/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/resource.py
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revision 709 by jonathan, Wed Apr 23 08:45:44 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.Model.load import XMLReader  from Thuban import _
20  from Thuban.Model.save import XMLWriter  
21    from Thuban.Lib.fileutil import get_application_dir
22    
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
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      """Read a single .proj file and return a ProjFile object."""  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.
51        
52        Raises IOError if the file cannot be opened.
53        Raises OSError if the file cannot be read.
54        Raises SAXParseException if the file is not valid XML.
55        """
56    
57      projs = []      handler = ProjFileReader()
58      try:      handler.read(filename)
59          handler = ProjFileReader()      return handler.GetProjFile()
         handler.read(filename)  
         pf = handler.GetProjFile()  
     except OSError:  
         pass  
60    
61      return pf  def write_proj_file(pf):
62        """Write a single .proj file
63    
64        Raises IOError if the file cannot be written.
65        """
66    
 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      """      """
74    
75      list = []      list = []
76      try:      try:
77          for file in filter(lambda s: s.endswith(PROJ_EXT), os.listdir(dir)):          dirlist = os.listdir(dir)
             filename = os.path.join(dir, file)  
             list.append(ReadProjFile(filename))  
78      except OSError:      except OSError:
79          pass          pass # if we can't get a directory listing just return []
80        else:
81            for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):
82                try:
83                    filename = os.path.join(dir, file)
84                    list.append(read_proj_file(filename))
85                except (OSError, IOError, SAXParseException):
86                    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    
94        If no files could not be opened return a list with one
95        empty projection file set to store data in the default file.
96      """      """
97      return GetProjFiles(projdir)      filename = os.path.join(projdir, "defaults.proj")
98        try:
99            return [read_proj_file(filename)]
100        except (OSError, IOError, SAXParseException):
101            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      return GetProjFiles(usrdir)  
106        If no files could not be opened return a list with one
107        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")
112        try:
113            return [read_proj_file(filename)]
114        except (OSError, IOError, SAXParseException):
115            return [ProjFile(filename)]
116    
117  class ProjFileReader(XMLReader):  class ProjFileReader(XMLReader):
118    
# Line 73  class ProjFileReader(XMLReader): Line 127  class ProjFileReader(XMLReader):
127      def read(self, file_or_filename):      def read(self, file_or_filename):
128          XMLReader.read(self, file_or_filename)          XMLReader.read(self, file_or_filename)
129    
130          self.__pf.SetFileName(XMLReader.GetFileName(self))          self.__pf.SetFilename(XMLReader.GetFilename(self))
131                    
132      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
133          self.params = []          self.params = []
134          self.name = attrs.get((None, 'name'), "Unknown")          self.name = self.encode(attrs.get((None, 'name'), _("Unknown")))
135    
136      def end_projection(self, name, qname):      def end_projection(self, name, qname):
137          self.__pf.Add(Projection(self.params, self.name))          self.__pf.Add(Projection(self.params, self.name))
# Line 90  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 100  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", "thuban.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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