Thuban/Model/load.py

# Copyright (C) 2001, 2002, 2003 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <[email protected]>
# Bernhard Herzog <[email protected]>
# Jonathan Coles <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with GRASS for details.

"""
Parser for thuban session files.
"""

__version__ = "$Revision$"

import string, os

import xml.sax
import xml.sax.handler
from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException

from Thuban import _
from Thuban.common import *

from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
     FIELDTYPE_STRING

from Thuban.Model.session import Session
from Thuban.Model.map import Map
from Thuban.Model.layer import Layer
from Thuban.Model.color import Color
from Thuban.Model.proj import Projection
from Thuban.Model.classification import Classification, \
    ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
    ClassGroupProperties


def parse_color(color):
    """Return the color object for the string color.

    Color may be either 'None' or of the form '#RRGGBB' in the usual
    HTML color notation
    """
    color = string.strip(color)
    if color == "None":
        result = Color.Transparent
    elif color[0] == '#':
        if len(color) == 7:
            r = string.atoi(color[1:3], 16) / 255.0
            g = string.atoi(color[3:5], 16) / 255.0
            b = string.atoi(color[5:7], 16) / 255.0
            result = Color(r, g, b)
        else:
            raise ValueError(_("Invalid hexadecimal color specification %s")
                             % color)
    else:
        raise ValueError(_("Invalid color specification %s") % color)
    return result


class XMLReader(xml.sax.handler.ContentHandler):

    # Dictionary mapping element names (or (URI, element name) pairs for
    # documents using namespaces) to method names. The methods should
    # accept the same parameters as the startElement (or startElementNS)
    # methods. The start_dispatcher is used by the default startElement
    # and startElementNS methods to call a method for the open tag of an
    # element.
    start_dispatcher = {}

    # end_dispatcher works just like start_dispatcher but it's used by
    # endElement and endElementNS. The method whose names it maps to
    # should accept the same parameters as endElement and endElementNS.
    end_dispatcher = {}


    def __init__(self):
        self.chars = ''
        self.__parser = None
        self.__directory = ""
        self.__dispatchers = {}

    def read(self, file_or_filename):

        if hasattr(file_or_filename, "read"):
            # it's a file object
            self.__directory = ""
            self.__file = file_or_filename
        else:
            filename = file_or_filename
            self.__directory = os.path.dirname(filename)
            self.__file = open(filename)

        if self.__parser is None:
            self.__parser = make_parser()
            self.__parser.setContentHandler(self)
            self.__parser.setErrorHandler(ErrorHandler())
            self.__parser.setFeature(xml.sax.handler.feature_namespaces, 1)

            #
            # Well, this isn't pretty, but it appears that if you
            # use Python 2.2 without the site-package _xmlplus then
            # the following will fail, and without them it will work.
            # However, if you do have the site-package and you don't
            # call these functions, the reader raises an exception
            #
            # The reason we set these to 0 in the first place is 
            # because there is an unresolved issue with external
            # entities causing an exception in the reader
            #
            try:
                self.__parser.setFeature(xml.sax.handler.feature_validation,0)
                self.__parser.setFeature(xml.sax.handler.feature_external_ges,0)
                self.__parser.setFeature(xml.sax.handler.feature_external_pes,0)
            except SAXNotRecognizedException:
                pass

        self.__parser.parse(self.__file)

        self.close()

    def close(self):
        self.__file.close()
        
    def GetFilename(self):
        if hasattr(self.__file, "name"):
            return self.__file.name

        return ""

    def GetDirectory(self):
        return self.__directory


    def AddDispatchers(self, dict):
        """Add the function names that should be used to process XML tags.

