/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 366 by jonathan, Mon Jan 27 11:48:17 2003 UTC revision 740 by jonathan, Fri Apr 25 09:14:04 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 Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 12  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    
16    # fix for people using python2.1
17    from __future__ import nested_scopes
18    
19  import os  import os
20  import string  import string
21    
# Line 19  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 *
27    
28  #  #
29  # one level of indention  # one level of indention
30  #  #
# Line 46  def escape(data): Line 52  def escape(data):
52      data = string.replace(data, "'", "&apos;")      data = string.replace(data, "'", "&apos;")
53      return data      return data
54    
55  class Saver:  class XMLWriter:
56        """Abstract XMLWriter.
     """Class to serialize a session into an XML file.  
57    
58      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 additinal 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 73  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    
80          self.indent_level = 0          # keep track of how many levels of indentation to write
81            self.indent_level = 0
82            # track whether an element is currently open. see open_element().
83            self.element_open = 0
84    
85          if hasattr(file_or_filename, "write"):          if hasattr(file_or_filename, "write"):
86              # it's a file object              # it's a file object
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')
93          self.write_header()  
94          self.write_session(self.session)      def close(self):
95            assert self.indent_level == 0
96            if self.filename is not None:
97                self.file.close()
98    
99          if self.indent_level != 0:      def write_header(self, doctype, system):
100              raise ValueError("indent_level still positive!")          """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():  
             if isinstance(value, Color):  
                 value = value.hex()  
             else:  
                 value = str(value)  
             self.file.write(' %s="%s"' % (escape(name), escape(value)))  
       
104      def open_element(self, element, attrs = {}):      def open_element(self, element, attrs = {}):
105    
106            #
107            # we note when an element is opened so that if two open_element()
108            # calls are made successively we can end the currently open
109            # tag and will later write a proper close tag. otherwise,
110            # if a close_element() call is made directly after an open_element()
111            # call we will close the tag with a />
112            #
113            if self.element_open == 1:
114                self.file.write(">\n")
115    
116            self.element_open = 1
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)
         self.file.write(">\n")  
121    
122          self.indent_level += 1          self.indent_level += 1
123    
124      def close_element(self, element):      def close_element(self, element):
125          self.indent_level -= 1          self.indent_level -= 1
126          if self.indent_level < 0:          assert self.indent_level >= 0
127              raise ValueError("close_element called too many times!")  
128          self.file.write("%s</%s>\n" % (TAB*self.indent_level, element))          # see open_element() for an explanation
129            if self.element_open == 1:
130                self.element_open = 0
131                self.file.write("/>\n")
132            else:
133                self.file.write("%s</%s>\n" % (TAB*self.indent_level, element))
134    
135      def write_element(self, element, attrs = {}):      def write_element(self, element, attrs = {}):
136          # Helper function to write an element open tag with attributes          """write an element that won't need a closing tag"""
137          self.file.write("%s<%s" % (TAB*self.indent_level, element))          self.open_element(element, attrs)
138          self.write_attribs(attrs)          self.close_element(element)
         self.file.write("/>\n")  
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 160  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 184  class Saver: Line 222  class Saver:
222          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
223          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
224          """          """
225            lc = layer.GetClassification()
226    
227          if attrs is None:          if attrs is None:
228              attrs = {}              attrs = {}
229          attrs["title"] = layer.title  
230          attrs["filename"] = relative_filename(self.dir, layer.filename)          attrs["title"]        = layer.title
231          attrs["stroke_width"] = str(layer.stroke_width)          attrs["filename"]     = relative_filename(self.dir, layer.filename)
232          fill = layer.fill          attrs["stroke"]       = lc.GetDefaultLineColor().hex()
233          if fill is None:          attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
234              attrs["fill"] = "None"          attrs["fill"]         = lc.GetDefaultFill().hex()
         else:  
             attrs["fill"] = fill.hex()  
         stroke = layer.stroke  
         if stroke is None:  
             attrs["stroke"] = "None"  
         else:  
             attrs["stroke"] = stroke.hex()  
235    
236          self.open_element("layer", attrs)          self.open_element("layer", attrs)
237    
238            proj = layer.GetProjection()
239            if proj is not None:
240                self.write_projection(proj)
241    
242          self.write_classification(layer)          self.write_classification(layer)
243    
244          self.close_element("layer")          self.close_element("layer")
245    
246      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
247          if attrs is None:          if attrs is None:
248              attrs = {}              attrs = {}
249    
250          lc = layer.classification          lc = layer.GetClassification()
251    
252          field = lc.field          field = lc.GetField()
253    
254          #          #
255          # there isn't a classification of anything          # there isn't a classification of anything
# Line 219  class Saver: Line 258  class Saver:
258          if field is None: return          if field is None: return
259    
260          attrs["field"] = field          attrs["field"] = field
261            attrs["field_type"] = str(lc.GetFieldType())
262          self.open_element("classification", attrs)          self.open_element("classification", attrs)
263    
264          if lc.NullData is not None:  
265              self.open_element("clnull")          types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),
266              self.write_element("cldata", lc.NullData)                    lambda p: 'clnull'],
267              self.close_element("clnull")                   [lambda p: 'clpoint label="%s" value="%s"' %
268                                 (p.GetLabel(), str(p.GetValue())),
269          if lc.points != {}:                    lambda p: 'clpoint'],
270              for value, data in lc.points.items():                   [lambda p: 'clrange label="%s" min="%s" max="%s"' %
271                  self.open_element('clpoint value="%s"' % (escape(str(value))))                               (p.GetLabel(),
272                  self.write_element("cldata", data)                                str(p.GetMin()), (str(p.GetMax()))),
273                  self.close_element('clpoint')                    lambda p: 'clrange']]
274              
275          if lc.ranges != []:          def write_class_group(group):
276              for p in lc.ranges:              type = -1
277                  self.open_element('clrange min="%s" max="%s"'              if isinstance(group, ClassGroupDefault): type = 0
278                      % (escape(str(p[0])), escape(str(p[1]))))              elif isinstance(group, ClassGroupSingleton): type = 1
279                  self.write_element("cldata", p[2])              elif isinstance(group, ClassGroupRange): type = 2
280                  self.close_element('clrange')              elif isinstance(group, ClassGroupMap):   type = 3
281                assert type >= 0
282    
283                if type <= 2:
284                    data = group.GetProperties()
285                    dict = {'stroke'      : data.GetLineColor().hex(),
286                            'stroke_width': str(data.GetLineWidth()),
287                            'fill'        : data.GetFill().hex()}
288    
289                    self.open_element(types[type][0](group))
290                    self.write_element("cldata", dict)
291                    self.close_element(types[type][1](group))
292                else: pass # XXX: we need to handle maps
293    
294            for i in lc:
295                write_class_group(i)
296    
297          self.close_element("classification")          self.close_element("classification")
298    
# Line 263  def save_session(session, file, saver_cl Line 318  def save_session(session, file, saver_cl
318    
319      The optional argument saver_class is the class to use to serialize      The optional argument saver_class is the class to use to serialize
320      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
321      Saver.      SessionSaver.
322    
323      If writing the session is successful call the session's      If writing the session is successful call the session's
324      UnsetModified method      UnsetModified method
325      """      """
326      if saver_class is None:      if saver_class is None:
327          saver_class = Saver          saver_class = SessionSaver
328      saver = saver_class(session)      saver = saver_class(session)
329      saver.write(file)      saver.write(file)
330    
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