/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 414 by jonathan, Wed Feb 19 16:52:23 2003 UTC revision 2616 by jonathan, Fri May 6 14:17:29 2005 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 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)
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    # $Id$
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 \
26  # one level of indention      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
27  #  from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
28  TAB = "    "  from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
29    from Thuban.Model.data import DerivedShapeStore, FileShapeStore, \
30                                  SHAPETYPE_POINT
31    
32    from Thuban.Model.xmlwriter import XMLWriter
33    from postgisdb import PostGISConnection, PostGISShapeStore
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 37  def relative_filename(dir, filename): Line 44  def relative_filename(dir, filename):
44      else:      else:
45          return filename          return filename
46    
47  def escape(data):  
48      """Escape &, \", ', <, and > in a string of data.  def unify_filename(filename):
49        """Return a 'unified' version of filename
50    
51        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      data = string.replace(data, "&", "&amp;")      if os.name == "posix":
57      data = string.replace(data, "<", "&lt;")          return filename
58      data = string.replace(data, ">", "&gt;")      elif os.name == "nt":
59      data = string.replace(data, '"', "&quot;")          return "/".join(filename.split("\\"))
60      data = string.replace(data, "'", "&apos;")      else:
61      return data          raise RuntimeError("Unsupported platform for unify_filename: %s"
62                               % os.name)
63    
64    def sort_data_stores(stores):
65        """Return a topologically sorted version of the sequence of data containers
66    
67        The list is sorted so that data containers that depend on other data
68        containers have higher indexes than the containers they depend on.
69        """
70        if not stores:
71            return []
72        processed = {}
73        result = []
74        todo = stores[:]
75        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:
89                result.append(container)
90                processed[id(container)] = 1
91        return result
92    
93    def bool2str(b):
94        if b: return "true"
95        else: return "false"
96    
97  class Saver:  class SessionSaver(XMLWriter):
98    
99      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
100    
101      Applications built on top of Thuban may derive from this class and      Applications built on top of Thuban may derive from this class and
102      override or extend the methods to save additinal information. This      override or extend the methods to save additional information. This
103      additional information should take the form of additional attributes      additional information should take the form of additional attributes
104      or elements whose names are prefixed with a namespace. To define a      or elements whose names are prefixed with a namespace. To define a
105      namespace derived classes should extend the write_session method to      namespace derived classes should extend the write_session method to
# Line 61  class Saver: Line 108  class Saver:
108    
109    
110      def __init__(self, session):      def __init__(self, session):
111            XMLWriter.__init__(self)
112          self.session = session          self.session = session
113            # Map object ids to the ids used in the thuban files
114            self.idmap = {}
115    
116      def write(self, file_or_filename):      def get_id(self, obj):
117          """Write the session to a file.          """Return the id used in the thuban file for the object obj"""
118            return self.idmap.get(id(obj))
119          The argument may be either a file object or a filename. If it's  
120          a filename, the file will be opened for writing. Files of      def define_id(self, obj, value = None):
121          shapefiles will be stored as filenames relative to the directory          if value is None:
122          the file is stored in (as given by os.path.dirname(filename)) if              value = "D" + str(id(obj))
123          they have a common parent directory other than the root          self.idmap[id(obj)] = value
124          directory.          return value
125    
126          If the argument is a file object (which is determined by the      def has_id(self, obj):
127          presence of a write method) all filenames will be absolut          return self.idmap.has_key(id(obj))
128          filenames.  
129        def prepare_filename(self, filename):
130            """Return the string to use when writing filename to the thuban file
131    
132            The returned string is a unified version (only slashes as
133            directory separators, see unify_filename) of filename expressed
134            relative to the directory the .thuban file is written to.
135          """          """
136            return unify_filename(relative_filename(self.dir, filename))
137    
138          # keep track of how many levels of indentation to write      def write(self, file_or_filename):
139          self.indent_level = 0          XMLWriter.write(self, file_or_filename)
         # 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:  
             filename = file_or_filename  
             self.dir = os.path.dirname(filename)  
             self.file = open(filename, 'w')  
         self.write_header()  
         self.write_session(self.session)  
   
         if self.indent_level != 0:  
             raise ValueError("indent_level still positive!")  
