/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 454 by bh, Tue Mar 4 11:31:47 2003 UTC revision 892 by frank, Mon May 12 10:45:47 2003 UTC
# Line 23  import Thuban.Lib.fileutil Line 23  import Thuban.Lib.fileutil
23    
24  from Thuban.Model.color import Color  from Thuban.Model.color import Color
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.
58    
59      """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.  
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')
94          self.write_header()  
95          self.write_session(self.session)      def close(self):
96            assert self.indent_level == 0
97            if self.filename is not None:
98                self.file.close()
99    
100          assert(self.indent_level == 0)      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    
125      def close_element(self, element):      def close_element(self, element):
126          self.indent_level -= 1          self.indent_level -= 1
127          assert(self.indent_level >= 0)          assert self.indent_level >= 0
128    
129          # see open_element() for an explanation          # see open_element() for an explanation
130          if self.element_open == 1:          if self.element_open == 1:
# 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            """Assume that str is in Latin1, escape it, and encode it in UTF-8.
148            
149            If str is None, return None
150            """
151    
152            if str is not None:
153                return unicode(escape(str),'latin1').encode("utf8")
154                #return escape(str).encode("utf8")
155            else:
156                return None
157    
158    class SessionSaver(XMLWriter):
159    
160        """Class to serialize a session into an XML file.
161    
162        Applications built on top of Thuban may derive from this class and
163        override or extend the methods to save additional information. This
164        additional information should take the form of additional attributes
165        or elements whose names are prefixed with a namespace. To define a
166        namespace derived classes should extend the write_session method to
167        pass the namespaces to the default implementation.
168        """
169    
170    
171        def __init__(self, session):
172            XMLWriter.__init__(self)
173            self.session = session
174    
175        def write(self, file_or_filename):
176            XMLWriter.write(self, file_or_filename)
177    
178            self.write_header("session", "thuban.dtd")
179            self.write_session(self.session)
180            self.close()
181    
182      def write_session(self, session, attrs = None, namespaces = ()):      def write_session(self, session, attrs = None, namespaces = ()):
183          """Write the session and its contents          """Write the session and its contents
# Line 180  class Saver: Line 213  class Saver:
213          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
214          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
215          """          """
216          write = self.file.write          self.open_element('map title="%s"' % self.encode(map.title))
         self.open_element('map title="%s"' % escape(map.title))  
217          self.write_projection(map.projection)          self.write_projection(map.projection)
218          for layer in map.Layers():          for layer in map.Layers():
219              self.write_layer(layer)              self.write_layer(layer)
# Line 192  class Saver: Line 224  class Saver:
224          """Write the projection.          """Write the projection.
225          """          """
226          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
227              self.open_element("projection")              self.open_element("projection", {"name": projection.GetName()})
228              for param in projection.params:              for param in projection.params:
229                  self.write_element('parameter value="%s"' % escape(param))                  self.write_element('parameter value="%s"' %
230                                       self.encode(param))
231              self.close_element("projection")              self.close_element("projection")
232    
233      def write_layer(self, layer, attrs = None):      def write_layer(self, layer, attrs = None):
# Line 211  class Saver: Line 244  class Saver:
244    
245          attrs["title"]        = layer.title          attrs["title"]        = layer.title
246          attrs["filename"]     = relative_filename(self.dir, layer.filename)          attrs["filename"]     = relative_filename(self.dir, layer.filename)
247          attrs["stroke"]       = lc.GetDefaultStroke().hex()          attrs["stroke"]       = lc.GetDefaultLineColor().hex()
248          attrs["stroke_width"] = str(lc.GetDefaultStrokeWidth())          attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
249          attrs["fill"]         = lc.GetDefaultFill().hex()          attrs["fill"]         = lc.GetDefaultFill().hex()
250            attrs["visible"]      = ("false", "true")[int(layer.Visible())]
251    
