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package entity
import (
"fmt"
)
// MergeStatus represent the result of a merge operation of an entity
type MergeStatus int
const (
_ MergeStatus = iota
MergeStatusNew // a new Entity was created locally
MergeStatusInvalid // the remote data is invalid
MergeStatusUpdated // a local Entity has been updated
MergeStatusNothing // no changes were made to a local Entity (already up to date)
MergeStatusError // a terminal error happened
)
// MergeResult hold the result of a merge operation on an Entity.
type MergeResult struct {
// Err is set when a terminal error occur in the process
Err error
Id Id
Status MergeStatus
// Only set for invalid status
Reason string
// Not set for invalid status
Entity Interface
}
func (mr MergeResult) String() string {
switch mr.Status {
case MergeStatusNew:
return "new"
case MergeStatusInvalid:
return fmt.Sprintf("invalid data: %s", mr.Reason)
case MergeStatusUpdated:
return "updated"
case MergeStatusNothing:
return "nothing to do"
case MergeStatusError:
return fmt.Sprintf("merge error on %s: %s", mr.Id, mr.Err.Error())
default:
panic("unknown merge status")
}
}
func NewMergeError(err error, id Id) MergeResult {
return MergeResult{
Err: err,
Id: id,
Status: MergeStatusError,
}
}
// TODO: Interface --> *Entity ?
func NewMergeStatus(status MergeStatus, id Id, entity Interface) MergeResult {
return MergeResult{
Id: id,
Status: status,
// Entity is not set for an invalid merge result
Entity: entity,
}
}
func NewMergeInvalidStatus(id Id, reason string) MergeResult {
return MergeResult{
Id: id,
Status: MergeStatusInvalid,
Reason: reason,
}
}
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