validation.ViolationList.Error - Code Metrics - Inspection of "violation-linked-list" - muonsoft/validation - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — main (#52)

by Igor

created 2021-05-24 16:36 UTC

validation.ViolationList.Error A

↳ Parent: Project

Complexity

Conditions

Size

Total Lines	20
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	11
CRAP Score	5

Importance

Changes

Metric	Value
cc	5
eloc	13
dl	0
loc	20
ccs	11
cts	11
cp	1
crap	5
rs	9.2833
c	0
b	0
f	0
nop	0

package validation

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"strings"

	"golang.org/x/text/language"
)

// Violation is the abstraction for validator errors. You can use your own implementations on the application
// side to use it for your needs. In order for the validator to generate application violations,
// it is necessary to implement the ViolationFactory interface and inject it into the validator.
// You can do this by using the SetViolationFactory option in the NewValidator constructor.
type Violation interface {
	error

	// Code is unique, short, and semantic string that can be used to programmatically
	// test for specific violation. All "code" values are defined in the "github.com/muonsoft/validation/code" package
	// and are protected by backward compatibility rules.
	Code() string

	// Is can be used to check that the violation contains one of the specific codes.
	// For an empty list, it should always returns false.
	Is(codes ...string) bool

	// Message is a translated message with injected values from constraint. It can be used to show
	// a description of a violation to the end-user. Possible values for build-in constraints
	// are defined in the "github.com/muonsoft/validation/message" package and can be changed at any time,
	// even in patch versions.
	Message() string

	// MessageTemplate is a template for rendering message. Alongside parameters it can be used to
	// render the message on the client-side of the library.
	MessageTemplate() string

	// Parameters is the map of the template variables and their values provided by the specific constraint.
	Parameters() []TemplateParameter

	// PropertyPath is a path that points to the violated property.
	// See PropertyPath type description for more info.
	PropertyPath() *PropertyPath
}

// ViolationFactory is the abstraction that can be used to create custom violations on the application side.
// Use the SetViolationFactory option on the NewValidator constructor to inject your own factory into the validator.
type ViolationFactory interface {
	// CreateViolation creates a new instance of Violation.
	CreateViolation(
		code,
		messageTemplate string,
		pluralCount int,
		parameters []TemplateParameter,
		propertyPath *PropertyPath,
		lang language.Tag,
	) Violation
}

// NewViolationFunc is an adapter that allows you to use ordinary functions as a ViolationFactory.
type NewViolationFunc func(
	code,
	messageTemplate string,
	pluralCount int,
	parameters []TemplateParameter,
	propertyPath *PropertyPath,
	lang language.Tag,
) Violation

// CreateViolation creates a new instance of a Violation.
func (f NewViolationFunc) CreateViolation(
	code,
	messageTemplate string,
	pluralCount int,
	parameters []TemplateParameter,
	propertyPath *PropertyPath,
	lang language.Tag,
) Violation {
	return f(code, messageTemplate, pluralCount, parameters, propertyPath, lang)
}

// ViolationList is a linked list of violations. It is the usual type of error that is returned from a validator.
type ViolationList struct {
	len   int
	first *ViolationListElement
	last  *ViolationListElement
}

// ViolationListElement points to violation build by validator. It also implements
// Violation and can be used as a proxy to underlying violation.
type ViolationListElement struct {
	next      *ViolationListElement
	violation Violation
}

// NewViolationList creates a new ViolationList, that can be immediately populated with
// variadic arguments of violations.
func NewViolationList(violations ...Violation) *ViolationList {
	list := &ViolationList{}
	list.Append(violations...)

	return list
}

// Len returns length of the linked list.
func (list *ViolationList) Len() int {
	return list.len
}

// First returns the first element of the linked list.
func (list *ViolationList) First() *ViolationListElement {
	return list.first
}

// Last returns the last element of the linked list.
func (list *ViolationList) Last() *ViolationListElement {
	return list.last
}

