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// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package validator
import "strings"
// Validator is a general interface that allows a message to be validated.
type Validator interface {
Validate() error
}
func CallValidatorIfExists(candidate interface{}) error {
if validator, ok := candidate.(Validator); ok {
return validator.Validate()
}
return nil
}
type fieldError struct {
fieldStack []string
nestedErr error
}
func (f *fieldError) Error() string {
return "invalid field " + strings.Join(f.fieldStack, ".") + ": " + f.nestedErr.Error()
}
// FieldError wraps a given Validator error providing a message call stack.
func FieldError(fieldName string, err error) error {
if fErr, ok := err.(*fieldError); ok {
fErr.fieldStack = append([]string{fieldName}, fErr.fieldStack...)
return err
}
return &fieldError{
fieldStack: []string{fieldName},
nestedErr: err,
}
}
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