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GeezerVison is showing github.com — document-api-python/tableaudocumentapi/workbook.py at master · bryceglarsen/document-api-python

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import weakref
from tableaudocumentapi import Datasource, xfile
from tableaudocumentapi.xfile import xml_open, TableauInvalidFileException
class Workbook(object):
"""A class for writing Tableau workbook files."""
def __init__(self, filename):
"""Open the workbook at `filename`. This will handle packaged and unpacked
workbook files automatically. This will also parse Data Sources and Worksheets
for access.
"""
self._filename = filename
self._workbookTree = xml_open(self._filename, 'workbook')
if not self._workbookTree:
raise TableauInvalidFileException("Workbook file must have a workbook element at root")
self._workbookRoot = self._workbookTree.getroot()
self._dashboards = self._prepare_dashboards(self._workbookRoot)
self._datasources = self._prepare_datasources(
self._workbookRoot)
self._datasource_index = self._prepare_datasource_index(self._datasources)
self._worksheets = self._prepare_worksheets(
self._workbookRoot, self._datasource_index)
self._shapes = self._prepare_shapes(self._workbookRoot)
@property
def dashboards(self):
return self._dashboards
@property
def datasources(self):
return self._datasources
@property
def worksheets(self):
return self._worksheets
@property
def filename(self):
return self._filename
@property
def shapes(self):
return self._shapes
def save(self):
"""
Call finalization code and save file.
Args:
None.
Returns:
Nothing.
"""
# save the file
xfile._save_file(self._filename, self._workbookTree)
def save_as(self, new_filename):
"""
Save our file with the name provided.
Args:
new_filename: New name for the workbook file. String.
Returns:
Nothing.
"""
xfile._save_file(
self._filename, self._workbookTree, new_filename)
@staticmethod
def _prepare_datasource_index(datasources):
retval = weakref.WeakValueDictionary()
for datasource in datasources:
retval[datasource.name] = datasource
return retval
@staticmethod
def _prepare_datasources(xml_root):
datasources = []
# loop through our datasources and append
datasource_elements = xml_root.find('datasources')
if datasource_elements is None:
return []
for datasource in datasource_elements:
ds = Datasource(datasource)
datasources.append(ds)
return datasources
@staticmethod
def _prepare_dashboards(xml_root):
dashboards = []
dashboard_elements = xml_root.find('.//dashboards')
if dashboard_elements is None:
return []
for dash_element in dashboard_elements:
dash_name = dash_element.attrib['name']
dashboards.append(dash_name)
return dashboards
@staticmethod
def _prepare_worksheets(xml_root, ds_index):
worksheets = []
worksheets_element = xml_root.find('.//worksheets')
if worksheets_element is None:
return worksheets
for worksheet_element in worksheets_element:
worksheet_name = worksheet_element.attrib['name']
worksheets.append(worksheet_name) # TODO: A real worksheet object, for now, only name
dependencies = worksheet_element.findall('.//datasource-dependencies')
for dependency in dependencies:
datasource_name = dependency.attrib['datasource']
datasource = ds_index[datasource_name]
for column in dependency.findall('.//column'):
column_name = column.attrib['name']
if column_name in datasource.fields:
datasource.fields[column_name].add_used_in(worksheet_name)
return worksheets
@staticmethod
def _prepare_shapes(xml_root):
shapes = []
worksheets_element = xml_root.find('.//external/shapes')
if worksheets_element is None:
return shapes
for worksheet_element in worksheets_element:
shape_name = worksheet_element.attrib['name']
shapes.append(shape_name)
return shapes
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