Thuban/Model/save.py

# Copyright (c) 2001-2004 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <[email protected]> (2004)
# Bernhard Herzog <[email protected]> (2001-2004)
# Jonathan Coles <[email protected]> (2003)
# Frank Koormann <[email protected]> (2003)
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

"""
Functions to save a session to a file
"""

__version__ = "$Revision$"
# $Source$
# $Id$

import os

import Thuban.Lib.fileutil

from Thuban.Model.layer import Layer, RasterLayer

from Thuban.Model.classification import \
    ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
from Thuban.Model.data import DerivedShapeStore, ShapefileStore, \
                              SHAPETYPE_POINT

from Thuban.Model.xmlwriter import XMLWriter
from postgisdb import PostGISConnection, PostGISShapeStore

def relative_filename(dir, filename):
    """Return a filename relative to dir for the absolute file name absname.

    This is almost the same as the function in fileutil, except that dir
    can be an empty string in which case filename will be returned
    unchanged.
    """
    if dir:
        return Thuban.Lib.fileutil.relative_filename(dir, filename)
    else:
        return filename


def unify_filename(filename):
    """Return a 'unified' version of filename

    The .thuban files should be as platform independent as possible.
    Since they must contain filenames the filenames have to unified. We
    unify on unix-like filenames for now, which means we do nothing on a
    posix system and simply replace backslashes with slashes on windows
    """
    if os.name == "posix":
        return filename
    elif os.name == "nt":
        return "/".join(filename.split("\\"))
    else:
        raise RuntimeError("Unsupported platform for unify_filename: %s"
                           % os.name)

def sort_data_stores(stores):
    """Return a topologically sorted version of the sequence of data containers

    The list is sorted so that data containers that depend on other data
    containers have higher indexes than the containers they depend on.
    """
    if not stores:
        return []
    processed = {}
    result = []
    todo = stores[:]
    while todo:
        # It doesn't really matter which if the items of todo is
        # processed next, but if we take the first one, the order is
        # preserved to some degree which makes writing some of the test
        # cases easier.
        container = todo.pop(0)
        if id(container) in processed:
            continue
        deps = [dep for dep in container.Dependencies()
                    if id(dep) not in processed]
        if deps:
            todo.append(container)
            todo.extend(deps)
        else:
            result.append(container)
            processed[id(container)] = 1
    return result


class SessionSaver(XMLWriter):

    """Class to serialize a session into an XML file.

    Applications built on top of Thuban may derive from this class and
    override or extend the methods to save additional information. This
    additional information should take the form of additional attributes
    or elements whose names are prefixed with a namespace. To define a
    namespace derived classes should extend the write_session method to
    pass the namespaces to the default implementation.
    """


    def __init__(self, session):
        XMLWriter.__init__(self)
        self.session = session
        # Map object ids to the ids used in the thuban files
        self.idmap = {}

    def get_id(self, obj):
        """Return the id used in the thuban file for the object obj"""
        return self.idmap.get(id(obj))

    def define_id(self, obj, value = None):
        if value is None:
            value = "D" + str(id(obj))
        self.idmap[id(obj)] = value
        return value

    def has_id(self, obj):
        return self.idmap.has_key(id(obj))

    def prepare_filename(self, filename):
        """Return the string to use when writing filename to the thuban file

        The returned string is a unified version (only slashes as
        directory separators, see unify_filename) of filename expressed
        relative to the directory the .thuban file is written to.
        """
        return unify_filename(relative_filename(self.dir, filename))

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

        self.write_header("session", "thuban-1.1.dtd")
        self.write_session(self.session)
        self.close()

    def write_session(self, session, attrs = None, namespaces = ()):
        """Write the session and its contents

        By default, write a session element with the title attribute and
        call write_map for each map contained in the session.

        The optional argument attrs is for additional attributes and, if
        given, should be a mapping from attribute names to attribute
        values. The values should not be XML-escaped yet.

