/[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 267 by bh, Thu Aug 22 10:25:30 2002 UTC revision 1159 by jonathan, Thu Jun 12 12:40:27 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]>  # 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 12  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  import xml.sax
19  import xml.sax.handler  import xml.sax.handler
20  from xml.sax import make_parser, ErrorHandler  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.session import Session  from Thuban.Model.session import Session
28  from Thuban.Model.map import Map  from Thuban.Model.map import Map
29  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer, RasterLayer
30  from Thuban.Model.color import Color  from Thuban.Model.color import Color
31  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
32    from Thuban.Model.range import Range
33    from Thuban.Model.classification import Classification, \
34        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
35        ClassGroupProperties
36    
37    from Thuban.Model.xmlreader import XMLReader
38    import resource
39    
40  def parse_color(color):  def parse_color(color):
41      """Return the color object for the string color.      """Return the color object for the string color.
# Line 33  def parse_color(color): Line 45  def parse_color(color):
45      """      """
46      color = string.strip(color)      color = string.strip(color)
47      if color == "None":      if color == "None":
48          result = None          result = Color.Transparent
49      elif color[0] == '#':      elif color[0] == '#':
50          if len(color) == 7:          if len(color) == 7:
51              r = string.atoi(color[1:3], 16) / 255.0              r = string.atoi(color[1:3], 16) / 255.0
# Line 41  def parse_color(color): Line 53  def parse_color(color):
53              b = string.atoi(color[5:7], 16) / 255.0              b = string.atoi(color[5:7], 16) / 255.0
54              result = Color(r, g, b)              result = Color(r, g, b)
55          else:          else:
56              raise ValueError("Invalid hexadecimal color specification %s"              raise ValueError(_("Invalid hexadecimal color specification %s")
57                               % color)                               % color)
58      else:      else:
59          raise ValueError("Invalid color specification %s" % color)          raise ValueError(_("Invalid color specification %s") % color)
60      return result      return result
61    
62    class SessionLoader(XMLReader):
63    
64  class ProcessSession(xml.sax.handler.ContentHandler):      def __init__(self):
65            """Inititialize the Sax handler."""
66            XMLReader.__init__(self)
67    
     # Dictionary mapping element names (or (URI, element name) pairs for  
     # documents using amespaces) to method names. The methods should  
     # 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, directory):  
         """Inititialize the Sax handler.  
   
         The directory parameter should be the directory containing the  
         session file. It's needed to interpret embedded relative  
         filenames.  
         """  
         self.directory = directory  
         self.chars = ''  
68          self.theSession = None          self.theSession = None
69          self.aMap = None          self.aMap = None
70          self.aLayer = None          self.aLayer = None
71    
72      def startElementNS(self, name, qname, attrs):          XMLReader.AddDispatchers(self,
73          """Call the method given for name in self.start_dispatcher              {'session'       : ("start_session",        "end_session"),
74          """               'map'           : ("start_map",            "end_map"),
75          if name[0] is None:               'projection'    : ("start_projection",     "end_projection"),
76              method_name = self.start_dispatcher.get(name[1])               'parameter'     : ("start_parameter",      None),
77          else:               'layer'         : ("start_layer",          "end_layer"),
78              # Dispatch with namespace               'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
79              method_name = self.start_dispatcher.get(name)               'classification': ("start_classification", "end_classification"),
80          if method_name is not None:               'clnull'        : ("start_clnull",         "end_clnull"),
81              getattr(self, method_name)(name, qname, attrs)               'clpoint'       : ("start_clpoint",        "end_clpoint"),
82                 'clrange'       : ("start_clrange",        "end_clrange"),
83      def endElementNS(self, name, qname):               'cldata'        : ("start_cldata",         "end_cldata"),
84          """Call the method given for name in self.end_dispatcher               'table'         : ("start_table",          "end_table"),
85          """               'labellayer'    : ("start_labellayer",     None),
86          if name[0] is None:               'label'         : ("start_label",          None)})
             method_name = self.end_dispatcher.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.end_dispatcher.get(name)  
         if method_name is not None:  
             getattr(self, method_name)(name, qname)  
87    
88      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
89          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'), None)))
     start_dispatcher['session'] = "start_session"  
90    
91      def end_session(self, name, qname):      def end_session(self, name, qname):
92          pass          pass
     end_dispatcher['session'] = "end_session"  
93    
94      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
95          """Start a map."""          """Start a map."""
96          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(attrs.get((None, 'title'), None))
     start_dispatcher['map'] = "start_map"  
97    
98      def end_map(self, name, qname):      def end_map(self, name, qname):
99          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
100      end_dispatcher['map'] = "end_map"          self.aMap = None
101    
102      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
103            self.ProjectionName = self.encode(attrs.get((None, 'name'), None))
104          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     start_dispatcher['projection'] = "start_projection"  
105    
106      def end_projection(self, name, qname):      def end_projection(self, name, qname):
107          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
108      end_dispatcher['projection'] = "end_projection"              obj = self.aLayer
109            elif self.aMap is not None:
110                obj = self.aMap
111            else:
112                assert False, "projection tag out of context"
113                pass
114    
115            obj.SetProjection(
116                Projection(self.ProjectionParams, self.ProjectionName))
117    
118      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
119          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
120          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
121          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
122    
123      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
124          """Start a layer          """Start a layer
# Line 137  class ProcessSession(xml.sax.handler.Con Line 127  class ProcessSession(xml.sax.handler.Con
127          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
128          object and bind it to self.aLayer.          object and bind it to self.aLayer.
