/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 894 by frank, Mon May 12 10:46:29 2003 UTC revision 2004 by bh, Tue Dec 2 13:25:55 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 unify_filename(filename):
45      """Abstract XMLWriter.      """Return a 'unified' version of filename
46    
47      Should be overridden to provide specific object saving functionality.      The .thuban files should be as platform independent as possible.
48        Since they must contain filenames the filenames have to unified. We
49        unify on unix-like filenames for now, which means we do nothing on a
50        posix system and simply replace backslashes with slashes on windows
51      """      """
52        if os.name == "posix":
53            return filename
54        elif os.name == "nt":
55            return "/".join(filename.split("\\"))
56        else:
57            raise RuntimeError("Unsupported platform for unify_filename: %s"
58                               % os.name)
59    
60      def __init__(self):  def sort_data_stores(stores):
61          self.filename = None      """Return a topologically sorted version of the sequence of data containers
         pass  
   
     def write(self, file_or_filename):  
         """Write the session to a file.  
   
         The argument may be either a file object or a filename. If it's  
         a filename, the file will be opened for writing. Files of  
         shapefiles will be stored as filenames relative to the directory  
         the file is stored in (as given by os.path.dirname(filename)) if  
         they have a common parent directory other than the root  
         directory.  
   
         If the argument is a file object (which is determined by the  
         presence of a write method) all filenames will be absolute  
         filenames.  
         """  
   
         # 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  
62    
63          # see open_element() for an explanation      The list is sorted so that data containers that depend on other data
64          if self.element_open == 1:      containers have higher indexes than the containers they depend on.
65              self.element_open = 0      """
66              self.file.write("/>\n")      if not stores:
67            return []
68        processed = {}
69        result = []
70        todo = stores[:]
71        while todo:
72            # It doesn't really matter which if the items of todo is
73            # processed next, but if we take the first one, the order is
74            # preserved to some degree which makes writing some of the test
75            # cases easier.
76            container = todo.pop(0)
77            if id(container) in processed:
78                continue
79            deps = [dep for dep in container.Dependencies()
80                        if id(dep) not in processed]
81            if deps:
82                todo.append(container)
83                todo.extend(deps)
84          else:          else:
85              self.file.write("%s</%s>\n" % (TAB*self.indent_level, element))              result.append(container)
86                processed[id(container)] = 1
87      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  
         """  
88    
         if str is not None:  
             return unicode(escape(str),'latin1').encode("utf8")  
         else:  
             return None  
89    
90  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
91    
# Line 170  class SessionSaver(XMLWriter): Line 103  class SessionSaver(XMLWriter):
103      def __init__(self, session):      def __init__(self, session):
104          XMLWriter.__init__(self)          XMLWriter.__init__(self)
105          self.session = session          self.session = session
106            # Map object ids to the ids used in the thuban files
107            self.idmap = {}
108    
109        def get_id(self, obj):
110            """Return the id used in the thuban file for the object obj"""
111            return self.idmap.get(id(obj))
112    
113        def define_id(self, obj, value = None):
114            if value is None:
115                value = "D" + str(id(obj))
116            self.idmap[id(obj)] = value
117            return value
118    
119        def has_id(self, obj):
120            return self.idmap.has_key(id(obj))
121    
122        def prepare_filename(self, filename):
123            """Return the string to use when writing filename to the thuban file
124    
125            The returned string is a unified version (only slashes as
126            directory separators, see unify_filename) of filename expressed
127            relative to the directory the .thuban file is written to.
