/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/resource.py
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revision 718 by jonathan, Wed Apr 23 10:39:46 2003 UTC revision 1179 by jonathan, Thu Jun 12 16:12:56 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.Model.load import XMLReader  from Thuban import _
13  from Thuban.Model.save import XMLWriter  
14    from Thuban.Lib.fileutil import get_application_dir
15    
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
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    
24  usrdir  = os.path.expanduser("~/.thuban")  usrdir  = get_application_dir()
25    
26  PROJ_EXT = ".proj"  PROJ_EXT = ".proj"
27    
28  def ReadProjFile(filename):  has_gdal_support = lambda: False
29    try:
30        import gdal
31        """Return True if the gdal library is available."""
32        has_gdal_support = lambda: True
33    except ImportError:
34        pass
35    
36    def read_proj_file(filename):
37      """Read a single .proj file and return a ProjFile object.      """Read a single .proj file and return a ProjFile object.
38            
39      Raises IOError if the file cannot be opened.      Raises IOError if the file cannot be opened.
# Line 30  def ReadProjFile(filename): Line 45  def ReadProjFile(filename):
45      handler.read(filename)      handler.read(filename)
46      return handler.GetProjFile()      return handler.GetProjFile()
47    
48  def WriteProjFile(pf):  def write_proj_file(pf):
49        """Write a single .proj file
50    
51        Raises IOError if the file cannot be written.
52        """
53    
54      saver = ProjFileSaver(pf)      saver = ProjFileSaver(pf)
55      saver.write(pf.GetFileName())      saver.write(pf.GetFilename())
56    
57  def GetProjFiles(dir):  def get_proj_files(dir):
58      """Read all .proj files in the given directory and      """Read all .proj files in the given directory and
59      return a list of ProjFile objects.      return a list of ProjFile objects.
60      """      """
# Line 48  def GetProjFiles(dir): Line 68  def GetProjFiles(dir):
68          for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):          for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):
69              try:              try:
70                  filename = os.path.join(dir, file)                  filename = os.path.join(dir, file)
71                  list.append(ReadProjFile(filename))                  list.append(read_proj_file(filename))
72              except (OSError, IOError, SAXParseException):              except (OSError, IOError, SAXParseException):
73                  pass # just move onto the next file                  pass # just move onto the next file
74    
75      return list      return list
76    
77  def GetSystemProjFiles():  def get_system_proj_files():
78      """Return a list of ProjFile objects from files that are      """Return a list of ProjFile objects from files that are
79      supplied by Thuban.      supplied by Thuban.
80    
81        If no files could not be opened return a list with one
82        empty projection file set to store data in the default file.
83      """      """
84      return GetProjFiles(projdir)      filename = os.path.join(projdir, "defaults.proj")
85        try:
86            return [read_proj_file(filename)]
87        except (OSError, IOError, SAXParseException):
88            return [ProjFile(filename)]
89    
90  def GetUserProjFiles():  def get_user_proj_files():
91      """Return a list of ProjFile objects from files that are user-defined."""      """Return a list of ProjFile objects from files that are user-defined.
92      return GetProjFiles(usrdir)  
93        If no files could not be opened return a list with one
94        empty projection file set to store data in the default file.
95        """
96    
97        filename = os.path.join(usrdir, "user.proj")
98        try:
99            return [read_proj_file(filename)]
100        except (OSError, IOError, SAXParseException):
101            return [ProjFile(filename)]
102    
103  class ProjFileReader(XMLReader):  class ProjFileReader(XMLReader):
104    
# Line 77  class ProjFileReader(XMLReader): Line 113  class ProjFileReader(XMLReader):
113      def read(self, file_or_filename):      def read(self, file_or_filename):
114          XMLReader.read(self, file_or_filename)          XMLReader.read(self, file_or_filename)
115    
116          self.__pf.SetFileName(XMLReader.GetFileName(self))          self.__pf.SetFilename(XMLReader.GetFilename(self))
117                    
118      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
119          self.params = []          self.params = []
120          self.name = attrs.get((None, 'name'), "Unknown")          self.name = self.encode(attrs.get((None, 'name'), _("Unknown")))
121    
122      def end_projection(self, name, qname):      def end_projection(self, name, qname):
123          self.__pf.Add(Projection(self.params, self.name))          self.__pf.Add(Projection(self.params, self.name))
# Line 94  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):
# Line 104  class ProjFileSaver(XMLWriter): Line 139  class ProjFileSaver(XMLWriter):
139      def write(self, file_or_filename):      def write(self, file_or_filename):
140          XMLWriter.write(self, file_or_filename)          XMLWriter.write(self, file_or_filename)
141    
142          self.write_header("projfile", "thuban.dtd")          self.write_header("projfile", "projfile.dtd")
143          self.write_projfile(self.__pf)          self.write_projfile(self.__pf)
144          self.close()          self.close()
145    
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