Thuban/Model/resource.py

# Copyright (c) 2003 by Intevation GmbH
# Authors:
# Jonathan Coles <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

import os
import Thuban
from Thuban import _

from Thuban.Model.load import XMLReader
from Thuban.Model.save import XMLWriter
from Thuban.Model.proj import Projection, ProjFile
from xml.sax import SAXParseException

projdir = \
        os.path.join(Thuban.__path__[0], os.pardir, "Resources", "Projections")

usrdir  = os.path.expanduser("~/.thuban")

PROJ_EXT = ".proj"

def ReadProjFile(filename):
    """Read a single .proj file and return a ProjFile object.
    
    Raises IOError if the file cannot be opened.
    Raises OSError if the file cannot be read.
    Raises SAXParseException if the file is not valid XML.
    """

    handler = ProjFileReader()
    handler.read(filename)
    return handler.GetProjFile()

def WriteProjFile(pf):
    """Write a single .proj file

    Raises IOError if the file cannot be written.
    """

    saver = ProjFileSaver(pf)
    saver.write(pf.GetFilename())

def GetProjFiles(dir):
    """Read all .proj files in the given directory and 
    return a list of ProjFile objects.
    """

    list = []
    try:
        dirlist = os.listdir(dir)
    except OSError:
        pass # if we can't get a directory listing just return []
    else:
        for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):
            try:
                filename = os.path.join(dir, file)
                list.append(ReadProjFile(filename))
            except (OSError, IOError, SAXParseException):
                pass # just move onto the next file

    return list

def GetSystemProjFiles():
    """Return a list of ProjFile objects from files that are 
    supplied by Thuban.

    If no files could not be opened return a list with one
    empty projection file set to store data in the default file.
    """
    filename = os.path.join(projdir, "defaults.proj")
    try:
        return [ReadProjFile(filename)]
    except (OSError, IOError, SAXParseException):
        return [ProjFile(filename)]

def GetUserProjFiles():
    """Return a list of ProjFile objects from files that are user-defined.

    If no files could not be opened return a list with one
    empty projection file set to store data in the default file.
    """

    filename = os.path.join(usrdir, "user.proj")
    try:
        return [ReadProjFile(filename)]
    except (OSError, IOError, SAXParseException):
        return [ProjFile(filename)]

class ProjFileReader(XMLReader):

    def __init__(self):
        XMLReader.__init__(self)
        self.__pf = ProjFile("")

        XMLReader.AddDispatchers(self,
            {'projection': ("start_projection", "end_projection"),
             'parameter':  ("start_parameter", None)})
            
    def read(self, file_or_filename):
        XMLReader.read(self, file_or_filename)

        self.__pf.SetFilename(XMLReader.GetFilename(self))
        
    def start_projection(self, name, qname, attrs):
        self.params = []
        self.name = self.encode(attrs.get((None, 'name'), _("Unknown")))

    def end_projection(self, name, qname):
        self.__pf.Add(Projection(self.params, self.name))

    def start_parameter(self, name, qname, attrs):
        s = attrs.get((None, 'value'))
        s = str(s) # we can't handle unicode in proj
        self.params.append(s)

    def GetProjFile(self):
        return self.__pf


class ProjFileSaver(XMLWriter):

    def __init__(self, pf):
        XMLWriter.__init__(self)
        self.__pf = pf

    def write(self, file_or_filename):
        XMLWriter.write(self, file_or_filename)

        self.write_header("projfile", "projfile.dtd")
        self.write_projfile(self.__pf)
        self.close()

    def write_projfile(self, pf):

        self.open_element("projectionlist")

        for p in pf.GetProjections():
            self.open_element("projection", {"name": p.GetName()})

            for param in p.GetAllParameters():
                self.write_element("parameter", {"value": param})

            self.close_element("projection")

        self.close_element("projectionlist")


