/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 920 by bh, Fri May 16 17:37:29 2003 UTC revision 2104 by bh, Fri Mar 12 12:19:15 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
4  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
# 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  
17    
18  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
19    
20    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 38  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):  
         """Return an XML-escaped and UTF-8 encoded copy of the string str.  
   
         Assume that the argument is a bytestring in Latin 1.  
         """  
         return unicode(escape(str),'latin1').encode("utf8")  
88    
89    
90  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
# Line 162  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-1.1.dtd")
135          self.write_session(self.session)          self.write_session(self.session)
136          self.close()          self.close()
137    
# Line 191  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-1.1-dev.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                                        "id_column": container.IDColumn().name,
216                                        "geometry_column":
217                                          container.GeometryColumn().name,
218                                        })
219                elif isinstance(container, DBFTable):
220                    filename = self.prepare_filename(container.FileName())
221                    self.write_element("filetable",
222                                       {"id": idvalue,
223                                        "title": container.Title(),
224                                        "filename": filename,
225                                        "filetype": "DBF"})
226                elif isinstance(container, TransientJoinedTable):
227                    left, right = container.Dependencies()
228                    left_field = container.left_field
229                    right_field = container.right_field
230                    self.write_element("jointable",
231                                       {"id": idvalue,
232                                        "title": container.Title(),
233                                        "right": self.get_id(right),
234                                        "rightcolumn": right_field,
235                                        "left": self.get_id(left),
236                                        "leftcolumn": left_field,
237                                        "jointype": container.JoinType()})
238                else:
239                    raise ValueError("Can't handle container %r" % container)
240    
241    
242      def write_map(self, map):      def write_map(self, map):
243          """Write the map and its contents.          """Write the map and its contents.
244    
# Line 215  class SessionSaver(XMLWriter): Line 258  class SessionSaver(XMLWriter):
258          """Write the projection.          """Write the projection.
259          """          """
260          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
261              self.open_element("projection", {"name": projection.GetName()})              attrs = {"name": projection.GetName()}
262                epsg = projection.EPSGCode()
263                if epsg is not None:
264                    attrs["epsg"] = epsg
265                self.open_element("projection", attrs)
266              for param in projection.params:              for param in projection.params:
267                  self.write_element('parameter value="%s"' %                  self.write_element('parameter value="%s"' %
268                                     self.encode(param))                                     self.encode(param))
# Line 228  class SessionSaver(XMLWriter): Line 275  class SessionSaver(XMLWriter):
275          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
276          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
277          """          """
         lc = layer.GetClassification()  
278    
279          if attrs is None:          if attrs is None:
280              attrs = {}              attrs = {}
281    
282          attrs["title"]        = layer.title          attrs["title"]   = layer.title
283          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)  
284    
285          self.write_classification(layer)          if isinstance(layer, Layer):
286                attrs["shapestore"]   = self.get_id(layer.ShapeStore())
287    
288          self.close_element("layer")              lc = layer.GetClassification()
289                attrs["stroke"] = lc.GetDefaultLineColor().hex()
290                attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
291                attrs["fill"] = lc.GetDefaultFill().hex()
292    
293                self.open_element("layer", attrs)
294                self.write_projection(layer.GetProjection())
295                self.write_classification(layer)
296                self.close_element("layer")
297            elif isinstance(layer, RasterLayer):
298                attrs["filename"] = self.prepare_filename(layer.filename)
299                self.open_element("rasterlayer", attrs)
300                self.write_projection(layer.GetProjection())
301                self.close_element("rasterlayer")
302    
303      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
304            """Write Classification information."""
305    
306          if attrs is None:          if attrs is None:
307              attrs = {}              attrs = {}
308    
309          lc = layer.GetClassification()          lc = layer.GetClassification()
310    
311          field = lc.GetField()          field = layer.GetClassificationColumn()
312    
313          #          #
314          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
315          #          #
316          if field is None: return          if field is None: return
317    
318          attrs["field"] = field          attrs["field"] = field
319          attrs["field_type"] = str(lc.GetFieldType())          attrs["field_type"] = str(layer.GetFieldType(field))
320          self.open_element("classification", attrs)          self.open_element("classification", attrs)
321    
322            for g in lc:
323          types = [[lambda p: 'clnull label="%s"' % self.encode(p.GetLabel()),              if isinstance(g, ClassGroupDefault):
324                    lambda p: 'clnull'],                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
325                   [lambda p: 'clpoint label="%s" value="%s"' %                  close_el = 'clnull'
326                               (self.encode(p.GetLabel()), str(p.GetValue())),              elif isinstance(g, ClassGroupSingleton):
327                    lambda p: 'clpoint'],                  if layer.GetFieldType(field) == FIELDTYPE_STRING:
328                   [lambda p: 'clrange label="%s" range="%s"' %                      value = self.encode(g.GetValue())
329                               (self.encode(p.GetLabel()),                  else:
330                                str(p.GetRange())),                      value = str(g.GetValue())
331                    lambda p: 'clrange']]                  open_el  = 'clpoint label="%s" value="%s"' \
332                               % (self.encode(g.GetLabel()), value)
333          def write_class_group(group):                  close_el = 'clpoint'
334              type = -1              elif isinstance(g, ClassGroupRange):
335              if isinstance(group, ClassGroupDefault): type = 0                  open_el  = 'clrange label="%s" range="%s"' \
336              elif isinstance(group, ClassGroupSingleton): type = 1                            % (self.encode(g.GetLabel()), str(g.GetRange()))
337              elif isinstance(group, ClassGroupRange): type = 2                  close_el = 'clrange'
338              elif isinstance(group, ClassGroupMap):   type = 3              else:
339              assert type >= 0                  assert False, _("Unsupported group type in classification")
340                    continue
341              if type <= 2:  
342                  data = group.GetProperties()              data = g.GetProperties()
343                  dict = {'stroke'      : data.GetLineColor().hex(),              dict = {'stroke'      : data.GetLineColor().hex(),
344                          'stroke_width': str(data.GetLineWidth()),                      'stroke_width': str(data.GetLineWidth()),
345                          'fill'        : data.GetFill().hex()}                      'fill'        : data.GetFill().hex()}
346    
347                  self.open_element(types[type][0](group))              self.open_element(open_el)
348                  self.write_element("cldata", dict)              self.write_element("cldata", dict)
349                  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)  
350    
351          self.close_element("classification")          self.close_element("classification")
352    
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