/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 1970 by bh, Mon Nov 24 18:36:00 2003 UTC revision 2551 by jonathan, Thu Jan 27 14:19:41 2005 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002, 2003 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003, 2004 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 143  class SessionLoader(XMLReader): Line 145  class SessionLoader(XMLReader):
145          for xmlns in ("http://thuban.intevation.org/dtds/thuban-0.8.dtd",          for xmlns in ("http://thuban.intevation.org/dtds/thuban-0.8.dtd",
146                        "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd",                        "http://thuban.intevation.org/dtds/thuban-0.9-dev.dtd",
147                        "http://thuban.intevation.org/dtds/thuban-0.9.dtd",                        "http://thuban.intevation.org/dtds/thuban-0.9.dtd",
148                        "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"):                        "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd",
149                          "http://thuban.intevation.org/dtds/thuban-1.0rc1.dtd",
150                          "http://thuban.intevation.org/dtds/thuban-1.0.0.dtd",
151                          "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"):
152              for key, value in dispatchers.items():              for key, value in dispatchers.items():
153                  dispatchers[(xmlns, key)] = value                  dispatchers[(xmlns, key)] = value
154    
# Line 255  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 298  class SessionLoader(XMLReader): Line 348  class SessionLoader(XMLReader):
348                                    AttrDesc("dbconn", True,                                    AttrDesc("dbconn", True,
349                                             conversion = "idref"),                                             conversion = "idref"),
350                                    AttrDesc("tablename", True,                                    AttrDesc("tablename", True,
351                                               conversion = "ascii"),
352                                      # id_column and geometry_column were
353                                      # newly introduced with thuban-1.1.dtd
354                                      # where they're required.  Since we
355                                      # support the older formats too we
356                                      # have them optional here.
357                                      AttrDesc("id_column", False, "gid",
358                                               conversion = "ascii"),
359                                      AttrDesc("geometry_column", False,
360                                             conversion = "ascii")])                                             conversion = "ascii")])
361          ID = attrs["id"]          # The default value of geometry_column to use when instantiating
362          db = attrs["dbconn"]          # the db shapestore is None which we currently can't easily use
363          tablename = attrs["tablename"]          # in check_attrs
364          self.idmap[ID] = self.theSession.OpenDBShapeStore(db, tablename)          geometry_column = attrs["geometry_column"]
365            if not geometry_column:
366                geometry_column = None
367            dbopen = self.theSession.OpenDBShapeStore
368            self.idmap[attrs["id"]] = dbopen(attrs["dbconn"], attrs["tablename"],
369                                             id_column = attrs["id_column"],
370                                             geometry_column=geometry_column)
371    
372      def start_fileshapesource(self, name, qname, attrs):      def start_fileshapesource(self, name, qname, attrs):
373          attrs = self.check_attrs(name, attrs,          attrs = self.check_attrs(name, attrs,
# Line 315  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 426  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 442  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            useMask = self.encode(attrs.get((None, 'use_mask'), "false")) != "false"
512    
513          self.aLayer = layer_class(title, filename, visible = visible)          self.aLayer = layer_class(title, filename, visible = visible)
514    
515            self.aLayer.SetUseMask(useMask)
516    
517      def end_rasterlayer(self, name, qname):      def end_rasterlayer(self, name, qname):
518          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
519          self.aLayer = None          self.aLayer = None
# Line 536  class SessionLoader(XMLReader): Line 605  class SessionLoader(XMLReader):
605              parse_color(attrs.get((None, 'stroke'), "None")))              parse_color(attrs.get((None, 'stroke'), "None")))
606          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
607              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
608            self.cl_prop.SetSize(int(attrs.get((None, 'size'), "5")))
609          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
610    
611      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
# Line 545  class SessionLoader(XMLReader): Line 615  class SessionLoader(XMLReader):
615          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
616    
617      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
618          x = float(attrs[(None, 'x')])          attrs = self.check_attrs(name, attrs,
619          y = float(attrs[(None, 'y')])                                   [AttrDesc("x", True, conversion = float),
620          text = self.encode(attrs[(None, 'text')])                                    AttrDesc("y", True, conversion = float),
621          halign = attrs[(None, 'halign')]                                    AttrDesc("text", True),
622          valign = attrs[(None, 'valign')]                                    AttrDesc("halign", True,
623                                               conversion = "ascii"),
624                                      AttrDesc("valign", True,
625                                               conversion = "ascii")])
626            x = attrs['x']
627            y = attrs['y']
628            text = attrs['text']
629            halign = attrs['halign']
630            valign = attrs['valign']
631            if halign not in ("left", "center", "right"):
632                raise LoadError("Unsupported halign value %r" % halign)
633            if valign not in ("top", "center", "bottom"):
634                raise LoadError("Unsupported valign value %r" % valign)
635          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
636    
637      def characters(self, chars):      def characters(self, chars):
638          pass          pass
639    
640    
641  def load_session(filename, db_connection_callback = None):  def load_session(filename, db_connection_callback = None,
642                               shapefile_callback = None):
643      """Load a Thuban session from the file object file      """Load a Thuban session from the file object file
644    
645      The db_connection_callback, if given should be a callable object      The db_connection_callback, if given should be a callable object
# Line 569  def load_session(filename, db_connection Line 652  def load_session(filename, db_connection
652      corrected and perhaps additional parameters like a password or None      corrected and perhaps additional parameters like a password or None
653      to indicate that the user cancelled.      to indicate that the user cancelled.
654      """      """
655      handler = SessionLoader(db_connection_callback)      handler = SessionLoader(db_connection_callback, shapefile_callback)
656      handler.read(filename)      handler.read(filename)
657    
658      session = handler.theSession      session = handler.theSession
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