Курнат Андрей
54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
// Copyright 2018 Qiang Xue, Google LLC. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package validation
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import "reflect"
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// ErrNotInInvalid is the error that returns when a value is in a list.
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var ErrNotInInvalid = NewError("validation_not_in_invalid", "must not be in list")
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// NotIn returns a validation rule that checks if a value is absent from the given list of values.
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// Like with In(), reflect.DeepEqual() will be used to determine if two values are equal.
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// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
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func NotIn[T any](values ...T) NotInRule[T] {
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return NotInRule[T]{
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elements: values,
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err: ErrNotInInvalid,
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}
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}
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// NotInRule is a validation rule that checks if a value is absent from the given list of values.
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type NotInRule[T any] struct {
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elements []T
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err Error
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}
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// Validate checks if the given value is valid or not.
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func (r NotInRule[T]) Validate(value interface{}) error {
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value, isNil := Indirect(value)
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if isNil || IsEmpty(value) {
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return nil
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}
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for _, e := range r.elements {
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if reflect.DeepEqual(e, value) {
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return r.err
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}
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}
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return nil
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}
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// Error sets the error message for the rule.
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func (r NotInRule[T]) Error(message string) NotInRule[T] {
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r.err = r.err.SetMessage(message)
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return r
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}
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// ErrorObject sets the error struct for the rule.
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func (r NotInRule[T]) ErrorObject(err Error) NotInRule[T] {
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r.err = err
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return r
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}
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