128            """
129            return unify_filename(relative_filename(self.dir, filename))
130    
131      def write(self, file_or_filename):      def write(self, file_or_filename):
132          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
133    
134          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-1.0.dtd")
135          self.write_session(self.session)          self.write_session(self.session)
136          self.close()          self.close()
137    
# Line 199  class SessionSaver(XMLWriter): Line 156  class SessionSaver(XMLWriter):
156          attrs["title"] = session.title          attrs["title"] = session.title
157          for name, uri in namespaces:          for name, uri in namespaces:
158              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
159            # default name space
160            attrs["xmlns"] = \
161                   "http://thuban.intevation.org/dtds/thuban-1.0rc1.dtd"
162          self.open_element("session", attrs)          self.open_element("session", attrs)
163            self.write_db_connections(session)
164            self.write_data_containers(session)
165          for map in session.Maps():          for map in session.Maps():
166              self.write_map(map)              self.write_map(map)
167          self.close_element("session")          self.close_element("session")
168    
169        def write_db_connections(self, session):
170            for conn in session.DBConnections():
171                if isinstance(conn, PostGISConnection):
172                    self.write_element("dbconnection",
173                                       {"id": self.define_id(conn),
174                                        "dbtype": "postgis",
175                                        "host": conn.host,
176                                        "port": conn.port,
177                                        "user": conn.user,
178                                        "dbname": conn.dbname})
179                else:
180                    raise ValueError("Can't handle db connection %r" % conn)
181    
182        def write_data_containers(self, session):
183            containers = sort_data_stores(session.DataContainers())
184            for container in containers:
185                if isinstance(container, AutoTransientTable):
186                    # AutoTransientTable instances are invisible in the
187                    # thuban files. They're only used internally. To make
188                    # sure that containers depending on AutoTransientTable
189                    # instances refer to the right real containers we give
190                    # the AutoTransientTable instances the same id as the
191                    # source they depend on.
192                    self.define_id(container,
193                                   self.get_id(container.Dependencies()[0]))
194                    continue
195    
196                idvalue = self.define_id(container)
197                if isinstance(container, ShapefileStore):
198                    self.define_id(container.Table(), idvalue)
199                    filename = self.prepare_filename(container.FileName())
200                    self.write_element("fileshapesource",
201                                       {"id": idvalue, "filename": filename,
202                                        "filetype": "shapefile"})
203                elif isinstance(container, DerivedShapeStore):
204                    shapesource, table = container.Dependencies()
205                    self.write_element("derivedshapesource",
206                                       {"id": idvalue,
207                                        "shapesource": self.get_id(shapesource),
208                                        "table": self.get_id(table)})
209                elif isinstance(container, PostGISShapeStore):
210                    conn = container.DBConnection()
211                    self.write_element("dbshapesource",
212                                       {"id": idvalue,
213                                        "dbconn": self.get_id(conn),
214                                        "tablename": container.TableName()})
215                elif isinstance(container, DBFTable):
216                    filename = self.prepare_filename(container.FileName())
217                    self.write_element("filetable",
218                                       {"id": idvalue,
219                                        "title": container.Title(),
220                                        "filename": filename,
221                                        "filetype": "DBF"})
222                elif isinstance(container, TransientJoinedTable):
223                    left, right = container.Dependencies()
224                    left_field = container.left_field
225                    right_field = container.right_field
226                    self.write_element("jointable",
227                                       {"id": idvalue,
228                                        "title": container.Title(),
229                                        "right": self.get_id(right),
230                                        "rightcolumn": right_field,
231                                        "left": self.get_id(left),
232                                        "leftcolumn": left_field,
233                                        "jointype": container.JoinType()})
234                else:
235                    raise ValueError("Can't handle container %r" % container)
236    
237    
238      def write_map(self, map):      def write_map(self, map):
239          """Write the map and its contents.          """Write the map and its contents.
240    
# Line 223  class SessionSaver(XMLWriter): Line 254  class SessionSaver(XMLWriter):
254          """Write the projection.          """Write the projection.
