/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 706 by jonathan, Wed Apr 23 08:44:21 2003 UTC revision 2688 by frank, Fri Jun 30 12:27:20 2006 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003, 2004, 2005 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
4  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
5  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
6    # Frank Koormann <[email protected]>
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # Read the file COPYING coming with GRASS for details.  # Read the file COPYING coming with GRASS for details.
# Line 13  Parser for thuban session files. Line 14  Parser for thuban session files.
14    
15  __version__ = "$Revision$"  __version__ = "$Revision$"
16    
17  import sys, string, os  import string, os
18    
19  import xml.sax  import xml.sax
20  import xml.sax.handler  import xml.sax.handler
21  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
22    
23  from Thuban import _  from Thuban import _
 from Thuban.common import *  
24    
25  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
26       FIELDTYPE_STRING       FIELDTYPE_STRING
27    
28    from Thuban.Model.color import Color, Transparent
29    
30  from Thuban.Model.session import Session  from Thuban.Model.session import Session
31  from Thuban.Model.map import Map  from Thuban.Model.map import Map
32  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer, RasterLayer
 from Thuban.Model.color import Color  
33  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
34    from Thuban.Model.range import Range
35  from Thuban.Model.classification import Classification, \  from Thuban.Model.classification import Classification, \
36      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, \
37        ClassGroupPattern, ClassGroupMap, \
38      ClassGroupProperties      ClassGroupProperties
39    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
40    from Thuban.Model.table import DBFTable
41    from Thuban.Model.transientdb import TransientJoinedTable
42    
43    from Thuban.Model.xmlreader import XMLReader
44    import resource
45    
46    import postgisdb
47    
48    class LoadError(Exception):
49    
50        """Exception raised when the thuban file is corrupted
51    
52        Not all cases of corrupted thuban files will lead to this exception
53        but those that are found by checks in the loading code itself are.
54        """
55    
56    
57    class LoadCancelled(Exception):
58    
59        """Exception raised to indicate that loading was interrupted by the user"""
60    
61    
62  def parse_color(color):  def parse_color(color):
# Line 43  def parse_color(color): Line 67  def parse_color(color):
67      """      """
68      color = string.strip(color)      color = string.strip(color)
69      if color == "None":      if color == "None":
70          result = Color.Transparent          result = Transparent
71      elif color[0] == '#':      elif color[0] == '#':
72          if len(color) == 7:          if len(color) == 7:
73              r = string.atoi(color[1:3], 16) / 255.0              r = string.atoi(color[1:3], 16) / 255.0
# Line 57  def parse_color(color): Line 81  def parse_color(color):
81          raise ValueError(_("Invalid color specification %s") % color)          raise ValueError(_("Invalid color specification %s") % color)
82      return result      return result
83    
84    class AttrDesc:
85    
86  class XMLReader(xml.sax.handler.ContentHandler):      def __init__(self, name, required = False, default = "",
87                     conversion = None):
88      # Dictionary mapping element names (or (URI, element name) pairs for          if not isinstance(name, tuple):
89      # documents using namespaces) to method names. The methods should              fullname = (None, name)
     # accept the same parameters as the startElement (or startElementNS)  
     # methods. The start_dispatcher is used by the default startElement  
     # and startElementNS methods to call a method for the open tag of an  
     # element.  
     start_dispatcher = {}  
   
     # end_dispatcher works just like start_dispatcher but it's used by  
     # endElement and endElementNS. The method whose names it maps to  
     # should accept the same parameters as endElement and endElementNS.  
     end_dispatcher = {}  
   
   
     def __init__(self):  
         self.chars = ''  
         self.__parser = None  
         self.__directory = ""  
         self.__dispatchers = {}  
   
     def read(self, file_or_filename):  
   
         if hasattr(file_or_filename, "write"):  
             # it's a file object  
             self.__directory = ""  
             self.__file = file_or_filename  
90          else:          else:
91              filename = file_or_filename              fullname = name
92              self.__directory = os.path.dirname(filename)              name = name[1]
93              self.__file = open(filename)          self.name = name
94            self.fullname = fullname
95          if self.__parser is None:          self.required = required
96              self.__parser = make_parser()          self.default = default
97              self.__parser.setContentHandler(self)          self.conversion = conversion
             self.__parser.setErrorHandler(ErrorHandler())  
             self.__parser.setFeature(xml.sax.handler.feature_namespaces, 1)  
   
