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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 (
"context"
"errors"
"reflect"
"strconv"
)
// Each returns a validation rule that loops through an iterable (map, slice or array)
// and validates each value inside with the provided rules.
// An empty iterable is considered valid. Use the Required rule to make sure the iterable is not empty.
func Each(rules ...Rule) EachRule {
return EachRule{
rules: rules,
}
}
// EachRule is a validation rule that validates elements in a map/slice/array using the specified list of rules.
type EachRule struct {
rules []Rule
}
// Validate loops through the given iterable and calls the Ozzo Validate() method for each value.
func (r EachRule) Validate(value interface{}) error {
return r.ValidateWithContext(nil, value)
}
// ValidateWithContext loops through the given iterable and calls the Ozzo ValidateWithContext() method for each value.
func (r EachRule) ValidateWithContext(ctx context.Context, value interface{}) error {
errs := Errors{}
v := reflect.ValueOf(value)
switch v.Kind() {
case reflect.Map:
for _, k := range v.MapKeys() {
val := r.getInterface(v.MapIndex(k))
var err error
if ctx == nil {
err = Validate(val, r.rules...)
} else {
err = ValidateWithContext(ctx, val, r.rules...)
}
if err != nil {
errs[r.getString(k)] = err
}
}
case reflect.Slice, reflect.Array:
for i := 0; i < v.Len(); i++ {
val := r.getInterface(v.Index(i))
var err error
if ctx == nil {
err = Validate(val, r.rules...)
} else {
err = ValidateWithContext(ctx, val, r.rules...)
}
if err != nil {
errs[strconv.Itoa(i)] = err
}
}
default:
return errors.New("must be an iterable (map, slice or array)")
}
if len(errs) > 0 {
return errs
}
return nil
}
func (r EachRule) getInterface(value reflect.Value) interface{} {
switch value.Kind() {
case reflect.Ptr, reflect.Interface:
if value.IsNil() {
return nil
}
return value.Elem().Interface()
default:
return value.Interface()
}
}
func (r EachRule) getString(value reflect.Value) string {
switch value.Kind() {
case reflect.Ptr, reflect.Interface:
if value.IsNil() {
return ""
}
return value.Elem().String()
default:
return value.String()
}
}
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