255          """          """
256          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
257              self.open_element("projection", {"name": projection.GetName()})              attrs = {"name": projection.GetName()}
258                epsg = projection.EPSGCode()
259                if epsg is not None:
260                    attrs["epsg"] = epsg
261                self.open_element("projection", attrs)
262              for param in projection.params:              for param in projection.params:
263                  self.write_element('parameter value="%s"' %                  self.write_element('parameter value="%s"' %
264                                     self.encode(param))                                     self.encode(param))
# Line 236  class SessionSaver(XMLWriter): Line 271  class SessionSaver(XMLWriter):
271          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
272          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
273          """          """
         lc = layer.GetClassification()  
274    
275          if attrs is None:          if attrs is None:
276              attrs = {}              attrs = {}
277    
278          attrs["title"]        = layer.title          attrs["title"]   = layer.title
279          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)  
280    
281          self.write_classification(layer)          if isinstance(layer, Layer):
282                attrs["shapestore"]   = self.get_id(layer.ShapeStore())
283    
284          self.close_element("layer")              lc = layer.GetClassification()
285                attrs["stroke"] = lc.GetDefaultLineColor().hex()
286                attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
287                attrs["fill"] = lc.GetDefaultFill().hex()
288    
289                self.open_element("layer", attrs)
290                self.write_projection(layer.GetProjection())
291                self.write_classification(layer)
292                self.close_element("layer")
293            elif isinstance(layer, RasterLayer):
294                attrs["filename"] = self.prepare_filename(layer.filename)
295                self.open_element("rasterlayer", attrs)
296                self.write_projection(layer.GetProjection())
297                self.close_element("rasterlayer")
298    
299      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
300            """Write Classification information."""
301    
302          if attrs is None:          if attrs is None:
303              attrs = {}              attrs = {}
304    
305          lc = layer.GetClassification()          lc = layer.GetClassification()
306    
307          field = lc.GetField()          field = layer.GetClassificationColumn()
308    
309          #          #
310          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
311          #          #
312          if field is None: return          if field is None: return
313    
314          attrs["field"] = field          attrs["field"] = field
315          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
316          self.open_element("classification", attrs)          self.open_element("classification", attrs)
317    
318            for g in lc:
319          types = [[lambda p: 'clnull label="%s"' % self.encode(p.GetLabel()),              if isinstance(g, ClassGroupDefault):
320                    lambda p: 'clnull'],                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
321                   [lambda p: 'clpoint label="%s" value="%s"' %                  close_el = 'clnull'
322                               (self.encode(p.GetLabel()), str(p.GetValue())),              elif isinstance(g, ClassGroupSingleton):
323                    lambda p: 'clpoint'],                  if layer.GetFieldType(field) == FIELDTYPE_STRING:
324                   [lambda p: 'clrange label="%s" range="%s"' %                      value = self.encode(g.GetValue())
325                               (self.encode(p.GetLabel()),                  else:
326                                str(p.GetRange())),                      value = str(g.GetValue())
327                    lambda p: 'clrange']]                  open_el  = 'clpoint label="%s" value="%s"' \
328                               % (self.encode(g.GetLabel()), value)
329          def write_class_group(group):                  close_el = 'clpoint'
330              type = -1              elif isinstance(g, ClassGroupRange):
331              if isinstance(group, ClassGroupDefault): type = 0                  open_el  = 'clrange label="%s" range="%s"' \
332              elif isinstance(group, ClassGroupSingleton): type = 1                            % (self.encode(g.GetLabel()), str(g.GetRange()))
333              elif isinstance(group, ClassGroupRange): type = 2                  close_el = 'clrange'
334              elif isinstance(group, ClassGroupMap):   type = 3              else:
335              assert type >= 0                  assert False, _("Unsupported group type in classification")
336                    continue
337              if type <= 2:  
338                  data = group.GetProperties()              data = g.GetProperties()
339                  dict = {'stroke'      : data.GetLineColor().hex(),              dict = {'stroke'      : data.GetLineColor().hex(),
340                          'stroke_width': str(data.GetLineWidth()),                      'stroke_width': str(data.GetLineWidth()),
341                          'fill'        : data.GetFill().hex()}                      'fill'        : data.GetFill().hex()}
342    
343                  self.open_element(types[type][0](group))              self.open_element(open_el)
344                  self.write_element("cldata", dict)              self.write_element("cldata", dict)
345                  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)  
346    
347          self.close_element("classification")          self.close_element("classification")
348    
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