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|
package mapper
import (
"fmt"
"reflect"
)
type Mapping[TInput any, TOutput any] func(TInput) TOutput
var mappings map[string]interface{}
func init() {
mappings = map[string]interface{}{}
}
func Register[Input any, Output any](mapping Mapping[Input, Output]) {
mappings[keyFor[Input, Output]()] = mapping
}
func MapFrom[Input any, Output any](input Input) Output {
if mapping, ok := mappings[keyFor[Input, Output]()]; ok {
return mapping.(Mapping[Input, Output])(input)
}
var output Output
return output
}
func MapEachFrom[Input any, Output any](input []Input) []Output {
var zero Output
zeroValue := reflect.Zero(reflect.TypeOf(zero))
results := []Output{}
for _, item := range input {
tmp := MapFrom[Input, Output](item)
if zeroValue != reflect.ValueOf(tmp) {
results = append(results, tmp)
}
}
return results
}
func keyFor[Input any, Output any]() string {
var input Input
var output Output
return fmt.Sprintf("%v-%v", reflect.TypeOf(input), reflect.TypeOf(output))
}
|
