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1# Copyright 2011 Google Inc. All Rights Reserved.
2"""Module to represent a Field in an experiment file."""
3
4
5class Field(object):
6  """Class representing a Field in an experiment file."""
7
8  def __init__(self, name, required, default, inheritable, description):
9    self.name = name
10    self.required = required
11    self.assigned = False
12    self.default = default
13    self._value = default
14    self.inheritable = inheritable
15    self.description = description
16
17  def Set(self, value, parse=True):
18    if parse:
19      self._value = self._Parse(value)
20    else:
21      self._value = value
22    self.assigned = True
23
24  def Append(self, value):
25    self._value += self._Parse(value)
26    self.assigned = True
27
28  def _Parse(self, value):
29    return value
30
31  def Get(self):
32    return self._value
33
34  def GetString(self):
35    return str(self._value)
36
37
38class TextField(Field):
39  """Class of text field."""
40
41  def __init__(self,
42               name,
43               required=False,
44               default='',
45               inheritable=False,
46               description=''):
47    super(TextField, self).__init__(name, required, default, inheritable,
48                                    description)
49
50  def _Parse(self, value):
51    return str(value)
52
53
54class BooleanField(Field):
55  """Class of boolean field."""
56
57  def __init__(self,
58               name,
59               required=False,
60               default=False,
61               inheritable=False,
62               description=''):
63    super(BooleanField, self).__init__(name, required, default, inheritable,
64                                       description)
65
66  def _Parse(self, value):
67    if value.lower() == 'true':
68      return True
69    elif value.lower() == 'false':
70      return False
71    raise TypeError(
72        "Invalid value for '%s'. Must be true or false." % self.name)
73
74
75class IntegerField(Field):
76  """Class of integer field."""
77
78  def __init__(self,
79               name,
80               required=False,
81               default=0,
82               inheritable=False,
83               description=''):
84    super(IntegerField, self).__init__(name, required, default, inheritable,
85                                       description)
86
87  def _Parse(self, value):
88    return int(value)
89
90
91class FloatField(Field):
92  """Class of float field."""
93
94  def __init__(self,
95               name,
96               required=False,
97               default=0,
98               inheritable=False,
99               description=''):
100    super(FloatField, self).__init__(name, required, default, inheritable,
101                                     description)
102
103  def _Parse(self, value):
104    return float(value)
105
106
107class ListField(Field):
108  """Class of list field."""
109
110  def __init__(self,
111               name,
112               required=False,
113               default=None,
114               inheritable=False,
115               description=''):
116    super(ListField, self).__init__(name, required, default, inheritable,
117                                    description)
118
119  def _Parse(self, value):
120    return value.split()
121
122  def GetString(self):
123    return ' '.join(self._value)
124
125  def Append(self, value):
126    v = self._Parse(value)
127    if not self._value:
128      self._value = v
129    else:
130      self._value += v
131    self.assigned = True
132
133
134class EnumField(Field):
135  """Class of enum field."""
136
137  def __init__(self,
138               name,
139               options,
140               required=False,
141               default='',
142               inheritable=False,
143               description=''):
144    super(EnumField, self).__init__(name, required, default, inheritable,
145                                    description)
146    self.options = options
147
148  def _Parse(self, value):
149    if value not in self.options:
150      raise TypeError("Invalid enum value for field '%s'. Must be one of (%s)" %
151                      (self.name, ', '.join(self.options)))
152    return str(value)
153