// Append appends violations to the end of the linked list.
func (list *ViolationList) Append(violations ...Violation) {
	for i := range violations {
		element := &ViolationListElement{violation: violations[i]}
		if list.first == nil {
			list.first = element
			list.last = element
		} else {
			list.last.next = element
			list.last = element
		}
	}

	list.len += len(violations)
}

// Join is used to append the given violation list to the end of the current list.
func (list *ViolationList) Join(violations *ViolationList) {
	if violations == nil || violations.len == 0 {
		return
	}

	if list.first == nil {
		list.first = violations.first
		list.last = violations.last
	} else {
		list.last.next = violations.first
		list.last = violations.last
	}

	list.len += violations.len
}

// Error returns a formatted list of errors as a string.
func (list *ViolationList) Error() string {
	if list.len == 0 {
		return "the list of violations is empty, it looks like you forgot to use the AsError method somewhere"
	}

	var s strings.Builder
	s.Grow(32 * list.len)

	i := 0
	for e := list.first; e != nil; e = e.next {
		v := e.violation
		if i > 0 {
			s.WriteString("; ")
		}
		if iv, ok := v.(*internalViolation); ok {
			iv.writeToBuilder(&s)
		} else {
			s.WriteString(v.Error())
		}
		i++
	}

	return s.String()
}

// AppendFromError appends a single violation or a slice of violations into the end of a given slice.
// If an error does not implement the Violation or ViolationList interface, it will return an error itself.
// Otherwise nil will be returned.
func (list *ViolationList) AppendFromError(err error) error {
	if violation, ok := UnwrapViolation(err); ok {
		list.Append(violation)
	} else if violationList, ok := UnwrapViolationList(err); ok {
		list.Join(violationList)
	} else if err != nil {
		return err
	}

	return nil
}

// Has can be used to check that at least one of the violations contains one of the specific codes.
// For an empty list of codes, it should always returns false.
func (list *ViolationList) Has(codes ...string) bool {
	for e := list.first; e != nil; e = e.next {
		if e.violation.Is(codes...) {
			return true
		}
	}

	return false
}

// Filter returns a new list of violations with violations of given codes.
func (list *ViolationList) Filter(codes ...string) *ViolationList {
	filtered := &ViolationList{}

	for e := list.first; e != nil; e = e.next {
		if e.violation.Is(codes...) {
			filtered.Append(e.violation)
		}
	}

	return filtered
}

// AsError converts the list of violations to an error. This method correctly handles cases where
// the list of violations is empty. It returns nil on an empty list, indicating that the validation was successful.
func (list *ViolationList) AsError() error {
	if list.len == 0 {
		return nil
	}

	return list
}

// AsSlice converts underlying linked list into slice of Violation.
func (list *ViolationList) AsSlice() []Violation {
	violations := make([]Violation, list.len)

	i := 0
	for e := list.first; e != nil; e = e.next {
		violations[i] = e.violation
		i++
	}

	return violations
}

// MarshalJSON marshals the linked list into JSON. Usually, you should use
// json.Marshal function for marshaling purposes.
func (list *ViolationList) MarshalJSON() ([]byte, error) {
	b := bytes.Buffer{}
	b.WriteRune('[')
	for e := list.first; e != nil; e = e.next {
		data, err := json.Marshal(e.violation)
		if err != nil {
			return nil, fmt.Errorf("failed to marshal violation: %w", err)
		}
		b.Write(data)
		if e.next != nil {
			b.WriteRune(',')
		}
	}
	b.WriteRune(']')

	return b.Bytes(), nil
}

// Next returns next element of the linked list.
func (element *ViolationListElement) Next() *ViolationListElement {
	return element.next
}

