/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 754 by jonathan, Fri Apr 25 14:48:15 2003 UTC revision 1268 by bh, Fri Jun 20 16:10:12 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
 import string  
17    
18  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
19    
20  from Thuban.Model.color import Color  from Thuban.Model.color import Color
21    from Thuban.Model.layer import Layer, RasterLayer
22    
23  from Thuban.Model.classification import *  from Thuban.Model.classification import \
24        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
25    from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
26    from Thuban.Model.table import DBFTable
27    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
28    
29  #  from Thuban.Model.xmlwriter import XMLWriter
 # one level of indention  
 #  
 TAB = "    "  
30    
31  def relative_filename(dir, filename):  def relative_filename(dir, filename):
32      """Return a filename relative to dir for the absolute file name absname.      """Return a filename relative to dir for the absolute file name absname.
# Line 42  def relative_filename(dir, filename): Line 40  def relative_filename(dir, filename):
40      else:      else:
41          return filename          return filename
42    
 def escape(data):  
     """Escape &, \", ', <, and > in a string of data.  
     """  
     data = string.replace(data, "&", "&amp;")  
     data = string.replace(data, "<", "&lt;")  
     data = string.replace(data, ">", "&gt;")  
     data = string.replace(data, '"', "&quot;")  
     data = string.replace(data, "'", "&apos;")  
     return data  
43    
44  class XMLWriter:  def sort_data_stores(stores):
45      """Abstract XMLWriter.      """Return a topologically sorted version of the sequence of data containers
46    
47      Should be overridden to provide specific object saving functionality.      The list is sorted so that data containers that depend on other data
48        containers have higher indexes than the containers they depend on.
49      """      """
50        if not stores:
51      def __init__(self):          return []
52          self.filename = None      processed = {}
53          pass      result = []
54        todo = stores[:]
55      def write(self, file_or_filename):      while todo:
56          """Write the session to a file.          # It doesn't really matter which if the items of todo is
57            # processed next, but if we take the first one, the order is
58          The argument may be either a file object or a filename. If it's          # preserved to some degree which makes writing some of the test
59          a filename, the file will be opened for writing. Files of          # cases easier.
60          shapefiles will be stored as filenames relative to the directory          container = todo.pop(0)
61          the file is stored in (as given by os.path.dirname(filename)) if          if id(container) in processed:
62          they have a common parent directory other than the root              continue
63          directory.          deps = [dep for dep in container.Dependencies()
64                        if id(dep) not in processed]
65          If the argument is a file object (which is determined by the          if deps:
66          presence of a write method) all filenames will be absolute              todo.append(container)
67          filenames.              todo.extend(deps)
         """  
   
         # keep track of how many levels of indentation to write  
         self.indent_level = 0  
         # track whether an element is currently open. see open_element().  
         self.element_open = 0  
   
         if hasattr(file_or_filename, "write"):  
             # it's a file object  
             self.file = file_or_filename  
             self.dir = ""  
68          else:          else:
69              self.filename = file_or_filename              result.append(container)
70              self.dir = os.path.dirname(self.filename)              processed[id(container)] = 1
71              self.file = open(self.filename, 'w')      return result
   
     def close(self):  
         assert self.indent_level == 0  
         if self.filename is not None:  
             self.file.close()  
   
     def write_header(self, doctype, system):  
         """Write the XML header"""  
         self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n')  
         self.file.write('<!DOCTYPE %s SYSTEM "%s">\n' % (doctype, system))  
   
     def open_element(self, element, attrs = {}):  
   
         #  
         # we note when an element is opened so that if two open_element()  
         # calls are made successively we can end the currently open  
         # tag and will later write a proper close tag. otherwise,  
         # if a close_element() call is made directly after an open_element()  
         # call we will close the tag with a />  
         #  
         if self.element_open == 1:  
             self.file.write(">\n")  
   
         self.element_open = 1  
   
         # Helper function to write an element open tag with attributes  
         self.file.write("%s<%s" % (TAB*self.indent_level, element))  
         self.__write_attribs(attrs)  
72    
         self.indent_level += 1  
73    
     def close_element(self, element):  
         self.indent_level -= 1  
         assert self.indent_level >= 0  
   
         # see open_element() for an explanation  
         if self.element_open == 1:  
             self.element_open = 0  
             self.file.write("/>\n")  
         else:  
             self.file.write("%s</%s>\n" % (TAB*self.indent_level, element))  
   
     def write_element(self, element, attrs = {}):  
         """write an element that won't need a closing tag"""  
         self.open_element(element, attrs)  
         self.close_element(element)  
   
     def __write_attribs(self, attrs):  
         for name, value in attrs.items():  
             self.file.write(' %s="%s"' % (escape(name), escape(value)))  
       
