WIP-pyshapelib-bramz/test/test_load.py

# Copyright (c) 2002, 2003 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

"""
Test loading a thuban session from a file

The tests in this file (test_load.py) are always be the tests for the
current version of the thuban file format. Tests for older versions can
be found in the version specific test modules, e.g. test_load_0_2 for
files created by Thuban 0.2.

Maintenance of the test cases:

When during a development period the file format is changed with respect
to the last released version for the first, the tests here should be
copied to the version specific test file. The round-trip tests which
save the session again and compare the XML files should not be copied
over as they only make sense here to make sure th that the files checked
here are actually ones that may have been written by the current thuban
version.
"""

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

import os
import unittest

import support
support.initthuban()

import postgissupport
from xmlsupport import sax_eventlist

import dbflib
import shapelib

from Thuban.Model.save import save_session
from Thuban.Model.load import load_session, parse_color, LoadError, \
     LoadCancelled
from Thuban.Model.color import Transparent
from Thuban.Model.classification import ClassGroupProperties, ClassGroupRange,\
    ClassGroupSingleton, ClassGroupDefault
from Thuban.Model.postgisdb import ConnectionError
from Thuban.Model.table import DBFTable, MemoryTable, \
     FIELDTYPE_DOUBLE, FIELDTYPE_INT, FIELDTYPE_STRING, \
     table_to_dbf


def filenames_equal(name1, name2):
    """Return true if the filenames name1 and name2 are equal.

    On systems where it is available, simply use os.path.samefile,
    otherwise return whether the normalized versions of the filenames
    according to os.path.normpath are equal.
    """
    if hasattr(os.path, "samefile"):
        return os.path.samefile(name1, name2)
    return os.path.normpath(name1) == os.path.normpath(name2)


class LoadSessionTest(support.FileLoadTestCase):

    """Base class for .thuban file loading tests

    Basically the same as the FileLoadTestCase, except that all tests
    use the '.thuban' extension by default and that setUp and tearDown
    handle sessions.
    """

    file_extension = ".thuban"

    def setUp(self):
        """Create the test files"""
        support.FileLoadTestCase.setUp(self)
        self.session = None

    def tearDown(self):
        if self.session is not None:
            self.session.Destroy()
        self.session = None


    dtd = "http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
    thubanids = [((dtd, n), (None, "id")) for n in
                 ["fileshapesource", "filetable", "jointable",
                  "derivedshapesource"]]
    thubanidrefs = [((dtd, n), (None, m)) for n, m in
                    [("layer", "shapestore"),
                     ("jointable", "left"),
                     ("jointable", "right"),
                     ("derivedshapesource", "table"),
                     ("derivedshapesource", "shapesource")]]
    filenames = [((dtd, n), (None, m)) for n, m in
                 [("fileshapesource", "filename"),
                  ("rasterlayer", "filename"),
                  ("filetable", "filename")]]
    del n, m, dtd

    def check_format(self):
        """Check whether the file we loaded from matches the one that
        would be written. Call this from each test case after loading
        the session
        """
        filename = self.temp_file_name(self.id() + ".roundtrip.thuban")
        save_session(self.session, filename)
        el1 = sax_eventlist(filename = filename, ids = self.thubanids,
                            idrefs = self.thubanidrefs,
                            filenames = self.filenames)
        el2 = sax_eventlist(filename = self.filename(), ids = self.thubanids,
                            idrefs = self.thubanidrefs,
                            filenames = self.filenames)
        if 0:
            for a, b in zip(el1, el2):
                print a != b and "***************" or ""
                print a
                print b
        self.assertEquals(el1, el2,
                          "loaded file not equivalent to the saved file")


class ClassificationTest(LoadSessionTest):

