/[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 710 by jonathan, Wed Apr 23 08:45:57 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 238  class Saver: Line 256  class Saver:
256          self.open_element("classification", attrs)          self.open_element("classification", attrs)
257    
258    
 #       self.open_element("clnull")  
 #       write_class_data(lc.GetDefaultData())  
 #       self.close_element("clnull")  
               
         # just playing now with lambdas and dictionaries  
   
259          types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),          types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),
260                    lambda p: 'clnull'],                    lambda p: 'clnull'],
261                   [lambda p: 'clpoint label="%s" value="%s"' %                   [lambda p: 'clpoint label="%s" value="%s"' %
# Line 276  class Saver: Line 288  class Saver:
288          for i in lc:          for i in lc:
289              write_class_group(i)              write_class_group(i)
290    
 #       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')  
   
291          self.close_element("classification")          self.close_element("classification")
292    
293      def write_label_layer(self, layer):      def write_label_layer(self, layer):
# Line 336  def save_session(session, file, saver_cl Line 312  def save_session(session, file, saver_cl
312    
313      The optional argument saver_class is the class to use to serialize      The optional argument saver_class is the class to use to serialize
314      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
315      Saver.      SessionSaver.
316    
317      If writing the session is successful call the session's      If writing the session is successful call the session's
318      UnsetModified method      UnsetModified method
319      """      """
320      if saver_class is None:      if saver_class is None:
321          saver_class = Saver          saver_class = SessionSaver
322      saver = saver_class(session)      saver = saver_class(session)
323      saver.write(file)      saver.write(file)
324    
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