/[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 1189 by jonathan, Thu Jun 12 17:01:13 2003 UTC
# Line 6  Line 6 
6  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
7    
8  import os  import os
9    import os.path
10    
11  import Thuban  import Thuban
12  from Thuban import _  from Thuban import _
13    
14  from Thuban.Model.load import XMLReader  from Thuban.Lib.fileutil import get_application_dir
15  from Thuban.Model.save import XMLWriter  
16    from Thuban.Model.xmlreader import XMLReader
17    from Thuban.Model.xmlwriter import XMLWriter
18  from Thuban.Model.proj import Projection, ProjFile  from Thuban.Model.proj import Projection, ProjFile
19  from xml.sax import SAXParseException  from xml.sax import SAXParseException
20    
21  projdir = \  projdir = \
22          os.path.join(Thuban.__path__[0], os.pardir, "Resources", "Projections")          os.path.join(Thuban.__path__[0], os.pardir, "Resources", "Projections")
23    
 usrdir  = os.path.expanduser("~/.thuban")  
24    
25  PROJ_EXT = ".proj"  PROJ_EXT = ".proj"
26    
27  def ReadProjFile(filename):  has_gdal_support = lambda: False
28    try:
29        import gdal
30        """Return True if the gdal library is available."""
31        has_gdal_support = lambda: True
32    except ImportError:
33        pass
34    
35    def read_proj_file(filename):
36      """Read a single .proj file and return a ProjFile object.      """Read a single .proj file and return a ProjFile object.
37            
38      Raises IOError if the file cannot be opened.      Raises IOError if the file cannot be opened.
# Line 33  def ReadProjFile(filename): Line 44  def ReadProjFile(filename):
44      handler.read(filename)      handler.read(filename)
45      return handler.GetProjFile()      return handler.GetProjFile()
46    
47  def WriteProjFile(pf):  def write_proj_file(pf):
48      """Write a single .proj file      """Write a single .proj file
49    
50      Raises IOError if the file cannot be written.      Raises IOError if the file cannot be written.
# Line 42  def WriteProjFile(pf): Line 53  def WriteProjFile(pf):
53      saver = ProjFileSaver(pf)      saver = ProjFileSaver(pf)
54      saver.write(pf.GetFilename())      saver.write(pf.GetFilename())
55    
56  def GetProjFiles(dir):  def get_proj_files(dir):
57      """Read all .proj files in the given directory and      """Read all .proj files in the given directory and
58      return a list of ProjFile objects.      return a list of ProjFile objects.
59      """      """
# Line 56  def GetProjFiles(dir): Line 67  def GetProjFiles(dir):
67          for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):          for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):
68              try:              try:
69                  filename = os.path.join(dir, file)                  filename = os.path.join(dir, file)
70                  list.append(ReadProjFile(filename))                  list.append(read_proj_file(filename))
71              except (OSError, IOError, SAXParseException):              except (OSError, IOError, SAXParseException):
72                  pass # just move onto the next file                  pass # just move onto the next file
73    
74      return list      return list
75    
76  def GetSystemProjFiles():  def get_system_proj_files():
77      """Return a list of ProjFile objects from files that are      """Return a list of ProjFile objects from files that are
78      supplied by Thuban.      supplied by Thuban.
79    
# Line 71  def GetSystemProjFiles(): Line 82  def GetSystemProjFiles():
82      """      """
83      filename = os.path.join(projdir, "defaults.proj")      filename = os.path.join(projdir, "defaults.proj")
84      try:      try:
85          return [ReadProjFile(filename)]          return [read_proj_file(filename)]
86      except (OSError, IOError, SAXParseException):      except (OSError, IOError, SAXParseException):
87          return [ProjFile(filename)]          return [ProjFile(filename)]
88    
89  def GetUserProjFiles():  def get_user_proj_files():
90      """Return a list of ProjFile objects from files that are user-defined.      """Return a list of ProjFile objects from files that are user-defined.
91    
92      If no files could not be opened return a list with one      If no files could not be opened return a list with one
93      empty projection file set to store data in the default file.      empty projection file set to store data in the default file.
94      """      """
95    
96        usrdir  = get_application_dir()
97      filename = os.path.join(usrdir, "user.proj")      filename = os.path.join(usrdir, "user.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    
# Line 118  class ProjFileReader(XMLReader): Line 130  class ProjFileReader(XMLReader):
130      def GetProjFile(self):      def GetProjFile(self):
131          return self.__pf          return self.__pf
132    
   
133  class ProjFileSaver(XMLWriter):  class ProjFileSaver(XMLWriter):
134    
135      def __init__(self, pf):      def __init__(self, pf):
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