252          self.open_element("layer", attrs)          self.open_element("layer", attrs)
253    
254            proj = layer.GetProjection()
255            if proj is not None:
256                self.write_projection(proj)
257    
258          self.write_classification(layer)          self.write_classification(layer)
259    
260          self.close_element("layer")          self.close_element("layer")
261    
262      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
# Line 234  class Saver: Line 274  class Saver:
274          if field is None: return          if field is None: return
275    
276          attrs["field"] = field          attrs["field"] = field
277            attrs["field_type"] = str(lc.GetFieldType())
278          self.open_element("classification", attrs)          self.open_element("classification", attrs)
279    
280    
281  #       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',  
282                    lambda p: 'clnull'],                    lambda p: 'clnull'],
283                   [lambda p: 'clpoint value="%s"' %                   [lambda p: 'clpoint label="%s" value="%s"' %
284                               str(p.GetValue()),                               (self.encode(p.GetLabel()), str(p.GetValue())),
285                    lambda p: 'clpoint'],                    lambda p: 'clpoint'],
286                   [lambda p: 'clrange min="%s" max="%s"' %                   [lambda p: 'clrange label="%s" range="%s"' %
287                               (str(p.GetMin()),                               (self.encode(p.GetLabel()),
288                                (str(p.GetMax()))),                                str(p.GetRange())),
289                    lambda p: 'clrange']]                    lambda p: 'clrange']]
290    
291          def write_class_group(group):          def write_class_group(group):
# Line 259  class Saver: Line 294  class Saver:
294              elif isinstance(group, ClassGroupSingleton): type = 1              elif isinstance(group, ClassGroupSingleton): type = 1
295              elif isinstance(group, ClassGroupRange): type = 2              elif isinstance(group, ClassGroupRange): type = 2
296              elif isinstance(group, ClassGroupMap):   type = 3              elif isinstance(group, ClassGroupMap):   type = 3
297              assert(type >= 0)              assert type >= 0
298    
299              if type <= 2:              if type <= 2:
300                  data = group.GetProperties()                  data = group.GetProperties()
301                  dict = {'stroke'      : data.GetStroke().hex(),                  dict = {'stroke'      : data.GetLineColor().hex(),
302                          'stroke_width': str(data.GetStrokeWidth()),                          'stroke_width': str(data.GetLineWidth()),
303                          'fill'        : data.GetFill().hex()}                          'fill'        : data.GetFill().hex()}
304    
305                  self.open_element(types[type][0](group))                  self.open_element(types[type][0](group))
# Line 275  class Saver: Line 310  class Saver:
310          for i in lc:          for i in lc:
311              write_class_group(i)              write_class_group(i)
312    
 #       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')  
   
313          self.close_element("classification")          self.close_element("classification")
314    
315      def write_label_layer(self, layer):      def write_label_layer(self, layer):
# Line 322  class Saver: Line 321  class Saver:
321              for label in labels:              for label in labels:
322                  self.write_element(('label x="%g" y="%g" text="%s"'                  self.write_element(('label x="%g" y="%g" text="%s"'
323                                      ' halign="%s" valign="%s"')                                      ' halign="%s" valign="%s"')
324                                  % (label.x, label.y, label.text, label.halign,                                  % (label.x, label.y,
325                                       self.encode(label.text),
326                                       label.halign,
327                                     label.valign))                                     label.valign))
328              self.close_element('labellayer')              self.close_element('labellayer')
329    
# Line 335  def save_session(session, file, saver_cl Line 336  def save_session(session, file, saver_cl
336    
337      The optional argument saver_class is the class to use to serialize      The optional argument saver_class is the class to use to serialize
338      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
339      Saver.      SessionSaver.
340    
341      If writing the session is successful call the session's      If writing the session is successful call the session's
342      UnsetModified method      UnsetModified method
343      """      """
344      if saver_class is None:      if saver_class is None:
345          saver_class = Saver          saver_class = SessionSaver
346      saver = saver_class(session)      saver = saver_class(session)
347      saver.write(file)      saver.write(file)
348    
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