        The optional argument namespaces, if given, should be a sequence
        of (name, URI) pairs. The namespaces are written as namespace
        attributes into the session element. This is mainly useful for
        derived classes that need to store additional information in a
        thuban session file.
        """
        if attrs is None:
            attrs = {}
        attrs["title"] = session.title
        for name, uri in namespaces:
            attrs["xmlns:" + name] = uri
        # default name space
        attrs["xmlns"] = \
               "http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
        self.open_element("session", attrs)
        self.write_db_connections(session)
        self.write_data_containers(session)
        for map in session.Maps():
            self.write_map(map)
        self.close_element("session")

    def write_db_connections(self, session):
        for conn in session.DBConnections():
            if isinstance(conn, PostGISConnection):
                self.write_element("dbconnection",
                                   {"id": self.define_id(conn),
                                    "dbtype": "postgis",
                                    "host": conn.host,
                                    "port": conn.port,
                                    "user": conn.user,
                                    "dbname": conn.dbname})
            else:
                raise ValueError("Can't handle db connection %r" % conn)

    def write_data_containers(self, session):
        containers = sort_data_stores(session.DataContainers())
        for container in containers:
            if isinstance(container, AutoTransientTable):
                # AutoTransientTable instances are invisible in the
                # thuban files. They're only used internally. To make
                # sure that containers depending on AutoTransientTable
                # instances refer to the right real containers we give
                # the AutoTransientTable instances the same id as the
                # source they depend on.
                self.define_id(container,
                               self.get_id(container.Dependencies()[0]))
                continue

            idvalue = self.define_id(container)
            if isinstance(container, ShapefileStore):
                self.define_id(container.Table(), idvalue)
                filename = self.prepare_filename(container.FileName())
                self.write_element("fileshapesource",
                                   {"id": idvalue, "filename": filename,
                                    "filetype": "shapefile"})
            elif isinstance(container, DerivedShapeStore):
                shapesource, table = container.Dependencies()
                self.write_element("derivedshapesource",
                                   {"id": idvalue,
                                    "shapesource": self.get_id(shapesource),
                                    "table": self.get_id(table)})
            elif isinstance(container, PostGISShapeStore):
                conn = container.DBConnection()
                self.write_element("dbshapesource",
                                   {"id": idvalue,
                                    "dbconn": self.get_id(conn),
                                    "tablename": container.TableName(),
                                    "id_column": container.IDColumn().name,
                                    "geometry_column":
                                      container.GeometryColumn().name,
                                    })
            elif isinstance(container, DBFTable):
                filename = self.prepare_filename(container.FileName())
                self.write_element("filetable",
                                   {"id": idvalue,
                                    "title": container.Title(),
                                    "filename": filename,
                                    "filetype": "DBF"})
            elif isinstance(container, TransientJoinedTable):
                left, right = container.Dependencies()
                left_field = container.left_field
                right_field = container.right_field
                self.write_element("jointable",
                                   {"id": idvalue,
                                    "title": container.Title(),
                                    "right": self.get_id(right),
                                    "rightcolumn": right_field,
                                    "left": self.get_id(left),
                                    "leftcolumn": left_field,
                                    "jointype": container.JoinType()})
            else:
                raise ValueError("Can't handle container %r" % container)


    def write_map(self, map):
        """Write the map and its contents.

        By default, write a map element element with the title
        attribute, call write_projection to write the projection
        element, call write_layer for each layer contained in the map
        and finally call write_label_layer to write the label layer.
        """
        self.open_element('map title="%s"' % self.encode(map.title))
        self.write_projection(map.projection)
        for layer in map.Layers():
            self.write_layer(layer)
        self.write_label_layer(map.LabelLayer())
        self.close_element('map')

    def write_projection(self, projection):
        """Write the projection.
        """
        if projection and len(projection.params) > 0:
            attrs = {"name": projection.GetName()}
            epsg = projection.EPSGCode()
            if epsg is not None:
                attrs["epsg"] = epsg
            self.open_element("projection", attrs)
            for param in projection.params:
                self.write_element('parameter value="%s"' % 
                                   self.encode(param))
            self.close_element("projection")

    def write_layer(self, layer, attrs = None):
        """Write the layer.

        The optional argument attrs is for additional attributes and, if
        given, should be a mapping from attribute names to attribute
        values. The values should not be XML-escaped yet.
        """

        if attrs is None:
            attrs = {}

        attrs["title"]   = layer.title
        attrs["visible"] = ("false", "true")[int(layer.Visible())]

        if isinstance(layer, Layer):
            attrs["shapestore"]   = self.get_id(layer.ShapeStore())

            lc = layer.GetClassification()
            attrs["stroke"] = lc.GetDefaultLineColor().hex()
            attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
            attrs["fill"] = lc.GetDefaultFill().hex()

            self.open_element("layer", attrs)
            self.write_projection(layer.GetProjection())
            self.write_classification(layer)
            self.close_element("layer")
        elif isinstance(layer, RasterLayer):
            attrs["filename"] = self.prepare_filename(layer.filename)
            self.open_element("rasterlayer", attrs)
            self.write_projection(layer.GetProjection())
            self.close_element("rasterlayer")

    def write_classification(self, layer, attrs = None):
        """Write Classification information."""

