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writer.py
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Thu, May 16, 06:40

writer.py
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import xml.dom
import xml.dom.minidom as dom
import sys
def setAttributes(node, attributes):
"""Set attributes of a node"""
map(lambda x: node.setAttribute(*x), attributes.items())
class Component:
"""Generic component class capable of registering sub-components"""
def __init__(self, name, parent_node, writer):
self.writer = writer
self.document = writer.document
self.node = self.document.createElement(name)
parent_node.appendChild(self.node)
def register(self, name, attributes=dict()):
"""Register a sub-component"""
sub_component = Component(name, self.node, self.writer)
setAttributes(sub_component.node, attributes)
return sub_component
def registerDataArray(self, data_array, append=True):
array_component = Component('DataArray', self.node, self.writer)
attributes = data_array.attributes
if append:
attributes['format'] = 'append'
attributes['offset'] = str(self.writer.offset)
self.writer.offset += data_array.flat_data.size
else:
attributes['format'] = 'binary'
setAttributes(array_component.node, attributes)
class Writer:
"""Generic XML handler for VTK files"""
def __init__(self, vtk_format, vtk_version='0.1', byte_order='LittleEndian'):
self.document = dom.getDOMImplementation().createDocument(None, 'VTKFile', None)
self.root = self.document.documentElement
self.root.setAttribute('type', vtk_format)
self.root.setAttribute('version', vtk_version)
self.root.setAttribute('byte_order', byte_order)
self.data_node = self.document.createElement(vtk_format)
self.root.appendChild(self.data_node)
self.offset = 0 # Global offset
def setDataNodeAttributes(self, attributes):
"""Set attributes for the entire dataset"""
setAttributes(self.data_node, attributes)
def registerPiece(self, attributes):
"""Register a piece element"""
piece = Component('Piece', self.data_node, self)
setAttributes(piece.node, attributes)
return piece
def __str__(self):
"""Print XML to string"""
return self.document.toprettyxml()

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