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provider.go
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/
provider.go
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package miruken
import (
"reflect"
)
type provider struct {
value any
typ reflect.Type
}
func (p *provider) Handle(
callback any,
greedy bool,
composer Handler,
) HandleResult {
if comp, ok := callback.(*Composition); ok {
callback = comp.Callback()
}
if provides, ok := callback.(*Provides); ok {
if typ, ok := provides.Key().(reflect.Type); ok {
if p.typ.AssignableTo(typ) {
return provides.ReceiveResult(p.value, true, composer)
}
}
}
return NotHandled
}
func (p *provider) SuppressDispatch() {}
func NewProvider(value any) Handler {
if value == nil {
panic("value cannot be nil")
}
return &provider{value: value, typ: reflect.TypeOf(value)}
}
func With(values ...any) BuilderFunc {
return func(handler Handler) Handler {
var valueHandlers []any
for _, val := range values {
if val != nil {
valueHandlers = append(valueHandlers, NewProvider(val))
}
}
if len(valueHandlers) > 0 {
return AddHandlers(handler, valueHandlers...)
}
return handler
}
}