        if attrs is None:
            attrs = {}

        lc = layer.GetClassification()

        field = layer.GetClassificationColumn()

        #
        # there isn't a classification of anything so do nothing
        #
        if field is None: return

        attrs["field"] = field
        attrs["field_type"] = str(layer.GetFieldType(field))
        self.open_element("classification", attrs)

        for g in lc:
            if isinstance(g, ClassGroupDefault):
                open_el  = 'clnull label="%s"' % self.encode(g.GetLabel())
                close_el = 'clnull'
            elif isinstance(g, ClassGroupSingleton):
                if layer.GetFieldType(field) == FIELDTYPE_STRING:
                    value = self.encode(g.GetValue())
                else:
                    value = str(g.GetValue())
                open_el  = 'clpoint label="%s" value="%s"' \
                           % (self.encode(g.GetLabel()), value)
                close_el = 'clpoint'
            elif isinstance(g, ClassGroupRange):
                open_el  = 'clrange label="%s" range="%s"' \
                          % (self.encode(g.GetLabel()), str(g.GetRange()))
                close_el = 'clrange'
            else:
                assert False, _("Unsupported group type in classification")
                continue

            data = g.GetProperties()
            dict = {'stroke'      : data.GetLineColor().hex(),
                    'stroke_width': str(data.GetLineWidth()),
                    'fill'        : data.GetFill().hex()}

            # only for point layers write the size attribute
            if layer.ShapeType() == SHAPETYPE_POINT:
                dict['size'] =  str(data.GetSize())

            self.open_element(open_el)
            self.write_element("cldata", dict)
            self.close_element(close_el)

        self.close_element("classification")

    def write_label_layer(self, layer):
        """Write the label layer.
        """
        labels = layer.Labels()
        if labels:
            self.open_element('labellayer')
            for label in labels:
                self.write_element(('label x="%g" y="%g" text="%s"'
                                    ' halign="%s" valign="%s"')
                                % (label.x, label.y, 
                                   self.encode(label.text), 
                                   label.halign,
                                   label.valign))
            self.close_element('labellayer')


def save_session(session, file, saver_class = None):
    """Save the session session to a file.

    The file argument may either be a filename or an open file object.

    The optional argument saver_class is the class to use to serialize
    the session. By default or if it's None, the saver class will be
    SessionSaver.

    If writing the session is successful call the session's
    UnsetModified method
    """
    if saver_class is None:
        saver_class = SessionSaver
    saver = saver_class(session)
    saver.write(file)

