def get_table_details(self, filename, tablename):
# return table name, id column name, geometry column name, and extent.
mddata = DatabaseManager.get_metadata(filename)
if mddata:
layer_info = mddata.get(tablename, None)
if layer_info:
return (layer_info.get('table', None),
layer_info.get('id_column', None),
layer_info.get('geometry_column', None),
layer_info.get('base_extent', None))
return (None, None, None, None)
def get_table_details(self, filename, tablename):
# return table name, id column name, geometry column name, and extent.
mddata = DatabaseManager.get_metadata(filename)
if mddata:
layer_info = mddata.get(tablename, None)
if layer_info:
return (layer_info.get('table', None),
layer_info.get('id_column', None),
layer_info.get('geometry_column', None),
layer_info.get('base_extent', None))
return (None, None, None, None)
def add_layer_obj(self, map):
"""
Create mapserver layer object.
The raster data for the layer is located at filename, which
should be an absolute path on the local filesystem.
"""
# inspect data if we haven't yet
self._inspect_data()
# create a layer object
layer = mapscript.layerObj()
# NAME
layer.name = "DEFAULT" # TODO: filename?
# TYPE
layer.type = mapscript.MS_LAYER_POLYGON
# STATUS
layer.status = mapscript.MS_ON
# mark layer as queryable
layer.template = "query" # anything non null and with length > 0 works here
# Extract the base table and attribute table from typeNames
# typeNames = {base_filename}-{base tanlename}.{attribute_filename}-{attribute tablename}
# i.e. SH_Network.gdb-ahgfcatchment.stream_attributesv1.1.5.gdb-climate_lut
type_name = self.request.params.get('typeNames', None)
if type_name is None:
raise Exception("Missing typeNames")
# Parse to get filenames and layer names so that we can get the corresponding geometry and attribute tables.
base_fname, base_table, attr_fname, attr_table = self.parse_typeName(
type_name)
if attr_fname is None or attr_table is None:
raise Exception(
"Invalid typeNames in request: no such layer '{layer}'".format(
layer=attr_table))
# set layer name
layer.name = type_name
# get the attribute table and its metadata
db_attr_table, id_col, geom_col, extent = self.get_table_details(
attr_fname, attr_table)
if db_attr_table is None:
raise Exception(
"Invalid typeNames in request: no such layer '{layer}'".format(
layer=attr_table))
# Get the corresposning base table, and its id and geometry column names
db_base_table = None
common_col = None
if base_table:
db_base_table, id_col, geom_col, extent = self.get_table_details(
base_fname, base_table)
if db_base_table is None or id_col is None or geom_col is None:
raise Exception(
"Missing or invalid base table for {layer}".format(
layer=base_table))
# Get the foreign key i.e. the joinable column
common_col = self.request.params.get('foreignKey', None)
if common_col is None:
raise Exception("Missing foreignKey in request")
else:
db_base_table = db_attr_table
if extent:
layer.setExtent(extent['xmin'], extent['ymin'], extent['xmax'],
extent['ymax'])
# get the feature ids. It must be in the format: {layername}.fid
featureId = self.request.params.get('featureID', '')
fidlist = featureId.split(',')
fid = ','.join([
v.split('{layername}.'.format(layername=layer.name))[1]
for v in fidlist if len(v.split('.')) > 1
])
if len(fid) == 0:
