/[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 268 by bh, Thu Aug 22 10:25:43 2002 UTC revision 2104 by bh, Fri Mar 12 12:19:15 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 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]>
5    # Jonathan Coles <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 13  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 \
23        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    from postgisdb import PostGISConnection, PostGISShapeStore
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.
33    
# Line 29  def relative_filename(dir, filename): Line 40  def relative_filename(dir, filename):
40      else:      else:
41          return filename          return filename
42    
43  def escape(data):  
44      """Escape &, \", ', <, and > in a string of data.  def unify_filename(filename):
45        """Return a 'unified' version of filename
46    
47        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 sort_data_stores(stores):
61        """Return a topologically sorted version of the sequence of data containers
62    
63        The list is sorted so that data containers that depend on other data
64        containers have higher indexes than the containers they depend on.
65      """      """
66      data = string.replace(data, "&", "&amp;")      if not stores:
67      data = string.replace(data, "<", "&lt;")          return []
68      data = string.replace(data, ">", "&gt;")      processed = {}
69      data = string.replace(data, '"', "&quot;")      result = []
70      data = string.replace(data, "'", "&apos;")      todo = stores[:]
71      return data      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:
85                result.append(container)
86                processed[id(container)] = 1
87        return result
88    
89    
90  class Saver:  class SessionSaver(XMLWriter):
91    
92      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
93    
94      Applications built on top of Thuban may derive from this class and      Applications built on top of Thuban may derive from this class and
95      override or extend the methods to save additinal information. This      override or extend the methods to save additional information. This
96      additional information should take the form of additional attributes      additional information should take the form of additional attributes
97      or elements whose names are prefixed with a namespace. To define a      or elements whose names are prefixed with a namespace. To define a
98      namespace derived classes should extend the write_session method to      namespace derived classes should extend the write_session method to
99      pass the namespaces to the default implementation.      pass the namespaces to the default implementation.
100      """      """
101    
102    
103      def __init__(self, session):      def __init__(self, session):
104            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          """Write the session to a file.          XMLWriter.write(self, file_or_filename)
133    
134          The argument may be either a file object or a filename. If it's          self.write_header("session", "thuban-1.1.dtd")
         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 absolut  
         filenames.  
         """  
         if hasattr(file_or_filename, "write"):  
             # it's a file object  
             self.file = file_or_filename  
             self.dir = ""  
         else:  
             filename = file_or_filename  
             self.dir = os.path.dirname(filename)  
             self.file = open(filename, 'w')  
         self.write_header()  
135          self.write_session(self.session)          self.write_session(self.session)
136            self.close()
     def write_element(self, element, attrs, empty = 0, indentation = ""):  
         # Helper function to write an element open tag with attributes  
         self.file.write("%s<%s" % (indentation, element))  
         for name, value in attrs.items():  
             self.file.write(' %s="%s"' % (escape(name), escape(value)))  
         if empty:  
             self.file.write("/>\n")  
         else:  
             self.file.write(">\n")  
   
     def write_header(self):  
         """Write the XML header"""  
         write = self.file.write  
         write('<?xml version="1.0" encoding="UTF-8"?>\n')  
         write('<!DOCTYPE session SYSTEM "thuban.dtd">\n')  
137    
138      def write_session(self, session, attrs = None, namespaces = ()):      def write_session(self, session, attrs = None, namespaces = ()):
139          """Write the session and its contents          """Write the session and its contents
# Line 116  class Saver: Line 156  class Saver:
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          self.write_element("session", attrs)          # default name space
160            attrs["xmlns"] = \
161                   "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
162            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.file.write('</session>\n')          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.
# Line 129  class Saver: Line 247  class Saver:
247          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
248          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
249          """          """
250          write = self.file.write          self.open_element('map title="%s"' % self.encode(map.title))
         write('\t<map title="%s">\n' % escape(map.title))  
251          self.write_projection(map.projection)          self.write_projection(map.projection)
252          for layer in map.Layers():          for layer in map.Layers():
253              self.write_layer(layer)              self.write_layer(layer)
254          self.write_label_layer(map.LabelLayer())          self.write_label_layer(map.LabelLayer())
255          write('\t</map>\n')          self.close_element('map')
256    
257      def write_projection(self, projection):      def write_projection(self, projection):
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.file.write('\t\t<projection>\n')              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.file.write('\t\t\t<parameter value="%s"/>\n'                  self.write_element('parameter value="%s"' %
268                                  % escape(param))                                     self.encode(param))
269              self.file.write('\t\t</projection>\n')              self.close_element("projection")
270    
271      def write_layer(self, layer, attrs = None):      def write_layer(self, layer, attrs = None):
272          """Write the layer.          """Write the layer.
