/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 605 by jonathan, Fri Apr 4 12:16:13 2003 UTC revision 754 by jonathan, Fri Apr 25 14:48:15 2003 UTC
# Line 52  def escape(data): Line 52  def escape(data):
52      data = string.replace(data, "'", "'")      data = string.replace(data, "'", "'")
53      return data      return data
54    
55  class Saver:  class XMLWriter:
56        """Abstract XMLWriter.
57    
58      """Class to serialize a session into an XML file.      Should be overridden to provide specific object saving functionality.
   
     Applications built on top of Thuban may derive from this class and  
     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.  
59      """      """
60    
61        def __init__(self):
62      def __init__(self, session):          self.filename = None
63          self.session = session          pass
64    
65      def write(self, file_or_filename):      def write(self, file_or_filename):
66          """Write the session to a file.          """Write the session to a file.
# Line 79  class Saver: Line 73  class Saver:
73          directory.          directory.
74    
75          If the argument is a file object (which is determined by the          If the argument is a file object (which is determined by the
76          presence of a write method) all filenames will be absolut          presence of a write method) all filenames will be absolute
77          filenames.          filenames.
78          """          """
79    
# Line 93  class Saver: Line 87  class Saver:
87              self.file = file_or_filename              self.file = file_or_filename
88              self.dir = ""              self.dir = ""
89          else:          else:
90              filename = file_or_filename              self.filename = file_or_filename
91              self.dir = os.path.dirname(filename)              self.dir = os.path.dirname(self.filename)
92              self.file = open(filename, 'w')              self.file = open(self.filename, 'w')
         self.write_header()  
         self.write_session(self.session)  
93    
94        def close(self):
95          assert self.indent_level == 0          assert self.indent_level == 0
96            if self.filename is not None:
97                self.file.close()
98    
99        def write_header(self, doctype, system):
100            """Write the XML header"""
101            self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n')
102            self.file.write('<!DOCTYPE %s SYSTEM "%s">\n' % (doctype, system))
103    
     def write_attribs(self, attrs):  
         for name, value in attrs.items():  
             self.file.write(' %s="%s"' % (escape(name), escape(value)))  
       
104      def open_element(self, element, attrs = {}):      def open_element(self, element, attrs = {}):
105    
106          #          #
# Line 121  class Saver: Line 117  class Saver:
117    
118          # Helper function to write an element open tag with attributes          # Helper function to write an element open tag with attributes
119          self.file.write("%s<%s" % (TAB*self.indent_level, element))          self.file.write("%s<%s" % (TAB*self.indent_level, element))
120          self.write_attribs(attrs)          self.__write_attribs(attrs)
121    
122          self.indent_level += 1          self.indent_level += 1
123    
# Line 141  class Saver: Line 137  class Saver:
137          self.open_element(element, attrs)          self.open_element(element, attrs)
138          self.close_element(element)          self.close_element(element)
139    
140      def write_header(self):      def __write_attribs(self, attrs):
141          """Write the XML header"""          for name, value in attrs.items():
142          self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n')              self.file.write(' %s="%s"' % (escape(name), escape(value)))
143          self.file.write('<!DOCTYPE session SYSTEM "thuban.dtd">\n')      
144    class SessionSaver(XMLWriter):
145    
146        """Class to serialize a session into an XML file.
147    
148        Applications built on top of Thuban may derive from this class and
149        override or extend the methods to save additional information. This
150        additional information should take the form of additional attributes
151        or elements whose names are prefixed with a namespace. To define a
152        namespace derived classes should extend the write_session method to
153        pass the namespaces to the default implementation.
154        """
155    
156    
157        def __init__(self, session):
158            XMLWriter.__init__(self)
159            self.session = session
160    
161        def write(self, file_or_filename):
162            XMLWriter.write(self, file_or_filename)
163    
164            self.write_header("session", "thuban.dtd")
165            self.write_session(self.session)
166            self.close()
167    
168      def write_session(self, session, attrs = None, namespaces = ()):      def write_session(self, session, attrs = None, namespaces = ()):
169          """Write the session and its contents          """Write the session and its contents
# Line 180  class Saver: Line 199  class Saver:
199          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
200          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
201          """          """
         #write = self.file.write  
202          self.open_element('map title="%s"' % escape(map.title))          self.open_element('map title="%s"' % escape(map.title))
203          self.write_projection(map.projection)          self.write_projection(map.projection)
204          for layer in map.Layers():          for layer in map.Layers():
# Line 192  class Saver: Line 210  class Saver:
210          """Write the projection.          """Write the projection.
211          """          """
212          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
213              self.open_element("projection")              self.open_element("projection",
214                                  {"name": escape(projection.GetName())})
215              for param in projection.params:              for param in projection.params:
216                  self.write_element('parameter value="%s"' % escape(param))                  self.write_element('parameter value="%s"' % escape(param))
217              self.close_element("projection")              self.close_element("projection")
# Line 216  class Saver: Line 235  class Saver:
235          attrs["fill"]         = lc.GetDefaultFill().hex()          attrs["fill"]         = lc.GetDefaultFill().hex()
236    
237          self.open_element("layer", attrs)          self.open_element("layer", attrs)
238    
239            proj = layer.GetProjection()
240            if proj is not None:
241                self.write_projection(proj)
242    
243          self.write_classification(layer)          self.write_classification(layer)
244    
245          self.close_element("layer")          self.close_element("layer")
246    
247      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
# Line 238  class Saver: Line 263  class Saver:
263          self.open_element("classification", attrs)          self.open_element("classification", attrs)
264    
265    
266  #       self.open_element("clnull")          types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),
 #       write_class_data(lc.GetDefaultData())  
 #       self.close_element("clnull")  
               
         # just playing now with lambdas and dictionaries  
   
         types = [[lambda p: 'clnull',  
267                    lambda p: 'clnull'],                    lambda p: 'clnull'],
268                   [lambda p: 'clpoint value="%s"' %                   [lambda p: 'clpoint label="%s" value="%s"' %
269                               str(p.GetValue()),                               (p.GetLabel(), str(p.GetValue())),
270                    lambda p: 'clpoint'],                    lambda p: 'clpoint'],
271                   [lambda p: 'clrange min="%s" max="%s"' %                   [lambda p: 'clrange label="%s" min="%s" max="%s"' %
272                               (str(p.GetMin()),                               (p.GetLabel(),
273                                (str(p.GetMax()))),                                str(p.GetMin()), (str(p.GetMax()))),
274                    lambda p: 'clrange']]                    lambda p: 'clrange']]
275    
276          def write_class_group(group):          def write_class_group(group):
# Line 276  class Saver: Line 295  class Saver:
295          for i in lc:          for i in lc:
296              write_class_group(i)              write_class_group(i)
297    
 #       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')  
   
298          self.close_element("classification")          self.close_element("classification")
299    
300      def write_label_layer(self, layer):      def write_label_layer(self, layer):
# Line 336  def save_session(session, file, saver_cl Line 319  def save_session(session, file, saver_cl
319    
320      The optional argument saver_class is the class to use to serialize      The optional argument saver_class is the class to use to serialize
321      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
322      Saver.      SessionSaver.
323    
324      If writing the session is successful call the session's      If writing the session is successful call the session's
325      UnsetModified method      UnsetModified method
326      """      """
327      if saver_class is None:      if saver_class is None:
328          saver_class = Saver          saver_class = SessionSaver
329      saver = saver_class(session)      saver = saver_class(session)
330      saver.write(file)      saver.write(file)
331    
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