fid = None
# get the attribute names.
attributeNames = self.request.params.get('attributes', None)
# DATA, in the format of "<column> from <tablename> using unique fid using srid=xxxx"
# table must have fid and geom
# table_attribute in the form 'table-name:attrubute1'
if DatabaseManager.is_configured():
# Connection to POSTGIS DB server
layer.connectiontype = mapscript.MS_POSTGIS
layer.connection = DatabaseManager.connection_details()
if db_attr_table != db_base_table:
# Get all attributes of the attribute table if not specified
layer_info = None
if attributeNames is None:
mddata = DatabaseManager.get_metadata(attr_fname)
if mddata:
layer_info = mddata.get(attr_table, None)
if layer_info:
fields = [i.lower() for i in layer_info.get('fields')]
# Remove the id column and foreign key
a_idcol = layer_info.get('id_column')
for item in [a_idcol.lower(), common_col.lower()]:
if item in fields:
fields.remove(item)
attributeNames = ','.join(fields)
if fid:
newtable = "(select b.*, {attributes} from {atable} a join {base} b on a.{ccol} = b.{ccol} and b.{idcol} in ({ids}))".format(
attributes=attributeNames,
atable=db_attr_table,
base=db_base_table,
ccol=common_col,
idcol=id_col,
ids=fid,
geom=geom_col)
else:
newtable = "(select b.*, {attributes} from {atable} a join {base} b on a.{ccol} = b.{ccol})".format(
attributes=attributeNames,
atable=db_attr_table,
base=db_base_table,
ccol=common_col,
idcol=id_col,
geom=geom_col)
else:
if fid:
newtable = "(select * from {base} where {idcol} in ({ids}))".format(
base=db_base_table, idcol=id_col, ids=fid)
else:
newtable = "(select * from {base})".format(
base=db_base_table)
srid = self.request.params.get('SRID', '4326')
layer.data = "{geom} from {table} as new_layer using unique {idcol} using srid={srid}".format(
geom=geom_col, table=newtable, idcol=id_col, srid=srid)
# Defer closing connection
layer.addProcessing("CLOSE_CONNECTION=DEFER")
else:
# TO DO: read from file
raise Exception("Database is not configured.")
# PROJECTION ... should we set this properly?
crs = self._data['crs']
layer.setProjection("init={}".format(crs))
# METADATA
# TODO: check return value of setMetaData MS_SUCCESS/MS_FAILURE
layer.setMetaData("gml_types", "auto")
layer.setMetaData("gml_featureid",
id_col) # Shall be the id column of the base table
layer.setMetaData("gml_include_items", "all") # allow raster queries
layer.setMetaData("wfs_include_items", "all")
layer.setMetaData("wfs_srs",
"EPSG:4326 EPSG:3857") # projection to serve
layer.setMetaData("wfs_title",
"BCCVL Layer") # title required for GetCapabilities
# TODO: metadata
# other things like title, author, attribution etc...
return map.insertLayer(layer)
def add_layer_obj(self, map):
"""
Create mapserver layer object.
The raster data for the layer is located at filename, which
should be an absolute path on the local filesystem.
"""
# inspect data if we haven't yet
self._inspect_data()
# create a layer object
layer = mapscript.layerObj()
# NAME
layer.name = "DEFAULT" # TODO: filename?
# TYPE
layer.type = mapscript.MS_LAYER_POLYGON
# STATUS
layer.status = mapscript.MS_ON
# mark layer as queryable
layer.template = "query" # anything non null and with length > 0 works here
# Extract the base table and attribute table from typeNames
# typeNames = {base_filename}-{base tanlename}.{attribute_filename}-{attribute tablename}
# i.e. SH_Network.gdb-ahgfcatchment.stream_attributesv1.1.5.gdb-climate_lut
type_name = self.request.params.get("typeNames", None)
if type_name is None:
raise Exception("Missing typeNames")
