/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 892 by frank, Mon May 12 10:45:47 2003 UTC revision 1664 by bh, Wed Aug 27 15:20:54 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.layer import Layer, RasterLayer
21    
22  from Thuban.Model.classification import \  from Thuban.Model.classification import \
23      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
24    from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
25    from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
26    from Thuban.Model.data import DerivedShapeStore, ShapefileStore
27    
28  #  from Thuban.Model.xmlwriter import XMLWriter
29  # one level of indention  from postgisdb import PostGISConnection, PostGISShapeStore
 #  
 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 43  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 = ""  
         else:  
             self.filename = file_or_filename  
             self.dir = os.path.dirname(self.filename)  
             self.file = open(self.filename, 'w')  
   
     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)  
   
         self.indent_level += 1  
   
     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")  
68          else:          else:
69              self.file.write("%s</%s>\n" % (TAB*self.indent_level, element))              result.append(container)
70                processed[id(container)] = 1
71      def write_element(self, element, attrs = {}):      return result
         """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"' % (self.encode(name),  
                                           self.encode(value)))  
       
     def encode(self, str):  
         """Assume that str is in Latin1, escape it, and encode it in UTF-8.  
           
         If str is None, return None  
         """  
72    
         if str is not None:  
             return unicode(escape(str),'latin1').encode("utf8")  
             #return escape(str).encode("utf8")  
         else:  
             return None  
73    
74  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
75    
# Line 171  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-0.9.dtd")
110          self.write_session(self.session)          self.write_session(self.session)
111          self.close()          self.close()
112    
# Line 200  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-0.9.dtd"
137          self.open_element("session", attrs)          self.open_element("session", attrs)
138            self.write_db_connections(session)
139            self.write_data_containers(session)
140          for map in session.Maps():          for map in session.Maps():
141              self.write_map(map)              self.write_map(map)
142          self.close_element("session")          self.close_element("session")
143    
144        def write_db_connections(self, session):
145            for conn in session.DBConnections():
146                if isinstance(conn, PostGISConnection):
147                    self.write_element("dbconnection",
148                                       {"id": self.define_id(conn),
149                                        "dbtype": "postgis",
150                                        "host": conn.host,
151                                        "port": conn.port,
152                                        "user": conn.user,
153                                        "dbname": conn.dbname})
154                else:
155                    raise ValueError("Can't handle db connection %r" % conn)
156    
157        def write_data_containers(self, session):
158            containers = sort_data_stores(session.DataContainers())
159            for container in containers:
160                if isinstance(container, AutoTransientTable):
161                    # AutoTransientTable instances are invisible in the
162                    # thuban files. They're only used internally. To make
163                    # sure that containers depending on AutoTransientTable
164                    # instances refer to the right real containers we give
165                    # the AutoTransientTable instances the same id as the
166                    # source they depend on.
167                    self.define_id(container,
168                                   self.get_id(container.Dependencies()[0]))
169                    continue
170    
171                idvalue = self.define_id(container)
172                if isinstance(container, ShapefileStore):
173                    self.define_id(container.Table(), idvalue)
174                    filename = relative_filename(self.dir, container.FileName())
175                    self.write_element("fileshapesource",
176                                       {"id": idvalue, "filename": filename,
177                                        "filetype": "shapefile"})
178                elif isinstance(container, DerivedShapeStore):
179                    shapesource, table = container.Dependencies()
180                    self.write_element("derivedshapesource",
181                                       {"id": idvalue,
182                                        "shapesource": self.get_id(shapesource),
183                                        "table": self.get_id(table)})
184                elif isinstance(container, PostGISShapeStore):
185                    conn = container.DBConnection()
186                    self.write_element("dbshapesource",
187                                       {"id": idvalue,
188                                        "dbconn": self.get_id(conn),
189                                        "tablename": container.TableName()})
190                elif isinstance(container, DBFTable):
191                    filename = relative_filename(self.dir, container.FileName())
192                    self.write_element("filetable",
193                                       {"id": idvalue,
194                                        "title": container.Title(),
195                                        "filename": filename,
196                                        "filetype": "DBF"})
197                elif isinstance(container, TransientJoinedTable):
198                    left, right = container.Dependencies()
199                    left_field = container.left_field
200                    right_field = container.right_field
201                    self.write_element("jointable",
202                                       {"id": idvalue,
203                                        "title": container.Title(),
204                                        "right": self.get_id(right),
205                                        "rightcolumn": right_field,
206                                        "left": self.get_id(left),
207                                        "leftcolumn": left_field,
208                                        "jointype": container.JoinType()})
209                else:
210                    raise ValueError("Can't handle container %r" % container)
211    
212    
213      def write_map(self, map):      def write_map(self, map):
214          """Write the map and its contents.          """Write the map and its contents.
215    
# Line 237  class SessionSaver(XMLWriter): Line 242  class SessionSaver(XMLWriter):
242          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
243          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
244          """          """
         lc = layer.GetClassification()  
245    
246          if attrs is None:          if attrs is None:
247              attrs = {}              attrs = {}
248    
249          attrs["title"]        = layer.title          attrs["title"]   = layer.title
250          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()  
         attrs["visible"]      = ("false", "true")[int(layer.Visible())]  
   
