/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
ViewVC logotype

Diff of /branches/WIP-pyshapelib-bramz/Thuban/Model/load.py

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 75 by bh, Mon Feb 4 19:22:22 2002 UTC revision 2004 by bh, Tue Dec 2 13:25:55 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)                        "http://thuban.intevation.org/dtds/thuban-1.0rc1.dtd"):
148      else:              for key, value in dispatchers.items():
149          # SAX compliant                  dispatchers[(xmlns, key)] = value
150          def characters(self, ch, start, length):  
151              self.my_characters(ch[start:start+length])          XMLReader.AddDispatchers(self, dispatchers)
152    
153      def my_characters(self, ch):      def Destroy(self):
154          self.chars = self.chars + ch          """Clear all instance variables to cut cyclic references.
155    
156      def endElement(self, name):          The GC would have collected the loader eventually but it can
157          # If it's not a parameter element, ignore it          happen that it doesn't run at all until Thuban is closed (2.3
158          if name == 'session':          but not 2.2 tries a bit harder and forces a collection when the
159              #print "end of session"          interpreter terminates)
160              pass          """
161          if name == 'map':          self.__dict__.clear()
162              self.theSession.AddMap(self.aMap)  
163          if name == 'projection':      def start_session(self, name, qname, attrs):
164              self.aMap.SetProjection(Projection(self.ProjectionParams))          self.theSession = Session(self.encode(attrs.get((None, 'title'),
165          if name == 'layer':                                                          None)))
166              self.aMap.AddLayer(self.aLayer)  
167          if name == 'table':      def end_session(self, name, qname):
168              #print "end of table"          pass
169    
170        def check_attrs(self, element, attrs, descr):
171            """Check and convert some of the attributes of an element
172    
173            Parameters:
174               element -- The element name
175               attrs -- The attrs mapping as passed to the start_* methods
176               descr -- Sequence of attribute descriptions (AttrDesc instances)
177    
178            Return a dictionary containig normalized versions of the
179            attributes described in descr. The keys of that dictionary are
180            the name attributes of the attribute descriptions. The attrs
181            dictionary will not be modified.
182    
183            If the attribute is required, i.e. the 'required' attribute of
184            the descrtiption is true, but it is not in attrs, raise a
185            LoadError.
186    
187            If the attribute has a default value and it is not present in
188            attrs, use that default value as the value in the returned dict.
189    
190            The value is converted before putting it into the returned dict.
191            The following conversions are 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 as the converted
216                             value
217    
218            If no conversion is specified for an attribute it is converted
219            with self.encode.
220            """
221            normalized = {}
222    
223            for d in descr:
224                if d.required and not attrs.has_key(d.fullname):
225                    raise LoadError("Element %s requires an attribute %r"
226                                    % (element, d.name))
227                value = attrs.get(d.fullname, d.default)
228    
229                if d.conversion in ("idref", "shapesource"):
230                    if value in self.idmap:
231                        value = self.idmap[value]
232                    else:
233                        raise LoadError("Element %s requires an already defined ID"
234                                        " in attribute %r"
235                                        % (element, d.name))
236                elif d.conversion == "table":
237                    if value in self.idmap:
238                        value = self.idmap[value]
239                        if isinstance(value, ShapefileStore):
240                            value = value.Table()
241                    else:
242                        raise LoadError("Element %s requires an already defined ID"
243                                        " in attribute %r"
244                                        % (element, d.name))
245                elif d.conversion == "filename":
246                    value = os.path.abspath(os.path.join(self.GetDirectory(),
247                                                         value))
248                elif d.conversion == "ascii":
249                    value = value.encode("ascii")
250                elif d.conversion:
251                    # Assume it's a callable
252                    value = d.conversion(value)
253                else:
254                   value = self.encode(value)
255    
256                normalized[d.name] = value
257            return normalized
258    
259        def start_dbconnection(self, name, qname, attrs):
260            attrs = self.check_attrs(name, attrs,
261                                     [AttrDesc("id", True),
262                                      AttrDesc("dbtype", True),
263                                      AttrDesc("host", False, ""),
264                                      AttrDesc("port", False, ""),
265                                      AttrDesc("user", False, ""),
266                                      AttrDesc("dbname", True)])
267            ID = attrs["id"]
268            dbtype = attrs["dbtype"]
269            if dbtype != "postgis":
270                raise LoadError("dbtype %r not supported" % filetype)
271    
272            del attrs["id"]
273            del attrs["dbtype"]
274    
275            # Try to open the connection and if it fails ask the user for
276            # the correct parameters repeatedly.