// Violation returns underlying violation value.
func (element *ViolationListElement) Violation() Violation {
	return element.violation
}

func (element *ViolationListElement) Error() string {
	return element.violation.Error()
}

func (element *ViolationListElement) Code() string {
	return element.violation.Code()
}

func (element *ViolationListElement) Is(codes ...string) bool {
	return element.violation.Is(codes...)
}

func (element *ViolationListElement) Message() string {
	return element.violation.Message()
}

func (element *ViolationListElement) MessageTemplate() string {
	return element.violation.MessageTemplate()
}

func (element *ViolationListElement) Parameters() []TemplateParameter {
	return element.violation.Parameters()
}

func (element *ViolationListElement) PropertyPath() *PropertyPath {
	return element.violation.PropertyPath()
}

// IsViolation can be used to verify that the error implements the Violation interface.
func IsViolation(err error) bool {
	var violation Violation

	return errors.As(err, &violation)
}

// IsViolationList can be used to verify that the error implements the ViolationList.
func IsViolationList(err error) bool {
	var violations *ViolationList

	return errors.As(err, &violations)
}

// UnwrapViolation is a short function to unwrap Violation from the error.
func UnwrapViolation(err error) (Violation, bool) {
	var violation Violation

	as := errors.As(err, &violation)

	return violation, as
}

// UnwrapViolationList is a short function to unwrap ViolationList from the error.
func UnwrapViolationList(err error) (*ViolationList, bool) {
	var violations *ViolationList

	as := errors.As(err, &violations)

	return violations, as
}

type internalViolation struct {
	code            string
	message         string
	messageTemplate string
	parameters      []TemplateParameter
	propertyPath    *PropertyPath
}

func (v internalViolation) Is(codes ...string) bool {
	for _, code := range codes {
		if v.code == code {
			return true
		}
	}

	return false
}

func (v internalViolation) Error() string {
	var s strings.Builder
	s.Grow(32)
	v.writeToBuilder(&s)

	return s.String()
}

func (v internalViolation) writeToBuilder(s *strings.Builder) {
	s.WriteString("violation")
	if v.propertyPath != nil {
		s.WriteString(" at '" + v.propertyPath.String() + "'")
	}
	s.WriteString(": " + v.message)
}

func (v internalViolation) Code() string {
	return v.code
}

func (v internalViolation) Message() string {
	return v.message
}

func (v internalViolation) MessageTemplate() string {
	return v.messageTemplate
}

func (v internalViolation) Parameters() []TemplateParameter {
	return v.parameters
}

func (v internalViolation) PropertyPath() *PropertyPath {
	return v.propertyPath
}

func (v internalViolation) MarshalJSON() ([]byte, error) {
	return json.Marshal(struct {
		Code         string        `json:"code"`
		Message      string        `json:"message"`
		PropertyPath *PropertyPath `json:"propertyPath,omitempty"`
	}{
		Code:         v.code,
		Message:      v.message,
		PropertyPath: v.propertyPath,
	})
}

type internalViolationFactory struct {
	translator *Translator
}

func newViolationFactory(translator *Translator) *internalViolationFactory {
	return &internalViolationFactory{translator: translator}
}

func (factory *internalViolationFactory) CreateViolation(
	code,
	messageTemplate string,
	pluralCount int,
	parameters []TemplateParameter,
	propertyPath *PropertyPath,
	lang language.Tag,
) Violation {
	message := factory.translator.translate(lang, messageTemplate, pluralCount)

	return &internalViolation{
		code:            code,
		message:         renderMessage(message, parameters),
		messageTemplate: messageTemplate,
		parameters:      parameters,
		propertyPath:    propertyPath,
	}
}

// ViolationBuilder used to build an instance of a Violation.
type ViolationBuilder struct {
	code            string
	messageTemplate string
	pluralCount     int
	parameters      []TemplateParameter
	propertyPath    *PropertyPath
	language        language.Tag

	violationFactory ViolationFactory
}

// NewViolationBuilder creates a new ViolationBuilder.
func NewViolationBuilder(factory ViolationFactory) *ViolationBuilder {
	return &ViolationBuilder{violationFactory: factory}
}

