forked from ebhomengo/niki
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
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// Copyright 2016 Qiang Xue. 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 "errors"
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// In returns a validation rule that checks if a value can be found in the given list of values.
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// Note that the value being checked and the possible range of values must be of the same type.
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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 In(values ...interface{}) *InRule {
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return &InRule{
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elements: values,
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message: "must be a valid value",
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}
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}
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type InRule struct {
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elements []interface{}
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message string
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}
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// Validate checks if the given value is valid or not.
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func (r *InRule) 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 e == value {
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return nil
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}
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}
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return errors.New(r.message)
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}
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// Error sets the error message for the rule.
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func (r *InRule) Error(message string) *InRule {
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r.message = message
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return r
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}
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