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###############################################################################
#
# Relationships - A class for writing the Excel XLSX Worksheet file.
#
# Copyright 2013-2015, John McNamara, jmcnamara@cpan.org
#
# Package imports.
from . import xmlwriter
# Long namespace strings used in the class.
schema_root = 'http://schemas.openxmlformats.org'
package_schema = schema_root + '/package/2006/relationships'
document_schema = schema_root + '/officeDocument/2006/relationships'
class Relationships(xmlwriter.XMLwriter):
"""
A class for writing the Excel XLSX Relationships file.
"""
###########################################################################
#
# Public API.
#
###########################################################################
def __init__(self):
"""
Constructor.
"""
super(Relationships, self).__init__()
self.relationships = []
self.id = 1
###########################################################################
#
# Private API.
#
###########################################################################
def _assemble_xml_file(self):
# Assemble and write the XML file.
# Write the XML declaration.
self._xml_declaration()
self._write_relationships()
# Close the file.
self._xml_close()
def _add_document_relationship(self, rel_type, target, target_mode=None):
# Add container relationship to XLSX .rels xml files.
rel_type = document_schema + rel_type
self.relationships.append((rel_type, target, target_mode))
def _add_package_relationship(self, rel_type, target):
# Add container relationship to XLSX .rels xml files.
rel_type = package_schema + rel_type
self.relationships.append((rel_type, target, None))
def _add_ms_package_relationship(self, rel_type, target):
# Add container relationship to XLSX .rels xml files. Uses MS schema.
schema = 'http://schemas.microsoft.com/office/2006/relationships'
rel_type = schema + rel_type
self.relationships.append((rel_type, target, None))
def _add_worksheet_relationship(self, rel_type, target, target_mode=None):
# Add worksheet relationship to sheet.rels xml files.
rel_type = document_schema + rel_type
self.relationships.append((rel_type, target, target_mode))
###########################################################################
#
# XML methods.
#
###########################################################################
def _write_relationships(self):
# Write the <Relationships> element.
attributes = [('xmlns', package_schema,)]
self._xml_start_tag('Relationships', attributes)
for relationship in self.relationships:
self._write_relationship(relationship)
self._xml_end_tag('Relationships')
def _write_relationship(self, relationship):
# Write the <Relationship> element.
rel_type, target, target_mode = relationship
attributes = [
('Id', 'rId' + str(self.id)),
('Type', rel_type),
('Target', target),
]
self.id += 1
if target_mode:
attributes.append(('TargetMode', target_mode))
self._xml_empty_tag('Relationship', attributes)