// BuildViolation creates a new ViolationBuilder for composing Violation object fluently.
func (b *ViolationBuilder) BuildViolation(code, message string) *ViolationBuilder {
	return &ViolationBuilder{
		code:             code,
		messageTemplate:  message,
		violationFactory: b.violationFactory,
	}
}

// SetParameters sets template parameters that can be injected into the violation message.
func (b *ViolationBuilder) SetParameters(parameters ...TemplateParameter) *ViolationBuilder {
	b.parameters = parameters

	return b
}

// AddParameter adds one parameter into a slice of parameters.
func (b *ViolationBuilder) AddParameter(name, value string) *ViolationBuilder {
	b.parameters = append(b.parameters, TemplateParameter{Key: name, Value: value})

	return b
}

// SetPropertyPath sets a property path of violated attribute.
func (b *ViolationBuilder) SetPropertyPath(path *PropertyPath) *ViolationBuilder {
	b.propertyPath = path

	return b
}

// SetPluralCount sets a plural number that will be used for message pluralization during translations.
func (b *ViolationBuilder) SetPluralCount(pluralCount int) *ViolationBuilder {
	b.pluralCount = pluralCount

	return b
}

// SetLanguage sets language that will be used to translate the violation message.
func (b *ViolationBuilder) SetLanguage(tag language.Tag) *ViolationBuilder {
	b.language = tag

	return b
}

// CreateViolation creates a new violation with given parameters and returns it.
// Violation is created by calling the CreateViolation method of the ViolationFactory.
func (b *ViolationBuilder) CreateViolation() Violation {
	return b.violationFactory.CreateViolation(
		b.code,
		b.messageTemplate,
		b.pluralCount,
		b.parameters,
		b.propertyPath,
		b.language,
	)
}


