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"""Implements the TimeEvent class."""
class TimeEvent:
"""Member data:
- self.id: The time event identifier string.
- self.name: Optional descriptive name for the time event.
- self.times: A string that is a python expression, which evaluates to
the list of event times.
- self.assignments: A string that is a python expression, which evaluates to
the assignments that occur when the event is executed."""
def __init__(self, id, name, times, assignments):
self.id = id
self.name = name
self.times = times
self.assignments = assignments
def hasErrors(self):
"""Return None if the time event is valid. Otherwise return an error
message. Note that the assignments are not checked."""
# The identifier must be non-null.
if not self.id:
return 'The identifier is empty.'
try:
times = eval(self.times)
if not isinstance(times, list):
return 'The times field is not a list.'
for t in times:
try:
float(t)
except:
return 'Could not convert the time to a numeric value.'
except:
return 'Could not evaluate the time(s).'
return None
def writeXml(self, writer):
attributes = {'id': self.id, 'times': self.times,
'assignments': self.assignments}
if self.name:
attributes['name'] = self.name
writer.writeEmptyElement('timeEvent', attributes)
def readXml(self, attributes):
"""Read from an attributes dictionary. Return any errors encountered."""
# The attribute "dictionary" may not work as it should. In particular
# the test "x in attributes" may not work. Thus we need to directly
# use attributes.keys().
keys = attributes.keys()
for x in ['id', 'times', 'assignments']:
if not x in keys:
return 'Missing ' + x + ' attribute in time event.\n'
self.id = attributes['id']
if 'name' in keys:
self.name = attributes['name']
else:
self.name = ''
self.times = attributes['times']
self.assignments = attributes['assignments']
return ''
if __name__ == '__main__':
import sys
sys.path.insert(1, '..')
from fio.XmlWriter import XmlWriter
x = TimeEvent('e1', '', '[0]', 'p1=1; p2=2')
writer = XmlWriter()
x.writeXml(writer)
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