/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 932 by jonathan, Tue May 20 15:23:33 2003 UTC revision 1843 by bh, Tue Oct 21 10:49:38 2003 UTC
# Line 14  Functions to save a session to a file Line 14  Functions to save a session to a file
14  __version__ = "$Revision$"  __version__ = "$Revision$"
15    
16  import os  import os
 import string  
   
 from types import UnicodeType  
17    
18  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
19    
 from Thuban.Model.color import Color  
20  from Thuban.Model.layer import Layer, RasterLayer  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 = ""  
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 = {}):  
72    
         #  
         # 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")  
         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"' % (self.encode(name),  
                                           self.encode(value)))  
   
     def encode(self, str):  
         """Return an XML-escaped and UTF-8 encoded copy of the string str."""  
   
         esc = escape(str)  
   
         if isinstance(esc, UnicodeType):  
             return esc.encode("utf8")  
         else:  
             return unicode(escape(str),'latin1').encode("utf8")  
73    
74  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
75    
# Line 169  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-1.0.dtd")
110          self.write_session(self.session)          self.write_session(self.session)
111          self.close()          self.close()
112    
# Line 198  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-1.0-dev.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 222  class SessionSaver(XMLWriter): Line 229  class SessionSaver(XMLWriter):
229          """Write the projection.          """Write the projection.
230          """          """
231          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
232              self.open_element("projection", {"name": projection.GetName()})              attrs = {"name": projection.GetName()}
233                epsg = projection.EPSGCode()
234                if epsg is not None:
235                    attrs["epsg"] = epsg
236                self.open_element("projection", attrs)
237              for param in projection.params:              for param in projection.params:
238                  self.write_element('parameter value="%s"' %                  self.write_element('parameter value="%s"' %
239                                     self.encode(param))                                     self.encode(param))
# Line 239  class SessionSaver(XMLWriter): Line 250  class SessionSaver(XMLWriter):
250          if attrs is None:          if attrs is None:
251              attrs = {}              attrs = {}
252    
253          attrs["title"]        = layer.title          attrs["title"]   = layer.title
254          attrs["filename"]     = relative_filename(self.dir, layer.filename)          attrs["visible"] = ("false", "true")[int(layer.Visible())]
         attrs["visible"]      = ("false", "true")[int(layer.Visible())]  
255    
256          if isinstance(layer, Layer):          if isinstance(layer, Layer):
257                attrs["shapestore"]   = self.get_id(layer.ShapeStore())
258    
259              lc = layer.GetClassification()              lc = layer.GetClassification()
260              attrs["stroke"]       = lc.GetDefaultLineColor().hex()              attrs["stroke"] = lc.GetDefaultLineColor().hex()
261              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
262              attrs["fill"]         = lc.GetDefaultFill().hex()              attrs["fill"] = lc.GetDefaultFill().hex()
263    
264              self.open_element("layer", attrs)              self.open_element("layer", attrs)
265              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
266              self.write_classification(layer)              self.write_classification(layer)
267              self.close_element("layer")              self.close_element("layer")
   
268          elif isinstance(layer, RasterLayer):          elif isinstance(layer, RasterLayer):
269                attrs["filename"] = relative_filename(self.dir, layer.filename)
270              self.open_element("rasterlayer", attrs)              self.open_element("rasterlayer", attrs)
271              self.write_projection(layer.GetProjection())              self.write_projection(layer.GetProjection())
272              self.close_element("rasterlayer")              self.close_element("rasterlayer")
273    
274      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
275            """Write Classification information."""
276    
277          if attrs is None:          if attrs is None:
278              attrs = {}              attrs = {}
279    
280          lc = layer.GetClassification()          lc = layer.GetClassification()
281    
282          field = lc.GetField()          field = layer.GetClassificationColumn()
283    
284          #          #
285          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
286          #          #
287          if field is None: return          if field is None: return
288    
289          attrs["field"] = field          attrs["field"] = field
290          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
291          self.open_element("classification", attrs)          self.open_element("classification", attrs)
292    
293            for g in lc:
294          types = [[lambda p: 'clnull label="%s"' % self.encode(p.GetLabel()),              if isinstance(g, ClassGroupDefault):
295                    lambda p: 'clnull'],                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
296                   [lambda p: 'clpoint label="%s" value="%s"' %                  close_el = 'clnull'
297                               (self.encode(p.GetLabel()), str(p.GetValue())),              elif isinstance(g, ClassGroupSingleton):
298                    lambda p: 'clpoint'],                  if layer.GetFieldType(field) == FIELDTYPE_STRING:
299                   [lambda p: 'clrange label="%s" range="%s"' %                      value = self.encode(g.GetValue())
300                               (self.encode(p.GetLabel()),                  else:
301                                str(p.GetRange())),                      value = str(g.GetValue())
302                    lambda p: 'clrange']]                  open_el  = 'clpoint label="%s" value="%s"' \
303                               % (self.encode(g.GetLabel()), value)
304          def write_class_group(group):                  close_el = 'clpoint'
305              type = -1              elif isinstance(g, ClassGroupRange):
306              if isinstance(group, ClassGroupDefault): type = 0                  open_el  = 'clrange label="%s" range="%s"' \
307              elif isinstance(group, ClassGroupSingleton): type = 1                            % (self.encode(g.GetLabel()), str(g.GetRange()))
308              elif isinstance(group, ClassGroupRange): type = 2                  close_el = 'clrange'
309              elif isinstance(group, ClassGroupMap):   type = 3              else:
310              assert type >= 0                  assert False, _("Unsupported group type in classification")
311                    continue
312              if type <= 2:  
313                  data = group.GetProperties()              data = g.GetProperties()
314                  dict = {'stroke'      : data.GetLineColor().hex(),              dict = {'stroke'      : data.GetLineColor().hex(),
315                          'stroke_width': str(data.GetLineWidth()),                      'stroke_width': str(data.GetLineWidth()),
316                          'fill'        : data.GetFill().hex()}                      'fill'        : data.GetFill().hex()}
317    
318                  self.open_element(types[type][0](group))              self.open_element(open_el)
319                  self.write_element("cldata", dict)              self.write_element("cldata", dict)
320                  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)  
321    
322          self.close_element("classification")          self.close_element("classification")
323    
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