/usr/lib/python2.7/dist-packages/owslib/swe/observation/om.py is in python-owslib 0.16.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# =============================================================================
# Copyright (c) 2014 Pete Taylor
#
# Authors : Pete Taylor <peterataylor@gmail.com>
#
# Contact email: peterataylor@gmail.com
# =============================================================================
from owslib.util import nspath_eval, extract_time
from owslib.namespaces import Namespaces
from owslib.util import testXMLAttribute, testXMLValue
def get_namespaces():
ns = Namespaces()
return ns.get_namespaces(["swe20", "xlink", "sos20", "om20", "gml32",
"xsi"])
namespaces = get_namespaces()
def nspv(path):
return nspath_eval(path, namespaces)
class TimePeriod(object):
''' Basic class for gml TimePeriod '''
def __init__(self, start, end):
self.start = start
self.end = end
def __str__(self):
return ("start: " + str(self.start) + " " +
"end: " + str(self.end))
class OM_Observation(object):
''' The base OM_Observation type, of which there may be many
specialisations, e.g. MesaurementObservation, SWE Observation, WML2 etc.
Currently assumes that many properties are xlink only (not inline).
'''
def __init__(self, element):
self.type = testXMLAttribute(element.find(nspv(
"om20:type")), nspv("xlink:href"))
self.featureOfInterest = testXMLAttribute(element.find(nspv(
"om20:featureOfInterest")), nspv("xlink:href"))
self.observedProperty = testXMLAttribute(element.find(nspv(
"om20:observedProperty")), nspv("xlink:href"))
self.procedure = testXMLAttribute(element.find(nspv(
"om20:procedure")), nspv("xlink:href"))
''' Determine if phenom time is instant or a period. This
depend on the type of observation -- this could be split out '''
instant_element = element.find(nspv(
"om20:phenomenonTime/gml32:TimeInstant"))
if instant_element is not None:
self.phenomenonTime = extract_time(instant_element)
else:
start = extract_time(element.find(nspv(
"om20:phenomenonTime/gml32:TimePeriod/gml32:beginPosition")))
end = extract_time(element.find(nspv(
"om20:phenomenonTime/gml32:TimePeriod/gml32:endPosition")))
self.phenomenonTime = TimePeriod(start, end)
self.resultTime = extract_time(element.find(nspv(
"om20:resultTime/gml32:TimeInstant/gml32:timePosition")))
self.result = element.find(nspv("om20:result"))
def get_result(self):
''' This will handle different result types using specialised
observation types '''
return self.result
class MeasurementObservation(OM_Observation):
''' Specialised observation type that has a measurement (value + uom)
as result type
'''
def __init__(self, element):
super(MeasurementObservation, self).__init__(element)
self._parse_result()
def _parse_result(self):
''' Parse the result property, extracting the value
and unit of measure '''
if self.result is not None:
uom = testXMLAttribute(self.result, "uom")
value_str = testXMLValue(self.result)
try:
value = float(value_str)
except:
raise ValueError("Error parsing measurement value")
self.result = Measurement(value, uom)
def get_result(self):
return self.result
class Result(object):
''' Base class for different OM_Observation result types '''
def __init__(self, element):
pass
class Measurement(Result):
''' A single measurement (value + uom) '''
def __init__(self, value, uom):
super(Measurement, self).__init__(None)
self.value = value
self.uom = uom
def __str__(self):
return str(self.value) + "(" + self.uom + ")"
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