129          """          """
130          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
131          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
132          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
133            filename = self.encode(filename)
134            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
135          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
136          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
137          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
138          self.aLayer = layer_class(title, filename, fill = fill,          self.aLayer = layer_class(title,
139                                    stroke = stroke, stroke_width = stroke_width)                                    self.theSession.OpenShapefile(filename),
140      start_dispatcher['layer'] = "start_layer"                                    fill = fill, stroke = stroke,
141                                      lineWidth = stroke_width,
142                                      visible = visible)
143    
144      def end_layer(self, name, qname):      def end_layer(self, name, qname):
145          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
146      end_dispatcher['layer'] = "end_layer"          self.aLayer = None
147    
148        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
149            title = self.encode(attrs.get((None, 'title'), ""))
150            filename = attrs.get((None, 'filename'), "")
151            filename = os.path.join(self.GetDirectory(), filename)
152            filename = self.encode(filename)
153            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
154    
155            self.aLayer = layer_class(title, filename, visible = visible)
156    
157        def end_rasterlayer(self, name, qname):
158            self.aMap.AddLayer(self.aLayer)
159            self.aLayer = None
160    
161        def start_classification(self, name, qname, attrs):
162            field = attrs.get((None, 'field'), None)
163    
164            fieldType = attrs.get((None, 'field_type'), None)
165            dbFieldType = self.aLayer.GetFieldType(field)
166    
167            if fieldType != dbFieldType:
168                raise ValueError(_("xml field type differs from database!"))
169    
170            # setup conversion routines depending on the kind of data
171            # we will be seeing later on
172            if fieldType == FIELDTYPE_STRING:
173                self.conv = str
174            elif fieldType == FIELDTYPE_INT:
175                self.conv = lambda p: int(float(p))
176            elif fieldType == FIELDTYPE_DOUBLE:
177                self.conv = float
178    
179            self.aLayer.GetClassification().SetField(field)
180    
181        def end_classification(self, name, qname):
182            pass
183    
184        def start_clnull(self, name, qname, attrs):
185            self.cl_group = ClassGroupDefault()
186            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
187            self.cl_prop = ClassGroupProperties()
188    
189        def end_clnull(self, name, qname):
190            self.cl_group.SetProperties(self.cl_prop)
191            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
192            del self.cl_group, self.cl_prop
193    
194        def start_clpoint(self, name, qname, attrs):
195            attrib_value = attrs.get((None, 'value'), "0")
196    
197            value = self.conv(attrib_value)
198    
199            self.cl_group = ClassGroupSingleton(value)
200            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
201            self.cl_prop = ClassGroupProperties()
202    
203    
204        def end_clpoint(self, name, qname):
205            self.cl_group.SetProperties(self.cl_prop)
206            self.aLayer.GetClassification().AppendGroup(self.cl_group)
207            del self.cl_group, self.cl_prop
208    
209        def start_clrange(self, name, qname, attrs):
210    
211            range = attrs.get((None, 'range'), None)
212            # for backward compatibility (min/max are not saved)
213            min   = attrs.get((None, 'min'), None)
214            max   = attrs.get((None, 'max'), None)
215    
216            try:
217                if range is not None:
218                    self.cl_group = ClassGroupRange(Range(range))
219                elif min is not None and max is not None:
220                    self.cl_group = ClassGroupRange(self.conv(min), self.conv(max))
221                else:
222                    self.cl_group = ClassGroupRange(Range(None))
223    
224            except ValueError:
225                raise ValueError(_("Classification range is not a number!"))
226    
227            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
228            self.cl_prop = ClassGroupProperties()
229    
230    
231        def end_clrange(self, name, qname):
232            self.cl_group.SetProperties(self.cl_prop)
233            self.aLayer.GetClassification().AppendGroup(self.cl_group)
234            del self.cl_group, self.cl_prop
235    
236        def start_cldata(self, name, qname, attrs):
237            self.cl_prop.SetLineColor(
238                parse_color(attrs.get((None, 'stroke'), "None")))
239            self.cl_prop.SetLineWidth(
240                int(attrs.get((None, 'stroke_width'), "0")))
241            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
242    
243        def end_cldata(self, name, qname):
244            pass
245    
246      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
247          print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
248      start_dispatcher['table'] = "start_table"          pass
249    
250      def end_table(self, name, qname):      def end_table(self, name, qname):
251          pass          pass
     end_dispatcher['table'] = "end_table"  
252    
253      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
254          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
255    
256      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
257          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
258          y = float(attrs[(None, 'y')])          y = float(attrs[(None, 'y')])
259          text = attrs[(None, 'text')]          text = self.encode(attrs[(None, 'text')])
260          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
261          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
262          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
     start_dispatcher['label'] = "start_label"  
263    
264      def characters(self, chars):      def characters(self, chars):
265          pass          pass
# Line 178  class ProcessSession(xml.sax.handler.Con Line 267  class ProcessSession(xml.sax.handler.Con
267    
268  def load_session(filename):  def load_session(filename):
269      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
270      dir = os.path.dirname(filename)  
271      file = open(filename)      handler = SessionLoader()
272      handler = ProcessSession(dir)      handler.read(filename)
   
     parser = make_parser()  
     parser.setContentHandler(handler)  
     parser.setErrorHandler(ErrorHandler())  
     parser.setFeature(xml.sax.handler.feature_namespaces, 1)  
     parser.parse(file)  
273    
274      session = handler.theSession      session = handler.theSession
275      # Newly loaded session aren't modified      # Newly loaded session aren't modified
Legend:
Removed from v.267  
changed lines
  Added in v.1159
[email protected]
 ViewVC Help
Powered by ViewVC 1.1.26