/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 267 by bh, Thu Aug 22 10:25:30 2002 UTC revision 737 by jonathan, Fri Apr 25 09:12:17 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    from Thuban.common import *
24    
25    from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
26         FIELDTYPE_STRING
27    
28  from Thuban.Model.session import Session  from Thuban.Model.session import Session
29  from Thuban.Model.map import Map  from Thuban.Model.map import Map
30  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer
31  from Thuban.Model.color import Color  from Thuban.Model.color import Color
32  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
33    from Thuban.Model.classification import Classification, \
34        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
35        ClassGroupProperties
36    
37    
38  def parse_color(color):  def parse_color(color):
# Line 33  def parse_color(color): Line 43  def parse_color(color):
43      """      """
44      color = string.strip(color)      color = string.strip(color)
45      if color == "None":      if color == "None":
46          result = None          result = Color.Transparent
47      elif color[0] == '#':      elif color[0] == '#':
48          if len(color) == 7:          if len(color) == 7:
49              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 51  def parse_color(color):
51              b = string.atoi(color[5:7], 16) / 255.0              b = string.atoi(color[5:7], 16) / 255.0
52              result = Color(r, g, b)              result = Color(r, g, b)
53          else:          else:
54              raise ValueError("Invalid hexadecimal color specification %s"              raise ValueError(_("Invalid hexadecimal color specification %s")
55                               % color)                               % color)
56      else:      else:
57          raise ValueError("Invalid color specification %s" % color)          raise ValueError(_("Invalid color specification %s") % color)
58      return result      return result
59    
60    
61  class ProcessSession(xml.sax.handler.ContentHandler):  class XMLReader(xml.sax.handler.ContentHandler):
62    
63      # Dictionary mapping element names (or (URI, element name) pairs for      # Dictionary mapping element names (or (URI, element name) pairs for
64      # documents using amespaces) to method names. The methods should      # documents using namespaces) to method names. The methods should
65      # accept the same parameters as the startElement (or startElementNS)      # accept the same parameters as the startElement (or startElementNS)
66      # methods. The start_dispatcher is used by the default startElement      # methods. The start_dispatcher is used by the default startElement
67      # and startElementNS methods to call a method for the open tag of an      # and startElementNS methods to call a method for the open tag of an
# Line 64  class ProcessSession(xml.sax.handler.Con Line 74  class ProcessSession(xml.sax.handler.Con
74      end_dispatcher = {}      end_dispatcher = {}
75    
76    
77      def __init__(self, directory):      def __init__(self):
         """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  
78          self.chars = ''          self.chars = ''
79          self.theSession = None          self.__parser = None
80          self.aMap = None          self.__directory = ""
81          self.aLayer = None          self.__dispatchers = {}
82    
83        def read(self, file_or_filename):
84    
85            if hasattr(file_or_filename, "read"):
86                # it's a file object
87                self.__directory = ""
88                self.__file = file_or_filename
89            else:
90                filename = file_or_filename
91                self.__directory = os.path.dirname(filename)
92                self.__file = open(filename)
93    
94            if self.__parser is None:
95                self.__parser = make_parser()
96                self.__parser.setContentHandler(self)
97                self.__parser.setErrorHandler(ErrorHandler())
98                self.__parser.setFeature(xml.sax.handler.feature_namespaces, 1)
99    
100                #
101                # Well, this isn't pretty, but it appears that if you
102                # use Python 2.2 without the site-package _xmlplus then
103                # the following will fail, and without them it will work.
104                # However, if you do have the site-package and you don't
105                # call these functions, the reader raises an exception
106                #
107                # The reason we set these to 0 in the first place is
108                # because there is an unresolved issue with external
109                # entities causing an exception in the reader
110                #
111                try:
112                    self.__parser.setFeature(xml.sax.handler.feature_validation,0)
113                    self.__parser.setFeature(xml.sax.handler.feature_external_ges,0)
114                    self.__parser.setFeature(xml.sax.handler.feature_external_pes,0)
115                except SAXNotRecognizedException:
116                    pass
117    
118            self.__parser.parse(self.__file)
119    
120            self.close()
121    
122        def close(self):
123            self.__file.close()
124            
125        def GetFilename(self):
126            if hasattr(self.__file, "name"):
127                return self.__file.name
128    
129            return ""
130    
131        def GetDirectory(self):
132            return self.__directory
133    
134    
135        def AddDispatchers(self, dict):
136            """Add the function names that should be used to process XML tags.