    # after a successful save consider the session unmodified.
    session.UnsetModified()
1	jan	2383	# Copyright (c) 2001-2004 by Intevation GmbH
2	bh	6	# Authors:
3	jan	2383	# Jan-Oliver Wagner <[email protected]> (2004)
4			# Bernhard Herzog <[email protected]> (2001-2004)
5			# Jonathan Coles <[email protected]> (2003)
6			# Frank Koormann <[email protected]> (2003)
7	bh	6	#
8			# This program is free software under the GPL (>=v2)
9			# Read the file COPYING coming with Thuban for details.
10
11			"""
12			Functions to save a session to a file
13			"""
14
15			__version__ = "$Revision$"
16	jan	2384	# $Source$
17			# $Id$
18	bh	6
19			import os
20
21	bh	201	import Thuban.Lib.fileutil
22	bh	6
23	jonathan	932	from Thuban.Model.layer import Layer, RasterLayer
24
25	jonathan	876	from Thuban.Model.classification import \
26			ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
27	bh	1268	from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
28	bh	1417	from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
29	jan	2383	from Thuban.Model.data import DerivedShapeStore, ShapefileStore, \
30			SHAPETYPE_POINT
31	jonathan	429
32	jonathan	1160	from Thuban.Model.xmlwriter import XMLWriter
33	bh	1638	from postgisdb import PostGISConnection, PostGISShapeStore
34	jonathan	366
35	bh	201	def relative_filename(dir, filename):
36			"""Return a filename relative to dir for the absolute file name absname.
37
38			This is almost the same as the function in fileutil, except that dir
39			can be an empty string in which case filename will be returned
40			unchanged.
41			"""
42			if dir:
43			return Thuban.Lib.fileutil.relative_filename(dir, filename)
44			else:
45			return filename
46
47	bh	1268
48	bh	1989	def unify_filename(filename):
49			"""Return a 'unified' version of filename
50
51			The .thuban files should be as platform independent as possible.
52			Since they must contain filenames the filenames have to unified. We
53			unify on unix-like filenames for now, which means we do nothing on a
54			posix system and simply replace backslashes with slashes on windows
55			"""
56			if os.name == "posix":
57			return filename
58			elif os.name == "nt":
59			return "/".join(filename.split("\\"))
60			else:
61			raise RuntimeError("Unsupported platform for unify_filename: %s"
62			% os.name)
63
64	bh	1268	def sort_data_stores(stores):
65			"""Return a topologically sorted version of the sequence of data containers
66
67			The list is sorted so that data containers that depend on other data
68			containers have higher indexes than the containers they depend on.
69			"""
70			if not stores:
71			return []
72			processed = {}
73			result = []
74			todo = stores[:]
75			while todo:
76			# It doesn't really matter which if the items of todo is
77			# processed next, but if we take the first one, the order is
78			# preserved to some degree which makes writing some of the test
79			# cases easier.
80			container = todo.pop(0)
81			if id(container) in processed:
82			continue
83			deps = [dep for dep in container.Dependencies()
84			if id(dep) not in processed]
85			if deps:
86			todo.append(container)
87			todo.extend(deps)
88			else:
89			result.append(container)
90			processed[id(container)] = 1
91			return result
92
93
94	jonathan	710	class SessionSaver(XMLWriter):
95	bh	268
96	jonathan	697	"""Class to serialize a session into an XML file.
97
98			Applications built on top of Thuban may derive from this class and
99			override or extend the methods to save additional information. This
100			additional information should take the form of additional attributes
101			or elements whose names are prefixed with a namespace. To define a
102			namespace derived classes should extend the write_session method to
103			pass the namespaces to the default implementation.
104			"""
105
106
107			def __init__(self, session):
108	jonathan	710	XMLWriter.__init__(self)
109	jonathan	697	self.session = session
110	bh	1268	# Map object ids to the ids used in the thuban files
111			self.idmap = {}
112	jonathan	697
113	bh	1268	def get_id(self, obj):
114			"""Return the id used in the thuban file for the object obj"""
115			return self.idmap.get(id(obj))
116
117			def define_id(self, obj, value = None):
118			if value is None:
119			value = "D" + str(id(obj))
120			self.idmap[id(obj)] = value
121			return value
122
123			def has_id(self, obj):
124			return self.idmap.has_key(id(obj))
125
126	bh	1989	def prepare_filename(self, filename):
127			"""Return the string to use when writing filename to the thuban file
128
129			The returned string is a unified version (only slashes as
130			directory separators, see unify_filename) of filename expressed
131			relative to the directory the .thuban file is written to.
132			"""
133			return unify_filename(relative_filename(self.dir, filename))
134
135	jonathan	697	def write(self, file_or_filename):
136	jonathan	710	XMLWriter.write(self, file_or_filename)
137	jonathan	697