1		package validation
2
3		import (
4		"bytes"
5		"encoding/json"
6		"errors"
7		"fmt"
8		"strings"
9
10		"golang.org/x/text/language"
11		)
12
13		// Violation is the abstraction for validator errors. You can use your own implementations on the application
14		// side to use it for your needs. In order for the validator to generate application violations,
15		// it is necessary to implement the ViolationFactory interface and inject it into the validator.
16		// You can do this by using the SetViolationFactory option in the NewValidator constructor.
17		type Violation interface {
18		error
19
20		// Code is unique, short, and semantic string that can be used to programmatically
21		// test for specific violation. All "code" values are defined in the "github.com/muonsoft/validation/code" package
22		// and are protected by backward compatibility rules.
23		Code() string
24
25		// Is can be used to check that the violation contains one of the specific codes.
26		// For an empty list, it should always returns false.
27		Is(codes ...string) bool
28
29		// Message is a translated message with injected values from constraint. It can be used to show
30		// a description of a violation to the end-user. Possible values for build-in constraints
31		// are defined in the "github.com/muonsoft/validation/message" package and can be changed at any time,
32		// even in patch versions.
33		Message() string
34
35		// MessageTemplate is a template for rendering message. Alongside parameters it can be used to
36		// render the message on the client-side of the library.
37		MessageTemplate() string
38
39		// Parameters is the map of the template variables and their values provided by the specific constraint.
40		Parameters() []TemplateParameter
41
42		// PropertyPath is a path that points to the violated property.
43		// See PropertyPath type description for more info.
44		PropertyPath() *PropertyPath
45		}
46
47		// ViolationFactory is the abstraction that can be used to create custom violations on the application side.
48		// Use the SetViolationFactory option on the NewValidator constructor to inject your own factory into the validator.
49		type ViolationFactory interface {
50		// CreateViolation creates a new instance of Violation.
51		CreateViolation(
52		code,
53		messageTemplate string,
54		pluralCount int,
55		parameters []TemplateParameter,
56		propertyPath *PropertyPath,
57		lang language.Tag,
58		) Violation
59		}
60
61		// NewViolationFunc is an adapter that allows you to use ordinary functions as a ViolationFactory.
62		type NewViolationFunc func(
63		code,
64		messageTemplate string,
65		pluralCount int,
66		parameters []TemplateParameter,
67		propertyPath *PropertyPath,
68		lang language.Tag,
69		) Violation
70
71		// CreateViolation creates a new instance of a Violation.
72		func (f NewViolationFunc) CreateViolation(
73		code,
74		messageTemplate string,
75		pluralCount int,
76		parameters []TemplateParameter,
77		propertyPath *PropertyPath,
78		lang language.Tag,
79		) Violation {
80	1	return f(code, messageTemplate, pluralCount, parameters, propertyPath, lang)
81		}
82
83		// ViolationList is a linked list of violations. It is the usual type of error that is returned from a validator.
84		type ViolationList struct {
85		len int
86		first *ViolationListElement
87		last *ViolationListElement
88		}
89
90		// ViolationListElement points to violation build by validator. It also implements
91		// Violation and can be used as a proxy to underlying violation.
92		type ViolationListElement struct {
93		next *ViolationListElement
94		violation Violation
95		}
96
97		// NewViolationList creates a new ViolationList, that can be immediately populated with
98		// variadic arguments of violations.
99		func NewViolationList(violations ...Violation) *ViolationList {
100	1	list := &ViolationList{}
101	1	list.Append(violations...)
102
103	1	return list
104		}
105
106		// Len returns length of the linked list.
107		func (list *ViolationList) Len() int {
108	1	return list.len
109		}
110
111		// First returns the first element of the linked list.
112		func (list ViolationList) First() ViolationListElement {
113	1	return list.first
114		}
115
116		// Last returns the last element of the linked list.
117		func (list ViolationList) Last() ViolationListElement {
118	1	return list.last
119		}
120
121		// Append appends violations to the end of the linked list.
122		func (list *ViolationList) Append(violations ...Violation) {
123	1	for i := range violations {
124	1	element := &ViolationListElement{violation: violations[i]}
125	1	if list.first == nil {
