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min-max-constraints.go
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min-max-constraints.go
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package constraints
import (
"errors"
"math"
)
// MinMaxConstraints grouping constraints.
type MinMaxConstraints struct {
Max float64
Min float64
}
// ErrMinMaxConstraint custom error.
var ErrMinMaxConstraint = errors.New("min constraint cannot be greater than max constraint")
// NewMinMaxConstraints Default to largest float64 for max and smallest float64 for min.
func NewMinMaxConstraints() *MinMaxConstraints {
return &MinMaxConstraints{Max: math.MaxFloat64, Min: -math.MaxFloat64}
}
// SetMax update max constraint if current max constraint is greater than provided max.
func (mmc *MinMaxConstraints) SetMax(max float64) error {
if mmc.Max > max {
// Make sure max is greater than min
if mmc.Min > max {
return ErrMinMaxConstraint
}
mmc.Max = max
}
return nil
}
// SetMin update min constraint if current min constraint is less than provided min.
func (mmc *MinMaxConstraints) SetMin(min float64) error {
if mmc.Min < min {
// Make sure min is less than max
if mmc.Max < min {
return ErrMinMaxConstraint
}
mmc.Min = min
}
return nil
}
// GetMax returns max.
func (mmc *MinMaxConstraints) GetMax() float64 {
return mmc.Max
}
// GetMin returns min.
func (mmc *MinMaxConstraints) GetMin() float64 {
return mmc.Min
}
// ConstraintType indicates the type of constraint.
type ConstraintType int
const (
// None indicates no constraint.
None ConstraintType = iota
// MinConstraint indicates min constraint.
MinConstraint
// MaxConstraint indicates max constraint.
MaxConstraint
)
// Constrain sets constraints.
func (mmc *MinMaxConstraints) Constrain(value float64) (float64, ConstraintType) {
if value > mmc.Max {
return mmc.Max, MaxConstraint
}
if value < mmc.Min {
return mmc.Min, MinConstraint
}
return value, None
}