    """
    Base class for tests that do some detailed checking of classifications
    """

    def TestLayers(self, layers, expected):
        TITLE = 0
        NUM_GROUPS = 1
        CLASSES = 2
        GROUP_TYPE = 0
        GROUP_DATA = 1
        GROUP_LABEL = 2
        GROUP_PROPS = 3

        eq = self.assertEquals

        eq(len(layers), len(expected))

        for layer, data in zip(layers, expected):
            eq(layer.Title(), data[TITLE])

            clazz = layer.GetClassification()
            eq(clazz.GetNumGroups(), data[NUM_GROUPS])
            eq(clazz.GetNumGroups() + 1, len(data[CLASSES]))

            i = 0
            for group in clazz:
                props = ClassGroupProperties()
                props.SetLineColor(
                    parse_color(data[CLASSES][i][GROUP_PROPS][0]))
                props.SetLineWidth(data[CLASSES][i][GROUP_PROPS][1])
                props.SetFill(
                    parse_color(data[CLASSES][i][GROUP_PROPS][2]))

                if data[CLASSES][i][GROUP_TYPE] == "default":
                    g = ClassGroupDefault(props, data[CLASSES][i][GROUP_LABEL])
                elif data[CLASSES][i][GROUP_TYPE] == "range":
                    g = ClassGroupRange((data[CLASSES][i][GROUP_DATA][0],
                                         data[CLASSES][i][GROUP_DATA][1]),
                                        props, data[CLASSES][i][GROUP_LABEL])
                elif data[CLASSES][i][GROUP_TYPE] == "single":
                    g = ClassGroupSingleton(data[CLASSES][i][GROUP_DATA],
                                          props, data[CLASSES][i][GROUP_LABEL])

                eq(group, g)

                i += 1


class TestSingleLayer(LoadSessionTest):

    # Note: The use of &amp; and non-ascii characters is deliberate. We
    # want to test whether the loading code handles that correctly.
    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="Stra\xc3\x9fen &amp; Landmarken">
    <fileshapesource filetype="shapefile" id="D1"
        filename="../../Data/iceland/political.shp"/>
    <map title="\xc3\x9cbersicht">
        <projection epsg="32627" name="WGS 84 / UTM zone 27N">
            <parameter value="datum=WGS84"/>
            <parameter value="ellps=WGS84"/>
            <parameter value="proj=utm"/>
            <parameter value="units=m"/>
            <parameter value="zone=27"/>
        </projection>
        <layer shapestore="D1" visible="true"
                stroke="#000000" title="K\xc3\xbcste" stroke_width="1"
                fill="None"/>
    </map>
</session>
'''

    def test(self):
        """Load a session with a single map with a single layer"""
        eq = self.assertEquals
        session = load_session(self.filename())
        self.session = session

        # Check the title
        eq(session.Title(), "Stra\xdfen & Landmarken")

        # the session has one map.
        maps = session.Maps()
        eq(len(maps), 1)

        # Check the map's attributes
        map = maps[0]
        eq(map.Title(), "\xdcbersicht")
        proj = map.GetProjection()
        eq(proj.GetName(), "WGS 84 / UTM zone 27N")
        eq(proj.EPSGCode(), "32627")
        params = proj.GetAllParameters()
        params.sort()
        eq(params, ["datum=WGS84", "ellps=WGS84", "proj=utm", "units=m",
                    "zone=27"])

        # the map has a single layer
        layers = map.Layers()
        eq(len(layers), 1)

        # Check the layer attributes
        layer = layers[0]
        eq(layer.Title(), "K\xfcste")
        self.failUnless(filenames_equal(layer.ShapeStore().FileName(),
                                        os.path.join(self.temp_dir(),
                                                     os.pardir, os.pardir,
                                                     "Data", "iceland",
                                                     "political.shp")))
        eq(layer.GetClassification().GetDefaultFill(), Transparent)
        eq(layer.GetClassification().GetDefaultLineColor().hex(), "#000000")
        eq(layer.Visible(), True)

        self.check_format()

        self.session.Destroy()
        self.session = None

    def test_leak(self):
        """Test load_session for resource leaks

        The load_session function had a resource leak in that it created
        cyclic references. The objects would have been eventually
        collected by the garbage collector but too late. One symptom is
        that when layers are removed so that the last normal reference
        owned indirectly by the session to a shape store goes away, the
        shape store is not actually removed from the session even though
        the session only keeps weak references because there are still
        references owned by the cyclic garbage.
        """
        session = load_session(self.filename())
        self.session = session