126	1	list.first = element
127	1	list.last = element
128		} else {
129	1	list.last.next = element
130	1	list.last = element
131		}
132		}
133
134	1	list.len += len(violations)
135		}
136
137		// Join is used to append the given violation list to the end of the current list.
138		func (list ViolationList) Join(violations ViolationList) {
139	1	if violations == nil \|\| violations.len == 0 {
140	1	return
141		}
142
143	1	if list.first == nil {
144	1	list.first = violations.first
145	1	list.last = violations.last
146		} else {
147	1	list.last.next = violations.first
148	1	list.last = violations.last
149		}
150
151	1	list.len += violations.len
152		}
153
154		// Error returns a formatted list of errors as a string.
155		func (list *ViolationList) Error() string {
156	1	if list.len == 0 {
157	1	return "the list of violations is empty, it looks like you forgot to use the AsError method somewhere"
158		}
159
160	1	var s strings.Builder
161	1	s.Grow(32 * list.len)
162
163	1	i := 0
164	1	for e := list.first; e != nil; e = e.next {
165	1	v := e.violation
166	1	if i > 0 {
167	1	s.WriteString("; ")
168		}
169	1	if iv, ok := v.(*internalViolation); ok {
170	1	iv.writeToBuilder(&s)
171		} else {
172		s.WriteString(v.Error())
173		}
174	1	i++
175		}
176
177	1	return s.String()
178		}
179
180		// AppendFromError appends a single violation or a slice of violations into the end of a given slice.
181		// If an error does not implement the Violation or ViolationList interface, it will return an error itself.
182		// Otherwise nil will be returned.
183		func (list *ViolationList) AppendFromError(err error) error {
184	1	if violation, ok := UnwrapViolation(err); ok {
185	1	list.Append(violation)
186	1	} else if violationList, ok := UnwrapViolationList(err); ok {
187	1	list.Join(violationList)
188	1	} else if err != nil {
189	1	return err
190		}
191
192	1	return nil
193		}
194
195		// Has can be used to check that at least one of the violations contains one of the specific codes.
196		// For an empty list of codes, it should always returns false.
197		func (list *ViolationList) Has(codes ...string) bool {
198	1	for e := list.first; e != nil; e = e.next {
199	1	if e.violation.Is(codes...) {
200	1	return true
201		}
202		}
203
204	1	return false
205		}
206
207		// Filter returns a new list of violations with violations of given codes.
208		func (list ViolationList) Filter(codes ...string) ViolationList {
209	1	filtered := &ViolationList{}
210
211	1	for e := list.first; e != nil; e = e.next {
212	1	if e.violation.Is(codes...) {
213	1	filtered.Append(e.violation)
214		}
215		}
216
217	1	return filtered
218		}
219
220		// AsError converts the list of violations to an error. This method correctly handles cases where
221		// the list of violations is empty. It returns nil on an empty list, indicating that the validation was successful.
222		func (list *ViolationList) AsError() error {
223	1	if list.len == 0 {
224	1	return nil
225		}
226
227	1	return list
228		}
229
230		// AsSlice converts underlying linked list into slice of Violation.
231		func (list *ViolationList) AsSlice() []Violation {
232	1	violations := make([]Violation, list.len)
233
234	1	i := 0
235	1	for e := list.first; e != nil; e = e.next {
236	1	violations[i] = e.violation
237	1	i++
238		}
239
240	1	return violations
241		}
242
243		// MarshalJSON marshals the linked list into JSON. Usually, you should use
244		// json.Marshal function for marshaling purposes.
245		func (list *ViolationList) MarshalJSON() ([]byte, error) {
246	1	b := bytes.Buffer{}
247	1	b.WriteRune('[')
248	1	for e := list.first; e != nil; e = e.next {
249	1	data, err := json.Marshal(e.violation)
250	1	if err != nil {
251		return nil, fmt.Errorf("failed to marshal violation: %w", err)
252		}
253	1	b.Write(data)
254	1	if e.next != nil {
255	1	b.WriteRune(',')
256		}
257		}
258	1	b.WriteRune(']')
259
260	1	return b.Bytes(), nil
261		}
262
263		// Next returns next element of the linked list.
264		func (element ViolationListElement) Next() ViolationListElement {
265	1	return element.next
266		}
267
268		// Violation returns underlying violation value.
269		func (element *ViolationListElement) Violation() Violation {
270	1	return element.violation
271		}
272
273		func (element *ViolationListElement) Error() string {
274	1	return element.violation.Error()
275		}
276
277		func (element *ViolationListElement) Code() string {
278		return element.violation.Code()
279		}
280
281		func (element *ViolationListElement) Is(codes ...string) bool {
282		return element.violation.Is(codes...)
283		}
284