             #  
             # Well, this isn't pretty, but it appears that if you  
             # use Python 2.2 without the site-package _xmlplus then  
             # the following will fail, and without them it will work.  
             # However, if you do have the site-package and you don't  
             # call these functions, the reader raises an exception  
             #  
             # The reason we set these to 0 in the first place is  
             # because there is an unresolved issue with external  
             # entities causing an exception in the reader  
             #  
             try:  
                 self.__parser.setFeature(xml.sax.handler.feature_validation,0)  
                 self.__parser.setFeature(xml.sax.handler.feature_external_ges,0)  
                 self.__parser.setFeature(xml.sax.handler.feature_external_pes,0)  
             except SAXNotRecognizedException:  
                 pass  
   
         self.__parser.parse(self.__file)  
   
         self.close()  
   
     def close(self):  
         self.__file.close()  
           
     def GetFileName(self):  
         if hasattr(self.__file, "name"):  
             return self.__file.name  
   
         return ""  
98    
99      def GetDirectory(self):          # set by the SessionLoader's check_attrs method
100          return self.__directory          self.value = None
101    
102    
     def AddDispatchers(self, dict):  
         self.__dispatchers.update(dict)  
   
         #for key, (start, end) in dict.iteritems():  
             #if start is not None: self.start_dispatcher[key] = start  
             #if end   is not None: self.end_dispatcher[key]   = end  
   
     def startElementNS(self, name, qname, attrs):  
         """Call the method given for name in self.start_dispatcher  
         """  
         if name[0] is None:  
             method_name = self.__dispatchers.get(name[1])  
             #method_name = self.start_dispatcher.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.__dispatchers.get(name)  
         if method_name is not None \  
             and method_name[0] is not None:  
             getattr(self, method_name[0])(name, qname, attrs)  
   
     def endElementNS(self, name, qname):  
         """Call the method given for name in self.end_dispatcher  
         """  
         if name[0] is None:  
             method_name = self.__dispatchers.get(name[1])  
             #method_name = self.end_dispatcher.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.__dispatchers.get(name)  
         if method_name is not None \  
             and method_name[1] is not None:  
             getattr(self, method_name[1])(name, qname)  
   