   
     def write_attribs(self, attrs):  
         for name, value in attrs.items():  
             if isinstance(value, Color):  
                 value = value.hex()  
             else:  
                 value = str(value)  
             self.file.write(' %s="%s"' % (escape(name), escape(value)))  
       
     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  
         if self.indent_level < 0:  
             raise ValueError("close_element called too many times!")  
   
         # 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))  
140    
141      def write_element(self, element, attrs = {}):          self.write_header("session", "thuban-1.1.dtd")
142          """write an element that won't need a closing tag"""          self.write_session(self.session)
143          self.open_element(element, attrs)          self.close()
         self.close_element(element)  
   
     def write_header(self):  
         """Write the XML header"""  
         self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n')  
         self.file.write('<!DOCTYPE session SYSTEM "thuban.dtd">\n')  
144    
145      def write_session(self, session, attrs = None, namespaces = ()):      def write_session(self, session, attrs = None, namespaces = ()):
146          """Write the session and its contents          """Write the session and its contents
# Line 168  class Saver: Line 163  class Saver:
163          attrs["title"] = session.title          attrs["title"] = session.title
164          for name, uri in namespaces:          for name, uri in namespaces:
165              attrs["xmlns:" + name] = uri              attrs["xmlns:" + name] = uri
166            # default name space
167            attrs["xmlns"] = \
168                   "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
169          self.open_element("session", attrs)          self.open_element("session", attrs)
170            self.write_db_connections(session)
171            self.write_data_containers(session)
172          for map in session.Maps():          for map in session.Maps():
173              self.write_map(map)              self.write_map(map)
174          self.close_element("session")          self.close_element("session")
175    
176        def write_db_connections(self, session):
177            for conn in session.DBConnections():
178                if isinstance(conn, PostGISConnection):
179                    self.write_element("dbconnection",
180                                       {"id": self.define_id(conn),
181                                        "dbtype": "postgis",
182                                        "host": conn.host,
183                                        "port": conn.port,
184                                        "user": conn.user,
185                                        "dbname": conn.dbname})
186                else:
187                    raise ValueError("Can't handle db connection %r" % conn)
188    
189        def write_data_containers(self, session):
190            containers = sort_data_stores(session.DataContainers())
191            for container in containers:
192                if isinstance(container, AutoTransientTable):
193                    # AutoTransientTable instances are invisible in the
194                    # thuban files. They're only used internally. To make
195                    # sure that containers depending on AutoTransientTable
196                    # instances refer to the right real containers we give
197                    # the AutoTransientTable instances the same id as the
198                    # source they depend on.
199                    self.define_id(container,
200                                   self.get_id(container.Dependencies()[0]))
201                    continue
202    
203                idvalue = self.define_id(container)
204                if isinstance(container, FileShapeStore):
205                    self.define_id(container.Table(), idvalue)
206                    filename = self.prepare_filename(container.FileName())
207                    self.write_element("fileshapesource",
208                                       {"id": idvalue, "filename": filename,
209                                        "filetype": container.FileType()})
210                elif isinstance(container, DerivedShapeStore):
211                    shapesource, table = container.Dependencies()
212                    self.write_element("derivedshapesource",
213                                       {"id": idvalue,
214                                        "shapesource": self.get_id(shapesource),
215                                        "table": self.get_id(table)})
216                elif isinstance(container, PostGISShapeStore):
217                    conn = container.DBConnection()
218                    self.write_element("dbshapesource",
219                                       {"id": idvalue,
220                                        "dbconn": self.get_id(conn),
221                                        "tablename": container.TableName(),
222                                        "id_column": container.IDColumn().name,
223                                        "geometry_column":
224                                          container.GeometryColumn().name,
225                                        })
226                elif isinstance(container, DBFTable):
227                    filename = self.prepare_filename(container.FileName())
228                    self.write_element("filetable",
229                                       {"id": idvalue,
230                                        "title": container.Title(),
231                                        "filename": filename,
232                                        "filetype": "DBF"})
233                elif isinstance(container, TransientJoinedTable):
234                    left, right = container.Dependencies()
235                    left_field = container.left_field
236                    right_field = container.right_field
237                    self.write_element("jointable",
238                                       {"id": idvalue,
239                                        "title": container.Title(),
240                                        "right": self.get_id(right),
241                                        "rightcolumn": right_field,
242                                        "left": self.get_id(left),
243                                        "leftcolumn": left_field,
244                                        "jointype": container.JoinType()})
245                else:
246                    raise ValueError("Can't handle container %r" % container)
247    
248    
249      def write_map(self, map):      def write_map(self, map):
250          """Write the map and its contents.          """Write the map and its contents.
