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# Copyright 2011 Google Inc. All Rights Reserved.
"""Module to represent a Field in an experiment file."""
class Field(object):
"""Class representing a Field in an experiment file."""
def __init__(self, name, required, default, inheritable, description):
self.name = name
self.required = required
self.assigned = False
self.default = default
self._value = default
self.inheritable = inheritable
self.description = description
def Set(self, value, parse=True):
if parse:
self._value = self._Parse(value)
else:
self._value = value
self.assigned = True
def Append(self, value):
self._value += self._Parse(value)
self.assigned = True
def _Parse(self, value):
return value
def Get(self):
return self._value
def GetString(self):
return str(self._value)
class TextField(Field):
"""Class of text field."""
def __init__(self,
name,
required=False,
default='',
inheritable=False,
description=''):
super(TextField, self).__init__(name, required, default, inheritable,
description)
def _Parse(self, value):
return str(value)
class BooleanField(Field):
"""Class of boolean field."""
def __init__(self,
name,
required=False,
default=False,
inheritable=False,
description=''):
super(BooleanField, self).__init__(name, required, default, inheritable,
description)
def _Parse(self, value):
if value.lower() == 'true':
return True
elif value.lower() == 'false':
return False
raise TypeError("Invalid value for '%s'. Must be true or false." %
self.name)
class IntegerField(Field):
"""Class of integer field."""
def __init__(self,
name,
required=False,
default=0,
inheritable=False,
description=''):
super(IntegerField, self).__init__(name, required, default, inheritable,
description)
def _Parse(self, value):
return int(value)
class FloatField(Field):
"""Class of float field."""
def __init__(self,
name,
required=False,
default=0,
inheritable=False,
description=''):
super(FloatField, self).__init__(name, required, default, inheritable,
description)
def _Parse(self, value):
return float(value)
class ListField(Field):
"""Class of list field."""
def __init__(self,
name,
required=False,
default=None,
inheritable=False,
description=''):
super(ListField, self).__init__(name, required, default, inheritable,
description)
def _Parse(self, value):
return value.split()
def GetString(self):
return ' '.join(self._value)
def Append(self, value):
v = self._Parse(value)
if not self._value:
self._value = v
else:
self._value += v
self.assigned = True
class EnumField(Field):
"""Class of enum field."""
def __init__(self,
name,
options,
required=False,
default='',
inheritable=False,
description=''):
super(EnumField, self).__init__(name, required, default, inheritable,
description)
self.options = options
def _Parse(self, value):
if value not in self.options:
raise TypeError("Invalid enum value for field '%s'. Must be one of (%s)" %
(self.name, ', '.join(self.options)))
return str(value)
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