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	# Copyright (c) 2001-2004 by Intevation GmbH
2	# Authors:
3	# 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	#
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	# $Source$
17	# $Id$
18
19	import os
20
21	import Thuban.Lib.fileutil
22
23	from Thuban.Model.layer import Layer, RasterLayer
24
25	from Thuban.Model.classification import \
26	ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
27	from Thuban.Model.transientdb import AutoTransientTable, TransientJoinedTable
28	from Thuban.Model.table import DBFTable, FIELDTYPE_STRING
29	from Thuban.Model.data import DerivedShapeStore, ShapefileStore, \
30	SHAPETYPE_POINT
31
32	from Thuban.Model.xmlwriter import XMLWriter
33	from postgisdb import PostGISConnection, PostGISShapeStore
34
35	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
48	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	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	class SessionSaver(XMLWriter):
95
96	"""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	XMLWriter.__init__(self)
109	self.session = session
110	# Map object ids to the ids used in the thuban files
111	self.idmap = {}
112
113	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	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	def write(self, file_or_filename):
136	XMLWriter.write(self, file_or_filename)
137
138	self.write_header("session", "thuban-1.1.dtd")
139	self.write_session(self.session)
140	self.close()
141
142	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	# default name space
164	attrs["xmlns"] = \
165	"http://thuban.intevation.org/dtds/thuban-1.1-dev.dtd"
166	self.open_element("session", attrs)
167	self.write_db_connections(session)
168	self.write_data_containers(session)
169	for map in session.Maps():
170	self.write_map(map)
171	self.close_element("session")
172
173	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	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	filename = self.prepare_filename(container.FileName())
204	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	elif isinstance(container, PostGISShapeStore):
214	conn = container.DBConnection()
215	self.write_element("dbshapesource",
216	{"id": idvalue,
217	"dbconn": self.get_id(conn),
218	"tablename": container.TableName(),
219	"id_column": container.IDColumn().name,
220	"geometry_column":
221	container.GeometryColumn().name,
222	})
223	elif isinstance(container, DBFTable):
224	filename = self.prepare_filename(container.FileName())
225	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	"leftcolumn": left_field,
241	"jointype": container.JoinType()})
242	else:
243	raise ValueError("Can't handle container %r" % container)
244
245
246	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	self.open_element('map title="%s"' % self.encode(map.title))
255	self.write_projection(map.projection)
256	for layer in map.Layers():
257	self.write_layer(layer)
258	self.write_label_layer(map.LabelLayer())
259	self.close_element('map')
260
261	def write_projection(self, projection):
262	"""Write the projection.
263	"""
264	if projection and len(projection.params) > 0:
265	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	for param in projection.params:
271	self.write_element('parameter value="%s"' %
272	self.encode(param))
273	self.close_element("projection")
274
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
283	if attrs is None:
284	attrs = {}
285
286	attrs["title"] = layer.title
287	attrs["visible"] = ("false", "true")[int(layer.Visible())]
288
289	if isinstance(layer, Layer):
290	attrs["shapestore"] = self.get_id(layer.ShapeStore())
291
292	lc = layer.GetClassification()
293	attrs["stroke"] = lc.GetDefaultLineColor().hex()
294	attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
295	attrs["fill"] = lc.GetDefaultFill().hex()
296
297	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	attrs["filename"] = self.prepare_filename(layer.filename)
303	self.open_element("rasterlayer", attrs)
304	self.write_projection(layer.GetProjection())
305	self.close_element("rasterlayer")
306
307	def write_classification(self, layer, attrs = None):
308	"""Write Classification information."""
309
310	if attrs is None:
311	attrs = {}
312
313	lc = layer.GetClassification()
314
315	field = layer.GetClassificationColumn()
316
317	#
318	# there isn't a classification of anything so do nothing
319	#
320	if field is None: return
321
322	attrs["field"] = field
323	attrs["field_type"] = str(layer.GetFieldType(field))
324	self.open_element("classification", attrs)
325
326	for g in lc:
327	if isinstance(g, ClassGroupDefault):
328	open_el = 'clnull label="%s"' % self.encode(g.GetLabel())
329	close_el = 'clnull'
330	elif isinstance(g, ClassGroupSingleton):
331	if layer.GetFieldType(field) == FIELDTYPE_STRING:
332	value = self.encode(g.GetValue())
333	else:
334	value = str(g.GetValue())
335	open_el = 'clpoint label="%s" value="%s"' \
336	% (self.encode(g.GetLabel()), value)
337	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
346	data = g.GetProperties()
347	dict = {'stroke' : data.GetLineColor().hex(),
348	'stroke_width': str(data.GetLineWidth()),
349	'fill' : data.GetFill().hex()}
350
351	# only for point layers write the size attribute
352	if layer.ShapeType() == SHAPETYPE_POINT:
353	dict['size'] = str(data.GetSize())
354
355	self.open_element(open_el)
356	self.write_element("cldata", dict)
357	self.close_element(close_el)
358
359	self.close_element("classification")
360
361	def write_label_layer(self, layer):
362	"""Write the label layer.
363	"""
364	labels = layer.Labels()
365	if labels:
366	self.open_element('labellayer')
367	for label in labels:
368	self.write_element(('label x="%g" y="%g" text="%s"'
369	' halign="%s" valign="%s"')
370	% (label.x, label.y,
371	self.encode(label.text),
372	label.halign,
373	label.valign))
374	self.close_element('labellayer')
375
376
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	SessionSaver.
386
387	If writing the session is successful call the session's
388	UnsetModified method
389	"""
390	if saver_class is None:
391	saver_class = SessionSaver
392	saver = saver_class(session)
393	saver.write(file)
394
395	# after a successful save consider the session unmodified.
396	session.UnsetModified()
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