1	jonathan	696	# Copyright (c) 2003 by Intevation GmbH
2			# Authors:
3			# Jonathan Coles <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			import os
9			import Thuban
10	jonathan	875	from Thuban import _
11
12	jonathan	709	from Thuban.Model.load import XMLReader
13			from Thuban.Model.save import XMLWriter
14	jonathan	696	from Thuban.Model.proj import Projection, ProjFile
15	jonathan	727	from xml.sax import SAXParseException
16	jonathan	696
17			projdir = \
18			os.path.join(Thuban.__path__[0], os.pardir, "Resources", "Projections")
19
20			usrdir = os.path.expanduser("~/.thuban")
21
22			PROJ_EXT = ".proj"
23
24			def ReadProjFile(filename):
25	jonathan	718	"""Read a single .proj file and return a ProjFile object.
26
27			Raises IOError if the file cannot be opened.
28			Raises OSError if the file cannot be read.
29			Raises SAXParseException if the file is not valid XML.
30			"""
31	jonathan	696
32	jonathan	718	handler = ProjFileReader()
33			handler.read(filename)
34			return handler.GetProjFile()
35	jonathan	696
36			def WriteProjFile(pf):
37	jonathan	727	"""Write a single .proj file
38
39			Raises IOError if the file cannot be written.
40			"""
41
42	jonathan	696	saver = ProjFileSaver(pf)
43	jonathan	739	saver.write(pf.GetFilename())
44	jonathan	696
45	jonathan	709	def GetProjFiles(dir):
46	jonathan	696	"""Read all .proj files in the given directory and
47			return a list of ProjFile objects.
48			"""
49
50			list = []
51			try:
52	jonathan	718	dirlist = os.listdir(dir)
53	jonathan	696	except OSError:
54	jonathan	718	pass # if we can't get a directory listing just return []
55			else:
56			for file in filter(lambda s: s.endswith(PROJ_EXT), dirlist):
57			try:
58			filename = os.path.join(dir, file)
59			list.append(ReadProjFile(filename))
60			except (OSError, IOError, SAXParseException):
61			pass # just move onto the next file
62	jonathan	696
63			return list
64
65	jonathan	709	def GetSystemProjFiles():
66	jonathan	696	"""Return a list of ProjFile objects from files that are
67			supplied by Thuban.
68	jonathan	727
69			If no files could not be opened return a list with one
70			empty projection file set to store data in the default file.
71	jonathan	696	"""
72	jonathan	727	filename = os.path.join(projdir, "defaults.proj")
73			try:
74			return [ReadProjFile(filename)]
75			except (OSError, IOError, SAXParseException):
76			return [ProjFile(filename)]
77	jonathan	696
78	jonathan	709	def GetUserProjFiles():
79	jonathan	727	"""Return a list of ProjFile objects from files that are user-defined.
80	jonathan	696
81	jonathan	727	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
85			filename = os.path.join(usrdir, "user.proj")
86			try:
87			return [ReadProjFile(filename)]
88			except (OSError, IOError, SAXParseException):
89			return [ProjFile(filename)]
90
91	jonathan	709	class ProjFileReader(XMLReader):
92	jonathan	696
93	jonathan	709	def __init__(self):
94			XMLReader.__init__(self)
95			self.__pf = ProjFile("")
96
97			XMLReader.AddDispatchers(self,
98			{'projection': ("start_projection", "end_projection"),
99			'parameter': ("start_parameter", None)})
100
101			def read(self, file_or_filename):
102			XMLReader.read(self, file_or_filename)
103
104	jonathan	739	self.__pf.SetFilename(XMLReader.GetFilename(self))
105	jonathan	696
106			def start_projection(self, name, qname, attrs):
107			self.params = []
108	jonathan	875	self.name = self.encode(attrs.get((None, 'name'), _("Unknown")))
109	jonathan	696
110			def end_projection(self, name, qname):
111	jonathan	709	self.__pf.Add(Projection(self.params, self.name))
112	jonathan	696
113			def start_parameter(self, name, qname, attrs):
114			s = attrs.get((None, 'value'))
115			s = str(s) # we can't handle unicode in proj
116			self.params.append(s)
117
118			def GetProjFile(self):
119	jonathan	709	return self.__pf
120	jonathan	696
121
122	jonathan	709	class ProjFileSaver(XMLWriter):
123	jonathan	696
124			def __init__(self, pf):
125	jonathan	709	XMLWriter.__init__(self)
126			self.__pf = pf
127	jonathan	696
128			def write(self, file_or_filename):
129	jonathan	709	XMLWriter.write(self, file_or_filename)
130	jonathan	696
131	jonathan	875	self.write_header("projfile", "projfile.dtd")
132	jonathan	709	self.write_projfile(self.__pf)
133	jonathan	696	self.close()
134
135			def write_projfile(self, pf):
136
137			self.open_element("projectionlist")
138
139			for p in pf.GetProjections():
140			self.open_element("projection", {"name": p.GetName()})
141
142	jonathan	709	for param in p.GetAllParameters():
143	jonathan	696	self.write_element("parameter", {"value": param})
144
145			self.close_element("projection")
146
147			self.close_element("projectionlist")
148
149
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