/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
ViewVC logotype

Diff of /branches/WIP-pyshapelib-bramz/Thuban/Model/save.py

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 754 by jonathan, Fri Apr 25 14:48:15 2003 UTC revision 2384 by jan, Thu Oct 7 14:24:24 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001-2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]> (2004)
4  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]> (2001-2004)
5  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]> (2003)
6    # Frank Koormann <[email protected]> (2003)
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # 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    
15  __version__ = "$Revision$"  __version__ = "$Revision$"
16    # $Source$
17  # fix for people using python2.1  # $Id$
 from __future__ import nested_scopes  
18    
19  import os  import os
 import string  
20    
21  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
22    
23  from Thuban.Model.color import Color  from Thuban.Model.layer import Layer, RasterLayer
24    
25  from Thuban.Model.classification import *  from Thuban.Model.classification import \
26        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
27    from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
28    from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
29    from Thuban.Model.data import DerivedShapeStore, ShapefileStore, \
30                                  SHAPETYPE_POINT
31    
32  #  from Thuban.Model.xmlwriter import XMLWriter
33  # one level of indention  from postgisdb import PostGISConnection, PostGISShapeStore
 #  
 TAB = "    "  
34    
35  def relative_filename(dir, filename):  def relative_filename(dir, filename):
36      """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 44  def relative_filename(dir, filename):
44      else:      else:
45          return filename          return filename
46    
 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  
47    
48  class XMLWriter:  def unify_filename(filename):
49      """Abstract XMLWriter.      """Return a 'unified' version of filename
50    
51      Should be overridden to provide specific object saving functionality.      The .thuban files should be as platform independent as possible.
52        Since they must contain filenames the filenames have to unified. We
53        unify on unix-like filenames for now, which means we do nothing on a
54        posix system and simply replace backslashes with slashes on windows
55      """      """
56        if os.name == "posix":
57            return filename
58        elif os.name == "nt":
59            return "/".join(filename.split("\\"))
60        else:
61            raise RuntimeError("Unsupported platform for unify_filename: %s"
62                               % os.name)
63    
64      def __init__(self):  def sort_data_stores(stores):
65          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.  
         """  
66    
67          # keep track of how many levels of indentation to write      The list is sorted so that data containers that depend on other data
68          self.indent_level = 0      containers have higher indexes than the containers they depend on.
69          # track whether an element is currently open. see open_element().      """
70          self.element_open = 0      if not stores:
71            return []
72          if hasattr(file_or_filename, "write"):      processed = {}
73              # it's a file object      result = []
74              self.file = file_or_filename      todo = stores[:]
75              self.dir = ""      while todo:
76            # It doesn't really matter which if the items of todo is
77            # processed next, but if we take the first one, the order is
78            # preserved to some degree which makes writing some of the test
79            # cases easier.
80            container = todo.pop(0)
81            if id(container) in processed:
82                continue
83            deps = [dep for dep in container.Dependencies()
84                        if id(dep) not in processed]
85            if deps:
86                todo.append(container)
87                todo.extend(deps)
88          else:          else:
89              self.filename = file_or_filename              result.append(container)
90              self.dir = os.path.dirname(self.filename)              processed[id(container)] = 1
91              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  
92    
         # Helper function to write an element open tag with attributes  
         self.file.write("%s<%s" % (TAB*self.indent_level, element))  
         self.__write_attribs(attrs)  
93    
         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"' % (escape(name), escape(value)))  
       
94  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
95    
96      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 157  class SessionSaver(XMLWriter): Line 107  class SessionSaver(XMLWriter):
107      def __init__(self, session):      def __init__(self, session):
108          XMLWriter.__init__(self)          XMLWriter.__init__(self)
109          self.session = session          self.session = session
110            # Map object ids to the ids used in the thuban files
111            self.idmap = {}
112    
113        def get_id(self, obj):
114            """Return the id used in the thuban file for the object obj"""
115            return self.idmap.get(id(obj))
116    
117        def define_id(self, obj, value = None):
118            if value is None:
119                value = "D" + str(id(obj))
120            self.idmap[id(obj)] = value
121            return value
122    
123        def has_id(self, obj):
124            return self.idmap.has_key(id(obj))
125    
126        def prepare_filename(self, filename):
127            """Return the string to use when writing filename to the thuban file
128    
129            The returned string is a unified version (only slashes as
130            directory separators, see unify_filename) of filename expressed
131            relative to the directory the .thuban file is written to.