103  class SessionLoader(XMLReader):  class SessionLoader(XMLReader):
104    
105      def __init__(self):      def __init__(self, db_connection_callback = None,
106                           shapefile_callback = None):
107          """Inititialize the Sax handler."""          """Inititialize the Sax handler."""
108          XMLReader.__init__(self)          XMLReader.__init__(self)
109    
110            self.db_connection_callback = db_connection_callback
111            self.shapefile_callback = shapefile_callback
112          self.theSession = None          self.theSession = None
113          self.aMap = None          self.aMap = None
114          self.aLayer = None          self.aLayer = None
115    
116          XMLReader.AddDispatchers(self,          # Map ids used in the thuban file to the corresponding objects
117              {'session'       : ("start_session",        "end_session"),          # in the session
118               'map'           : ("start_map",            "end_map"),          self.idmap = {}
119               'projection'    : ("start_projection",     "end_projection"),  
120               'parameter'     : ("start_parameter",      None),          dispatchers = {
121               'layer'         : ("start_layer",          "end_layer"),              'session'       : ("start_session",        "end_session"),
122               'classification': ("start_classification", "end_classification"),  
123               'clnull'        : ("start_clnull",         "end_clnull"),              'dbconnection': ("start_dbconnection", None),
124               'clpoint'       : ("start_clpoint",        "end_clpoint"),  
125               'clrange'       : ("start_clrange",        "end_clrange"),              'dbshapesource': ("start_dbshapesource", None),
126               'cldata'        : ("start_cldata",         "end_cldata"),              'fileshapesource': ("start_fileshapesource", None),
127               'table'         : ("start_table",          "end_table"),              'derivedshapesource': ("start_derivedshapesource", None),
128               'labellayer'    : ("start_labellayer",     None),              'filetable': ("start_filetable", None),
129               'label'         : ("start_label",          None)})              'jointable': ("start_jointable", None),
130    
131                'map'           : ("start_map",            "end_map"),
132                'projection'    : ("start_projection",     "end_projection"),
133                'parameter'     : ("start_parameter",      None),
134                'layer'         : ("start_layer",          "end_layer"),
135                'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
136                'classification': ("start_classification", "end_classification"),
137                'clnull'        : ("start_clnull",         "end_clnull"),
138                'clpoint'       : ("start_clpoint",        "end_clpoint"),
139                'clrange'       : ("start_clrange",        "end_clrange"),
140                'clpattern'     : ("start_clpattern",      "end_clpattern"),
141                'cldata'        : ("start_cldata",         "end_cldata"),
142                'table'         : ("start_table",          "end_table"),
143                'labellayer'    : ("start_labellayer",     None),
144                'label'         : ("start_label",          None)}
145    
146            # all dispatchers should be used for the 0.8 and 0.9 namespaces too
147            for xmlns in ("http://thuban.intevation.org/dtds/thuban-0.8.dtd",
148                          "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd",
149                          "http://thuban.intevation.org/dtds/thuban-0.9.dtd",
150                          "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd",
151                          "http://thuban.intevation.org/dtds/thuban-1.0rc1.dtd",
152                          "http://thuban.intevation.org/dtds/thuban-1.0.0.dtd",
153                          "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"):
154                for key, value in dispatchers.items():
155                    dispatchers[(xmlns, key)] = value
156    
157            XMLReader.AddDispatchers(self, dispatchers)
158    
159        def Destroy(self):
160            """Clear all instance variables to cut cyclic references.
161    
162            The GC would have collected the loader eventually but it can
163            happen that it doesn't run at all until Thuban is closed (2.3
164            but not 2.2 tries a bit harder and forces a collection when the
165            interpreter terminates)
166            """
167            self.__dict__.clear()
168    
169      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
170          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'),
171                                                            None)))
172    
173      def end_session(self, name, qname):      def end_session(self, name, qname):
174          pass          pass
175    
176        def check_attrs(self, element, attrs, descr):
177            """Check and convert some of the attributes of an element
178    
179            Parameters:
180               element -- The element name
181               attrs -- The attrs mapping as passed to the start_* methods
182               descr -- Sequence of attribute descriptions (AttrDesc instances)
183    
184            Return a dictionary containig normalized versions of the
185            attributes described in descr. The keys of that dictionary are
186            the name attributes of the attribute descriptions. The attrs
187            dictionary will not be modified.
188    
189            If the attribute is required, i.e. the 'required' attribute of
190            the descrtiption is true, but it is not in attrs, raise a
191            LoadError.
192    
193            If the attribute has a default value and it is not present in
194            attrs, use that default value as the value in the returned dict.
195    
196            The value is converted before putting it into the returned dict.
197            The following conversions are available:
198    
199               'filename' -- The attribute is a filename.
200    
201                             If the filename is a relative name, interpret
202                             it relative to the directory containing the
203                             .thuban file and make it an absolute name
204    
205               'shapestore' -- The attribute is the ID of a shapestore
206                               defined earlier in the .thuban file. Look it
207                               up self.idmap
208    
209               'table' -- The attribute is the ID of a table or shapestore
210                          defined earlier in the .thuban file. Look it up
211                          self.idmap. If it's the ID of a shapestore the
212                          value will be the table of the shapestore.
213    
214               'idref' -- The attribute is the id of an object defined
215                          earlier in the .thuban file. Look it up self.idmap
216    
217               'ascii' -- The attribute is converted to a bytestring with
218                          ascii encoding.
219    
220               a callable -- The attribute value is passed to the callable
221                             and the return value is used as the converted
222                             value
223    
224            If no conversion is specified for an attribute it is converted
225            with self.encode.
226            """
227            normalized = {}
228    
229            for d in descr:
230                if d.required and not attrs.has_key(d.fullname):
231                    raise LoadError("Element %s requires an attribute %r"
232                                    % (element, d.name))
233                value = attrs.get(d.fullname, d.default)
234    
235                if d.conversion in ("idref", "shapesource"):
236                    if value in self.idmap:
237                        value = self.idmap[value]
238                    else:
239                        raise LoadError("Element %s requires an already defined ID"
240                                        " in attribute %r"
241                                        % (element, d.name))
242                elif d.conversion == "table":
243                    if value in self.idmap:
244                        value = self.idmap[value]
245                        if isinstance(value, ShapefileStore):
246                            value = value.Table()
247                    else:
248                        raise LoadError("Element %s requires an already defined ID"
249                                        " in attribute %r"
250                                        % (element, d.name))
251                elif d.conversion == "filename":
252                    value = os.path.abspath(os.path.join(self.GetDirectory(),
253                                                         self.encode(value)))
254                elif d.conversion == "ascii":
255                    value = value.encode("ascii")
256                elif d.conversion:
257                    # Assume it's a callable
258                    value = d.conversion(value)
259                else:
260                   value = self.encode(value)
261    
262                normalized[d.name] = value
263            return normalized
264    
265        def open_shapefile(self, filename):
266            """Open shapefile, with alternative path handling.
267            
268               If a shapefile cannot be opened and an IOError is raised, check for
269               an alternative. This alternative can be specified interactively by
270               the user or taken from a list of (potential) locations, depending on
271               the callback implementation.
272                
273               The alternative is rechecked. If taken from a list the user
274               has to confirm the alternative.
275            """
276    
277            # Flag if the alternative path was specified interactively / from list.
278            from_list = 0
279            while 1:
280                try:
281                    store = self.theSession.OpenShapefile(filename)
282                    if from_list:
283                        # A valid path has been guessed from a list
284                        # Let the user confirm - or select an alternative.
285                        filename, from_list = self.shapefile_callback(
286                                                filename, "check")
287                        if filename is None:
288                            # Selection cancelled
289                            raise LoadCancelled
290                        elif store.FileName() == filename:
291                            # Proposed file has been accepted
292                            break
293                        else:
294                            # the filename has been changed, try the new file
295                            pass
296                    else:
297                        break
298                except IOError:
299                    if self.shapefile_callback is not None:
300                        filename, from_list = self.shapefile_callback(
301                                                filename,
302                                                mode = "search",
303                                                second_try = from_list)
304                        if filename is None:
305                            raise LoadCancelled
306                    else:
307                        raise
308            return store
309    
310        def start_dbconnection(self, name, qname, attrs):
311            attrs = self.check_attrs(name, attrs,
312                                     [AttrDesc("id", True),
313                                      AttrDesc("dbtype", True),
314                                      AttrDesc("host", False, ""),
315                                      AttrDesc("port", False, ""),
316                                      AttrDesc("user", False, ""),
317                                      AttrDesc("dbname", True)])
318            ID = attrs["id"]
319            dbtype = attrs["dbtype"]
320            if dbtype != "postgis":
321                raise LoadError("dbtype %r not supported" % filetype)
322    
323            del attrs["id"]
324            del attrs["dbtype"]
325    
326            # Try to open the connection and if it fails ask the user for
327            # the correct parameters repeatedly.
328            # FIXME: it would be better not to insist on getting a
329            # connection here. We should handle this more like the raster
330            # images where the layers etc still are created but are not
331            # drawn in case Thuban can't use the data for various reasons
332            while 1:
333                try:
334                    conn = postgisdb.PostGISConnection(**attrs)
335                    break
336                except postgisdb.ConnectionError, val:
337                    if self.db_connection_callback is not None:
338                        attrs = self.db_connection_callback(attrs, str(val))
339                        if attrs is None:
340                            raise LoadCancelled
341                    else:
342                        raise
343    
344            self.idmap[ID] = conn
345            self.theSession.AddDBConnection(conn)
346    
347        def start_dbshapesource(self, name, qname, attrs):
348            attrs = self.check_attrs(name, attrs,
349                                     [AttrDesc("id", True),
350                                      AttrDesc("dbconn", True,
351                                               conversion = "idref"),
352                                      AttrDesc("tablename", True,
353                                               conversion = "ascii"),
354                                      # id_column and geometry_column were
355                                      # newly introduced with thuban-1.1.dtd
356                                      # where they're required.  Since we
357                                      # support the older formats too we
358                                      # have them optional here.
359                                      AttrDesc("id_column", False, "gid",
360                                               conversion = "ascii"),
361                                      AttrDesc("geometry_column", False,
362                                               conversion = "ascii")])
363            # The default value of geometry_column to use when instantiating
364            # the db shapestore is None which we currently can't easily use
365            # in check_attrs
366            geometry_column = attrs["geometry_column"]
367            if not geometry_column:
368                geometry_column = None
369            dbopen = self.theSession.OpenDBShapeStore
370            self.idmap[attrs["id"]] = dbopen(attrs["dbconn"], attrs["tablename"],
371                                             id_column = attrs["id_column"],
372                                             geometry_column=geometry_column)
373    
374        def start_fileshapesource(self, name, qname, attrs):
375            attrs = self.check_attrs(name, attrs,
376                                      [AttrDesc("id", True),
377                                       AttrDesc("filename", True,
378                                                conversion = "filename"),
379                                       AttrDesc("filetype", True)])
380            ID = attrs["id"]
381            filename = attrs["filename"]
382            filetype = attrs["filetype"]
383            if filetype != "shapefile":
384                raise LoadError("shapesource filetype %r not supported" % filetype)
385            self.idmap[ID] = self.open_shapefile(filename)
386    
387        def start_derivedshapesource(self, name, qname, attrs):
388            attrs = self.check_attrs(name, attrs,
389                                     [AttrDesc("id", True),
390                                      AttrDesc("shapesource", True,
391                                               conversion = "shapesource"),
392                                      AttrDesc("table", True, conversion="table")])
393            store = DerivedShapeStore(attrs["shapesource"], attrs["table"])
394            self.theSession.AddShapeStore(store)
395            self.idmap[attrs["id"]] = store
396    
397        def start_filetable(self, name, qname, attrs):
398            attrs = self.check_attrs(name, attrs,
399                                     [AttrDesc("id", True),
400                                      AttrDesc("title", True),
401                                      AttrDesc("filename", True,