137    
138            dict -- a dictionary whose keys are XML tag strings and whose values
139                    are pairs of strings such that the first string is
140                    the name of the function that should be called when the
141                    XML tag opens and the second string is the name of the
142                    function that should be called when the XML tag closes.
143                    If a pair element is None, no function is called.
144            """
145    
146            self.__dispatchers.update(dict)
147    
148      def startElementNS(self, name, qname, attrs):      def startElementNS(self, name, qname, attrs):
149          """Call the method given for name in self.start_dispatcher          """Call the method given for name in self.start_dispatcher
150          """          """
151          if name[0] is None:          if name[0] is None:
152              method_name = self.start_dispatcher.get(name[1])              method_name = self.__dispatchers.get(name[1])
153          else:          else:
154              # Dispatch with namespace              # Dispatch with namespace
155              method_name = self.start_dispatcher.get(name)              method_name = self.__dispatchers.get(name)
156          if method_name is not None:          if method_name is not None and method_name[0] is not None:
157              getattr(self, method_name)(name, qname, attrs)              getattr(self, method_name[0])(name, qname, attrs)
158    
159      def endElementNS(self, name, qname):      def endElementNS(self, name, qname):
160          """Call the method given for name in self.end_dispatcher          """Call the method given for name in self.end_dispatcher
161          """          """
162          if name[0] is None:          if name[0] is None:
163              method_name = self.end_dispatcher.get(name[1])              method_name = self.__dispatchers.get(name[1])
164          else:          else:
165              # Dispatch with namespace              # Dispatch with namespace
166              method_name = self.end_dispatcher.get(name)              method_name = self.__dispatchers.get(name)
167          if method_name is not None:          if method_name is not None and method_name[1] is not None:
168              getattr(self, method_name)(name, qname)              getattr(self, method_name[1])(name, qname)
169    
170    class SessionLoader(XMLReader):
171    
172        def __init__(self):
173            """Inititialize the Sax handler."""
174            XMLReader.__init__(self)
175    
176            self.theSession = None
177            self.aMap = None
178            self.aLayer = None
179    
180            XMLReader.AddDispatchers(self,
181                {'session'       : ("start_session",        "end_session"),
182                 'map'           : ("start_map",            "end_map"),
183                 'projection'    : ("start_projection",     "end_projection"),
184                 'parameter'     : ("start_parameter",      None),
185                 'layer'         : ("start_layer",          "end_layer"),
186                 'classification': ("start_classification", "end_classification"),
187                 'clnull'        : ("start_clnull",         "end_clnull"),
188                 'clpoint'       : ("start_clpoint",        "end_clpoint"),
189                 'clrange'       : ("start_clrange",        "end_clrange"),
190                 'cldata'        : ("start_cldata",         "end_cldata"),
191                 'table'         : ("start_table",          "end_table"),
192                 'labellayer'    : ("start_labellayer",     None),
193                 'label'         : ("start_label",          None)})
194    
195      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
196          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(attrs.get((None, 'title'), None))
     start_dispatcher['session'] = "start_session"  
197    
198      def end_session(self, name, qname):      def end_session(self, name, qname):
199          pass          pass
     end_dispatcher['session'] = "end_session"  
200    
201      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
202          """Start a map."""          """Start a map."""
203          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(attrs.get((None, 'title'), None))
204      start_dispatcher['map'] = "start_map"          self.__projReceiver = self.aMap
205    
206      def end_map(self, name, qname):      def end_map(self, name, qname):
207          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
208      end_dispatcher['map'] = "end_map"          self.__projReceiver = None
209    
210      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
211          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     start_dispatcher['projection'] = "start_projection"  
212    
213      def end_projection(self, name, qname):      def end_projection(self, name, qname):
214          self.aMap.SetProjection(Projection(self.ProjectionParams))          self.__projReceiver.SetProjection(Projection(self.ProjectionParams))
     end_dispatcher['projection'] = "end_projection"  
215    
216      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
217          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
218          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
219          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
220    
221      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
222          """Start a layer          """Start a layer
# Line 139  class ProcessSession(xml.sax.handler.Con Line 227  class ProcessSession(xml.sax.handler.Con
227          """          """
228          title = attrs.get((None, 'title'), "")          title = attrs.get((None, 'title'), "")
229          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
230          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
231          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
232          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
233          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
234          self.aLayer = layer_class(title, filename, fill = fill,          self.aLayer = layer_class(title,
235                                    stroke = stroke, stroke_width = stroke_width)                                    self.theSession.OpenShapefile(filename),
236      start_dispatcher['layer'] = "start_layer"                                    fill = fill, stroke = stroke,
237                                      lineWidth = stroke_width)
238    
239            self.__projReceiver = self.aLayer
240    
241      def end_layer(self, name, qname):      def end_layer(self, name, qname):
242          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
243      end_dispatcher['layer'] = "end_layer"          self.__projReceiver = None
244    
245        def start_classification(self, name, qname, attrs):
246            field = attrs.get((None, 'field'), None)
247    
248            fieldType = attrs.get((None, 'field_type'), None)
249            dbFieldType = self.aLayer.GetFieldType(field)
250    
251            if fieldType != dbFieldType:
252                raise ValueError(_("xml field type differs from database!"))