251    
# Line 181  class Saver: Line 254  class Saver:
254          element, call write_layer for each layer contained in the map          element, call write_layer for each layer contained in the map
255          and finally call write_label_layer to write the label layer.          and finally call write_label_layer to write the label layer.
256          """          """
257          write = self.file.write          self.open_element('map title="%s"' % self.encode(map.title))
         self.open_element('map title="%s"' % escape(map.title))  
258          self.write_projection(map.projection)          self.write_projection(map.projection)
259          for layer in map.Layers():          for layer in map.Layers():
260              self.write_layer(layer)              self.write_layer(layer)
# Line 193  class Saver: Line 265  class Saver:
265          """Write the projection.          """Write the projection.
266          """          """
267          if projection and len(projection.params) > 0:          if projection and len(projection.params) > 0:
268              self.open_element("projection")              attrs = {"name": projection.GetName()}
269                epsg = projection.EPSGCode()
270                if epsg is not None:
271                    attrs["epsg"] = epsg
272                self.open_element("projection", attrs)
273              for param in projection.params:              for param in projection.params:
274                  self.write_element('parameter value="%s"' % escape(param))                  self.write_element('parameter value="%s"' %
275                                       self.encode(param))
276              self.close_element("projection")              self.close_element("projection")
277    
278      def write_layer(self, layer, attrs = None):      def write_layer(self, layer, attrs = None):
# Line 205  class Saver: Line 282  class Saver:
282          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
283          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
284          """          """
         lc = layer.GetClassification()  
285    
286          if attrs is None:          if attrs is None:
287              attrs = {}              attrs = {}
288          attrs["title"] = layer.title  
289          attrs["filename"] = relative_filename(self.dir, layer.filename)          attrs["title"]   = layer.title
290          attrs["stroke"] = lc.GetDefaultStroke().hex()          attrs["visible"] = bool2str(layer.Visible())
291          attrs["stroke_width"] = str(lc.GetDefaultStrokeWidth())  
292          attrs["fill"] = lc.GetDefaultFill().hex()          if isinstance(layer, Layer):
293                attrs["shapestore"]   = self.get_id(layer.ShapeStore())
294          #fill = lc.GetDefaultFill()  
295          #if fill is None:              lc = layer.GetClassification()
296              #attrs["fill"] = "None"              attrs["stroke"] = lc.GetDefaultLineColor().hex()
297          #else:              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
298              #attrs["fill"] = fill.hex()              attrs["fill"] = lc.GetDefaultFill().hex()
299    
300                self.open_element("layer", attrs)
301          #stroke = lc.GetDefaultStroke()              self.write_projection(layer.GetProjection())
302          #if stroke is None:              self.write_classification(layer)
303              #attrs["stroke"] = "None"              self.close_element("layer")
304          #else:          elif isinstance(layer, RasterLayer):
305              #attrs["stroke"] = stroke.hex()              attrs["filename"] = self.prepare_filename(layer.filename)
306    
307          self.open_element("layer", attrs)              masknames = ["none", "bit", "alpha"]
308          self.write_classification(layer)  
309          self.close_element("layer")              if layer.MaskType() != layer.MASK_BIT:
310                    attrs["masktype"] = masknames[layer.MaskType()]
311    
312                if layer.Opacity() != 1:
313                    attrs["opacity"] = str(layer.Opacity())
314    
315                self.open_element("rasterlayer", attrs)
316                self.write_projection(layer.GetProjection())
317                self.close_element("rasterlayer")
318    
319      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
320            """Write Classification information."""