        dict -- a dictionary whose keys are XML tag strings and whose values
                are pairs of strings such that the first string is
                the name of the function that should be called when the
                XML tag opens and the second string is the name of the
                function that should be called when the XML tag closes.
                If a pair element is None, no function is called.
        """

        self.__dispatchers.update(dict)

    def startElementNS(self, name, qname, attrs):
        """Call the method given for name in self.start_dispatcher
        """
        if name[0] is None:
            method_name = self.__dispatchers.get(name[1])
        else:
            # Dispatch with namespace
            method_name = self.__dispatchers.get(name)
        if method_name is not None and method_name[0] is not None:
            getattr(self, method_name[0])(name, qname, attrs)

    def endElementNS(self, name, qname):
        """Call the method given for name in self.end_dispatcher
        """
        if name[0] is None:
            method_name = self.__dispatchers.get(name[1])
        else:
            # Dispatch with namespace
            method_name = self.__dispatchers.get(name)
        if method_name is not None and method_name[1] is not None:
            getattr(self, method_name[1])(name, qname)

class SessionLoader(XMLReader):

    def __init__(self):
        """Inititialize the Sax handler."""
        XMLReader.__init__(self)

        self.theSession = None
        self.aMap = None
        self.aLayer = None

        XMLReader.AddDispatchers(self,
            {'session'       : ("start_session",        "end_session"),
             'map'           : ("start_map",            "end_map"),
             'projection'    : ("start_projection",     "end_projection"),
             'parameter'     : ("start_parameter",      None),
             'layer'         : ("start_layer",          "end_layer"),
             'classification': ("start_classification", "end_classification"),
             'clnull'        : ("start_clnull",         "end_clnull"),
             'clpoint'       : ("start_clpoint",        "end_clpoint"),
             'clrange'       : ("start_clrange",        "end_clrange"),
             'cldata'        : ("start_cldata",         "end_cldata"),
             'table'         : ("start_table",          "end_table"),
             'labellayer'    : ("start_labellayer",     None),
             'label'         : ("start_label",          None)})

    def start_session(self, name, qname, attrs):
        self.theSession = Session(attrs.get((None, 'title'), None))

    def end_session(self, name, qname):
        pass

    def start_map(self, name, qname, attrs):
        """Start a map."""
        self.aMap = Map(attrs.get((None, 'title'), None))
        self.__projReceiver = self.aMap

    def end_map(self, name, qname):
        self.theSession.AddMap(self.aMap)
        self.__projReceiver = None

    def start_projection(self, name, qname, attrs):
        self.ProjectionParams = [ ]

    def end_projection(self, name, qname):
        self.__projReceiver.SetProjection(Projection(self.ProjectionParams))

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

    def start_layer(self, name, qname, attrs, layer_class = Layer):
        """Start a layer

        Instantiate a layer of class layer_class from the attributes in
        attrs which may be a dictionary as well as the normal SAX attrs
        object and bind it to self.aLayer.
        """
        title = attrs.get((None, 'title'), "")
        filename = attrs.get((None, 'filename'), "")
        filename = os.path.join(self.GetDirectory(), filename)
        fill = parse_color(attrs.get((None, 'fill'), "None"))
        stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
        stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
        self.aLayer = layer_class(title,
                                  self.theSession.OpenShapefile(filename),
                                  fill = fill, stroke = stroke,
                                  lineWidth = stroke_width)

        self.__projReceiver = self.aLayer

    def end_layer(self, name, qname):
        self.aMap.AddLayer(self.aLayer)
        self.__projReceiver = None

    def start_classification(self, name, qname, attrs):
        field = attrs.get((None, 'field'), None)

        fieldType = attrs.get((None, 'field_type'), None)
        dbFieldType = self.aLayer.GetFieldType(field)

        if fieldType != dbFieldType:
            raise ValueError(_("xml field type differs from database!"))

        # setup conversion routines depending on the kind of data
        # we will be seeing later on
        if fieldType == FIELDTYPE_STRING:
            self.conv = str
        elif fieldType == FIELDTYPE_INT:
            self.conv = lambda p: int(float(p))
        elif fieldType == FIELDTYPE_DOUBLE:
            self.conv = float

        self.aLayer.GetClassification().SetField(field)


    def end_classification(self, name, qname): 
        pass

    def start_clnull(self, name, qname, attrs):
        self.cl_group = ClassGroupDefault()
        self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
        self.cl_prop = ClassGroupProperties()

    def end_clnull(self, name, qname):
        self.cl_group.SetProperties(self.cl_prop)
        self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
        del self.cl_group, self.cl_prop

    def start_clpoint(self, name, qname, attrs):
        attrib_value = attrs.get((None, 'value'), "0")

