/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/resource.py
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revision 875 by jonathan, Fri May 9 16:31:39 2003 UTC revision 1755 by bh, Fri Sep 26 14:03:44 2003 UTC
# Line 5  Line 5 
5  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
6  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
7    
8    """Handle resources loaded from files such as projections"""
9    
10    __version__ = "$Revision$"
11    # $Source$
12    # $Id$
13    
14    
15  import os  import os
16    import os.path
17    
18  import Thuban  import Thuban
19  from Thuban import _  from Thuban import _
20    
21  from Thuban.Model.load import XMLReader  from Thuban.Lib.fileutil import get_application_dir
22  from Thuban.Model.save import XMLWriter  
23    from Thuban.Model.xmlreader import XMLReader
24    from Thuban.Model.xmlwriter import XMLWriter
25  from Thuban.Model.proj import Projection, ProjFile  from Thuban.Model.proj import Projection, ProjFile
26  from xml.sax import SAXParseException  from xml.sax import SAXParseException
27    
28  projdir = \  projdir = \
29          os.path.join(Thuban.__path__[0], os.pardir, "Resources", "Projections")          os.path.join(Thuban.__path__[0], os.pardir, "Resources", "Projections")
30    
 usrdir  = os.path.expanduser("~/.thuban")  
31    
32  PROJ_EXT = ".proj"  PROJ_EXT = ".proj"
33    
34  def ReadProjFile(filename):  has_gdal_support = lambda: False
35    try:
36        # first try to see if our extension module is there. if it
37        # wasn't even compiled, we obviously don't have gdal support.
38        import gdalwarp
39    
40        # now try to import the python extension. if this doesn't
41        # exist then we can't do anything.
42        import gdal
43    
44        """Return True if the gdal library is available."""
45        has_gdal_support = lambda: True
46    except ImportError:
47        pass
48    
49    def read_proj_file(filename):
50      """Read a single .proj file and return a ProjFile object.      """Read a single .proj file and return a ProjFile object.
51            
52      Raises IOError if the file cannot be opened.      Raises IOError if the file cannot be opened.
# Line 33  def ReadProjFile(filename): Line 58  def ReadProjFile(filename):
58      handler.read(filename)      handler.read(filename)
59      return handler.GetProjFile()      return handler.GetProjFile()
60    
61  def WriteProjFile(pf):  def write_proj_file(pf):
62      """Write a single .proj file      """Write a single .proj file
63    
64      Raises IOError if the file cannot be written.      Raises IOError if the file cannot be written.
# Line 42  def WriteProjFile(pf): Line 67  def WriteProjFile(pf):
67      saver = ProjFileSaver(pf)      saver = ProjFileSaver(pf)
68      saver.write(pf.GetFilename())      saver.write(pf.GetFilename())
69    
70  def GetProjFiles(dir):  def get_proj_files(dir):
71      """Read all .proj files in the given directory and      """Read all .proj files in the given directory and
72      return a list of ProjFile objects.      return a list of ProjFile objects.
73      """      """
# Line 56  def GetProjFiles(dir): Line 81  def GetProjFiles(dir):
81          for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):          for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):
82              try:              try:
83                  filename = os.path.join(dir, file)                  filename = os.path.join(dir, file)
84                  list.append(ReadProjFile(filename))                  list.append(read_proj_file(filename))
85              except (OSError, IOError, SAXParseException):              except (OSError, IOError, SAXParseException):
86                  pass # just move onto the next file                  pass # just move onto the next file
87    
88      return list      return list
89    
90  def GetSystemProjFiles():  def get_system_proj_files():
91      """Return a list of ProjFile objects from files that are      """Return a list of ProjFile objects from files that are
92      supplied by Thuban.      supplied by Thuban.
93    
# Line 71  def GetSystemProjFiles(): Line 96  def GetSystemProjFiles():
96      """      """
97      filename = os.path.join(projdir, "defaults.proj")      filename = os.path.join(projdir, "defaults.proj")
98      try:      try:
99          return [ReadProjFile(filename)]          return [read_proj_file(filename)]
100      except (OSError, IOError, SAXParseException):      except (OSError, IOError, SAXParseException):
101          return [ProjFile(filename)]          return [ProjFile(filename)]
102    
103  def GetUserProjFiles():  def get_user_proj_files():
104      """Return a list of ProjFile objects from files that are user-defined.      """Return a list of ProjFile objects from files that are user-defined.
105    
106      If no files could not be opened return a list with one      If no files could not be opened return a list with one
107      empty projection file set to store data in the default file.      empty projection file set to store data in the default file.
108      """      """
109    
110        usrdir  = get_application_dir()
111      filename = os.path.join(usrdir, "user.proj")      filename = os.path.join(usrdir, "user.proj")
112      try:      try:
113          return [ReadProjFile(filename)]          return [read_proj_file(filename)]
114      except (OSError, IOError, SAXParseException):      except (OSError, IOError, SAXParseException):
115          return [ProjFile(filename)]          return [ProjFile(filename)]
116    
# Line 118  class ProjFileReader(XMLReader): Line 144  class ProjFileReader(XMLReader):
144      def GetProjFile(self):      def GetProjFile(self):
145          return self.__pf          return self.__pf
146    
   
147  class ProjFileSaver(XMLWriter):  class ProjFileSaver(XMLWriter):
148    
149      def __init__(self, pf):      def __init__(self, pf):
# Line 128  class ProjFileSaver(XMLWriter): Line 153  class ProjFileSaver(XMLWriter):
153      def write(self, file_or_filename):      def write(self, file_or_filename):
154          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
155    
156          self.write_header("projfile", "projfile.dtd")          self.write_header("projectionlist", "projfile.dtd")
157          self.write_projfile(self.__pf)          self.write_projfile(self.__pf)
158          self.close()          self.close()
159    
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