277            # FIXME: it would be better not to insist on getting a
278            # connection here. We should handle this more like the raster
279            # images where the layers etc still are created but are not
280            # drawn in case Thuban can't use the data for various reasons
281            while 1:
282                try:
283                    conn = postgisdb.PostGISConnection(**attrs)
284                    break
285                except postgisdb.ConnectionError, val:
286                    if self.db_connection_callback is not None:
287                        attrs = self.db_connection_callback(attrs, str(val))
288                        if attrs is None:
289                            raise LoadCancelled
290                    else:
291                        raise
292    
293            self.idmap[ID] = conn
294            self.theSession.AddDBConnection(conn)
295    
296        def start_dbshapesource(self, name, qname, attrs):
297            attrs = self.check_attrs(name, attrs,
298                                     [AttrDesc("id", True),
299                                      AttrDesc("dbconn", True,
300                                               conversion = "idref"),
301                                      AttrDesc("tablename", True,
302                                               conversion = "ascii")])
303            ID = attrs["id"]
304            db = attrs["dbconn"]
305            tablename = attrs["tablename"]
306            self.idmap[ID] = self.theSession.OpenDBShapeStore(db, tablename)
307    
308        def start_fileshapesource(self, name, qname, attrs):
309            attrs = self.check_attrs(name, attrs,
310                                      [AttrDesc("id", True),
311                                       AttrDesc("filename", True,
312                                                conversion = "filename"),
313                                       AttrDesc("filetype", True)])
314            ID = attrs["id"]
315            filename = attrs["filename"]
316            filetype = attrs["filetype"]
317            if filetype != "shapefile":
318                raise LoadError("shapesource filetype %r not supported" % filetype)
319            self.idmap[ID] = self.theSession.OpenShapefile(filename)
320    
321        def start_derivedshapesource(self, name, qname, attrs):
322            attrs = self.check_attrs(name, attrs,
323                                     [AttrDesc("id", True),
324                                      AttrDesc("shapesource", True,
325                                               conversion = "shapesource"),
326                                      AttrDesc("table", True, conversion="table")])
327            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
328            self.theSession.AddShapeStore(store)
329            self.idmap[attrs["id"]] = store
330    
331        def start_filetable(self, name, qname, attrs):
332            attrs = self.check_attrs(name, attrs,
333                                     [AttrDesc("id", True),
334                                      AttrDesc("title", True),
335                                      AttrDesc("filename", True,
336                                               conversion = "filename"),
337                                      AttrDesc("filetype")])
338            filetype = attrs["filetype"]
339            if filetype != "DBF":
340                raise LoadError("shapesource filetype %r not supported" % filetype)
341            table = DBFTable(attrs["filename"])
342            table.SetTitle(attrs["title"])
343            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
344    
345        def start_jointable(self, name, qname, attrs):
346            attrs = self.check_attrs(name, attrs,
347                                     [AttrDesc("id", True),
348                                      AttrDesc("title", True),
349                                      AttrDesc("left", True, conversion="table"),
350                                      AttrDesc("leftcolumn", True),
351                                      AttrDesc("right", True, conversion="table"),
352                                      AttrDesc("rightcolumn", True),
353    
354                                      # jointype is required for file
355                                      # version 0.9 but this attribute
356                                      # wasn't in the 0.8 version because of
357                                      # an oversight so we assume it's
358                                      # optional since we want to handle
359                                      # both file format versions here.