132            """
133            return unify_filename(relative_filename(self.dir, filename))
134    
135      def write(self, file_or_filename):      def write(self, file_or_filename):
136          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
137    
138          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-1.1.dtd")
139          self.write_session(self.session)          self.write_session(self.session)
140          self.close()          self.close()
141    
# Line 186  class SessionSaver(XMLWriter): Line 160  class SessionSaver(XMLWriter):
160          attrs["title"] = session.title          attrs["title"] = session.title
161          for name, uri in namespaces:          for name, uri in namespaces:
162              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
163            # default name space
164            attrs["xmlns"] = \
165                   "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
166          self.open_element("session", attrs)          self.open_element("session", attrs)
167            self.write_db_connections(session)
168            self.write_data_containers(session)
169          for map in session.Maps():          for map in session.Maps():
170              self.write_map(map)              self.write_map(map)
171          self.close_element("session")          self.close_element("session")
172    
173        def write_db_connections(self, session):
174            for conn in session.DBConnections():
175                if isinstance(conn, PostGISConnection):
176                    self.write_element("dbconnection",
177                                       {"id": self.define_id(conn),
178                                        "dbtype": "postgis",
179                                        "host": conn.host,
180                                        "port": conn.port,
181                                        "user": conn.user,
182                                        "dbname": conn.dbname})
183                else:
184                    raise ValueError("Can't handle db connection %r" % conn)
185    
186        def write_data_containers(self, session):
187            containers = sort_data_stores(session.DataContainers())
188            for container in containers:
189                if isinstance(container, AutoTransientTable):
190                    # AutoTransientTable instances are invisible in the
191                    # thuban files. They're only used internally. To make
192                    # sure that containers depending on AutoTransientTable
193                    # instances refer to the right real containers we give
194                    # the AutoTransientTable instances the same id as the
195                    # source they depend on.
196                    self.define_id(container,
197                                   self.get_id(container.Dependencies()[0]))
198                    continue
199    
200                idvalue = self.define_id(container)
201                if isinstance(container, ShapefileStore):
202                    self.define_id(container.Table(), idvalue)
203                    filename = self.prepare_filename(container.FileName())
204                    self.write_element("fileshapesource",
205                                       {"id": idvalue, "filename": filename,
206                                        "filetype": "shapefile"})
207                elif isinstance(container, DerivedShapeStore):
208                    shapesource, table = container.Dependencies()
209                    self.write_element("derivedshapesource",
210                                       {"id": idvalue,
211                                        "shapesource": self.get_id(shapesource),
212                                        "table": self.get_id(table)})
213                elif isinstance(container, PostGISShapeStore):
214                    conn = container.DBConnection()
215                    self.write_element("dbshapesource",
216                                       {"id": idvalue,
217                                        "dbconn": self.get_id(conn),
218                                        "tablename": container.TableName(),
219                                        "id_column": container.IDColumn().name,
220                                        "geometry_column":
221                                          container.GeometryColumn().name,
222                                        })
223                elif isinstance(container, DBFTable):
224                    filename = self.prepare_filename(container.FileName())
225                    self.write_element("filetable",
226                                       {"id": idvalue,
227                                        "title": container.Title(),
228                                        "filename": filename,
229                                        "filetype": "DBF"})
230                elif isinstance(container, TransientJoinedTable):
231                    left, right = container.Dependencies()
232                    left_field = container.left_field
233                    right_field = container.right_field
234                    self.write_element("jointable",
235                                       {"id": idvalue,
236                                        "title": container.Title(),
237                                        "right": self.get_id(right),
238                                        "rightcolumn": right_field,
239                                        "left": self.get_id(left),
240                                        "leftcolumn": left_field,
241                                        "jointype": container.JoinType()})
242                else:
243                    raise ValueError("Can't handle container %r" % container)
244    
245    
246      def write_map(self, map):      def write_map(self, map):
247          """Write the map and its contents.          """Write the map and its contents.
248    
# Line 199  class SessionSaver(XMLWriter): Line 251  class SessionSaver(XMLWriter):
251          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
252          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
253          """          """
254          self.open_element('map title="%s"' % escape(map.title))          self.open_element('map title="%s"' % self.encode(map.title))
255          self.write_projection(map.projection)          self.write_projection(map.projection)
256          for layer in map.Layers():          for layer in map.Layers():
257              self.write_layer(layer)              self.write_layer(layer)
# Line 210  class SessionSaver(XMLWriter): Line 262  class SessionSaver(XMLWriter):
262          """Write the projection.          """Write the projection.