321    
322          if attrs is None:          if attrs is None:
323              attrs = {}              attrs = {}
324    
325          lc = layer.GetClassification()          lc = layer.GetClassification()
326    
327          field = lc.field          field = layer.GetClassificationColumn()
328    
329          #          #
330          # there isn't a classification of anything          # there isn't a classification of anything so do nothing
         # so don't do anything  
331          #          #
332          if field is None: return          if field is None: return
333    
334          attrs["field"] = field          attrs["field"] = field
335            attrs["field_type"] = str(layer.GetFieldType(field))
336          self.open_element("classification", attrs)          self.open_element("classification", attrs)
337    
338          def write_class_data(data):          for g in lc:
339              dict = {'stroke'      : data.GetStroke().hex(),              if isinstance(g, ClassGroupDefault):
340                      'stroke_width': str(data.GetStrokeWidth()),                  open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
341                    close_el = 'clnull'
342                elif isinstance(g, ClassGroupSingleton):
343                    if layer.GetFieldType(field) == FIELDTYPE_STRING:
344                        value = self.encode(g.GetValue())
345                    else:
346                        value = str(g.GetValue())
347                    open_el  = 'clpoint label="%s" value="%s"' \
348                               % (self.encode(g.GetLabel()), value)
349                    close_el = 'clpoint'
350                elif isinstance(g, ClassGroupRange):
351                    open_el  = 'clrange label="%s" range="%s"' \
352                              % (self.encode(g.GetLabel()), str(g.GetRange()))
353                    close_el = 'clrange'
354                else:
355                    assert False, _("Unsupported group type in classification")
356                    continue
357    
358                data = g.GetProperties()
359                dict = {'stroke'      : data.GetLineColor().hex(),
360                        'stroke_width': str(data.GetLineWidth()),
361                      'fill'        : data.GetFill().hex()}                      'fill'        : data.GetFill().hex()}
             self.write_element("cldata", dict)  
362    
363          self.open_element("clnull")              # only for point layers write the size attribute
364          write_class_data(lc.GetDefaultData())              if layer.ShapeType() == SHAPETYPE_POINT:
365          self.close_element("clnull")                  dict['size'] =  str(data.GetSize())
366                
367          if lc.points != {}:              self.open_element(open_el)
368              for p in lc.points.values():              self.write_element("cldata", dict)
369                  self.open_element('clpoint value="%s"' %              self.close_element(close_el)
                     (escape(str(p.GetValue()))))  
                 write_class_data(p)  
                 self.close_element('clpoint')  
             
         if lc.ranges != []:  
             for p in lc.ranges:  
                 self.open_element('clrange min="%s" max="%s"'  
                     % (escape(str(p.GetMin())), escape(str(p.GetMax()))))  
                 write_class_data(p)  
                 self.close_element('clrange')  
370    
371          self.close_element("classification")          self.close_element("classification")
372    
# Line 284  class Saver: Line 379  class Saver:
379              for label in labels:              for label in labels:
380                  self.write_element(('label x="%g" y="%g" text="%s"'                  self.write_element(('label x="%g" y="%g" text="%s"'
381                                      ' halign="%s" valign="%s"')                                      ' halign="%s" valign="%s"')
382                                  % (label.x, label.y, label.text, label.halign,                                  % (label.x, label.y,
383                                       self.encode(label.text),
384                                       label.halign,
385                                     label.valign))                                     label.valign))
386              self.close_element('labellayer')              self.close_element('labellayer')
387    
# Line 297  def save_session(session, file, saver_cl Line 394  def save_session(session, file, saver_cl
394    
395      The optional argument saver_class is the class to use to serialize      The optional argument saver_class is the class to use to serialize
396      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
397      Saver.      SessionSaver.
398    
399      If writing the session is successful call the session's      If writing the session is successful call the session's
400      UnsetModified method      UnsetModified method
401      """      """
402      if saver_class is None:      if saver_class is None:
403          saver_class = Saver          saver_class = SessionSaver
404      saver = saver_class(session)      saver = saver_class(session)
405      saver.write(file)      saver.write(file)
406    
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