/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 2104 by bh, Fri Mar 12 12:19:15 2004 UTC revision 2642 by bh, Fri Jul 1 20:49:04 2005 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002, 2003, 2004 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 100  class AttrDesc: Line 101  class AttrDesc:
101    
102  class SessionLoader(XMLReader):  class SessionLoader(XMLReader):
103    
104      def __init__(self, db_connection_callback = None):      def __init__(self, db_connection_callback = None,
105                           shapefile_callback = None):
106          """Inititialize the Sax handler."""          """Inititialize the Sax handler."""
107          XMLReader.__init__(self)          XMLReader.__init__(self)
108    
109          self.db_connection_callback = db_connection_callback          self.db_connection_callback = db_connection_callback
110            self.shapefile_callback = shapefile_callback
111          self.theSession = None          self.theSession = None
112          self.aMap = None          self.aMap = None
113          self.aLayer = None          self.aLayer = None
# Line 246  class SessionLoader(XMLReader): Line 248  class SessionLoader(XMLReader):
248                                      % (element, d.name))                                      % (element, d.name))
249              elif d.conversion == "filename":              elif d.conversion == "filename":
250                  value = os.path.abspath(os.path.join(self.GetDirectory(),                  value = os.path.abspath(os.path.join(self.GetDirectory(),
251                                                       value))                                                       self.encode(value)))
252              elif d.conversion == "ascii":              elif d.conversion == "ascii":
253                  value = value.encode("ascii")                  value = value.encode("ascii")
254              elif d.conversion:              elif d.conversion:
# Line 258  class SessionLoader(XMLReader): Line 260  class SessionLoader(XMLReader):
260              normalized[d.name] = value              normalized[d.name] = value
261          return normalized          return normalized
262    
263        def open_shapefile(self, filename):
264            """Open shapefile, with alternative path handling.
265            
266               If a shapefile cannot be opened and an IOError is raised, check for
267               an alternative. This alternative can be specified interactively by
268               the user or taken from a list of (potential) locations, depending on
269               the callback implementation.
270                
271               The alternative is rechecked. If taken from a list the user
272               has to confirm the alternative.
273            """
274    
275            # Flag if the alternative path was specified interactively / from list.
276            from_list = 0
277            while 1:
278                try:
279                    store = self.theSession.OpenShapefile(filename)
280                    if from_list:
281                        # A valid path has been guessed from a list
282                        # Let the user confirm - or select an alternative.
283                        filename, from_list = self.shapefile_callback(
284                                                filename, "check")
285                        if filename is None:
286                            # Selection cancelled
287                            raise LoadCancelled
288                        elif store.FileName() == filename:
289                            # Proposed file has been accepted
290                            break
291                        else:
292                            # the filename has been changed, try the new file
293                            pass
294                    else:
295                        break
296                except IOError:
297                    if self.shapefile_callback is not None:
298                        filename, from_list = self.shapefile_callback(
299                                                filename,
300                                                mode = "search",
301                                                second_try = from_list)
302                        if filename is None:
303                            raise LoadCancelled
304                    else:
305                        raise
306            return store
307    
308      def start_dbconnection(self, name, qname, attrs):      def start_dbconnection(self, name, qname, attrs):
309          attrs = self.check_attrs(name, attrs,          attrs = self.check_attrs(name, attrs,
310                                   [AttrDesc("id", True),                                   [AttrDesc("id", True),
# Line 333  class SessionLoader(XMLReader): Line 380  class SessionLoader(XMLReader):
380          filetype = attrs["filetype"]          filetype = attrs["filetype"]
381          if filetype != "shapefile":          if filetype != "shapefile":
382              raise LoadError("shapesource filetype %r not supported" % filetype)              raise LoadError("shapesource filetype %r not supported" % filetype)