263          """          """
264          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
265              self.open_element("projection",              attrs = {"name": projection.GetName()}
266                                {"name": escape(projection.GetName())})              epsg = projection.EPSGCode()
267                if epsg is not None:
268                    attrs["epsg"] = epsg
269                self.open_element("projection", attrs)
270              for param in projection.params:              for param in projection.params:
271                  self.write_element('parameter value="%s"' % escape(param))                  self.write_element('parameter value="%s"' %
272                                       self.encode(param))
273              self.close_element("projection")              self.close_element("projection")
274    
275      def write_layer(self, layer, attrs = None):      def write_layer(self, layer, attrs = None):
# Line 223  class SessionSaver(XMLWriter): Line 279  class SessionSaver(XMLWriter):
279          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
280          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
281          """          """
         lc = layer.GetClassification()  
282    
283          if attrs is None:          if attrs is None:
284              attrs = {}              attrs = {}
285    
286          attrs["title"]        = layer.title          attrs["title"]   = layer.title
287          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)  
288    
289          proj = layer.GetProjection()          if isinstance(layer, Layer):
290          if proj is not None:              attrs["shapestore"]   = self.get_id(layer.ShapeStore())
             self.write_projection(proj)  
291    
292          self.write_classification(layer)              lc = layer.GetClassification()
293                attrs["stroke"] = lc.GetDefaultLineColor().hex()
294          self.close_element("layer")              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
295                attrs["fill"] = lc.GetDefaultFill().hex()
296    
297                self.open_element("layer", attrs)
298                self.write_projection(layer.GetProjection())
299                self.write_classification(layer)
300                self.close_element("layer")
301            elif isinstance(layer, RasterLayer):
302                attrs["filename"] = self.prepare_filename(layer.filename)
303                self.open_element("rasterlayer", attrs)
304                self.write_projection(layer.GetProjection())
305                self.close_element("rasterlayer")
306    
307      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
308            """Write Classification information."""
309    
310          if attrs is None:          if attrs is None:
311              attrs = {}              attrs = {}
312    
313          lc = layer.GetClassification()          lc = layer.GetClassification()
314    
315          field = lc.GetField()          field = layer.GetClassificationColumn()
316    
317          #          #
318          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
319          #          #
320          if field is None: return          if field is None: return
321    
322          attrs["field"] = field          attrs["field"] = field
323          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
324          self.open_element("classification", attrs)          self.open_element("classification", attrs)
325    
326            for g in lc:
327          types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),              if isinstance(g, ClassGroupDefault):
328                    lambda p: 'clnull'],                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
329                   [lambda p: 'clpoint label="%s" value="%s"' %                  close_el = 'clnull'
330                               (p.GetLabel(), str(p.GetValue())),              elif isinstance(g, ClassGroupSingleton):
331                    lambda p: 'clpoint'],                  if layer.GetFieldType(field) == FIELDTYPE_STRING:
332                   [lambda p: 'clrange label="%s" min="%s" max="%s"' %                      value = self.encode(g.GetValue())
333                               (p.GetLabel(),                  else:
334                                str(p.GetMin()), (str(p.GetMax()))),                      value = str(g.GetValue())
335                    lambda p: 'clrange']]                  open_el  = 'clpoint label="%s" value="%s"' \
336                               % (self.encode(g.GetLabel()), value)
337          def write_class_group(group):                  close_el = 'clpoint'
338              type = -1              elif isinstance(g, ClassGroupRange):
339              if isinstance(group, ClassGroupDefault): type = 0                  open_el  = 'clrange label="%s" range="%s"' \
340              elif isinstance(group, ClassGroupSingleton): type = 1                            % (self.encode(g.GetLabel()), str(g.GetRange()))
341              elif isinstance(group, ClassGroupRange): type = 2                  close_el = 'clrange'
342              elif isinstance(group, ClassGroupMap):   type = 3              else:
343              assert type >= 0                  assert False, _("Unsupported group type in classification")
344                    continue
345              if type <= 2:  
346                  data = group.GetProperties()              data = g.GetProperties()
347                  dict = {'stroke'      : data.GetLineColor().hex(),              dict = {'stroke'      : data.GetLineColor().hex(),
348                          'stroke_width': str(data.GetLineWidth()),                      'stroke_width': str(data.GetLineWidth()),
349                          'fill'        : data.GetFill().hex()}                      'fill'        : data.GetFill().hex()}
350    
351                  self.open_element(types[type][0](group))              # only for point layers write the size attribute
352                  self.write_element("cldata", dict)              if layer.ShapeType() == SHAPETYPE_POINT:
353                  self.close_element(types[type][1](group))                  dict['size'] =  str(data.GetSize())
354              else: pass # XXX: we need to handle maps  
355                self.open_element(open_el)
356          for i in lc:              self.write_element("cldata", dict)
357              write_class_group(i)              self.close_element(close_el)
358    
359          self.close_element("classification")          self.close_element("classification")
360    
# Line 306  class SessionSaver(XMLWriter): Line 367  class SessionSaver(XMLWriter):
367              for label in labels:              for label in labels:
368                  self.write_element(('label x="%g" y="%g" text="%s"'                  self.write_element(('label x="%g" y="%g" text="%s"'
369                                      ' halign="%s" valign="%s"')                                      ' halign="%s" valign="%s"')
370                                  % (label.x, label.y, label.text, label.halign,                                  % (label.x, label.y,
371                                       self.encode(label.text),
372                                       label.halign,
373                                     label.valign))                                     label.valign))
374              self.close_element('labellayer')              self.close_element('labellayer')
375    
Legend:
Removed from v.754  
changed lines
  Added in v.2384
[email protected]
 ViewVC Help
Powered by ViewVC 1.1.26