360                                      AttrDesc("jointype", False,
361                                               default="INNER")])
362    
363            jointype = attrs["jointype"]
364            if jointype == "LEFT OUTER":
365                outer_join = True
366            elif jointype == "INNER":
367                outer_join = False
368            else:
369                raise LoadError("jointype %r not supported" % jointype )
370            table = TransientJoinedTable(self.theSession.TransientDB(),
371                                         attrs["left"], attrs["leftcolumn"],
372                                         attrs["right"], attrs["rightcolumn"],
373                                         outer_join = outer_join)
374            table.SetTitle(attrs["title"])
375            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
376    
377        def start_map(self, name, qname, attrs):
378            """Start a map."""
379            self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
380    
381        def end_map(self, name, qname):
382            self.theSession.AddMap(self.aMap)
383            self.aMap = None
384    
385        def start_projection(self, name, qname, attrs):
386            attrs = self.check_attrs(name, attrs,
387                                     [AttrDesc("name", conversion=self.encode),
388                                      AttrDesc("epsg", default=None,
389                                               conversion=self.encode)])
390            self.projection_name = attrs["name"]
391            self.projection_epsg = attrs["epsg"]
392            self.projection_params = [ ]
393    
394        def end_projection(self, name, qname):
395            if self.aLayer is not None:
396                obj = self.aLayer
397            elif self.aMap is not None:
398                obj = self.aMap
399            else:
400                assert False, "projection tag out of context"
401              pass              pass
402    
403  def load_session(filename):          obj.SetProjection(Projection(self.projection_params,
404      """Load a Thuban session from the file object file"""                                       self.projection_name,
405      dir = os.path.dirname(filename)                                       epsg = self.projection_epsg))
406      file = open(filename)  
407      handler = ProcessSession(dir)      def start_parameter(self, name, qname, attrs):
408            s = attrs.get((None, 'value'))
409      if oldPython:          s = str(s) # we can't handle unicode in proj
410          parser = make_parser()          self.projection_params.append(s)
411          parser.setDocumentHandler(handler)  
412          parser.setErrorHandler(saxutils.ErrorPrinter())      def start_layer(self, name, qname, attrs, layer_class = Layer):
413          parser.parseFile(file)          """Start a layer
414          parser.close()  
415      else:          Instantiate a layer of class layer_class from the attributes in
416          xml.sax.parse(file,handler)          attrs which may be a dictionary as well as the normal SAX attrs
417            object and bind it to self.aLayer.
418            """
419            title = self.encode(attrs.get((None, 'title'), ""))
420            filename = attrs.get((None, 'filename'), "")
421            filename = os.path.join(self.GetDirectory(), filename)
422            filename = self.encode(filename)
423            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
424            fill = parse_color(attrs.get((None, 'fill'), "None"))
425            stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
426            stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
427            if attrs.has_key((None, "shapestore")):
428                store = self.idmap[attrs[(None, "shapestore")]]
429            else:
430                store = self.theSession.OpenShapefile(filename)
431            self.aLayer = layer_class(title, store,
432                                      fill = fill, stroke = stroke,
433                                      lineWidth = stroke_width,
434                                      visible = visible)
435    
436        def end_layer(self, name, qname):
437            self.aMap.AddLayer(self.aLayer)
438            self.aLayer = None
439    
440        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
441            title = self.encode(attrs.get((None, 'title'), ""))
442            filename = attrs.get((None, 'filename'), "")
443            filename = os.path.join(self.GetDirectory(), filename)
444            filename = self.encode(filename)
445            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
446    
447            self.aLayer = layer_class(title, filename, visible = visible)
448    
449        def end_rasterlayer(self, name, qname):
450            self.aMap.AddLayer(self.aLayer)
451            self.aLayer = None
452    
453        def start_classification(self, name, qname, attrs):
454            attrs = self.check_attrs(name, attrs,
455                                     [AttrDesc("field", True),
456                                      AttrDesc("field_type", True)])
457            field = attrs["field"]
458            fieldType = attrs["field_type"]
459    
460            dbFieldType = self.aLayer.GetFieldType(field)
461    
462            if fieldType != dbFieldType:
463                raise ValueError(_("xml field type differs from database!"))
