57 lines
2.1 KiB
Python
57 lines
2.1 KiB
Python
import logging
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class Parameter(object):
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"""
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Generic handler for parameters stored in configuration files
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Attributes:
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parameters dictionary containing the value for configuration parameters
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default_parameters dictionary containung default values for parameters
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"""
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def __init__(self, parameter_filename):
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self.parameters = {}
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self.default_parameters = {}
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if parameter_filename is None:
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logging.warning("No parameter file provided; using default parameters")
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else:
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logging.info("Extract parameters from file {}".format(parameter_filename))
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self.load_parameter_file(parameter_filename)
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def load_parameter_file(self, parameter_filename):
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with open(parameter_filename) as f:
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for line in f.readlines():
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# Ignore comments
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if line.startswith("#"):
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continue
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try:
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# Also get rid of trailing characters
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key, value = line.strip().split(":")
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if key in self.parameters:
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if not isinstance(self.parameters[key], list):
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self.parameters[key] = [self.parameters[key]]
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self.parameters[key].append(value)
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else:
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self.parameters[key] = value
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except ValueError as e:
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logging.warning(
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"Got error '{}' for line '{}'; ignore it".format(e, line))
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def get(self, key):
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"""
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Get the value of the parameter with key `key`.
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If not defined by the configuration file, return the default value.
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Raise Exception if the parameter has no default value and is absent.
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"""
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val = self.parameters.get(key)
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if val is None:
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if key in self.default_parameters:
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return self.default_parameters[key]
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else:
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raise Exception("Parameter not found " + key)
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else:
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return val
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def __str__(self):
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return self.parameters.__str__()
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