        #try:
            #value  = Str2Num(attrib_value)
        #except:
            #value  = attrib_value

        value = self.conv(attrib_value)

        self.cl_group = ClassGroupSingleton(value)
        self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
        self.cl_prop = ClassGroupProperties()


    def end_clpoint(self, name, qname):
        self.cl_group.SetProperties(self.cl_prop)
        self.aLayer.GetClassification().AppendGroup(self.cl_group)
        del self.cl_group, self.cl_prop

    def start_clrange(self, name, qname, attrs):

        try:
            min = self.conv(attrs.get((None, 'min'), "0"))
            max = self.conv(attrs.get((None, 'max'), "0"))
            #min = Str2Num(attrs.get((None, 'min'), "0"))
            #max = Str2Num(attrs.get((None, 'max'), "0"))
        except ValueError:
            raise ValueError(_("Classification range is not a number!"))

        self.cl_group = ClassGroupRange(min, max)
        self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
        self.cl_prop = ClassGroupProperties()


    def end_clrange(self, name, qname):
        self.cl_group.SetProperties(self.cl_prop)
        self.aLayer.GetClassification().AppendGroup(self.cl_group)
        del self.cl_group, self.cl_prop

    def start_cldata(self, name, qname, attrs):
        self.cl_prop.SetLineColor(
            parse_color(attrs.get((None, 'stroke'), "None")))
        self.cl_prop.SetLineWidth(
            int(attrs.get((None, 'stroke_width'), "0")))
        self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))

    def end_cldata(self, name, qname):
        pass

    def start_table(self, name, qname, attrs):
        #print "table title: %s" % attrs.get('title', None)
        pass

    def end_table(self, name, qname):
        pass

    def start_labellayer(self, name, qname, attrs):
        self.aLayer = self.aMap.LabelLayer()

    def start_label(self, name, qname, attrs):
        x = float(attrs[(None, 'x')])
        y = float(attrs[(None, 'y')])
        text = attrs[(None, 'text')]
        halign = attrs[(None, 'halign')]
        valign = attrs[(None, 'valign')]
        self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)

    def characters(self, chars):
        pass


def load_session(filename):
    """Load a Thuban session from the file object file"""

    handler = SessionLoader()
    handler.read(filename)

    session = handler.theSession
    # Newly loaded session aren't modified
    session.UnsetModified()

