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random-criteria-resolver.go
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/
random-criteria-resolver.go
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package criteria_ordering
import (
"github.com/Azbesciak/RealDecisionMaker/lib/model"
"github.com/Azbesciak/RealDecisionMaker/lib/utils"
)
const RandomCriteria = "random"
type RandomCriteriaOrderingResolver struct {
Generator utils.SeededValueGenerator
}
func (w *RandomCriteriaOrderingResolver) Identifier() string {
return RandomCriteria
}
func (w *RandomCriteriaOrderingResolver) OrderCriteria(
params *model.DecisionMakingParams,
props *model.BiasProps,
_ *model.BiasListener,
) *model.Criteria {
parsedProps := parseRandomOrderingProps(props)
generator := w.Generator(parsedProps.RandomSeed)
return shuffleCriteria(¶ms.Criteria, generator)
}
type randomProps struct {
RandomSeed int64 `json:"randomSeed"`
}
func parseRandomOrderingProps(props *model.BiasProps) *randomProps {
parsedProps := randomProps{}
utils.DecodeToStruct(*props, &parsedProps)
return &parsedProps
}
func shuffleCriteria(criteria *model.Criteria, generator utils.ValueGenerator) *model.Criteria {
criteriaCount := len(*criteria)
copied := make(model.Criteria, criteriaCount)
copy(copied, *criteria)
for i := criteriaCount - 1; i > 0; i-- { // Fisher–Yates shuffle
j := int(generator() * float64(i))
copied[i], copied[j] = copied[j], copied[i]
}
return &copied
}