// UserTypeUnmarshalerImpl returns the code implementing the user type unmarshaler function.
func UserTypeUnmarshalerImpl(u *design.UserTypeDefinition, versioned bool, defaultPkg, context string) string {
validation := RecursiveChecker(u.AttributeDefinition, false, false, "source", context, 1)
var impl string
switch {
case u.IsObject():
impl = objectUnmarshalerR(u, u.AllRequired(), u.AllNonZero(), versioned, defaultPkg, context, "source", "target", 1)
case u.IsArray():
impl = arrayUnmarshalerR(u.ToArray(), versioned, defaultPkg, context, "source", "target", 1)
case u.IsHash():
impl = hashUnmarshalerR(u.ToHash(), versioned, defaultPkg, context, "source", "target", 1)
default:
return "" // No function for primitive types - they just get casted
}
data := map[string]interface{}{
"Name": userTypeUnmarshalerFuncName(u),
"Type": u,
"Impl": impl,
"MustValidate": strings.TrimSpace(validation) != "",
}
return RunTemplate(unmUserImplT, data)
}
// GoTypeTransform produces Go code that initializes the data structure defined by target from an
// instance of the data structure described by source. The algorithm matches object fields by name
// or using the value of the "transform:key" attribute metadata when present.
// The function returns an error if target is not compatible with source (different type, fields of
// different type etc). It ignores fields in target that don't have a match in source.
func GoTypeTransform(source, target *design.UserTypeDefinition, targetPkg, funcName string) (string, error) {
var impl string
var err error
switch {
case source.IsObject():
if !target.IsObject() {
return "", fmt.Errorf("source is an object but target type is %s", target.Type.Name())
}
impl, err = transformObject(source.ToObject(), target.ToObject(), targetPkg, target.TypeName, "source", "target", 1)
case source.IsArray():
if !target.IsArray() {
return "", fmt.Errorf("source is an array but target type is %s", target.Type.Name())
}
impl, err = transformArray(source.ToArray(), target.ToArray(), targetPkg, "source", "target", 1)
case source.IsHash():
if !target.IsHash() {
return "", fmt.Errorf("source is a hash but target type is %s", target.Type.Name())
}
impl, err = transformHash(source.ToHash(), target.ToHash(), targetPkg, "source", "target", 1)
default:
panic("cannot transform primitive types") // bug
}
if err != nil {
return "", err
}
t := GoTypeRef(target, nil, 0)
if strings.HasPrefix(t, "*") && len(targetPkg) > 0 {
t = fmt.Sprintf("*%s.%s", targetPkg, t[1:])
}
data := map[string]interface{}{
"Name": funcName,
"Source": source,
"Target": target,
"TargetRef": t,
"TargetPkg": targetPkg,
"Impl": impl,
}
return RunTemplate(transformT, data), nil
}