        # sanity check
        self.assertEquals(len(session.ShapeStores()), 1)

        # remove the map. The shapestore should go away too
        session.RemoveMap(session.Maps()[0])
        self.assertEquals(len(session.ShapeStores()), 0)


class TestNonAsciiColumnName(LoadSessionTest):

    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="Non ASCII column name test">
    <fileshapesource filetype="shapefile" id="D1"
        filename="TestNonAsciiColumnName.shp"/>
    <map title="map">
        <projection name="Some Projection">
            <parameter value="datum=WGS84"/>
            <parameter value="ellps=WGS84"/>
            <parameter value="proj=utm"/>
            <parameter value="units=m"/>
            <parameter value="zone=27"/>
        </projection>
        <layer shapestore="D1" visible="true"
                stroke="#000000" title="layer" stroke_width="1"
                fill="None">
            <classification field="Fl\xc3\xa4che" field_type="double">
                <clnull label="">
                    <cldata stroke="#000000" stroke_width="1" fill="None"/>
                </clnull>
            </classification>
        </layer>
    </map>
</session>
'''

    def test(self):
        """Load a session with a single map with a single layer"""

        # Create a shapefile and a dbffile with a non-ascii column name
        dbffile = self.temp_file_name("TestNonAsciiColumnName.dbf")
        shpfile = self.temp_file_name("TestNonAsciiColumnName.shp")
        dbf = dbflib.create(dbffile)
        dbf.add_field('Fl\xe4che', dbflib.FTDouble, 10, 5)
        dbf.write_record(0, (0.0,))
        dbf.close()
        shp = shapelib.create(shpfile, shapelib.SHPT_POLYGON)
        shp.write_object(-1, shapelib.SHPObject(shapelib.SHPT_POLYGON, 1,
                                                [[(0,0), (10, 10), (10, 0),
                                                  (0, 0)]]))
        shp.close()

        try:
            session = load_session(self.filename())
        except ValueError, v:
            # Usually if the field name is not decoded properly the
            # loading fails because the field type mentioned in the file
            # is not None as returned from the layer for a non-existing
            # column name so we check for that and report it as failure.
            # Other exceptions are errors in the test case.
            if str(v) == "xml field type differs from database!":
                self.fail("Cannot load file with non-ascii column names")
            else:
                raise
        self.session = session

        # In case Thuban could load the file anyway (i.e. no ValueError
        # exception in load_session()), check explicitly whether the
        # field name was decoded properly. The test will probably lead
        # to a UnicodeError instead of a test failure so we check that
        # too
        layer = session.Maps()[0].Layers()[0]
        try:
            self.assertEquals(layer.GetClassificationColumn(), 'Fl\xe4che')
        except UnicodeError:
            # FIXME: Obviously this will have to change if Thuban ever
            # supports unicode properly.
            self.fail("Column name was not converted to a bytestring")

        # roundtrip check
        self.check_format()


class TestLayerVisibility(LoadSessionTest):

    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="single map&amp;layer">
    <fileshapesource filetype="shapefile" id="D1"
        filename="../../Data/iceland/political.shp"/>
    <map title="Test Map">
        <projection name="Unknown">
            <parameter value="zone=26"/>
            <parameter value="proj=utm"/>
            <parameter value="ellps=clrk66"/>
        </projection>
        <layer shapestore="D1" visible="false" stroke="#000000"
                title="My Layer" stroke_width="1" fill="None"/>
    </map>
</session>
'''

    def test(self):
        """Test that the visible flag is correctly loaded for a layer."""
        eq = self.assertEquals
        session = load_session(self.filename())
        self.session = session
        maps = session.Maps()
        eq(len(maps), 1)
        map = maps[0]
        layers = map.Layers()
        eq(len(layers), 1)
        layer = layers[0]

        eq(layer.Visible(), False)

        self.check_format()


class TestClassification(ClassificationTest):

