/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 683 by jonathan, Tue Apr 15 21:54:56 2003 UTC revision 932 by jonathan, Tue May 20 15:23:33 2003 UTC
# Line 13  Functions to save a session to a file Line 13  Functions to save a session to a file
13    
14  __version__ = "$Revision$"  __version__ = "$Revision$"
15    
 # fix for people using python2.1  
 from __future__ import nested_scopes  
   
16  import os  import os
17  import string  import string
18    
19    from types import UnicodeType
20    
21  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
22    
23  from Thuban.Model.color import Color  from Thuban.Model.color import Color
24    from Thuban.Model.layer import Layer, RasterLayer
25    
26  from Thuban.Model.classification import *  from Thuban.Model.classification import \
27        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
28    
29  #  #
30  # one level of indention  # one level of indention
# Line 52  def escape(data): Line 53  def escape(data):
53      data = string.replace(data, "'", "'")      data = string.replace(data, "'", "'")
54      return data      return data
55    
56  class Saver:  class XMLWriter:
57        """Abstract XMLWriter.
     """Class to serialize a session into an XML file.  
58    
59      Applications built on top of Thuban may derive from this class and      Should be overridden to provide specific object saving functionality.
     override or extend the methods to save additional information. This  
     additional information should take the form of additional attributes  
     or elements whose names are prefixed with a namespace. To define a  
     namespace derived classes should extend the write_session method to  
     pass the namespaces to the default implementation.  
60      """      """
61    
62        def __init__(self):
63      def __init__(self, session):          self.filename = None
64          self.session = session          pass
65    
66      def write(self, file_or_filename):      def write(self, file_or_filename):
67          """Write the session to a file.          """Write the session to a file.
# Line 79  class Saver: Line 74  class Saver:
74          directory.          directory.
75    
76          If the argument is a file object (which is determined by the          If the argument is a file object (which is determined by the
77          presence of a write method) all filenames will be absolut          presence of a write method) all filenames will be absolute
78          filenames.          filenames.
79          """          """
80    
# Line 93  class Saver: Line 88  class Saver:
88              self.file = file_or_filename              self.file = file_or_filename
89              self.dir = ""              self.dir = ""
90          else:          else:
91              filename = file_or_filename              self.filename = file_or_filename
92              self.dir = os.path.dirname(filename)              self.dir = os.path.dirname(self.filename)
93              self.file = open(filename, 'w')              self.file = open(self.filename, 'w')
         self.write_header()  
         self.write_session(self.session)  
94    
95        def close(self):
96          assert self.indent_level == 0          assert self.indent_level == 0
97            if self.filename is not None:
98                self.file.close()
99    
100        def write_header(self, doctype, system):
101            """Write the XML header"""
102            self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n')
103            self.file.write('<!DOCTYPE %s SYSTEM "%s">\n' % (doctype, system))
104    
     def write_attribs(self, attrs):  
         for name, value in attrs.items():  
             self.file.write(' %s="%s"' % (escape(name), escape(value)))  
       
