/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 710 by jonathan, Wed Apr 23 08:45:57 2003 UTC revision 2688 by frank, Fri Jun 30 12:27:20 2006 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001-2005 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]> (2004-2005)
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, \
27        ClassGroupPattern, ClassGroupMap
28    from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
29    from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
30    from Thuban.Model.data import DerivedShapeStore, FileShapeStore, \
31                                  SHAPETYPE_POINT
32    
33  #  from Thuban.Model.xmlwriter import XMLWriter
34  # one level of indention  from postgisdb import PostGISConnection, PostGISShapeStore
 #  
 TAB = "    "  
35    
36  def relative_filename(dir, filename):  def relative_filename(dir, filename):
37      """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 45  def relative_filename(dir, filename):
45      else:      else:
46          return filename          return filename
47    
 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  
48    
49  class XMLWriter:  def unify_filename(filename):
50      """Abstract XMLWriter.      """Return a 'unified' version of filename
51    
52      Should be overridden to provide specific object saving functionality.      The .thuban files should be as platform independent as possible.
53        Since they must contain filenames the filenames have to unified. We
54        unify on unix-like filenames for now, which means we do nothing on a
55        posix system and simply replace backslashes with slashes on windows
56      """      """
57        if os.name == "posix":
58            return filename
59        elif os.name == "nt":
60            return "/".join(filename.split("\\"))
61        else:
62            raise RuntimeError("Unsupported platform for unify_filename: %s"
63                               % os.name)
64    
65      def __init__(self):  def sort_data_stores(stores):
66          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.  
         """  
67    
68          # keep track of how many levels of indentation to write      The list is sorted so that data containers that depend on other data
69          self.indent_level = 0      containers have higher indexes than the containers they depend on.
70          # track whether an element is currently open. see open_element().      """
71          self.element_open = 0      if not stores:
72            return []
73          if hasattr(file_or_filename, "write"):      processed = {}
74              # it's a file object      result = []
75              self.file = file_or_filename      todo = stores[:]
76              self.dir = ""      while todo:
77          else:          # It doesn't really matter which if the items of todo is
78              self.filename = file_or_filename          # processed next, but if we take the first one, the order is
79              self.dir = os.path.dirname(self.filename)          # preserved to some degree which makes writing some of the test
80              self.file = open(self.filename, 'w')          # cases easier.
81            container = todo.pop(0)
82      def close(self):          if id(container) in processed:
83          assert self.indent_level == 0              continue
84          if self.filename is not None:          deps = [dep for dep in container.Dependencies()
85              self.file.close()                      if id(dep) not in processed]
86            if deps:
87      def write_header(self, doctype, system):              todo.append(container)
88          """Write the XML header"""              todo.extend(deps)
         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")  
89          else:          else:
90              self.file.write("%s</%s>\n" % (TAB*self.indent_level, element))              result.append(container)
91                processed[id(container)] = 1
92        return result
93    
94    def bool2str(b):
95        if b: return "true"
96        else: return "false"
97    
     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)))  
       
98  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
99    
100      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 157  class SessionSaver(XMLWriter): Line 111  class SessionSaver(XMLWriter):
111      def __init__(self, session):      def __init__(self, session):
112          XMLWriter.__init__(self)          XMLWriter.__init__(self)
113          self.session = session          self.session = session
114            # Map object ids to the ids used in the thuban files
115            self.idmap = {}
116    
117        def get_id(self, obj):
118            """Return the id used in the thuban file for the object obj"""
119            return self.idmap.get(id(obj))
120    
121        def define_id(self, obj, value = None):
122            if value is None:
123                value = "D" + str(id(obj))
124            self.idmap[id(obj)] = value
125            return value
126    
127        def has_id(self, obj):
128            return self.idmap.has_key(id(obj))
129    
130        def prepare_filename(self, filename):
131            """Return the string to use when writing filename to the thuban file
132    
133            The returned string is a unified version (only slashes as
134            directory separators, see unify_filename) of filename expressed
135            relative to the directory the .thuban file is written to.
136            """
137            return unify_filename(relative_filename(self.dir, filename))
138    
139      def write(self, file_or_filename):      def write(self, file_or_filename):
140          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
141    
142          self.write_header("session", "thuban.dtd")          self.write_header("session", "thuban-1.1.dtd")
143          self.write_session(self.session)          self.write_session(self.session)
144          self.close()          self.close()
145    
# Line 186  class SessionSaver(XMLWriter): Line 164  class SessionSaver(XMLWriter):
164          attrs["title"] = session.title          attrs["title"] = session.title
165          for name, uri in namespaces:          for name, uri in namespaces:
166              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
167            # default name space
168            attrs["xmlns"] = \
169                   "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
170          self.open_element("session", attrs)          self.open_element("session", attrs)
171            self.write_db_connections(session)
172            self.write_data_containers(session)
173          for map in session.Maps():          for map in session.Maps():
174              self.write_map(map)              self.write_map(map)
175          self.close_element("session")          self.close_element("session")
176    
177        def write_db_connections(self, session):
178            for conn in session.DBConnections():
179                if isinstance(conn, PostGISConnection):
180                    self.write_element("dbconnection",
181                                       {"id": self.define_id(conn),
182                                        "dbtype": "postgis",
183                                        "host": conn.host,
184                                        "port": conn.port,
185                                        "user": conn.user,
186                                        "dbname": conn.dbname})
187                else:
188                    raise ValueError("Can't handle db connection %r" % conn)
189    
190        def write_data_containers(self, session):
191            containers = sort_data_stores(session.DataContainers())
192            for container in containers:
193                if isinstance(container, AutoTransientTable):
194                    # AutoTransientTable instances are invisible in the
195                    # thuban files. They're only used internally. To make
196                    # sure that containers depending on AutoTransientTable
197                    # instances refer to the right real containers we give
198                    # the AutoTransientTable instances the same id as the
199                    # source they depend on.