    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="single map&amp;layer">
    <fileshapesource filetype="shapefile" id="D138389860"
        filename="../../Data/iceland/political.shp"/>
    <fileshapesource filetype="shapefile" id="D138504492"
        filename="../../Data/iceland/political.shp"/>
    <map title="Test Map">
        <projection name="">
            <parameter value="zone=26"/>
            <parameter value="proj=utm"/>
            <parameter value="ellps=clrk66"/>
        </projection>
        <layer shapestore="D138389860" visible="true" stroke="#000000"
                title="My Layer" stroke_width="1" fill="None">
            <classification field="POPYREG" field_type="string">
                <clnull label="">
                    <cldata stroke="#000000" stroke_width="1" fill="None"/>
                </clnull>
                <clpoint label="" value="1">
                    <cldata stroke="#000000" stroke_width="2" fill="None"/>
                </clpoint>
                <clpoint label="" value="1">
                    <cldata stroke="#000000" stroke_width="10" fill="None"/>
                </clpoint>
                <clpoint label="\xc3\x9cml\xc3\xa4uts"
                        value="\xc3\xa4\xc3\xb6\xc3\xbc">
                    <cldata stroke="#000000" stroke_width="1" fill="None"/>
                </clpoint>
            </classification>
        </layer>
        <layer shapestore="D138504492" visible="true" stroke="#000000"
                title="My Layer 2" stroke_width="2" fill="None">
            <classification field="AREA" field_type="double">
                <clnull label="">
                    <cldata stroke="#000000" stroke_width="2" fill="None"/>
                </clnull>
                <clrange label="" range="[0;1[">
                    <cldata stroke="#111111" stroke_width="1" fill="None"/>
                </clrange>
                <clpoint label="" value="0.5">
                    <cldata stroke="#000000" stroke_width="1" fill="#111111"/>
                </clpoint>
                <clrange label="" range="[-1;0[">
                    <cldata stroke="#000000" stroke_width="1" fill="None"/>
                </clrange>
                <clpoint label="" value="-0.5">
                    <cldata stroke="#000000" stroke_width="1" fill="None"/>
                </clpoint>
            </classification>
        </layer>
    </map>
</session>
'''

    def test(self):
        """Load a Thuban session with a map and classified layers."""
        session = load_session(self.filename())
        self.session = session

        map = self.session.Maps()[0] # only one map in the sample

        expected = [("My Layer", 3,
                        [("default", (), "",
                            ("#000000", 1, "None")),
                         ("single", "1", "",
                            ("#000000", 2, "None")),
                         ("single", "1", "",
                            ("#000000", 10, "None")),
                         ("single", "\xe4\xf6\xfc", "\xdcml\xe4uts",
                            ("#000000", 1, "None"))]),
                     ("My Layer 2", 4,
                         [("default", (), "",
                            ("#000000", 2, "None")),
                          ("range", (0, 1), "",
                            ("#111111", 1, "None")),
                          ("single", .5, "",
                            ("#000000", 1, "#111111")),
                          ("range", (-1, 0), "",
                            ("#000000", 1, "None")),
                          ("single", -.5, "",
                            ("#000000", 1, "None"))])]

        self.TestLayers(map.Layers(), expected)

        self.check_format()


class TestLabels(ClassificationTest):

    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="single map&amp;layer">
    <fileshapesource filetype="shapefile" id="D1"
        filename="../../Data/iceland/political.shp"/>
    <map title="Test Map">
        <projection name="Unknown">
            <parameter value="zone=26"/>
            <parameter value="proj=utm"/>
            <parameter value="ellps=clrk66"/>
        </projection>
        <layer shapestore="D1" visible="true" stroke="#000000"
                title="My Layer" stroke_width="1" fill="None">
            <classification field="POPYREG" field_type="string">
                <clnull label="hallo">
                    <cldata stroke="#000000" stroke_width="1" fill="None"/>
                </clnull>
                <clpoint label="welt" value="1">
                    <cldata stroke="#000000" stroke_width="2" fill="None"/>
                </clpoint>
            </classification>
        </layer>
    </map>
</session>
'''