402                                               conversion = "filename"),
403                                      AttrDesc("filetype")])
404            filetype = attrs["filetype"]
405            if filetype != "DBF":
406                raise LoadError("shapesource filetype %r not supported" % filetype)
407            table = DBFTable(attrs["filename"])
408            table.SetTitle(attrs["title"])
409            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
410    
411        def start_jointable(self, name, qname, attrs):
412            attrs = self.check_attrs(name, attrs,
413                                     [AttrDesc("id", True),
414                                      AttrDesc("title", True),
415                                      AttrDesc("left", True, conversion="table"),
416                                      AttrDesc("leftcolumn", True),
417                                      AttrDesc("right", True, conversion="table"),
418                                      AttrDesc("rightcolumn", True),
419    
420                                      # jointype is required for file
421                                      # version 0.9 but this attribute
422                                      # wasn't in the 0.8 version because of
423                                      # an oversight so we assume it's
424                                      # optional since we want to handle
425                                      # both file format versions here.
426                                      AttrDesc("jointype", False,
427                                               default="INNER")])
428    
429            jointype = attrs["jointype"]
430            if jointype == "LEFT OUTER":
431                outer_join = True
432            elif jointype == "INNER":
433                outer_join = False
434            else:
435                raise LoadError("jointype %r not supported" % jointype )
436            table = TransientJoinedTable(self.theSession.TransientDB(),
437                                         attrs["left"], attrs["leftcolumn"],
438                                         attrs["right"], attrs["rightcolumn"],
439                                         outer_join = outer_join)
440            table.SetTitle(attrs["title"])
441            self.idmap[attrs["id"]] = self.theSession.AddTable(table)
442    
443      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
444          """Start a map."""          """Start a map."""
445          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(self.encode(attrs.get((None, 'title'), None)))
446    
447      def end_map(self, name, qname):      def end_map(self, name, qname):
448          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
449            self.aMap = None
450    
451      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
452          self.ProjectionParams = [ ]          attrs = self.check_attrs(name, attrs,
453                                     [AttrDesc("name", conversion=self.encode),
454                                      AttrDesc("epsg", default=None,
455                                               conversion=self.encode)])
456            self.projection_name = attrs["name"]
457            self.projection_epsg = attrs["epsg"]
458            self.projection_params = [ ]
459    
460      def end_projection(self, name, qname):      def end_projection(self, name, qname):
461          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
462                obj = self.aLayer
463            elif self.aMap is not None:
464                obj = self.aMap
465            else:
466                assert False, "projection tag out of context"
467                pass
468    
469            obj.SetProjection(Projection(self.projection_params,
470                                         self.projection_name,
471                                         epsg = self.projection_epsg))
472    
473      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
474          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
475          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
476          self.ProjectionParams.append(s)          self.projection_params.append(s)
477    
478      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
479          """Start a layer          """Start a layer
# Line 221  class SessionLoader(XMLReader): Line 482  class SessionLoader(XMLReader):
482          attrs which may be a dictionary as well as the normal SAX attrs          attrs which may be a dictionary as well as the normal SAX attrs
483          object and bind it to self.aLayer.          object and bind it to self.aLayer.
484          """          """
485          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
486          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
487          filename = os.path.join(self.GetDirectory(), filename)          filename = os.path.join(self.GetDirectory(), filename)
488            filename = self.encode(filename)
489            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
490          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
491          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
492          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
493          self.aLayer = layer_class(title, filename, fill = fill,          if attrs.has_key((None, "shapestore")):
494                                    stroke = stroke, lineWidth = stroke_width)              store = self.idmap[attrs[(None, "shapestore")]]
495            else:
496                store = self.open_shapefile(filename)
497    
498            self.aLayer = layer_class(title, store,
499                                      fill = fill, stroke = stroke,
500                                      lineWidth = stroke_width,
501                                      visible = visible)
502    
503      def end_layer(self, name, qname):      def end_layer(self, name, qname):
504          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
505            self.aLayer = None
506    
507        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
508            title = self.encode(attrs.get((None, 'title'), ""))
509            filename = attrs.get((None, 'filename'), "")
510            filename = os.path.join(self.GetDirectory(), filename)
511            filename = self.encode(filename)
512            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
513            opacity  = float(attrs.get((None, 'opacity'), "1"))
514            masktype = str(attrs.get((None, 'masktype'), "bit"))
515    
516            masktypes = {"none": layer_class.MASK_NONE,
517                         "bit":  layer_class.MASK_BIT,
518                         "alpha": layer_class.MASK_ALPHA}
519    
520            self.aLayer = layer_class(title, filename,
521                                      visible = visible,
522                                      opacity = opacity,
523                                      masktype = masktypes[masktype])
524    
525        def end_rasterlayer(self, name, qname):
526            self.aMap.AddLayer(self.aLayer)
527            self.aLayer = None
528    
529      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
530          field = attrs.get((None, 'field'), None)          # field and field_type are optional because the classification
531            # can also be empty, ie. have only a default.
532            attrs = self.check_attrs(name, attrs,
533                                     [AttrDesc("field", False),
534                                      AttrDesc("field_type", False)])
535    
536            field = attrs["field"]
537            fieldType = attrs["field_type"]
538    
539            if field == "": return # no need to set classification column.
540    
         fieldType = attrs.get((None, 'field_type'), None)  
541          dbFieldType = self.aLayer.GetFieldType(field)          dbFieldType = self.aLayer.GetFieldType(field)
542    
543          if fieldType != dbFieldType:          if fieldType != dbFieldType:
# Line 251  class SessionLoader(XMLReader): Line 552  class SessionLoader(XMLReader):
552          elif fieldType == FIELDTYPE_DOUBLE:          elif fieldType == FIELDTYPE_DOUBLE:
553              self.conv = float              self.conv = float
554    
555          self.aLayer.GetClassification().SetField(field)          self.aLayer.SetClassificationColumn(field)
   