200                    self.define_id(container,
201                                   self.get_id(container.Dependencies()[0]))
202                    continue
203    
204                idvalue = self.define_id(container)
205                if isinstance(container, FileShapeStore):
206                    self.define_id(container.Table(), idvalue)
207                    filename = self.prepare_filename(container.FileName())
208                    self.write_element("fileshapesource",
209                                       {"id": idvalue, "filename": filename,
210                                        "filetype": container.FileType()})
211                elif isinstance(container, DerivedShapeStore):
212                    shapesource, table = container.Dependencies()
213                    self.write_element("derivedshapesource",
214                                       {"id": idvalue,
215                                        "shapesource": self.get_id(shapesource),
216                                        "table": self.get_id(table)})
217                elif isinstance(container, PostGISShapeStore):
218                    conn = container.DBConnection()
219                    self.write_element("dbshapesource",
220                                       {"id": idvalue,
221                                        "dbconn": self.get_id(conn),
222                                        "tablename": container.TableName(),
223                                        "id_column": container.IDColumn().name,
224                                        "geometry_column":
225                                          container.GeometryColumn().name,
226                                        })
227                elif isinstance(container, DBFTable):
228                    filename = self.prepare_filename(container.FileName())
229                    self.write_element("filetable",
230                                       {"id": idvalue,
231                                        "title": container.Title(),
232                                        "filename": filename,
233                                        "filetype": "DBF"})
234                elif isinstance(container, TransientJoinedTable):
235                    left, right = container.Dependencies()
236                    left_field = container.left_field
237                    right_field = container.right_field
238                    self.write_element("jointable",
239                                       {"id": idvalue,
240                                        "title": container.Title(),
241                                        "right": self.get_id(right),
242                                        "rightcolumn": right_field,
243                                        "left": self.get_id(left),
244                                        "leftcolumn": left_field,
245                                        "jointype": container.JoinType()})
246                else:
247                    raise ValueError("Can't handle container %r" % container)
248    
249    
250      def write_map(self, map):      def write_map(self, map):
251          """Write the map and its contents.          """Write the map and its contents.
252    
# Line 199  class SessionSaver(XMLWriter): Line 255  class SessionSaver(XMLWriter):
255          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
256          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
257          """          """
258          self.open_element('map title="%s"' % escape(map.title))          self.open_element('map title="%s"' % self.encode(map.title))
259          self.write_projection(map.projection)          self.write_projection(map.projection)
260          for layer in map.Layers():          for layer in map.Layers():
261              self.write_layer(layer)              self.write_layer(layer)
# Line 210  class SessionSaver(XMLWriter): Line 266  class SessionSaver(XMLWriter):
266          """Write the projection.          """Write the projection.
267          """          """
268          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
269              self.open_element("projection")              attrs = {"name": projection.GetName()}
270                epsg = projection.EPSGCode()
271                if epsg is not None:
272                    attrs["epsg"] = epsg
273                self.open_element("projection", attrs)
274              for param in projection.params:              for param in projection.params:
275                  self.write_element('parameter value="%s"' % escape(param))                  self.write_element('parameter value="%s"' %
276                                       self.encode(param))
277              self.close_element("projection")              self.close_element("projection")
278    
279      def write_layer(self, layer, attrs = None):      def write_layer(self, layer, attrs = None):
# Line 222  class SessionSaver(XMLWriter): Line 283  class SessionSaver(XMLWriter):
283          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
284          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
285          """          """
         lc = layer.GetClassification()  
286    
287          if attrs is None:          if attrs is None:
288              attrs = {}              attrs = {}
289    
290          attrs["title"]        = layer.title          attrs["title"]   = layer.title
291          attrs["filename"]     = relative_filename(self.dir, layer.filename)          attrs["visible"] = bool2str(layer.Visible())
292          attrs["stroke"]       = lc.GetDefaultLineColor().hex()  
293          attrs["stroke_width"] = str(lc.GetDefaultLineWidth())          if isinstance(layer, Layer):
294          attrs["fill"]         = lc.GetDefaultFill().hex()              attrs["shapestore"]   = self.get_id(layer.ShapeStore())
295                self.open_element("layer", attrs)
296          self.open_element("layer", attrs)              self.write_projection(layer.GetProjection())
297          self.write_classification(layer)              self.write_classification(layer)
298          self.close_element("layer")              self.close_element("layer")
299            elif isinstance(layer, RasterLayer):
300                attrs["filename"] = self.prepare_filename(layer.filename)
301    
302                masknames = ["none", "bit", "alpha"]
303    
304                if layer.MaskType() != layer.MASK_BIT:
305                    attrs["masktype"] = masknames[layer.MaskType()]
306    
307                if layer.Opacity() != 1:
308                    attrs["opacity"] = str(layer.Opacity())
309    
310                self.open_element("rasterlayer", attrs)
311                self.write_projection(layer.GetProjection())
312                self.close_element("rasterlayer")
313    
314      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
315            """Write Classification information."""
