source: geniuswebcore/geniusweb/profile/utilityspace/DiscreteValueSetUtilities.py@ 100

Last change on this file since 100 was 100, checked in by ruud, 19 months ago

python installs also wheel to avoid error messages

File size: 2.7 KB
Line 
1from copy import copy
2from decimal import Decimal
3from typing import Dict, cast, Optional
4
5from pyson.JsonGetter import JsonGetter
6
7from geniusweb.issuevalue.DiscreteValue import DiscreteValue
8from geniusweb.issuevalue.DiscreteValueSet import DiscreteValueSet
9from geniusweb.issuevalue.Value import Value
10from geniusweb.issuevalue.ValueSet import ValueSet
11from geniusweb.profile.utilityspace.ValueSetUtilities import ValueSetUtilities
12from geniusweb.utils import toStr
13
14
15class DiscreteValueSetUtilities (ValueSetUtilities) :
16 '''
17 Links a set of values to utilities for that value. Does not link to some
18 issue so may need further checking when used for an actual issue. Constructor
19 guarantees that
20 <ul>
21 <li>All values in the provided map (the utilities) are in [0,1]
22 <li>All keys are proper {@link DiscreteValue}s
23 </ul>
24 '''
25
26 def __init__(self, valueUtilities: Dict[DiscreteValue, Decimal] ):
27 '''
28 create new object based on the given mapping from values to utilities.
29
30 @param valueUtils map with key {@link DiscreteValue}s and value a Double
31 in the range [0,1].
32 @throws NullPointerException if one of the args is null
33 @throws IllegalArgumentException if values are not in range [0,1].
34
35 '''
36
37 if valueUtilities == None:
38 raise ValueError("valueUtils==null")
39
40 if None in valueUtilities.keys():
41 raise ValueError("one of the keys in valueUtils is null")
42
43 for v in valueUtilities.values():
44 if v==None or v<Decimal("0") or v>Decimal("1"):
45 raise ValueError("Weights in valueUtils must all be in [0,1]")
46
47 self._valueUtilities = copy(valueUtilities);
48
49 #Override
50 def getUtility(self, value:Optional[Value]) -> Decimal:
51 if not value in self._valueUtilities:
52 return Decimal("0")
53 return self._valueUtilities[value] # type: ignore
54
55 @JsonGetter("valueUtilities")
56 def getUtilities(self) -> Dict[DiscreteValue, Decimal] :
57 '''
58 @return copy of the value-utility pair map.
59 '''
60 return copy(self._valueUtilities)
61
62
63 #Override
64 def isFitting(self, valueset:ValueSet ) ->str:
65 if not isinstance(valueset, DiscreteValueSet):
66 return "The utilities are for a discrete valueset but the given values are "\
67 + str(valueset);
68
69 discvalueset = cast(DiscreteValueSet, valueset)
70 if self._valueUtilities.keys() != set(discvalueset.getValues()):
71 return "The values in the set " + str(valueset) \
72 + " do not match the values mapped to utilities " \
73 + str(self._valueUtilities.keys());
74 return cast(str,None)
75
76 def __repr__(self):
77 return "DiscreteValueSetUtilities" + toStr(self._valueUtilities)
78
79
80 def __hash__(self):
81 return hash(tuple(self._valueUtilities.items()))
82
83 def __eq__(self, other):
84 return isinstance(other, self.__class__) and \
85 self._valueUtilities == other._valueUtilities
86
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