383          self.idmap[ID] = self.theSession.OpenShapefile(filename)          self.idmap[ID] = self.open_shapefile(filename)
384    
385      def start_derivedshapesource(self, name, qname, attrs):      def start_derivedshapesource(self, name, qname, attrs):
386          attrs = self.check_attrs(name, attrs,          attrs = self.check_attrs(name, attrs,
# Line 444  class SessionLoader(XMLReader): Line 491  class SessionLoader(XMLReader):
491          if attrs.has_key((None, "shapestore")):          if attrs.has_key((None, "shapestore")):
492              store = self.idmap[attrs[(None, "shapestore")]]              store = self.idmap[attrs[(None, "shapestore")]]
493          else:          else:
494              store = self.theSession.OpenShapefile(filename)              store = self.open_shapefile(filename)
495    
496          self.aLayer = layer_class(title, store,          self.aLayer = layer_class(title, store,
497                                    fill = fill, stroke = stroke,                                    fill = fill, stroke = stroke,
498                                    lineWidth = stroke_width,                                    lineWidth = stroke_width,
# Line 460  class SessionLoader(XMLReader): Line 508  class SessionLoader(XMLReader):
508          filename = os.path.join(self.GetDirectory(), filename)          filename = os.path.join(self.GetDirectory(), filename)
509          filename = self.encode(filename)          filename = self.encode(filename)
510          visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"          visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
511            opacity  = float(attrs.get((None, 'opacity'), "1"))
512            masktype = str(attrs.get((None, 'masktype'), "bit"))
513    
514          self.aLayer = layer_class(title, filename, visible = visible)          masktypes = {"none": layer_class.MASK_NONE,
515                         "bit":  layer_class.MASK_BIT,
516                         "alpha": layer_class.MASK_ALPHA}
517    
518            self.aLayer = layer_class(title, filename,
519                                      visible = visible,
520                                      opacity = opacity,
521                                      masktype = masktypes[masktype])
522    
523      def end_rasterlayer(self, name, qname):      def end_rasterlayer(self, name, qname):
524          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
# Line 522  class SessionLoader(XMLReader): Line 579  class SessionLoader(XMLReader):
579          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
580    
581      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
582            attrs = self.check_attrs(name, attrs,
583                                     [AttrDesc("range", False, None),
584                                      AttrDesc("min", False, None),
585                                      AttrDesc("max", False, None)])
586    
587          range = attrs.get((None, 'range'), None)          range = attrs['range']
588          # for backward compatibility (min/max are not saved)          # for backward compatibility (min/max are not saved)
589          min   = attrs.get((None, 'min'), None)          min   = attrs['min']
590          max   = attrs.get((None, 'max'), None)          max   = attrs['max']
591    
592          try:          try:
593              if range is not None:              if range is not None:
# Line 554  class SessionLoader(XMLReader): Line 615  class SessionLoader(XMLReader):
615              parse_color(attrs.get((None, 'stroke'), "None")))              parse_color(attrs.get((None, 'stroke'), "None")))
616          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
617              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
618            self.cl_prop.SetSize(int(attrs.get((None, 'size'), "5")))
619          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
620    
621      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
# Line 586  class SessionLoader(XMLReader): Line 648  class SessionLoader(XMLReader):
648          pass          pass
649    
650    
651  def load_session(filename, db_connection_callback = None):  def load_session(filename, db_connection_callback = None,
652                               shapefile_callback = None):
653      """Load a Thuban session from the file object file      """Load a Thuban session from the file object file
654    
655      The db_connection_callback, if given should be a callable object      The db_connection_callback, if given should be a callable object
# Line 599  def load_session(filename, db_connection Line 662  def load_session(filename, db_connection
662      corrected and perhaps additional parameters like a password or None      corrected and perhaps additional parameters like a password or None
663      to indicate that the user cancelled.      to indicate that the user cancelled.
664      """      """
665      handler = SessionLoader(db_connection_callback)      handler = SessionLoader(db_connection_callback, shapefile_callback)
666      handler.read(filename)      handler.read(filename)
667    
668      session = handler.theSession      session = handler.theSession
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