    return session

1	bh	723	# Copyright (C) 2001, 2002, 2003 by Intevation GmbH
2	bh	6	# Authors:
3			# Jan-Oliver Wagner <[email protected]>
4	bh	267	# Bernhard Herzog <[email protected]>
5	jonathan	413	# Jonathan Coles <[email protected]>
6	bh	6	#
7			# This program is free software under the GPL (>=v2)
8			# Read the file COPYING coming with GRASS for details.
9
10			"""
11			Parser for thuban session files.
12			"""
13
14			__version__ = "$Revision$"
15
16	bh	723	import string, os
17	bh	267
18			import xml.sax
19			import xml.sax.handler
20	jonathan	526	from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21	bh	267
22	jan	374	from Thuban import _
23	jonathan	413	from Thuban.common import *
24
25	jonathan	473	from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
26			FIELDTYPE_STRING
27
28	bh	6	from Thuban.Model.session import Session
29			from Thuban.Model.map import Map
30			from Thuban.Model.layer import Layer
31			from Thuban.Model.color import Color
32			from Thuban.Model.proj import Projection
33	jonathan	413	from Thuban.Model.classification import Classification, \
34	jonathan	439	ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
35			ClassGroupProperties
36	bh	6
37
38	bh	267	def parse_color(color):
39			"""Return the color object for the string color.
40	bh	6
41	bh	267	Color may be either 'None' or of the form '#RRGGBB' in the usual
42			HTML color notation
43	bh	6	"""
44			color = string.strip(color)
45			if color == "None":
46	jonathan	610	result = Color.Transparent
47	bh	6	elif color[0] == '#':
48			if len(color) == 7:
49			r = string.atoi(color[1:3], 16) / 255.0
50			g = string.atoi(color[3:5], 16) / 255.0
51			b = string.atoi(color[5:7], 16) / 255.0
52			result = Color(r, g, b)
53			else:
54	jan	374	raise ValueError(_("Invalid hexadecimal color specification %s")
55	bh	6	% color)
56			else:
57	jan	374	raise ValueError(_("Invalid color specification %s") % color)
58	bh	6	return result
59
60
61	jonathan	706	class XMLReader(xml.sax.handler.ContentHandler):
62	bh	6
63	bh	267	# Dictionary mapping element names (or (URI, element name) pairs for
64	jonathan	365	# documents using namespaces) to method names. The methods should
65	bh	267	# accept the same parameters as the startElement (or startElementNS)
66			# methods. The start_dispatcher is used by the default startElement
67			# and startElementNS methods to call a method for the open tag of an
68			# element.
69			start_dispatcher = {}
70
71			# end_dispatcher works just like start_dispatcher but it's used by
72			# endElement and endElementNS. The method whose names it maps to
73			# should accept the same parameters as endElement and endElementNS.
74			end_dispatcher = {}
75
76
77	jonathan	706	def __init__(self):
78	bh	6	self.chars = ''
79	jonathan	706	self.__parser = None
80			self.__directory = ""
81			self.__dispatchers = {}
82	bh	6
83	jonathan	706	def read(self, file_or_filename):
84
85	jonathan	722	if hasattr(file_or_filename, "read"):
86	jonathan	706	# it's a file object
87			self.__directory = ""
88			self.__file = file_or_filename
89			else:
90			filename = file_or_filename
91			self.__directory = os.path.dirname(filename)
92			self.__file = open(filename)
93
94			if self.__parser is None:
95			self.__parser = make_parser()
96			self.__parser.setContentHandler(self)
97			self.__parser.setErrorHandler(ErrorHandler())
98			self.__parser.setFeature(xml.sax.handler.feature_namespaces, 1)
99
100			#
101			# Well, this isn't pretty, but it appears that if you
102			# use Python 2.2 without the site-package _xmlplus then
103			# the following will fail, and without them it will work.
104			# However, if you do have the site-package and you don't
105			# call these functions, the reader raises an exception
106			#
107			# The reason we set these to 0 in the first place is
108			# because there is an unresolved issue with external
109			# entities causing an exception in the reader
110			#
111			try:
112			self.__parser.setFeature(xml.sax.handler.feature_validation,0)
113			self.__parser.setFeature(xml.sax.handler.feature_external_ges,0)
114			self.__parser.setFeature(xml.sax.handler.feature_external_pes,0)
115			except SAXNotRecognizedException:
116			pass
117
118			self.__parser.parse(self.__file)
119
120			self.close()
121
122			def close(self):
123			self.__file.close()
124
125	jonathan	737	def GetFilename(self):
126	jonathan	706	if hasattr(self.__file, "name"):
