niki/vendor/github.com/go-ozzo/ozzo-validation/in.go

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2024-02-18 10:42:21 +00:00
// Copyright 2016 Qiang Xue. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package validation
import "errors"
// In returns a validation rule that checks if a value can be found in the given list of values.
// Note that the value being checked and the possible range of values must be of the same type.
// An empty value is considered valid. Use the Required rule to make sure a value is not empty.
func In(values ...interface{}) *InRule {
return &InRule{
elements: values,
message: "must be a valid value",
}
}
type InRule struct {
elements []interface{}
message string
}
// Validate checks if the given value is valid or not.
func (r *InRule) Validate(value interface{}) error {
value, isNil := Indirect(value)
if isNil || IsEmpty(value) {
return nil
}
for _, e := range r.elements {
if e == value {
return nil
}
}
return errors.New(r.message)
}
// Error sets the error message for the rule.
func (r *InRule) Error(message string) *InRule {
r.message = message
return r
}