    def test(self):
        """Load a session and test for reading the group labels."""
        eq = self.assertEquals
        session = load_session(self.filename())
        self.session = session

        map = self.session.Maps()[0] # only one map in the sample

        expected = [("My Layer", 1,
                        [("default", (), "hallo",
                            ("#000000", 1, "None")),
                         ("single", "1", "welt",
                            ("#000000", 2, "None"))])]

        self.TestLayers(map.Layers(), expected)
        self.check_format()


class TestLayerProjection(LoadSessionTest):

    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="single map&amp;layer">
    <fileshapesource filetype="shapefile" id="D2"
        filename="../../Data/iceland/roads-line.shp"/>
    <fileshapesource filetype="shapefile" id="D4"
        filename="../../Data/iceland/political.shp"/>
    <map title="Test Map">
        <projection name="Unknown">
            <parameter value="zone=26"/>
            <parameter value="proj=utm"/>
            <parameter value="ellps=clrk66"/>
        </projection>
        <layer shapestore="D4" visible="true" stroke="#000000"
                title="My Layer" stroke_width="1" fill="None">
            <projection name="hello">
                <parameter value="zone=13"/>
                <parameter value="proj=tmerc"/>
                <parameter value="ellps=clrk66"/>
            </projection>
            <classification field="POPYREG" field_type="string">
                <clnull label="hallo">
                    <cldata stroke="#000000" stroke_width="1" fill="None"/>
                </clnull>
                <clpoint label="welt" value="1">
                    <cldata stroke="#000000" stroke_width="2" fill="None"/>
                </clpoint>
            </classification>
        </layer>
        <layer shapestore="D2" visible="true" stroke="#000000"
                title="My Layer" stroke_width="1" fill="None">
            <projection name="Unknown">
                <parameter value="proj=lcc"/>
                <parameter value="lat_1=10"/>
                <parameter value="lat_2=20"/>
                <parameter value="ellps=clrk66"/>
            </projection>
        </layer>
    </map>
</session>
'''

    def test(self):
        """Test loading layers with projections"""
        eq = self.assertEquals
        neq = self.assertNotEqual

        session = load_session(self.filename())
        self.session = session

        map = self.session.Maps()[0] # only one map in the sample

        layers = map.Layers() # two layers in the sample

        # test layer with a named projection
        proj = layers[0].GetProjection()
        neq(proj, None)
        eq(proj.GetName(), "hello")
        eq(proj.GetParameter("proj"), "tmerc")
        eq(proj.GetParameter("zone"), "13")
        eq(proj.GetParameter("ellps"), "clrk66")

        # test layer with an unnamed projection
        proj = layers[1].GetProjection()
        neq(proj, None)
        eq(proj.GetName(), "Unknown")
        eq(proj.GetParameter("proj"), "lcc")
        eq(proj.GetParameter("lat_1"), "10")
        eq(proj.GetParameter("lat_2"), "20")
        eq(proj.GetParameter("ellps"), "clrk66")

        self.check_format()


class TestRasterLayer(LoadSessionTest):

    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="single map&amp;layer">
    <map title="Test Map">
        <rasterlayer visible="false" filename="../../Data/iceland/island.tif"
                title="My RasterLayer"/>
    </map>
</session>
'''

    def test(self):
        eq = self.assertEquals
        neq = self.assertNotEqual

        session = load_session(self.filename())
        self.session = session

        map = self.session.Maps()[0] # only one map in the sample

        layer = map.Layers()[0] # one layer in the sample

        eq(layer.Title(), "My RasterLayer")
        self.failIf(layer.Visible())
        self.failUnless(filenames_equal(layer.GetImageFilename(),
                                        os.path.join(self.temp_dir(),
                                                     os.pardir, os.pardir,
                                                     "Data", "iceland",
                                                     "island.tif")))
        self.check_format()


