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