464    
465            # setup conversion routines depending on the kind of data
466            # we will be seeing later on
467            if fieldType == FIELDTYPE_STRING:
468                self.conv = str
469            elif fieldType == FIELDTYPE_INT:
470                self.conv = lambda p: int(float(p))
471            elif fieldType == FIELDTYPE_DOUBLE:
472                self.conv = float
473    
474            self.aLayer.SetClassificationColumn(field)
475    
476        def end_classification(self, name, qname):
477            pass
478    
479        def start_clnull(self, name, qname, attrs):
480            self.cl_group = ClassGroupDefault()
481            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
482            self.cl_prop = ClassGroupProperties()
483    
484        def end_clnull(self, name, qname):
485            self.cl_group.SetProperties(self.cl_prop)
486            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
487            del self.cl_group, self.cl_prop
488    
489        def start_clpoint(self, name, qname, attrs):
490            attrib_value = attrs.get((None, 'value'), "0")
491    
492            field = self.aLayer.GetClassificationColumn()
493            if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
494                value = self.encode(attrib_value)
495            else:
496                value = self.conv(attrib_value)
497            self.cl_group = ClassGroupSingleton(value)
498            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
499            self.cl_prop = ClassGroupProperties()
500    
501    
502        def end_clpoint(self, name, qname):
503            self.cl_group.SetProperties(self.cl_prop)
504            self.aLayer.GetClassification().AppendGroup(self.cl_group)
505            del self.cl_group, self.cl_prop
506    
507        def start_clrange(self, name, qname, attrs):
508    
509            range = attrs.get((None, 'range'), None)
510            # for backward compatibility (min/max are not saved)
511            min   = attrs.get((None, 'min'), None)
512            max   = attrs.get((None, 'max'), None)
513    
514            try:
515                if range is not None:
516                    self.cl_group = ClassGroupRange(Range(range))
517                elif min is not None and max is not None:
518                    self.cl_group = ClassGroupRange((self.conv(min),
519                                                     self.conv(max)))
520                else:
521                    self.cl_group = ClassGroupRange(Range(None))
522    
523            except ValueError:
524                raise ValueError(_("Classification range is not a number!"))
525    
526            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
527            self.cl_prop = ClassGroupProperties()
528    
529    
530        def end_clrange(self, name, qname):
531            self.cl_group.SetProperties(self.cl_prop)
532            self.aLayer.GetClassification().AppendGroup(self.cl_group)
533            del self.cl_group, self.cl_prop
534    
535        def start_cldata(self, name, qname, attrs):
536            self.cl_prop.SetLineColor(
537                parse_color(attrs.get((None, 'stroke'), "None")))
538            self.cl_prop.SetLineWidth(
539                int(attrs.get((None, 'stroke_width'), "0")))
540            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
541    
542        def end_cldata(self, name, qname):
543            pass
544    
545        def start_labellayer(self, name, qname, attrs):
546            self.aLayer = self.aMap.LabelLayer()
547    
548        def start_label(self, name, qname, attrs):
549            x = float(attrs[(None, 'x')])
550            y = float(attrs[(None, 'y')])
551            text = self.encode(attrs[(None, 'text')])
552            halign = attrs[(None, 'halign')]
553            valign = attrs[(None, 'valign')]
554            self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
555    
556        def characters(self, chars):
557            pass
558    
559    
560    def load_session(filename, db_connection_callback = None):
561        """Load a Thuban session from the file object file
562    
563        The db_connection_callback, if given should be a callable object
564        that can be called like this:
565           db_connection_callback(params, message)
566    
567        where params is a dictionary containing the known connection
568        parameters and message is a string with a message why the connection
569        failed. db_connection_callback should return a new dictionary with
570        corrected and perhaps additional parameters like a password or None
571        to indicate that the user cancelled.
572        """
573        handler = SessionLoader(db_connection_callback)
574        handler.read(filename)
575    
576      session = handler.theSession      session = handler.theSession
577      # Newly loaded session aren't modified      # Newly loaded session aren't modified
578      session.UnsetModified()      session.UnsetModified()
579    
580        handler.Destroy()
581    
582      return session      return session
583    
 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)  
Legend:
Removed from v.75  
changed lines
  Added in v.2004
[email protected]
 ViewVC Help
Powered by ViewVC 1.1.26