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func_reference_type.go
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func_reference_type.go
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package goldi
import (
"fmt"
"reflect"
"unicode"
)
type funcReferenceType struct {
typeID *TypeID
}
// NewFuncReferenceType returns a TypeFactory that returns a method of another type as method value (function).
//
// Goldigen yaml syntax example:
// my_func_type:
// func: "@some_type::FancyAction"
func NewFuncReferenceType(typeID, functionName string) TypeFactory {
if functionName == "" || unicode.IsLower(rune(functionName[0])) {
return newInvalidType(fmt.Errorf("can not use unexported method %q as second argument to NewFuncReferenceType", functionName))
}
return &funcReferenceType{NewTypeID("@" + typeID + "::" + functionName)}
}
func (t *funcReferenceType) Arguments() []interface{} {
return []interface{}{"@" + t.typeID.ID}
}
func (t *funcReferenceType) Generate(resolver *ParameterResolver) (interface{}, error) {
referencedType, err := resolver.Container.Get(t.typeID.ID)
if err != nil {
return nil, fmt.Errorf("could not generate func reference type %s : %s", t.typeID, err)
}
v := reflect.ValueOf(referencedType)
method := v.MethodByName(t.typeID.FuncReferenceMethod)
if method.IsValid() == false {
return nil, fmt.Errorf("could not generate func reference type %s : method does not exist", t.typeID)
}
return method.Interface(), nil
}