253    
254            # setup conversion routines depending on the kind of data
255            # we will be seeing later on
256            if fieldType == FIELDTYPE_STRING:
257                self.conv = str
258            elif fieldType == FIELDTYPE_INT:
259                self.conv = lambda p: int(float(p))
260            elif fieldType == FIELDTYPE_DOUBLE:
261                self.conv = float
262    
263            self.aLayer.GetClassification().SetField(field)
264    
265    
266        def end_classification(self, name, qname):
267            pass
268    
269        def start_clnull(self, name, qname, attrs):
270            self.cl_group = ClassGroupDefault()
271            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
272            self.cl_prop = ClassGroupProperties()
273    
274        def end_clnull(self, name, qname):
275            self.cl_group.SetProperties(self.cl_prop)
276            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
277            del self.cl_group, self.cl_prop
278    
279        def start_clpoint(self, name, qname, attrs):
280            attrib_value = attrs.get((None, 'value'), "0")
281    
282            #try:
283                #value  = Str2Num(attrib_value)
284            #except:
285                #value  = attrib_value
286    
287            value = self.conv(attrib_value)
288    
289            self.cl_group = ClassGroupSingleton(value)
290            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
291            self.cl_prop = ClassGroupProperties()
292    
293    
294        def end_clpoint(self, name, qname):
295            self.cl_group.SetProperties(self.cl_prop)
296            self.aLayer.GetClassification().AppendGroup(self.cl_group)
297            del self.cl_group, self.cl_prop
298    
299        def start_clrange(self, name, qname, attrs):
300    
301            try:
302                min = self.conv(attrs.get((None, 'min'), "0"))
303                max = self.conv(attrs.get((None, 'max'), "0"))
304                #min = Str2Num(attrs.get((None, 'min'), "0"))
305                #max = Str2Num(attrs.get((None, 'max'), "0"))
306            except ValueError:
307                raise ValueError(_("Classification range is not a number!"))
308    
309            self.cl_group = ClassGroupRange(min, max)
310            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
311            self.cl_prop = ClassGroupProperties()
312    
313    
314        def end_clrange(self, name, qname):
315            self.cl_group.SetProperties(self.cl_prop)
316            self.aLayer.GetClassification().AppendGroup(self.cl_group)
317            del self.cl_group, self.cl_prop
318    
319        def start_cldata(self, name, qname, attrs):
320            self.cl_prop.SetLineColor(
321                parse_color(attrs.get((None, 'stroke'), "None")))
322            self.cl_prop.SetLineWidth(
323                int(attrs.get((None, 'stroke_width'), "0")))
324            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
325    
326        def end_cldata(self, name, qname):
327            pass
328    
329      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
330          print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
331      start_dispatcher['table'] = "start_table"          pass
332    
333      def end_table(self, name, qname):      def end_table(self, name, qname):
334          pass          pass
     end_dispatcher['table'] = "end_table"  
335    
336      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
337          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
338    
339      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
340          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
# Line 170  class ProcessSession(xml.sax.handler.Con Line 343  class ProcessSession(xml.sax.handler.Con
343          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
344          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
345          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"  
346    
347      def characters(self, chars):      def characters(self, chars):
348          pass          pass
# Line 178  class ProcessSession(xml.sax.handler.Con Line 350  class ProcessSession(xml.sax.handler.Con
350    
351  def load_session(filename):  def load_session(filename):
352      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
353      dir = os.path.dirname(filename)  
354      file = open(filename)      handler = SessionLoader()
355      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)  
356    
357      session = handler.theSession      session = handler.theSession
358      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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