def register_layer(self, layer, defaultstyle, extrastyles=()):
layername = layer.name
if not layername:
raise ServerConfigurationError('Attempted to register an unnamed layer.')
if not layer.wms_srs and not re.match('^\+init=epsg:\d+$', layer.srs) and not re.match('^\+proj=.*$', layer.srs):
raise ServerConfigurationError('Attempted to register a layer without an epsg projection defined.')
if defaultstyle not in self.styles.keys() + self.aggregatestyles.keys():
raise ServerConfigurationError('Attempted to register a layer with an non-existent default style.')
layer.wmsdefaultstyle = defaultstyle
if isinstance(extrastyles, tuple):
for stylename in extrastyles:
if type(stylename) == type(''):
if stylename not in self.styles.keys() + self.aggregatestyles.keys():
raise ServerConfigurationError('Attempted to register a layer with an non-existent extra style.')
else:
ServerConfigurationError('Attempted to register a layer with an invalid extra style name.')
layer.wmsextrastyles = extrastyles
else:
raise ServerConfigurationError('Layer "%s" was passed an invalid list of extra styles. List must be a tuple of strings.' % layername)
layerproj = common.Projection(layer.srs)
env = getattr(layer, 'maximum_extent', layer.envelope())
llp = layerproj.inverse(Coord(env.minx, env.miny))
urp = layerproj.inverse(Coord(env.maxx, env.maxy))
if self.latlonbb is None:
self.latlonbb = Box2d(llp, urp)
else:
self.latlonbb.expand_to_include(Box2d(llp, urp))
self.ordered_layers.append(layer)
self.layers[layername] = layer
def loadXML(self, xmlfile=None, strict=False, xmlstring='', basepath=''):
"""Loads and stores a complete map definition in leiu of a set of layers.
Stores an empty style of the same name, which is the only option for rendering.
The map will be rendered as prescribed in the XML."""
config = ConfigParser.SafeConfigParser()
map_wms_srs = None
if self.configpath:
config.readfp(open(self.configpath))
if config.has_option('map', 'wms_srs'):
map_wms_srs = config.get('map', 'wms_srs')
tmp_map = Map(0,0)
if xmlfile:
load_map(tmp_map, xmlfile, strict)
elif xmlstring:
load_map_from_string(tmp_map, xmlstring, strict, basepath)
else:
raise ServerConfigurationError("Mapnik configuration XML is not specified - 'xmlfile' and 'xmlstring' variables are empty.\
Please set one of this variables to load mapnik map object.")
# parse map level attributes
if tmp_map.background:
self.map_attributes['bgcolor'] = tmp_map.background
if tmp_map.buffer_size:
self.map_attributes['buffer_size'] = tmp_map.buffer_size
if xmlfile is None :
# Map objects have no name, so just call it default.
layer_name = 'default'
else :
# The layer name is the basename of the xml file or the
# whole file name
layer_name = xmlfile
fname_match = re.match('([A-Za-z0-9_\-\.]+).xml', xmlfile)
if fname_match is not None :
layer_name = fname_match.group(1)
else :
layer_name = xmlfile
style_name = layer_name
style_obj = Style()
# Make the map have attributes expected of layers
tmp_map.name = layer_name
map_p = common.Projection(tmp_map.srs)
if map_wms_srs is None :
tmp_map.wms_srs = map_p.epsgstring()
else :
tmp_map.wms_srs = map_wms_srs
tmp_map.queryable = False
# set map extent from config file.
geog_coords = config.get('map','wms_extent').split(',')
geog_box = Box2d(float(geog_coords[0]), float(geog_coords[1]), float(geog_coords[2]), float(geog_coords[3]))
proj_box = geog_box.forward(map_p)
tmp_map.zoom_to_box(proj_box)
tmp_map.maximum_extent = proj_box
self.register_style(style_name, style_obj)
self.register_layer(tmp_map, style_name)
def register_layer(self, layer, defaultstyle, extrastyles=()):
layername = layer.name
#差错机制，检测相关参数是否有效
if not layername:
#ServerConfigurationError为从ogcserver.exceptions中导入的方法，执行内容为空
raise ServerConfigurationError(
'Attempted to register an unnamed layer.')
if not layer.wms_srs and not re.match('^\+init=epsg:\d+$',
layer.srs) and not re.match(
'^\+proj=.*$', layer.srs):
raise ServerConfigurationError(
'Attempted to register a layer without an epsg projection defined.'
)
if defaultstyle not in self.styles.keys() + self.aggregatestyles.keys(
):
raise ServerConfigurationError(
'Attempted to register a layer with an non-existent default style.'
)
layer.wmsdefaultstyle = defaultstyle
# 判断是否为tuple类型，（'a',)为tuple类型，aggregates也为tuple类型
# type(('a',))输出为 tuple
if isinstance(extrastyles, tuple):
#
for stylename in extrastyles:
# 如果stylename类型为str
if type(stylename) == type(''):
if stylename not in self.styles.keys(
) + self.aggregatestyles.keys():
raise ServerConfigurationError(
'Attempted to register a layer with an non-existent extra style.'
)
else:
ServerConfigurationError(
'Attempted to register a layer with an invalid extra style name.'
)
# wmsextrastyles？？？？
layer.wmsextrastyles = extrastyles
else:
raise ServerConfigurationError(
'Layer "%s" was passed an invalid list of extra styles. List must be a tuple of strings.'
% layername)
# 调用common中Projection
layerproj = common.Projection(layer.srs)
env = layer.envelope()
llp = layerproj.inverse(Coord(env.minx, env.miny))
urp = layerproj.inverse(Coord(env.maxx, env.maxy))
if self.latlonbb is None:
self.latlonbb = Envelope(llp, urp)
else:
self.latlonbb.expand_to_include(Envelope(llp, urp))
self.ordered_layers.append(layer)
self.layers[layername] = layer