        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
426            title = self.encode(attrs.get((None, 'title'), ""))
427            filename = attrs.get((None, 'filename'), "")
428            filename = os.path.join(self.GetDirectory(), filename)
429            filename = self.encode(filename)
430            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
431    
432            self.aLayer = layer_class(title, filename, visible = visible)
433    
434        def end_rasterlayer(self, name, qname):
435            self.aMap.AddLayer(self.aLayer)
436            self.aLayer = None
437    
438        def start_classification(self, name, qname, attrs):
439            field = attrs.get((None, 'field'), None)
440    
441            fieldType = attrs.get((None, 'field_type'), None)
442            dbFieldType = self.aLayer.GetFieldType(field)
443    
444            if fieldType != dbFieldType:
445                raise ValueError(_("xml field type differs from database!"))
446    
447            # setup conversion routines depending on the kind of data
448            # we will be seeing later on
449            if fieldType == FIELDTYPE_STRING:
450                self.conv = str
451            elif fieldType == FIELDTYPE_INT:
452                self.conv = lambda p: int(float(p))
453            elif fieldType == FIELDTYPE_DOUBLE:
454                self.conv = float
455    
456            self.aLayer.SetClassificationColumn(field)
457    
458        def end_classification(self, name, qname):
459            pass
460    
461        def start_clnull(self, name, qname, attrs):
462            self.cl_group = ClassGroupDefault()
463            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
464            self.cl_prop = ClassGroupProperties()
465    
466        def end_clnull(self, name, qname):
467            self.cl_group.SetProperties(self.cl_prop)
468            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
469            del self.cl_group, self.cl_prop
470    
471        def start_clpoint(self, name, qname, attrs):
472            attrib_value = attrs.get((None, 'value'), "0")
473    
474            field = self.aLayer.GetClassificationColumn()
475            if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
476                value = self.encode(attrib_value)
477            else:
478                value = self.conv(attrib_value)
479            self.cl_group = ClassGroupSingleton(value)
480            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
481            self.cl_prop = ClassGroupProperties()
482    
483    
484        def end_clpoint(self, name, qname):
485            self.cl_group.SetProperties(self.cl_prop)
486            self.aLayer.GetClassification().AppendGroup(self.cl_group)
487            del self.cl_group, self.cl_prop
488    
489        def start_clrange(self, name, qname, attrs):
490    
491            range = attrs.get((None, 'range'), None)
492            # for backward compatibility (min/max are not saved)
493            min   = attrs.get((None, 'min'), None)
494            max   = attrs.get((None, 'max'), None)
495    
496            try:
497                if range is not None:
498                    self.cl_group = ClassGroupRange(Range(range))
499                elif min is not None and max is not None:
500                    self.cl_group = ClassGroupRange((self.conv(min),
501                                                     self.conv(max)))
502                else:
503                    self.cl_group = ClassGroupRange(Range(None))
504    
505            except ValueError:
506                raise ValueError(_("Classification range is not a number!"))
507    
508            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
509            self.cl_prop = ClassGroupProperties()
510    
511    
512        def end_clrange(self, name, qname):
513            self.cl_group.SetProperties(self.cl_prop)
514            self.aLayer.GetClassification().AppendGroup(self.cl_group)
515            del self.cl_group, self.cl_prop
516    
517        def start_cldata(self, name, qname, attrs):
518            self.cl_prop.SetLineColor(
519                parse_color(attrs.get((None, 'stroke'), "None")))
520            self.cl_prop.SetLineWidth(
521                int(attrs.get((None, 'stroke_width'), "0")))
522            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
523    
524        def end_cldata(self, name, qname):
525            pass
526    
527        def start_labellayer(self, name, qname, attrs):
528            self.aLayer = self.aMap.LabelLayer()
529    
530        def start_label(self, name, qname, attrs):
531            x = float(attrs[(None, 'x')])
532            y = float(attrs[(None, 'y')])
533            text = self.encode(attrs[(None, 'text')])
534            halign = attrs[(None, 'halign')]
535            valign = attrs[(None, 'valign')]
536            self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
537    
538        def characters(self, chars):
539            pass
540    
541    
542    def load_session(filename, db_connection_callback = None):
543        """Load a Thuban session from the file object file
544    
545        The db_connection_callback, if given should be a callable object
546        that can be called like this:
547           db_connection_callback(params, message)
548    
549        where params is a dictionary containing the known connection
550        parameters and message is a string with a message why the connection
551        failed. db_connection_callback should return a new dictionary with
552        corrected and perhaps additional parameters like a password or None
553        to indicate that the user cancelled.
554        """
555        handler = SessionLoader(db_connection_callback)
556        handler.read(filename)
557    
558      session = handler.theSession      session = handler.theSession
559      # Newly loaded session aren't modified      # Newly loaded session aren't modified
560      session.UnsetModified()      session.UnsetModified()
561    
562      return session      return session
563    
 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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