# Line 154  class Saver: Line 275  class Saver:
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          """          """
278    
279          if attrs is None:          if attrs is None:
280              attrs = {}              attrs = {}
281          attrs["title"] = layer.title  
282          attrs["filename"] = relative_filename(self.dir, layer.filename)          attrs["title"]   = layer.title
283          attrs["stroke_width"] = str(layer.stroke_width)          attrs["visible"] = ("false", "true")[int(layer.Visible())]
284          fill = layer.fill  
285          if fill is None:          if isinstance(layer, Layer):
286              attrs["fill"] = "None"              attrs["shapestore"]   = self.get_id(layer.ShapeStore())
287          else:  
288              attrs["fill"] = fill.hex()              lc = layer.GetClassification()
289          stroke = layer.stroke              attrs["stroke"] = lc.GetDefaultLineColor().hex()
290          if stroke is None:              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
291              attrs["stroke"] = "None"              attrs["fill"] = lc.GetDefaultFill().hex()
292          else:  
293              attrs["stroke"] = stroke.hex()              self.open_element("layer", attrs)
294          self.write_element("layer", attrs, empty = 1, indentation = "\t\t")              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):
304            """Write Classification information."""
305    
306            if attrs is None:
307                attrs = {}
308    
309            lc = layer.GetClassification()
310    
311            field = layer.GetClassificationColumn()
312    
313            #
314            # there isn't a classification of anything so do nothing
315            #
316            if field is None: return
317    
318            attrs["field"] = field
319            attrs["field_type"] = str(layer.GetFieldType(field))
320            self.open_element("classification", attrs)
321    
322            for g in lc:
323                if isinstance(g, ClassGroupDefault):
324                    open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
325                    close_el = 'clnull'
326                elif isinstance(g, ClassGroupSingleton):
327                    if layer.GetFieldType(field) == FIELDTYPE_STRING:
328                        value = self.encode(g.GetValue())
329                    else:
330                        value = str(g.GetValue())
331                    open_el  = 'clpoint label="%s" value="%s"' \
332                               % (self.encode(g.GetLabel()), value)
333                    close_el = 'clpoint'
334                elif isinstance(g, ClassGroupRange):
335                    open_el  = 'clrange label="%s" range="%s"' \
336                              % (self.encode(g.GetLabel()), str(g.GetRange()))
337                    close_el = 'clrange'
338                else:
339                    assert False, _("Unsupported group type in classification")
340                    continue
341    
342                data = g.GetProperties()
343                dict = {'stroke'      : data.GetLineColor().hex(),
344                        'stroke_width': str(data.GetLineWidth()),
345                        'fill'        : data.GetFill().hex()}
346    
347                self.open_element(open_el)
348                self.write_element("cldata", dict)
349                self.close_element(close_el)
350    
351            self.close_element("classification")
352    
353      def write_label_layer(self, layer):      def write_label_layer(self, layer):
354          """Write the label layer.          """Write the label layer.
355          """          """
356          labels = layer.Labels()          labels = layer.Labels()
357          if labels:          if labels:
358              self.file.write('\t\t<labellayer>\n')              self.open_element('labellayer')
359              for label in labels:              for label in labels:
360                  self.file.write(('\t\t\t<label x="%g" y="%g" text="%s"'                  self.write_element(('label x="%g" y="%g" text="%s"'
361                                   ' halign="%s" valign="%s"/>\n')                                      ' halign="%s" valign="%s"')
362                                  % (label.x, label.y, label.text, label.halign,                                  % (label.x, label.y,
363                                       self.encode(label.text),
364                                       label.halign,
365                                     label.valign))                                     label.valign))
366              self.file.write('\t\t</labellayer>\n')              self.close_element('labellayer')
367    
368    
369    
# Line 193  def save_session(session, file, saver_cl Line 374  def save_session(session, file, saver_cl
374    
375      The optional argument saver_class is the class to use to serialize      The optional argument saver_class is the class to use to serialize
376      the session. By default or if it's None, the saver class will be      the session. By default or if it's None, the saver class will be
377      Saver.      SessionSaver.
378    
379      If writing the session is successful call the session's      If writing the session is successful call the session's
380      UnsetModified method      UnsetModified method
381      """      """
382      if saver_class is None:      if saver_class is None:
383          saver_class = Saver          saver_class = SessionSaver
384      saver = saver_class(session)      saver = saver_class(session)
385      saver.write(file)      saver.write(file)
386    
Legend:
Removed from v.268  
changed lines
  Added in v.2104
[email protected]
 ViewVC Help
Powered by ViewVC 1.1.26