# Parse to get filenames and layer names so that we can get the corresponding geometry and attribute tables.
base_fname, base_table, attr_fname, attr_table = self.parse_typeName(type_name)
if attr_fname is None or attr_table is None:
raise Exception("Invalid typeNames in request: no such layer '{layer}'".format(layer=attr_table))
# set layer name
layer.name = type_name
# get the attribute table and its metadata
db_attr_table, id_col, geom_col, extent = self.get_table_details(attr_fname, attr_table)
if db_attr_table is None:
raise Exception("Invalid typeNames in request: no such layer '{layer}'".format(layer=attr_table))
# Get the corresposning base table, and its id and geometry column names
db_base_table = None
common_col = None
if base_table:
db_base_table, id_col, geom_col, extent = self.get_table_details(base_fname, base_table)
if db_base_table is None or id_col is None or geom_col is None:
raise Exception("Missing or invalid base table for {layer}".format(layer=base_table))
# Get the foreign key i.e. the joinable column
common_col = self.request.params.get("foreignKey", None)
if common_col is None:
raise Exception("Missing foreignKey in request")
else:
db_base_table = db_attr_table
if extent:
layer.setExtent(extent["xmin"], extent["ymin"], extent["xmax"], extent["ymax"])
# get the feature ids. It must be in the format: {layername}.fid
featureId = self.request.params.get("featureID", "")
fidlist = featureId.split(",")
fid = ",".join(
[v.split("{layername}.".format(layername=layer.name))[1] for v in fidlist if len(v.split(".")) > 1]
)
if len(fid) == 0:
fid = None
# get the attribute names.
attributeNames = self.request.params.get("attributes", None)
# DATA, in the format of "<column> from <tablename> using unique fid using srid=xxxx"
# table must have fid and geom
# table_attribute in the form 'table-name:attrubute1'
if DatabaseManager.is_configured():
# Connection to POSTGIS DB server
layer.connectiontype = mapscript.MS_POSTGIS
layer.connection = DatabaseManager.connection_details()
if db_attr_table != db_base_table:
# Get all attributes of the attribute table if not specified
layer_info = None
if attributeNames is None:
mddata = DatabaseManager.get_metadata(attr_fname)
if mddata:
layer_info = mddata.get(attr_table, None)
if layer_info:
fields = [i.lower() for i in layer_info.get("fields")]
# Remove the id column and foreign key
a_idcol = layer_info.get("id_column")
for item in [a_idcol.lower(), common_col.lower()]:
if item in fields:
fields.remove(item)
attributeNames = ",".join(fields)
if fid:
newtable = "(select b.*, {attributes} from {atable} a join {base} b on a.{ccol} = b.{ccol} and b.{idcol} in ({ids}))".format(
attributes=attributeNames,
atable=db_attr_table,
base=db_base_table,
ccol=common_col,
idcol=id_col,
ids=fid,
geom=geom_col,
)
else:
newtable = "(select b.*, {attributes} from {atable} a join {base} b on a.{ccol} = b.{ccol})".format(
attributes=attributeNames,
atable=db_attr_table,
base=db_base_table,
ccol=common_col,
idcol=id_col,
geom=geom_col,
)
else:
if fid:
newtable = "(select * from {base} where {idcol} in ({ids}))".format(
base=db_base_table, idcol=id_col, ids=fid
)
else:
newtable = "(select * from {base})".format(base=db_base_table)
srid = self.request.params.get("SRID", "4326")
layer.data = "{geom} from {table} as new_layer using unique {idcol} using srid={srid}".format(
geom=geom_col, table=newtable, idcol=id_col, srid=srid
)
# Defer closing connection
layer.addProcessing("CLOSE_CONNECTION=DEFER")
else:
# TO DO: read from file
raise Exception("Database is not configured.")
# PROJECTION ... should we set this properly?
crs = self._data["crs"]
layer.setProjection("init={}".format(crs))
# METADATA
# TODO: check return value of setMetaData MS_SUCCESS/MS_FAILURE
layer.setMetaData("gml_types", "auto")
layer.setMetaData("gml_featureid", id_col) # Shall be the id column of the base table
layer.setMetaData("gml_include_items", "all") # allow raster queries
layer.setMetaData("wfs_include_items", "all")
layer.setMetaData("wfs_srs", "EPSG:4326 EPSG:3857") # projection to serve
layer.setMetaData("wfs_title", "BCCVL Layer") # title required for GetCapabilities
# TODO: metadata
# other things like title, author, attribution etc...
return map.insertLayer(layer)