556    
557      def end_classification(self, name, qname):      def end_classification(self, name, qname):
558          pass          pass
559    
560      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
561          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
562          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
563          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
564    
565      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
# Line 270  class SessionLoader(XMLReader): Line 570  class SessionLoader(XMLReader):
570      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
571          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
572    
573          #try:          field = self.aLayer.GetClassificationColumn()
574              #value  = Str2Num(attrib_value)          if self.aLayer.GetFieldType(field) == FIELDTYPE_STRING:
575          #except:              value = self.encode(attrib_value)
576              #value  = attrib_value          else:
577                value = self.conv(attrib_value)
         value = self.conv(attrib_value)  
   
578          self.cl_group = ClassGroupSingleton(value)          self.cl_group = ClassGroupSingleton(value)
579          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
580          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
581    
582    
# Line 288  class SessionLoader(XMLReader): Line 586  class SessionLoader(XMLReader):
586          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
587    
588      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
589            attrs = self.check_attrs(name, attrs,
590                                     [AttrDesc("range", False, None),
591                                      AttrDesc("min", False, None),
592                                      AttrDesc("max", False, None)])
593    
594            range = attrs['range']
595            # for backward compatibility (min/max are not saved)
596            min   = attrs['min']
597            max   = attrs['max']
598    
599          try:          try:
600              min = self.conv(attrs.get((None, 'min'), "0"))              if range is not None:
601              max = self.conv(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
602              #min = Str2Num(attrs.get((None, 'min'), "0"))              elif min is not None and max is not None:
603              #max = Str2Num(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange((self.conv(min),
604                                                     self.conv(max)))
605                else:
606                    self.cl_group = ClassGroupRange(Range(None))
607    
608          except ValueError:          except ValueError:
609              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
610    
         self.cl_group = ClassGroupRange(min, max)  
611          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
612          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
613    
# Line 307  class SessionLoader(XMLReader): Line 617  class SessionLoader(XMLReader):
617          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
618          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
619    
620    
621        def start_clpattern(self, name, qname, attrs):
622            pattern = attrs.get((None, 'pattern'), "")
623    
624            self.cl_group = ClassGroupPattern(self.encode(pattern))
625            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
626            self.cl_prop = ClassGroupProperties()
627    
628        def end_clpattern(self, name, qname):
629            self.cl_group.SetProperties(self.cl_prop)
630            self.aLayer.GetClassification().AppendGroup(self.cl_group)
631            del self.cl_group, self.cl_prop
632    
633    
634      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
635          self.cl_prop.SetLineColor(          self.cl_prop.SetLineColor(
636              parse_color(attrs.get((None, 'stroke'), "None")))              parse_color(attrs.get((None, 'stroke'), "None")))
637          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
638              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
639            self.cl_prop.SetSize(int(attrs.get((None, 'size'), "5")))
640          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
641    
642      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
643          pass          pass
644    
     def start_table(self, name, qname, attrs):  
         #print "table title: %s" % attrs.get('title', None)  
         pass  
   
