from sas.sascalc.dataloader.readers.cansas_reader import Reader as CansasReader
from sas.sascalc.dataloader.data_info import Data1D
import inspect
[docs]class CansasWriter(CansasReader):
[docs] def write(self, filename, frame_data, sasentry_attrs=None):
"""
Write the content of a Data1D as a CanSAS XML file
:param filename: name of the file to write
:param datainfo: Data1D object
"""
# Create XML document
doc, _ = self._to_xml_doc(frame_data, sasentry_attrs)
# Write the file
file_ref = open(filename, 'w')
if self.encoding == None:
self.encoding = "UTF-8"
doc.write(file_ref, encoding=self.encoding,
pretty_print=True, xml_declaration=True)
file_ref.close()
def _to_xml_doc(self, frame_data, sasentry_attrs=None):
"""
Create an XML document to contain the content of an array of Data1Ds
:param frame_data: An array of Data1D objects
"""
valid_class = all([issubclass(data.__class__, Data1D) for data in frame_data])
if not valid_class:
raise RuntimeError, ("The cansas writer expects an array of "
"Data1D instances")
# Get PIs and create root element
pi_string = self._get_pi_string()
# Define namespaces and create SASroot object
main_node = self._create_main_node()
# Create ElementTree, append SASroot and apply processing instructions
base_string = pi_string + self.to_string(main_node)
base_element = self.create_element_from_string(base_string)
doc = self.create_tree(base_element)
# Create SASentry Element
entry_node = self.create_element("SASentry", sasentry_attrs)
root = doc.getroot()
root.append(entry_node)
# Use the first element in the array for writing metadata
datainfo = frame_data[0]
# Add Title to SASentry
self.write_node(entry_node, "Title", datainfo.title)
# Add Run to SASentry
self._write_run_names(datainfo, entry_node)
# Add Data info to SASEntry
for data_info in frame_data:
self._write_data(data_info, entry_node)
# Transmission Spectrum Info
self._write_trans_spectrum(datainfo, entry_node)
# Sample info
self._write_sample_info(datainfo, entry_node)
# Instrument info
instr = self._write_instrument(datainfo, entry_node)
# Source
self._write_source(datainfo, instr)
# Collimation
self._write_collimation(datainfo, instr)
# Detectors
self._write_detectors(datainfo, instr)
# Processes info
self._write_process_notes(datainfo, entry_node)
# Note info
self._write_notes(datainfo, entry_node)
# Return the document, and the SASentry node associated with
# the data we just wrote
return doc, entry_node
def _write_data(self, datainfo, entry_node):
"""
Writes the I and Q data to the XML file
:param datainfo: The Data1D object the information is coming from
:param entry_node: lxml node ElementTree object to be appended to
"""
node = self.create_element("SASdata")
self.append(node, entry_node)
for i in range(len(datainfo.x)):
point = self.create_element("Idata")
node.append(point)
self.write_node(point, "Q", datainfo.x[i],
{'unit': datainfo.x_unit})
if len(datainfo.y) >= i:
self.write_node(point, "I", datainfo.y[i],
{'unit': datainfo.y_unit})
if datainfo.dy != None and len(datainfo.dy) > i:
self.write_node(point, "Idev", datainfo.dy[i],
{'unit': datainfo.y_unit})
if datainfo.dx != None and len(datainfo.dx) > i:
self.write_node(point, "Qdev", datainfo.dx[i],
{'unit': datainfo.x_unit})
if datainfo.dxw != None and len(datainfo.dxw) > i:
self.write_node(point, "dQw", datainfo.dxw[i],
{'unit': datainfo.x_unit})
if datainfo.dxl != None and len(datainfo.dxl) > i:
self.write_node(point, "dQl", datainfo.dxl[i],
{'unit': datainfo.x_unit})