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document-api-python/tableaudocumentapi/connection.py at master · bodschut/document-api-python · GitHub
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connection.py
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connection.py
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###############################################################################
#
# Connection - A class for writing connections to Tableau files
#
###############################################################################
import
xml
.
etree
.
ElementTree
as
ET
from
tableaudocumentapi
.
dbclass
import
is_valid_dbclass
class
Connection
(
object
):
"""
A class for writing connections to Tableau files.
"""
###########################################################################
#
# Public API.
#
###########################################################################
def
__init__
(
self
,
connxml
):
"""
Constructor.
"""
self
.
_connectionXML
=
connxml
self
.
_dbname
=
connxml
.
get
(
'dbname'
)
self
.
_server
=
connxml
.
get
(
'server'
)
self
.
_username
=
connxml
.
get
(
'username'
)
self
.
_authentication
=
connxml
.
get
(
'authentication'
)
self
.
_class
=
connxml
.
get
(
'class'
)
self
.
_port
=
connxml
.
get
(
'port'
,
None
)
def
__repr__
(
self
):
return
"'<Connection server='{}' dbname='{}' @ {}>'"
.
format
(
self
.
_server
,
self
.
_dbname
,
hex
(
id
(
self
)))
@
classmethod
def
from_attributes
(
cls
,
server
,
dbname
,
username
,
dbclass
,
port
=
None
,
authentication
=
''
):
root
=
ET
.
Element
(
'connection'
,
authentication
=
authentication
)
xml
=
cls
(
root
)
xml
.
server
=
server
xml
.
dbname
=
dbname
xml
.
username
=
username
xml
.
dbclass
=
dbclass
xml
.
port
=
port
return
xml
###########
# dbname
###########
@
property
def
dbname
(
self
):
return
self
.
_dbname
@
dbname
.
setter
def
dbname
(
self
,
value
):
"""
Set the connection's database name property.
Args:
value: New name of the database. String.
Returns:
Nothing.
"""
self
.
_dbname
=
value
self
.
_connectionXML
.
set
(
'dbname'
,
value
)
###########
# server
###########
@
property
def
server
(
self
):
return
self
.
_server
@
server
.
setter
def
server
(
self
,
value
):
"""
Set the connection's server property.
Args:
value: New server. String.
Returns:
Nothing.
"""
self
.
_server
=
value
self
.
_connectionXML
.
set
(
'server'
,
value
)
###########
# username
###########
@
property
def
username
(
self
):
return
self
.
_username
@
username
.
setter
def
username
(
self
,
value
):
"""
Set the connection's username property.
Args:
value: New username value. String.
Returns:
Nothing.
"""
self
.
_username
=
value
self
.
_connectionXML
.
set
(
'username'
,
value
)
###########
# authentication
###########
@
property
def
authentication
(
self
):
return
self
.
_authentication
###########
# dbclass
###########
@
property
def
dbclass
(
self
):
return
self
.
_class
@
dbclass
.
setter
def
dbclass
(
self
,
value
):
if
not
is_valid_dbclass
(
value
):
raise
AttributeError
(
"'{}' is not a valid database type"
.
format
(
value
))
self
.
_class
=
value
self
.
_connectionXML
.
set
(
'class'
,
value
)
###########
# port
###########
@
property
def
port
(
self
):
return
self
.
_port
@
port
.
setter
def
port
(
self
,
value
):
self
.
_port
=
value
# If port is None we remove the element and don't write it to XML
if
value
is
None
:
try
:
del
self
.
_connectionXML
.
attrib
[
'port'
]
except
KeyError
:
pass
else
:
self
.
_connectionXML
.
set
(
'port'
,
value
)
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