     def end_table(self, name, qname):  
         pass  
   
645      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
646          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
647    
648      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
649          x = float(attrs[(None, 'x')])          attrs = self.check_attrs(name, attrs,
650          y = float(attrs[(None, 'y')])                                   [AttrDesc("x", True, conversion = float),
651          text = attrs[(None, 'text')]                                    AttrDesc("y", True, conversion = float),
652          halign = attrs[(None, 'halign')]                                    AttrDesc("text", True),
653          valign = attrs[(None, 'valign')]                                    AttrDesc("halign", True,
654                                               conversion = "ascii"),
655                                      AttrDesc("valign", True,
656                                               conversion = "ascii")])
657            x = attrs['x']
658            y = attrs['y']
659            text = attrs['text']
660            halign = attrs['halign']
661            valign = attrs['valign']
662            if halign not in ("left", "center", "right"):
663                raise LoadError("Unsupported halign value %r" % halign)
664            if valign not in ("top", "center", "bottom"):
665                raise LoadError("Unsupported valign value %r" % valign)
666          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
667    
668      def characters(self, chars):      def characters(self, chars):
669          pass          pass
670    
671    
672  def load_session(filename):  def load_session(filename, db_connection_callback = None,
673      """Load a Thuban session from the file object file"""                             shapefile_callback = None):
674        """Load a Thuban session from the file object file
675      handler = SessionLoader()  
676        The db_connection_callback, if given should be a callable object
677        that can be called like this:
678           db_connection_callback(params, message)
679    
680        where params is a dictionary containing the known connection
681        parameters and message is a string with a message why the connection
682        failed. db_connection_callback should return a new dictionary with
683        corrected and perhaps additional parameters like a password or None
684        to indicate that the user cancelled.
685        """
686        handler = SessionLoader(db_connection_callback, shapefile_callback)
687      handler.read(filename)      handler.read(filename)
688    
689      session = handler.theSession      session = handler.theSession
690      # Newly loaded session aren't modified      # Newly loaded session aren't modified
691      session.UnsetModified()      session.UnsetModified()
692    
693        handler.Destroy()
694    
695      return session      return session
696    
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