316    
317          if attrs is None:          if attrs is None:
318              attrs = {}              attrs = {}
319    
320          lc = layer.GetClassification()          lc = layer.GetClassification()
321    
322          field = lc.GetField()          field = layer.GetClassificationColumn()
   
         #  
         # there isn't a classification of anything  
         # so don't do anything  
         #  
         if field is None: return  
323    
324          attrs["field"] = field          if field is not None:
325          attrs["field_type"] = str(lc.GetFieldType())              attrs["field"] = field
326          self.open_element("classification", attrs)              attrs["field_type"] = str(layer.GetFieldType(field))
327    
328            self.open_element("classification", attrs)
329    
330          types = [[lambda p: 'clnull label="%s"' % p.GetLabel(),          for g in lc:
331                    lambda p: 'clnull'],              if isinstance(g, ClassGroupDefault):
332                   [lambda p: 'clpoint label="%s" value="%s"' %                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
333                               (p.GetLabel(), str(p.GetValue())),                  close_el = 'clnull'
334                    lambda p: 'clpoint'],              elif isinstance(g, ClassGroupSingleton):
335                   [lambda p: 'clrange label="%s" min="%s" max="%s"' %                  if layer.GetFieldType(field) == FIELDTYPE_STRING:
336                               (p.GetLabel(),                      value = self.encode(g.GetValue())
337                                str(p.GetMin()), (str(p.GetMax()))),                  else:
338                    lambda p: 'clrange']]                      value = str(g.GetValue())
339                    open_el  = 'clpoint label="%s" value="%s"' \
340          def write_class_group(group):                             % (self.encode(g.GetLabel()), value)
341              type = -1                  close_el = 'clpoint'
342              if isinstance(group, ClassGroupDefault): type = 0              elif isinstance(g, ClassGroupRange):
343              elif isinstance(group, ClassGroupSingleton): type = 1                  open_el  = 'clrange label="%s" range="%s"' \
344              elif isinstance(group, ClassGroupRange): type = 2                            % (self.encode(g.GetLabel()), str(g.GetRange()))
345              elif isinstance(group, ClassGroupMap):   type = 3                  close_el = 'clrange'
346              assert type >= 0              elif isinstance(g, ClassGroupPattern):
347                    open_el  = 'clpattern label="%s" pattern="%s"' \
348              if type <= 2:                            % (self.encode(g.GetLabel()), str(g.GetPattern()))
349                  data = group.GetProperties()                  close_el = 'clpattern'
350                  dict = {'stroke'      : data.GetLineColor().hex(),  
351                          'stroke_width': str(data.GetLineWidth()),              else:
352                          'fill'        : data.GetFill().hex()}                  assert False, _("Unsupported group type in classification")
353                    continue
354                  self.open_element(types[type][0](group))  
355                  self.write_element("cldata", dict)              data = g.GetProperties()
356                  self.close_element(types[type][1](group))              dict = {'stroke'      : data.GetLineColor().hex(),
357              else: pass # XXX: we need to handle maps                      'stroke_width': str(data.GetLineWidth()),
358                        'fill'        : data.GetFill().hex()}
359          for i in lc:  
360              write_class_group(i)              # only for point layers write the size attribute
361                if layer.ShapeType() == SHAPETYPE_POINT:
362                    dict['size'] =  str(data.GetSize())
363    
364                self.open_element(open_el)
365                self.write_element("cldata", dict)
366                self.close_element(close_el)
367    
368          self.close_element("classification")          self.close_element("classification")
369    
# Line 299  class SessionSaver(XMLWriter): Line 376  class SessionSaver(XMLWriter):
376              for label in labels:              for label in labels:
377                  self.write_element(('label x="%g" y="%g" text="%s"'                  self.write_element(('label x="%g" y="%g" text="%s"'
378                                      ' halign="%s" valign="%s"')                                      ' halign="%s" valign="%s"')
379                                  % (label.x, label.y, label.text, label.halign,                                  % (label.x, label.y,
380                                       self.encode(label.text),
381                                       label.halign,
382                                     label.valign))                                     label.valign))
383              self.close_element('labellayer')              self.close_element('labellayer')
384    
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