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#############################################################
## ##
## Copyright (c) 2003-2011 by The University of Queensland ##
## Earth Systems Science Computational Centre (ESSCC) ##
## http://www.uq.edu.au/esscc ##
## ##
## Primary Business: Brisbane, Queensland, Australia ##
## Licensed under the Open Software License version 3.0 ##
## http://www.opensource.org/licenses/osl-3.0.php ##
## ##
#############################################################
"""
Defines the L{PointExtractor} class.
"""
from Extractor import Extractor
class PointExtractor(Extractor):
"""
Extracts a point from a data-record.
"""
def __init__(
self,
pointMap = lambda dataRecord: dataRecord.getPoint()
):
"""
Constructs the extractor.
@type pointMap: callable
@param pointMap: Callable which accepts a single argument
and returns a 3 float-element sequence.
"""
self.pointMap = pointMap
def getPoint(self, dataRecord):
"""
Returns a point associated with the specifed C{dataRecord}.
@rtype: 3 float-element sequence
@return: A coordinate.
"""
return self.pointMap(dataRecord)
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