138	bh	2104	self.write_header("session", "thuban-1.1.dtd")
139	jonathan	697	self.write_session(self.session)
140			self.close()
141
142	bh	268	def write_session(self, session, attrs = None, namespaces = ()):
143			"""Write the session and its contents
144
145			By default, write a session element with the title attribute and
146			call write_map for each map contained in the session.
147
148			The optional argument attrs is for additional attributes and, if
149			given, should be a mapping from attribute names to attribute
150			values. The values should not be XML-escaped yet.
151
152			The optional argument namespaces, if given, should be a sequence
153			of (name, URI) pairs. The namespaces are written as namespace
154			attributes into the session element. This is mainly useful for
155			derived classes that need to store additional information in a
156			thuban session file.
157			"""
158			if attrs is None:
159			attrs = {}
160			attrs["title"] = session.title
161			for name, uri in namespaces:
162			attrs["xmlns:" + name] = uri
163	bh	1268	# default name space
164			attrs["xmlns"] = \
165	bh	2104	"http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
166	jonathan	366	self.open_element("session", attrs)
167	bh	1638	self.write_db_connections(session)
168	bh	1268	self.write_data_containers(session)
169	bh	268	for map in session.Maps():
170			self.write_map(map)
171	jonathan	366	self.close_element("session")
172	bh	268
173	bh	1638	def write_db_connections(self, session):
174			for conn in session.DBConnections():
175			if isinstance(conn, PostGISConnection):
176			self.write_element("dbconnection",
177			{"id": self.define_id(conn),
178			"dbtype": "postgis",
179			"host": conn.host,
180			"port": conn.port,
181			"user": conn.user,
182			"dbname": conn.dbname})
183			else:
184			raise ValueError("Can't handle db connection %r" % conn)
185
186	bh	1268	def write_data_containers(self, session):
187			containers = sort_data_stores(session.DataContainers())
188			for container in containers:
189			if isinstance(container, AutoTransientTable):
190			# AutoTransientTable instances are invisible in the
191			# thuban files. They're only used internally. To make
192			# sure that containers depending on AutoTransientTable
193			# instances refer to the right real containers we give
194			# the AutoTransientTable instances the same id as the
195			# source they depend on.
196			self.define_id(container,
197			self.get_id(container.Dependencies()[0]))
198			continue
199
200			idvalue = self.define_id(container)
201			if isinstance(container, ShapefileStore):
202			self.define_id(container.Table(), idvalue)
203	bh	1989	filename = self.prepare_filename(container.FileName())
204	bh	1268	self.write_element("fileshapesource",
205			{"id": idvalue, "filename": filename,
206			"filetype": "shapefile"})
207			elif isinstance(container, DerivedShapeStore):
208			shapesource, table = container.Dependencies()
209			self.write_element("derivedshapesource",
210			{"id": idvalue,
211			"shapesource": self.get_id(shapesource),
212			"table": self.get_id(table)})
213	bh	1638	elif isinstance(container, PostGISShapeStore):
214			conn = container.DBConnection()
215			self.write_element("dbshapesource",
216			{"id": idvalue,
217			"dbconn": self.get_id(conn),
218	bh	2104	"tablename": container.TableName(),
219			"id_column": container.IDColumn().name,
220			"geometry_column":
221			container.GeometryColumn().name,
222			})
223	bh	1268	elif isinstance(container, DBFTable):
224	bh	1989	filename = self.prepare_filename(container.FileName())
225	bh	1268	self.write_element("filetable",
226			{"id": idvalue,
227			"title": container.Title(),
228			"filename": filename,
229			"filetype": "DBF"})
230			elif isinstance(container, TransientJoinedTable):
231			left, right = container.Dependencies()
232			left_field = container.left_field
233			right_field = container.right_field
234			self.write_element("jointable",
235			{"id": idvalue,
236			"title": container.Title(),
237			"right": self.get_id(right),
238			"rightcolumn": right_field,
239			"left": self.get_id(left),
240	bh	1375	"leftcolumn": left_field,
241			"jointype": container.JoinType()})
242	bh	1268	else:
243			raise ValueError("Can't handle container %r" % container)
244
245
246	bh	268	def write_map(self, map):
247			"""Write the map and its contents.
248
249			By default, write a map element element with the title
250			attribute, call write_projection to write the projection
251			element, call write_layer for each layer contained in the map
252			and finally call write_label_layer to write the label layer.
253			"""
254	jonathan	876	self.open_element('map title="%s"' % self.encode(map.title))
255	bh	268	self.write_projection(map.projection)
256			for layer in map.Layers():
257			self.write_layer(layer)
258			self.write_label_layer(map.LabelLayer())
259	jonathan	366	self.close_element('map')
260	bh	6
261	bh	268	def write_projection(self, projection):
262			"""Write the projection.
