forked from ebhomengo/niki
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
// 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 (
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"reflect"
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)
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// ErrInInvalid is the error that returns in case of an invalid value for "in" rule.
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var ErrInInvalid = NewError("validation_in_invalid", "must be a valid value")
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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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// reflect.DeepEqual() will be used to determine if two values are equal.
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// For more details please refer to https://golang.org/pkg/reflect/#DeepEqual
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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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err: ErrInInvalid,
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}
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}
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// InRule is a validation rule that validates if a value can be found in the given list of values.
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type InRule struct {
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elements []interface{}
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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 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 reflect.DeepEqual(e, value) {
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return nil
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}
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}
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return r.err
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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.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 InRule) ErrorObject(err Error) InRule {
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r.err = err
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return r
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}
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