/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/resource.py
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revision 1791 by jan, Wed Oct 8 14:47:53 2003 UTC revision 1830 by bh, Thu Oct 16 16:36:00 2003 UTC
# Line 14  __version__ = "$Revision$" Line 14  __version__ = "$Revision$"
14    
15  import os  import os
16  import os.path  import os.path
17    import weakref
18    
19  import Thuban  import Thuban
20  from Thuban import _  from Thuban import _
# Line 46  try: Line 47  try:
47  except ImportError:  except ImportError:
48      pass      pass
49    
50    projfile_cache = weakref.WeakValueDictionary()
51    
52    def clear_proj_file_cache():
53        """Clear the cache of ProjFile objects maintained by read_proj_file.
54    
55        This function is probably only useful for the test suite.
56        """
57        projfile_cache.clear()
58    
59  def read_proj_file(filename):  def read_proj_file(filename):
60      """Read a .proj file and return a ProjFile object and warnings      """Read a .proj file and return a ProjFile object and warnings
61    
62      The return value is a tuple with the ProjFile object and a list of      The return value is a tuple with the ProjFile object and a list of
63      strings with warnings messages that might have been generated by the      strings with warnings messages that might have been generated by the
64      proj ifle parser.      proj file parser.
65    
66        The objects returned cached so that reading the same file
67        (identified by its absolute name) several times yields the same
68        ProjFile object. The cache uses weak references so the objects will
69        be removed from the cache once the last reference an object in the
70        cache is removed.
71    
72      Raises IOError if the file cannot be opened, OSError if the file      Raises IOError if the file cannot be opened, OSError if the file
73      cannot be read and SAXParseException if the file is not valid XML.      cannot be read and SAXParseException if the file is not valid XML.
74      """      """
75      handler = ProjFileReader()      filename = os.path.abspath(filename)
76      handler.read(filename)      if filename in projfile_cache:
77      return handler.GetProjFile(), handler.GetWarnings()          return projfile_cache[filename], []
78        else:
79            handler = ProjFileReader()
80            handler.read(filename)
81            proj_file = handler.GetProjFile()
82            projfile_cache[filename] = proj_file
83            return proj_file, handler.GetWarnings()
84    
85  def write_proj_file(pf):  def write_proj_file(pf):
86      """Write a single .proj file      """Write a single .proj file
# Line 132  class ProjFileReader(XMLReader): Line 154  class ProjFileReader(XMLReader):
154          if name is None:          if name is None:
155              name = _("Unknown")              name = _("Unknown")
156          self.name = name          self.name = name
157            self.epsg = self.encode(attrs.get((None, 'epsg')))
158    
159      def end_projection(self, name, qname):      def end_projection(self, name, qname):
160          try:          try:
161              proj = Projection(self.params, self.name)              proj = Projection(self.params, self.name, epsg = self.epsg)
162          except IOError, val:          except IOError, val:
163              self.warnings.append(_('Error in projection "%s": %s')              self.warnings.append(_('Error in projection "%s": %s')
164                                   % (self.name, str(val)))                                   % (self.name, str(val)))
# Line 173  class ProjFileSaver(XMLWriter): Line 196  class ProjFileSaver(XMLWriter):
196          self.open_element("projectionlist")          self.open_element("projectionlist")
197    
198          for p in pf.GetProjections():          for p in pf.GetProjections():
199              self.open_element("projection", {"name": p.GetName()})              attrs = {"name": p.GetName()}
200                if p.EPSGCode():
201                    attrs["epsg"] = p.EPSGCode()
202                self.open_element("projection", attrs)
203    
204              for param in p.GetAllParameters():              for param in p.GetAllParameters():
205                  self.write_element("parameter", {"value": param})                  self.write_element("parameter", {"value": param})
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