105      def open_element(self, element, attrs = {}):      def open_element(self, element, attrs = {}):
106    
107          #          #
# Line 121  class Saver: Line 118  class Saver:
118    
119          # Helper function to write an element open tag with attributes          # Helper function to write an element open tag with attributes
120          self.file.write("%s<%s" % (TAB*self.indent_level, element))          self.file.write("%s<%s" % (TAB*self.indent_level, element))
121          self.write_attribs(attrs)          self.__write_attribs(attrs)
122    
123          self.indent_level += 1          self.indent_level += 1
124    
# Line 141  class Saver: Line 138  class Saver:
138          self.open_element(element, attrs)          self.open_element(element, attrs)
139          self.close_element(element)          self.close_element(element)
140    
141      def write_header(self):      def __write_attribs(self, attrs):
142          """Write the XML header"""          for name, value in attrs.items():
143          self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n')              self.file.write(' %s="%s"' % (self.encode(name),
144          self.file.write('<!DOCTYPE session SYSTEM "thuban.dtd">\n')                                            self.encode(value)))
145    
146        def encode(self, str):
147            """Return an XML-escaped and UTF-8 encoded copy of the string str."""
148    
149            esc = escape(str)
150    
151            if isinstance(esc, UnicodeType):
152                return esc.encode("utf8")
153            else:
154                return unicode(escape(str),'latin1').encode("utf8")
155    
156    class SessionSaver(XMLWriter):
157    
158        """Class to serialize a session into an XML file.
159    
160        Applications built on top of Thuban may derive from this class and
161        override or extend the methods to save additional information. This
162        additional information should take the form of additional attributes
163        or elements whose names are prefixed with a namespace. To define a
164        namespace derived classes should extend the write_session method to
165        pass the namespaces to the default implementation.
166        """
167    
168    
169        def __init__(self, session):
170            XMLWriter.__init__(self)
171            self.session = session
172    
173        def write(self, file_or_filename):
174            XMLWriter.write(self, file_or_filename)
175    
176            self.write_header("session", "thuban.dtd")
177            self.write_session(self.session)
178            self.close()
179    
180      def write_session(self, session, attrs = None, namespaces = ()):      def write_session(self, session, attrs = None, namespaces = ()):
181          """Write the session and its contents          """Write the session and its contents
# Line 180  class Saver: Line 211  class Saver:
211          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
212          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
213          """          """
214          #write = self.file.write          self.open_element('map title="%s"' % self.encode(map.title))
         self.open_element('map title="%s"' % escape(map.title))  
215          self.write_projection(map.projection)          self.write_projection(map.projection)
216          for layer in map.Layers():          for layer in map.Layers():
217              self.write_layer(layer)              self.write_layer(layer)
# Line 192  class Saver: Line 222  class Saver:
222          """Write the projection.          """Write the projection.
223          """          """
224          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
225              self.open_element("projection")              self.open_element("projection", {"name": projection.GetName()})
226              for param in projection.params:              for param in projection.params:
227                  self.write_element('parameter value="%s"' % escape(param))                  self.write_element('parameter value="%s"' %
228                                       self.encode(param))
229              self.close_element("projection")              self.close_element("projection")
230    
231      def write_layer(self, layer, attrs = None):      def write_layer(self, layer, attrs = None):
# Line 204  class Saver: Line 235  class Saver:
235          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
236          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
237          """          """
         lc = layer.GetClassification()  
238    
239          if attrs is None:          if attrs is None:
240              attrs = {}              attrs = {}
241    
242          attrs["title"]        = layer.title          attrs["title"]        = layer.title
243          attrs["filename"]     = relative_filename(self.dir, layer.filename)          attrs["filename"]     = relative_filename(self.dir, layer.filename)
244          attrs["stroke"]       = lc.GetDefaultLineColor().hex()          attrs["visible"]      = ("false", "true")[int(layer.Visible())]
245          attrs["stroke_width"] = str(lc.GetDefaultLineWidth())  
246          attrs["fill"]         = lc.GetDefaultFill().hex()          if isinstance(layer, Layer):
247    
248          self.open_element("layer", attrs)              lc = layer.GetClassification()
249          self.write_classification(layer)              attrs["stroke"]       = lc.GetDefaultLineColor().hex()
250          self.close_element("layer")              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
251                attrs["fill"]         = lc.GetDefaultFill().hex()
252    
253                self.open_element("layer", attrs)
254                self.write_projection(layer.GetProjection())
255                self.write_classification(layer)
256                self.close_element("layer")
257    
258            elif isinstance(layer, RasterLayer):
259    
260                self.open_element("rasterlayer", attrs)
261                self.write_projection(layer.GetProjection())
262                self.close_element("rasterlayer")
263    
264      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
265          if attrs is None:          if attrs is None:
# Line 238  class Saver: Line 280  class Saver:
280          self.open_element("classification", attrs)          self.open_element("classification", attrs)
281    
282    
283  #       self.open_element("clnull")          types = [[lambda p: 'clnull label="%s"' % self.encode(p.GetLabel()),
 #       write_class_data(lc.GetDefaultData())  
 #       self.close_element("clnull")  
               