127			return self.__file.name
128
129			return ""
130
131			def GetDirectory(self):
132			return self.__directory
133
134
135			def AddDispatchers(self, dict):
136	jonathan	722	"""Add the function names that should be used to process XML tags.
137
138			dict -- a dictionary whose keys are XML tag strings and whose values
139			are pairs of strings such that the first string is
140			the name of the function that should be called when the
141			XML tag opens and the second string is the name of the
142			function that should be called when the XML tag closes.
143			If a pair element is None, no function is called.
144			"""
145
146	jonathan	706	self.__dispatchers.update(dict)
147
148	bh	267	def startElementNS(self, name, qname, attrs):
149			"""Call the method given for name in self.start_dispatcher
150			"""
151			if name[0] is None:
152	jonathan	706	method_name = self.__dispatchers.get(name[1])
153	bh	267	else:
154			# Dispatch with namespace
155	jonathan	706	method_name = self.__dispatchers.get(name)
156	jonathan	722	if method_name is not None and method_name[0] is not None:
157	jonathan	706	getattr(self, method_name[0])(name, qname, attrs)
158	bh	6
159	bh	267	def endElementNS(self, name, qname):
160			"""Call the method given for name in self.end_dispatcher
161			"""
162			if name[0] is None:
163	jonathan	706	method_name = self.__dispatchers.get(name[1])
164	bh	267	else:
165			# Dispatch with namespace
166	jonathan	706	method_name = self.__dispatchers.get(name)
167	jonathan	722	if method_name is not None and method_name[1] is not None:
168	jonathan	706	getattr(self, method_name[1])(name, qname)
169	bh	6
170	jonathan	706	class SessionLoader(XMLReader):
171	jonathan	694
172	jonathan	706	def __init__(self):
173	jonathan	694	"""Inititialize the Sax handler."""
174	jonathan	706	XMLReader.__init__(self)
175	jonathan	694
176			self.theSession = None
177			self.aMap = None
178			self.aLayer = None
179
180	jonathan	706	XMLReader.AddDispatchers(self,
181			{'session' : ("start_session", "end_session"),
182			'map' : ("start_map", "end_map"),
183			'projection' : ("start_projection", "end_projection"),
184			'parameter' : ("start_parameter", None),
185			'layer' : ("start_layer", "end_layer"),
186			'classification': ("start_classification", "end_classification"),
187			'clnull' : ("start_clnull", "end_clnull"),
188			'clpoint' : ("start_clpoint", "end_clpoint"),
189			'clrange' : ("start_clrange", "end_clrange"),
190			'cldata' : ("start_cldata", "end_cldata"),
191			'table' : ("start_table", "end_table"),
192			'labellayer' : ("start_labellayer", None),
193			'label' : ("start_label", None)})
194
195	bh	267	def start_session(self, name, qname, attrs):
196			self.theSession = Session(attrs.get((None, 'title'), None))
197	bh	6
198	bh	267	def end_session(self, name, qname):
199			pass
200	bh	6
201	bh	267	def start_map(self, name, qname, attrs):
202			"""Start a map."""
203			self.aMap = Map(attrs.get((None, 'title'), None))
204	jonathan	737	self.__projReceiver = self.aMap
205	bh	267
206			def end_map(self, name, qname):
207			self.theSession.AddMap(self.aMap)
208	jonathan	737	self.__projReceiver = None
209	bh	267
210			def start_projection(self, name, qname, attrs):
211			self.ProjectionParams = [ ]
212
213			def end_projection(self, name, qname):
214	jonathan	737	self.__projReceiver.SetProjection(Projection(self.ProjectionParams))
215	bh	267
216			def start_parameter(self, name, qname, attrs):
217			s = attrs.get((None, 'value'))
218			s = str(s) # we can't handle unicode in proj
219			self.ProjectionParams.append(s)
220
221			def start_layer(self, name, qname, attrs, layer_class = Layer):
222			"""Start a layer
223
224			Instantiate a layer of class layer_class from the attributes in
225			attrs which may be a dictionary as well as the normal SAX attrs
226			object and bind it to self.aLayer.
227			"""
228			title = attrs.get((None, 'title'), "")
229			filename = attrs.get((None, 'filename'), "")
230	jonathan	694	filename = os.path.join(self.GetDirectory(), filename)
231	bh	267	fill = parse_color(attrs.get((None, 'fill'), "None"))
232			stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
233			stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
234	bh	723	self.aLayer = layer_class(title,
235			self.theSession.OpenShapefile(filename),
236			fill = fill, stroke = stroke,
237			lineWidth = stroke_width)
238	bh	267
239	jonathan	737	self.__projReceiver = self.aLayer