         self.open_element("layer", attrs)  
   
         proj = layer.GetProjection()  
         if proj is not None:  
             self.write_projection(proj)  
251    
252          self.write_classification(layer)          if isinstance(layer, Layer):
253                attrs["shapestore"]   = self.get_id(layer.ShapeStore())
254    
255          self.close_element("layer")              lc = layer.GetClassification()
256                attrs["stroke"] = lc.GetDefaultLineColor().hex()
257                attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
258                attrs["fill"] = lc.GetDefaultFill().hex()
259    
260                self.open_element("layer", attrs)
261                self.write_projection(layer.GetProjection())
262                self.write_classification(layer)
263                self.close_element("layer")
264            elif isinstance(layer, RasterLayer):
265                attrs["filename"] = relative_filename(self.dir, layer.filename)
266                self.open_element("rasterlayer", attrs)
267                self.write_projection(layer.GetProjection())
268                self.close_element("rasterlayer")
269    
270      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
271            """Write Classification information."""
272    
273          if attrs is None:          if attrs is None:
274              attrs = {}              attrs = {}
275    
276          lc = layer.GetClassification()          lc = layer.GetClassification()
277    
278          field = lc.GetField()          field = layer.GetClassificationColumn()
279    
280          #          #
281          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
282          #          #
283          if field is None: return          if field is None: return
284    
285          attrs["field"] = field          attrs["field"] = field
286          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
287          self.open_element("classification", attrs)          self.open_element("classification", attrs)
288    
289            for g in lc:
290          types = [[lambda p: 'clnull label="%s"' % self.encode(p.GetLabel()),              if isinstance(g, ClassGroupDefault):
291                    lambda p: 'clnull'],                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
292                   [lambda p: 'clpoint label="%s" value="%s"' %                  close_el = 'clnull'
293                               (self.encode(p.GetLabel()), str(p.GetValue())),              elif isinstance(g, ClassGroupSingleton):
294                    lambda p: 'clpoint'],                  if layer.GetFieldType(field) == FIELDTYPE_STRING:
295                   [lambda p: 'clrange label="%s" range="%s"' %                      value = self.encode(g.GetValue())
296                               (self.encode(p.GetLabel()),                  else:
297                                str(p.GetRange())),                      value = str(g.GetValue())
298                    lambda p: 'clrange']]                  open_el  = 'clpoint label="%s" value="%s"' \
299                               % (self.encode(g.GetLabel()), value)
300          def write_class_group(group):                  close_el = 'clpoint'
301              type = -1              elif isinstance(g, ClassGroupRange):
302              if isinstance(group, ClassGroupDefault): type = 0                  open_el  = 'clrange label="%s" range="%s"' \
303              elif isinstance(group, ClassGroupSingleton): type = 1                            % (self.encode(g.GetLabel()), str(g.GetRange()))
304              elif isinstance(group, ClassGroupRange): type = 2                  close_el = 'clrange'
305              elif isinstance(group, ClassGroupMap):   type = 3              else:
306              assert type >= 0                  assert False, _("Unsupported group type in classification")
307                    continue
308              if type <= 2:  
309                  data = group.GetProperties()              data = g.GetProperties()
310                  dict = {'stroke'      : data.GetLineColor().hex(),              dict = {'stroke'      : data.GetLineColor().hex(),
311                          'stroke_width': str(data.GetLineWidth()),                      'stroke_width': str(data.GetLineWidth()),
312                          'fill'        : data.GetFill().hex()}                      'fill'        : data.GetFill().hex()}
313    
314                  self.open_element(types[type][0](group))              self.open_element(open_el)
315                  self.write_element("cldata", dict)              self.write_element("cldata", dict)
316                  self.close_element(types[type][1](group))              self.close_element(close_el)
             else: pass # XXX: we need to handle maps  
   
         for i in lc:  
             write_class_group(i)  
317    
318          self.close_element("classification")          self.close_element("classification")
319    
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