class TestJoinedTable(LoadSessionTest):

    file_contents = '''<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd" title="A Joined Table session">
    <fileshapesource filetype="shapefile" id="D137227612"
        filename="../../Data/iceland/roads-line.shp"/>
    <filetable filetype="DBF" filename="load_joinedtable.dbf" id="D136171140"
        title="Some Title"/>
    <jointable id="D136169900" title="Joined"
        right="D136171140" left="D137227612"
        leftcolumn="RDLNTYPE" rightcolumn="RDTYPE"
        jointype="LEFT OUTER"/>
    <derivedshapesource table="D136169900" shapesource="D137227612"
        id="D136170932"/>
    <map title="Test Map">
        <layer shapestore="D136170932" visible="true" stroke="#000000"
                title="My Layer" stroke_width="1" fill="None"/>
    </map>
</session>
'''

    def setUp(self):
        """Extend inherited method to create the dbffile for the join"""
        LoadSessionTest.setUp(self)
        dbffile = self.temp_file_name("load_joinedtable.dbf")
        dbf = dbflib.create(dbffile)
        dbf.add_field("RDTYPE", dbflib.FTInteger, 10, 0)
        dbf.add_field("TEXT", dbflib.FTString, 10, 0)
        dbf.write_record(0, {'RDTYPE': 8, "TEXT": "foo"})
        dbf.write_record(1, {'RDTYPE': 2, "TEXT": "bar"})
        dbf.write_record(2, {'RDTYPE': 3, "TEXT": "baz"})
        dbf.close()

    def test(self):
        """Test loading a session containing a joined table"""
        session = load_session(self.filename())
        self.session = session

        tables = session.Tables()
        self.assertEquals(len(tables), 3)
        # FIXME: The tests shouldn't assume a certain order of the tables
        self.assertEquals(tables[0].Title(), "Some Title")
        self.assertEquals(tables[1].Title(), "Joined")
        self.assertEquals(tables[1].JoinType(), "LEFT OUTER")
        self.check_format()


class TestPostGISLayer(LoadSessionTest):

    file_contents = '''<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="unnamed session">
    <dbconnection port="%(port)s" host="%(host)s" user="%(user)s"
        dbtype="postgis" id="D142684948" dbname="%(dbname)s"/>
    <dbshapesource tablename="landmarks" id="D143149420" dbconn="D142684948"/>
    <map title="unnamed map">
        <layer shapestore="D143149420" visible="true" stroke="#000000"
                title="landmarks" stroke_width="1" fill="None"/>
    </map>
</session>
'''

    def setUp(self):
        """Extend the inherited method to start the postgis server

        Furthermore, patch the file contents with the real postgis db
        information
        """
        postgissupport.skip_if_no_postgis()
        self.server = postgissupport.get_test_server()
        self.postgisdb = self.server.get_default_static_data_db()

        self.file_contents = self.__class__.file_contents % {
            "dbname": self.postgisdb.dbname,
            "user": self.server.user_name,
            "port": self.server.port,
            "host": self.server.host}
        LoadSessionTest.setUp(self)

    def test(self):
        """Test loading a session containing a postgis shapestore"""
        session = load_session(self.filename())
        self.session = session
        connections = session.DBConnections()
        self.assertEquals(len(connections), 1)
        conn = connections[0]
        for attr, value in [("host", self.server.host),
                            ("port", str(self.server.port)),
                            ("user", self.server.user_name),
                            ("dbname", self.postgisdb.dbname)]:
            self.assertEquals(getattr(conn, attr), value)
        layer = session.Maps()[0].Layers()[0]
        self.failUnless(layer.ShapeStore().DBConnection() is conn)


class TestPostGISLayerPassword(LoadSessionTest):

    file_contents = '''<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="unnamed session">
    <dbconnection port="%(port)s" host="%(host)s" user="%(user)s"
        dbtype="postgis" id="D142684948" dbname="%(dbname)s"/>
    <dbshapesource tablename="landmarks" id="D143149420" dbconn="D142684948"/>
    <map title="unnamed map">
        <layer shapestore="D143149420" visible="true" stroke="#000000"
                title="landmarks" stroke_width="1" fill="None"/>
    </map>
</session>
'''

    def setUp(self):
        """Extend the inherited method to start the postgis server