263			"""
264			if projection and len(projection.params) > 0:
265	bh	1843	attrs = {"name": projection.GetName()}
266			epsg = projection.EPSGCode()
267			if epsg is not None:
268			attrs["epsg"] = epsg
269			self.open_element("projection", attrs)
270	bh	268	for param in projection.params:
271	jonathan	876	self.write_element('parameter value="%s"' %
272			self.encode(param))
273	jonathan	366	self.close_element("projection")
274	bh	268
275			def write_layer(self, layer, attrs = None):
276			"""Write the layer.
277
278			The optional argument attrs is for additional attributes and, if
279			given, should be a mapping from attribute names to attribute
280			values. The values should not be XML-escaped yet.
281			"""
282	jonathan	391
283	bh	268	if attrs is None:
284			attrs = {}
285	jonathan	429
286	jonathan	1251	attrs["title"] = layer.title
287			attrs["visible"] = ("false", "true")[int(layer.Visible())]
288	bh	268
289	jonathan	932	if isinstance(layer, Layer):
290	bh	1268	attrs["shapestore"] = self.get_id(layer.ShapeStore())
291	jonathan	740
292	jonathan	932	lc = layer.GetClassification()
293	bh	1268	attrs["stroke"] = lc.GetDefaultLineColor().hex()
294	jonathan	932	attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
295	bh	1268	attrs["fill"] = lc.GetDefaultFill().hex()
296	jonathan	740
297	jonathan	932	self.open_element("layer", attrs)
298			self.write_projection(layer.GetProjection())
299			self.write_classification(layer)
300			self.close_element("layer")
301			elif isinstance(layer, RasterLayer):
302	bh	1989	attrs["filename"] = self.prepare_filename(layer.filename)
303	jonathan	932	self.open_element("rasterlayer", attrs)
304			self.write_projection(layer.GetProjection())
305			self.close_element("rasterlayer")
306
307	jonathan	366	def write_classification(self, layer, attrs = None):
308	jonathan	1251	"""Write Classification information."""
309
310	jonathan	366	if attrs is None:
311			attrs = {}
312
313	jonathan	414	lc = layer.GetClassification()
314	jonathan	366
315	bh	1452	field = layer.GetClassificationColumn()
316
317	jonathan	366	#
318	jonathan	1251	# there isn't a classification of anything so do nothing
319	jonathan	366	#
320			if field is None: return
321
322			attrs["field"] = field
323	jonathan	1430	attrs["field_type"] = str(layer.GetFieldType(field))
324	jonathan	366	self.open_element("classification", attrs)
325
326	jonathan	1251	for g in lc:
327			if isinstance(g, ClassGroupDefault):
328			open_el = 'clnull label="%s"' % self.encode(g.GetLabel())
329			close_el = 'clnull'
330	bh	1417	elif isinstance(g, ClassGroupSingleton):
331	jonathan	1430	if layer.GetFieldType(field) == FIELDTYPE_STRING:
332	bh	1417	value = self.encode(g.GetValue())
333			else:
334			value = str(g.GetValue())
335	jonathan	1251	open_el = 'clpoint label="%s" value="%s"' \
336	bh	1417	% (self.encode(g.GetLabel()), value)
337	jonathan	1251	close_el = 'clpoint'
338			elif isinstance(g, ClassGroupRange):
339			open_el = 'clrange label="%s" range="%s"' \
340			% (self.encode(g.GetLabel()), str(g.GetRange()))
341			close_el = 'clrange'
342			else:
343			assert False, _("Unsupported group type in classification")
344			continue
345	jonathan	429
346	jonathan	1251	data = g.GetProperties()
347			dict = {'stroke' : data.GetLineColor().hex(),
348			'stroke_width': str(data.GetLineWidth()),
349			'fill' : data.GetFill().hex()}
350	jonathan	429
351	jan	2383	# only for point layers write the size attribute
352			if layer.ShapeType() == SHAPETYPE_POINT:
353			dict['size'] = str(data.GetSize())
354
355	jonathan	1251	self.open_element(open_el)
356			self.write_element("cldata", dict)
357			self.close_element(close_el)
358	jonathan	366
359			self.close_element("classification")
360
361	bh	268	def write_label_layer(self, layer):
362			"""Write the label layer.
363			"""
364			labels = layer.Labels()
365	bh	6	if labels:
366	jonathan	366	self.open_element('labellayer')
367	bh	6	for label in labels:
368	jonathan	366	self.write_element(('label x="%g" y="%g" text="%s"'
369			' halign="%s" valign="%s"')
370	jonathan	876	% (label.x, label.y,
371			self.encode(label.text),
372			label.halign,
373	bh	268	label.valign))
374	jonathan	366	self.close_element('labellayer')
375	bh	6
376	bh	268
377
378			def save_session(session, file, saver_class = None):
379			"""Save the session session to a file.
380
381			The file argument may either be a filename or an open file object.
382
383			The optional argument saver_class is the class to use to serialize
384			the session. By default or if it's None, the saver class will be
385	jonathan	697	SessionSaver.
386	bh	268
387			If writing the session is successful call the session's
388			UnsetModified method
389			"""
390			if saver_class is None:
391	jonathan	697	saver_class = SessionSaver
392	bh	268	saver = saver_class(session)
393			saver.write(file)
394
395	bh	6	# after a successful save consider the session unmodified.
396			session.UnsetModified()
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