74  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
75    
76      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 157  class SessionSaver(XMLWriter): Line 87  class SessionSaver(XMLWriter):
87      def __init__(self, session):      def __init__(self, session):
88          XMLWriter.__init__(self)          XMLWriter.__init__(self)
89          self.session = session          self.session = session
90            # Map object ids to the ids used in the thuban files
91            self.idmap = {}
92    
93        def get_id(self, obj):
94            """Return the id used in the thuban file for the object obj"""
95            return self.idmap.get(id(obj))
96    
97        def define_id(self, obj, value = None):
98            if value is None:
99                value = "D" + str(id(obj))
100            self.idmap[id(obj)] = value
101            return value
102    
103        def has_id(self, obj):
104            return self.idmap.has_key(id(obj))
105    
106      def write(self, file_or_filename):      def write(self, file_or_filename):
107          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
108    
109          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-0.8.dtd")
110          self.write_session(self.session)          self.write_session(self.session)
111          self.close()          self.close()
112    
# Line 186  class SessionSaver(XMLWriter): Line 131  class SessionSaver(XMLWriter):
131          attrs["title"] = session.title          attrs["title"] = session.title
132          for name, uri in namespaces:          for name, uri in namespaces:
133              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
134            # default name space
135            attrs["xmlns"] = \
136                   "http://thuban.intevation.org/dtds/thuban-0.8.dtd"
137          self.open_element("session", attrs)          self.open_element("session", attrs)
138            self.write_data_containers(session)
139          for map in session.Maps():          for map in session.Maps():
140              self.write_map(map)              self.write_map(map)
141          self.close_element("session")          self.close_element("session")
142    
143        def write_data_containers(self, session):
144            containers = sort_data_stores(session.DataContainers())
145            for container in containers:
146                if isinstance(container, AutoTransientTable):
147                    # AutoTransientTable instances are invisible in the
148                    # thuban files. They're only used internally. To make
149                    # sure that containers depending on AutoTransientTable
150                    # instances refer to the right real containers we give
151                    # the AutoTransientTable instances the same id as the
152                    # source they depend on.
153                    self.define_id(container,
154                                   self.get_id(container.Dependencies()[0]))
155                    continue
156    
157                idvalue = self.define_id(container)
158                if isinstance(container, ShapefileStore):
159                    self.define_id(container.Table(), idvalue)
160                    filename = relative_filename(self.dir, container.FileName())
161                    self.write_element("fileshapesource",
162                                       {"id": idvalue, "filename": filename,
163                                        "filetype": "shapefile"})
164                elif isinstance(container, DerivedShapeStore):
165                    shapesource, table = container.Dependencies()
166                    self.write_element("derivedshapesource",
167                                       {"id": idvalue,
168                                        "shapesource": self.get_id(shapesource),
169                                        "table": self.get_id(table)})
170                elif isinstance(container, DBFTable):
171                    filename = relative_filename(self.dir, container.FileName())
172                    self.write_element("filetable",
173                                       {"id": idvalue,
174                                        "title": container.Title(),
175                                        "filename": filename,
176                                        "filetype": "DBF"})
177                elif isinstance(container, TransientJoinedTable):
178                    left, right = container.Dependencies()
179                    left_field = container.left_field
180                    right_field = container.right_field
181                    self.write_element("jointable",
182                                       {"id": idvalue,
183                                        "title": container.Title(),
184                                        "right": self.get_id(right),
185                                        "rightcolumn": right_field,
186                                        "left": self.get_id(left),
187                                        "leftcolumn": left_field})
188                else:
189                    raise ValueError("Can't handle container %r" % container)
190    
191    
192      def write_map(self, map):      def write_map(self, map):
193          """Write the map and its contents.          """Write the map and its contents.
194    
# Line 199  class SessionSaver(XMLWriter): Line 197  class SessionSaver(XMLWriter):
197          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
198          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
199          """          """
200          self.open_element('map title="%s"' % escape(map.title))          self.open_element('map title="%s"' % self.encode(map.title))
201          self.write_projection(map.projection)          self.write_projection(map.projection)
202          for layer in map.Layers():          for layer in map.Layers():
203              self.write_layer(layer)              self.write_layer(layer)
# Line 210  class SessionSaver(XMLWriter): Line 208  class SessionSaver(XMLWriter):
208          """Write the projection.          """Write the projection.
209          """          """
210          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
211              self.open_element("projection",              self.open_element("projection", {"name": projection.GetName()})
                               {"name": escape(projection.GetName())})  
212              for param in projection.params:              for param in projection.params:
213                  self.write_element('parameter value="%s"' % escape(param))                  self.write_element('parameter value="%s"' %
214                                       self.encode(param))
215              self.close_element("projection")              self.close_element("projection")
216    
217      def write_layer(self, layer, attrs = None):      def write_layer(self, layer, attrs = None):
# Line 223  class SessionSaver(XMLWriter): Line 221  class SessionSaver(XMLWriter):
221          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
222          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
223          """          """
         lc = layer.GetClassification()  
224    
225          if attrs is None:          if attrs is None:
226              attrs = {}              attrs = {}
227    
228          attrs["title"]        = layer.title          attrs["title"]   = layer.title
229          attrs["filename"]     = relative_filename(self.dir, layer.filename)          attrs["visible"] = ("false", "true")[int(layer.Visible())]
         attrs["stroke"]       = lc.GetDefaultLineColor().hex()  
         attrs["stroke_width"] = str(lc.GetDefaultLineWidth())  
         attrs["fill"]         = lc.GetDefaultFill().hex()  
   