         # just playing now with lambdas and dictionaries  
   
         types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),  
284                    lambda p: 'clnull'],                    lambda p: 'clnull'],
285                   [lambda p: 'clpoint label="%s" value="%s"' %                   [lambda p: 'clpoint label="%s" value="%s"' %
286                               (p.GetLabel(), str(p.GetValue())),                               (self.encode(p.GetLabel()), str(p.GetValue())),
287                    lambda p: 'clpoint'],                    lambda p: 'clpoint'],
288                   [lambda p: 'clrange label="%s" min="%s" max="%s"' %                   [lambda p: 'clrange label="%s" range="%s"' %
289                               (p.GetLabel(),                               (self.encode(p.GetLabel()),
290                                str(p.GetMin()), (str(p.GetMax()))),                                str(p.GetRange())),
291                    lambda p: 'clrange']]                    lambda p: 'clrange']]
292    
293          def write_class_group(group):          def write_class_group(group):
# Line 276  class Saver: Line 312  class Saver:
312          for i in lc:          for i in lc:
313              write_class_group(i)              write_class_group(i)
314    
 #       for i in lc:  
 #           t = i.GetType()  
 #           self.open_element(types[t][0](i))  
 #           write_class_data(i)  
 #           self.close_element(types[t][1](i))  
   
 #       for p in lc:  
 #           type = p.GetType()  
 #           if p == ClassData.DEFAULT:  
 #               lopen = lclose = 'clnull'  
 #           elif p == ClassData.POINTS:  
 #               lopen = 'clpoint value="%s"' % escape(str(p.GetValue()))  
 #               lclose = 'clpoint'  
 #           elif p == ClassData.RANGES:  
 #               lopen = 'clrange min="%s" max="%s"'  
 #                   % (escape(str(p.GetMin())), escape(str(p.GetMax()))))  
 #               lclose = 'clrange'  
   
 #           self.open_element(lopen)  
 #           write_class_data(p)  
 #           self.close_element(lclose)  
               
 #       if lc.points != {}:  
 #           for p in lc.points.values():  
 #               self.open_element('clpoint value="%s"' %  
 #                   (escape(str(p.GetValue()))))  
 #               write_class_data(p)  
 #               self.close_element('clpoint')  
 #            
 #       if lc.ranges != []:  
 #           for p in lc.ranges:  
 #               self.open_element('clrange min="%s" max="%s"'  
 #                   % (escape(str(p.GetMin())), escape(str(p.GetMax()))))  
 #               write_class_data(p)  
 #               self.close_element('clrange')  
   
315          self.close_element("classification")          self.close_element("classification")
316    
317      def write_label_layer(self, layer):      def write_label_layer(self, layer):
# Line 323  class Saver: Line 323  class Saver:
323              for label in labels:              for label in labels:
324                  self.write_element(('label x="%g" y="%g" text="%s"'                  self.write_element(('label x="%g" y="%g" text="%s"'
325                                      ' halign="%s" valign="%s"')                                      ' halign="%s" valign="%s"')
326                                  % (label.x, label.y, label.text, label.halign,                                  % (label.x, label.y,
327                                       self.encode(label.text),
328                                       label.halign,
329                                     label.valign))                                     label.valign))
330              self.close_element('labellayer')              self.close_element('labellayer')
331    
# Line 336  def save_session(session, file, saver_cl Line 338  def save_session(session, file, saver_cl
338    
339      The optional argument saver_class is the class to use to serialize      The optional argument saver_class is the class to use to serialize
340      the session. By default or if it's None, the saver class will be      the session. By default or if it's None, the saver class will be
341      Saver.      SessionSaver.
342    
343      If writing the session is successful call the session's      If writing the session is successful call the session's
344      UnsetModified method      UnsetModified method
345      """      """
346      if saver_class is None:      if saver_class is None:
347          saver_class = Saver          saver_class = SessionSaver
348      saver = saver_class(session)      saver = saver_class(session)
349      saver.write(file)      saver.write(file)
350    
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