        Furthermore, patch the file contents with the real postgis db
        information
        """
        postgissupport.skip_if_no_postgis()
        self.server = postgissupport.get_test_server()
        self.postgisdb = self.server.get_default_static_data_db()

        self.file_contents = self.__class__.file_contents % {
            "dbname": self.postgisdb.dbname,
            "user": self.server.user_name,
            "port": self.server.port,
            "host": self.server.host}
        LoadSessionTest.setUp(self)

        self.db_connection_callback_called = False
        self.server.require_authentication(True)

    def tearDown(self):
        """Extend the inherited method to switch off postgresql authentication
        """
        self.server.require_authentication(False)
        LoadSessionTest.tearDown(self)

    def db_connection_callback(self, params, message):
        """Implementation of Thuban.Model.hooks.query_db_connection_parameters
        """
        self.assertEquals(params,
                          {"dbname": self.postgisdb.dbname,
                           "user": self.server.user_name,
                           "port": str(self.server.port),
                           "host": self.server.host})
        self.db_connection_callback_called = True
        params = params.copy()
        params["password"] = self.server.user_password
        return params

    def test_with_callback(self):
        """Test loading a session with postgis, authentication and a callback
        """
        session = load_session(self.filename(),
                      db_connection_callback = self.db_connection_callback)
        self.session = session
        connections = session.DBConnections()
        self.assertEquals(len(connections), 1)
        conn = connections[0]
        for attr, value in [("host", self.server.host),
                            ("port", str(self.server.port)),
                            ("user", self.server.user_name),
                            ("dbname", self.postgisdb.dbname)]:
            self.assertEquals(getattr(conn, attr), value)
        layer = session.Maps()[0].Layers()[0]
        self.failUnless(layer.ShapeStore().DBConnection() is conn)
        self.failUnless(self.db_connection_callback_called)

    def test_without_callback(self):
        """Test loading a session with postgis, authentication and no callback
        """
        # A password is required and there's no callback, so we should
        # get a ConnectionError
        self.assertRaises(ConnectionError, load_session, self.filename())

    def test_cancel(self):
        """Test loading a session with postgis and cancelling authentication
        """
        def cancel(*args):
            self.db_connection_callback_called = True
            return None

        # If the user cancels, i.e. if the callbakc returns None, a
        # LoadCancelled exception is raised.
        self.assertRaises(LoadCancelled,
                          load_session, self.filename(), cancel)
        self.failUnless(self.db_connection_callback_called)


class TestLoadError(LoadSessionTest):

    file_contents = '''\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE session SYSTEM "thuban-1.0.dtd">
<session xmlns="http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd"
        title="single map&amp;layer">
    <fileshapesource id="D1" filename="../../Data/iceland/political.shp"/>
    <map title="Test Map">
        <projection name="Unknown">
            <parameter value="zone=26"/>
            <parameter value="proj=utm"/>
            <parameter value="ellps=clrk66"/>
        </projection>
        <layer shapestore="D1" visible="true"
                stroke="#000000" title="My Layer" stroke_width="1"
                fill="None"/>
    </map>
</session>
'''

    def test(self):
        """Test loading a session missing a required attribute"""
        # Don't use assertRaises to make sure that if a session is
        # actually returned it gets destroyed properly.
        try:
            self.session = load_session(self.filename())
        except LoadError, value:
            # Check the actual messge in value to make sure the
            # LoadError really was about the missing attribute
            self.assertEquals(str(value),
              "Element "
              "(u'http://thuban.intevation.org/dtds/thuban-1.0-dev.dtd',"
              " u'fileshapesource') requires an attribute 'filetype'")
        else:
            self.fail("Missing filetype attribute doesn't raise LoadError")

if __name__ == "__main__":
    support.run_tests()
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