240
241	bh	267	def end_layer(self, name, qname):
242			self.aMap.AddLayer(self.aLayer)
243	jonathan	737	self.__projReceiver = None
244	bh	267
245	jonathan	365	def start_classification(self, name, qname, attrs):
246	jonathan	465	field = attrs.get((None, 'field'), None)
247
248			fieldType = attrs.get((None, 'field_type'), None)
249			dbFieldType = self.aLayer.GetFieldType(field)
250
251			if fieldType != dbFieldType:
252			raise ValueError(_("xml field type differs from database!"))
253
254			# setup conversion routines depending on the kind of data
255			# we will be seeing later on
256			if fieldType == FIELDTYPE_STRING:
257			self.conv = str
258			elif fieldType == FIELDTYPE_INT:
259			self.conv = lambda p: int(float(p))
260			elif fieldType == FIELDTYPE_DOUBLE:
261			self.conv = float
262
263			self.aLayer.GetClassification().SetField(field)
264
265	jonathan	365
266			def end_classification(self, name, qname):
267			pass
268
269			def start_clnull(self, name, qname, attrs):
270	jonathan	439	self.cl_group = ClassGroupDefault()
271			self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
272			self.cl_prop = ClassGroupProperties()
273	jonathan	365
274			def end_clnull(self, name, qname):
275	jonathan	439	self.cl_group.SetProperties(self.cl_prop)
276			self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
277			del self.cl_group, self.cl_prop
278	jonathan	365
279			def start_clpoint(self, name, qname, attrs):
280			attrib_value = attrs.get((None, 'value'), "0")
281
282	jonathan	465	#try:
283			#value = Str2Num(attrib_value)
284			#except:
285			#value = attrib_value
286	jonathan	365
287	jonathan	465	value = self.conv(attrib_value)
288
289	jonathan	439	self.cl_group = ClassGroupSingleton(value)
290			self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
291			self.cl_prop = ClassGroupProperties()
292	jonathan	413
293	jonathan	365
294			def end_clpoint(self, name, qname):
295	jonathan	439	self.cl_group.SetProperties(self.cl_prop)
296	jonathan	614	self.aLayer.GetClassification().AppendGroup(self.cl_group)
297	jonathan	439	del self.cl_group, self.cl_prop
298	jonathan	365
299			def start_clrange(self, name, qname, attrs):
300
301			try:
302	jonathan	465	min = self.conv(attrs.get((None, 'min'), "0"))
303			max = self.conv(attrs.get((None, 'max'), "0"))
304			#min = Str2Num(attrs.get((None, 'min'), "0"))
305			#max = Str2Num(attrs.get((None, 'max'), "0"))
306	jonathan	365	except ValueError:
307	jan	374	raise ValueError(_("Classification range is not a number!"))
308	jonathan	365
309	jonathan	439	self.cl_group = ClassGroupRange(min, max)
310			self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
311			self.cl_prop = ClassGroupProperties()
312	jonathan	413
313	jonathan	365
314			def end_clrange(self, name, qname):
315	jonathan	439	self.cl_group.SetProperties(self.cl_prop)
316	jonathan	614	self.aLayer.GetClassification().AppendGroup(self.cl_group)
317	jonathan	439	del self.cl_group, self.cl_prop
318	jonathan	365
319			def start_cldata(self, name, qname, attrs):
320	jonathan	465	self.cl_prop.SetLineColor(
321			parse_color(attrs.get((None, 'stroke'), "None")))
322			self.cl_prop.SetLineWidth(
323	jonathan	390	int(attrs.get((None, 'stroke_width'), "0")))
324	jonathan	439	self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
325	jonathan	365
326			def end_cldata(self, name, qname):
327			pass
328
329	bh	267	def start_table(self, name, qname, attrs):
330	jonathan	493	#print "table title: %s" % attrs.get('title', None)
331			pass
332	bh	267
333			def end_table(self, name, qname):
334			pass
335
336			def start_labellayer(self, name, qname, attrs):
337			self.aLayer = self.aMap.LabelLayer()
338
339			def start_label(self, name, qname, attrs):
340			x = float(attrs[(None, 'x')])
341			y = float(attrs[(None, 'y')])
342			text = attrs[(None, 'text')]
343			halign = attrs[(None, 'halign')]
344			valign = attrs[(None, 'valign')]
345			self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
346
347			def characters(self, chars):
348			pass
349
350
351	jonathan	694	def load_session(filename):
352			"""Load a Thuban session from the file object file"""
353
354	jonathan	706	handler = SessionLoader()
355			handler.read(filename)
356	jonathan	694
357	bh	6	session = handler.theSession
358			# Newly loaded session aren't modified
359			session.UnsetModified()
360
361			return session
362
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