         self.open_element("layer", attrs)  
   
         proj = layer.GetProjection()  
         if proj is not None:  
             self.write_projection(proj)  
230    
231          self.write_classification(layer)          if isinstance(layer, Layer):
232                attrs["shapestore"]   = self.get_id(layer.ShapeStore())
233    
234          self.close_element("layer")              lc = layer.GetClassification()
235                attrs["stroke"] = lc.GetDefaultLineColor().hex()
236                attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
237                attrs["fill"] = lc.GetDefaultFill().hex()
238    
239                self.open_element("layer", attrs)
240                self.write_projection(layer.GetProjection())
241                self.write_classification(layer)
242                self.close_element("layer")
243            elif isinstance(layer, RasterLayer):
244                attrs["filename"] = relative_filename(self.dir, layer.filename)
245                self.open_element("rasterlayer", attrs)
246                self.write_projection(layer.GetProjection())
247                self.close_element("rasterlayer")
248    
249      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
250            """Write Classification information."""
251    
252          if attrs is None:          if attrs is None:
253              attrs = {}              attrs = {}
254    
# Line 253  class SessionSaver(XMLWriter): Line 257  class SessionSaver(XMLWriter):
257          field = lc.GetField()          field = lc.GetField()
258    
259          #          #
260          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
261          #          #
262          if field is None: return          if field is None: return
263    
# Line 262  class SessionSaver(XMLWriter): Line 265  class SessionSaver(XMLWriter):
265          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(lc.GetFieldType())
266          self.open_element("classification", attrs)          self.open_element("classification", attrs)
267    
268            for g in lc:
269          types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),              if isinstance(g, ClassGroupDefault):
270                    lambda p: 'clnull'],                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
271                   [lambda p: 'clpoint label="%s" value="%s"' %                  close_el = 'clnull'
272                               (p.GetLabel(), str(p.GetValue())),              elif isinstance(g, ClassGroupSingleton):
273                    lambda p: 'clpoint'],                  open_el  = 'clpoint label="%s" value="%s"' \
274                   [lambda p: 'clrange label="%s" min="%s" max="%s"' %                             % (self.encode(g.GetLabel()), str(g.GetValue()))
275                               (p.GetLabel(),                  close_el = 'clpoint'
276                                str(p.GetMin()), (str(p.GetMax()))),              elif isinstance(g, ClassGroupRange):
277                    lambda p: 'clrange']]                  open_el  = 'clrange label="%s" range="%s"' \
278                              % (self.encode(g.GetLabel()), str(g.GetRange()))
279          def write_class_group(group):                  close_el = 'clrange'
280              type = -1              else:
281              if isinstance(group, ClassGroupDefault): type = 0                  assert False, _("Unsupported group type in classification")
282              elif isinstance(group, ClassGroupSingleton): type = 1                  continue
283              elif isinstance(group, ClassGroupRange): type = 2  
284              elif isinstance(group, ClassGroupMap):   type = 3              data = g.GetProperties()
285              assert type >= 0              dict = {'stroke'      : data.GetLineColor().hex(),
286                        'stroke_width': str(data.GetLineWidth()),
287              if type <= 2:                      'fill'        : data.GetFill().hex()}
288                  data = group.GetProperties()  
289                  dict = {'stroke'      : data.GetLineColor().hex(),              self.open_element(open_el)
290                          'stroke_width': str(data.GetLineWidth()),              self.write_element("cldata", dict)
291                          'fill'        : data.GetFill().hex()}              self.close_element(close_el)
   
                 self.open_element(types[type][0](group))  
                 self.write_element("cldata", dict)  
                 self.close_element(types[type][1](group))  
             else: pass # XXX: we need to handle maps  
   
         for i in lc:  
             write_class_group(i)  
292    
293          self.close_element("classification")          self.close_element("classification")
294    
# Line 306  class SessionSaver(XMLWriter): Line 301  class SessionSaver(XMLWriter):
301              for label in labels:              for label in labels:
302                  self.write_element(('label x="%g" y="%g" text="%s"'                  self.write_element(('label x="%g" y="%g" text="%s"'
303                                      ' halign="%s" valign="%s"')                                      ' halign="%s" valign="%s"')
304                                  % (label.x, label.y, label.text, label.halign,                                  % (label.x, label.y,
305                                       self.encode(label.text),
306                                       label.halign,
307                                     label.valign))                                     label.valign))
308              self.close_element('labellayer')              self.close_element('labellayer')
309    
Legend:
Removed from v.754  
changed lines
  Added in v.1268
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