285		func (element *ViolationListElement) Message() string {
286		return element.violation.Message()
287		}
288
289		func (element *ViolationListElement) MessageTemplate() string {
290		return element.violation.MessageTemplate()
291		}
292
293		func (element *ViolationListElement) Parameters() []TemplateParameter {
294		return element.violation.Parameters()
295		}
296
297		func (element ViolationListElement) PropertyPath() PropertyPath {
298	1	return element.violation.PropertyPath()
299		}
300
301		// IsViolation can be used to verify that the error implements the Violation interface.
302		func IsViolation(err error) bool {
303	1	var violation Violation
304
305	1	return errors.As(err, &violation)
306		}
307
308		// IsViolationList can be used to verify that the error implements the ViolationList.
309		func IsViolationList(err error) bool {
310	1	var violations *ViolationList
311
312	1	return errors.As(err, &violations)
313		}
314
315		// UnwrapViolation is a short function to unwrap Violation from the error.
316		func UnwrapViolation(err error) (Violation, bool) {
317	1	var violation Violation
318
319	1	as := errors.As(err, &violation)
320
321	1	return violation, as
322		}
323
324		// UnwrapViolationList is a short function to unwrap ViolationList from the error.
325		func UnwrapViolationList(err error) (*ViolationList, bool) {
326	1	var violations *ViolationList
327
328	1	as := errors.As(err, &violations)
329
330	1	return violations, as
331		}
332
333		type internalViolation struct {
334		code string
335		message string
336		messageTemplate string
337		parameters []TemplateParameter
338		propertyPath *PropertyPath
339		}
340
341		func (v internalViolation) Is(codes ...string) bool {
342	1	for _, code := range codes {
343	1	if v.code == code {
344	1	return true
345		}
346		}
347
348	1	return false
349		}
350
351		func (v internalViolation) Error() string {
352	1	var s strings.Builder
353	1	s.Grow(32)
354	1	v.writeToBuilder(&s)
355
356	1	return s.String()
357		}
358
359		func (v internalViolation) writeToBuilder(s *strings.Builder) {
360	1	s.WriteString("violation")
361	1	if v.propertyPath != nil {
362	1	s.WriteString(" at '" + v.propertyPath.String() + "'")
363		}
364	1	s.WriteString(": " + v.message)
365		}
366
367		func (v internalViolation) Code() string {
368	1	return v.code
369		}
370
371		func (v internalViolation) Message() string {
372	1	return v.message
373		}
374
375		func (v internalViolation) MessageTemplate() string {
376		return v.messageTemplate
377		}
378
379		func (v internalViolation) Parameters() []TemplateParameter {
380		return v.parameters
381		}
382
383		func (v internalViolation) PropertyPath() *PropertyPath {
384	1	return v.propertyPath
385		}
386
387		func (v internalViolation) MarshalJSON() ([]byte, error) {
388	1	return json.Marshal(struct {
389		Code string `json:"code"`
390		Message string `json:"message"`
391		PropertyPath *PropertyPath `json:"propertyPath,omitempty"`
392		}{
393		Code: v.code,
394		Message: v.message,
395		PropertyPath: v.propertyPath,
396		})
397		}
398
399		type internalViolationFactory struct {
400		translator *Translator
401		}
402
403		func newViolationFactory(translator Translator) internalViolationFactory {
404	1	return &internalViolationFactory{translator: translator}
405		}
406
407		func (factory *internalViolationFactory) CreateViolation(
408		code,
409		messageTemplate string,
410		pluralCount int,
411		parameters []TemplateParameter,
412		propertyPath *PropertyPath,
413		lang language.Tag,
414		) Violation {
415	1	message := factory.translator.translate(lang, messageTemplate, pluralCount)
416
417	1	return &internalViolation{
418		code: code,
419		message: renderMessage(message, parameters),
420		messageTemplate: messageTemplate,
421		parameters: parameters,
422		propertyPath: propertyPath,
423		}
424		}
425
426		// ViolationBuilder used to build an instance of a Violation.
427		type ViolationBuilder struct {
428		code string
429		messageTemplate string
430		pluralCount int
431		parameters []TemplateParameter
432		propertyPath *PropertyPath
433		language language.Tag
434
435		violationFactory ViolationFactory
436		}
437
438		// NewViolationBuilder creates a new ViolationBuilder.
439		func NewViolationBuilder(factory ViolationFactory) *ViolationBuilder {
440	1	return &ViolationBuilder{violationFactory: factory}
441		}
442
443		// BuildViolation creates a new ViolationBuilder for composing Violation object fluently.
444		func (b ViolationBuilder) BuildViolation(code, message string) ViolationBuilder {
445	1	return &ViolationBuilder{
446		code: code,
447		messageTemplate: message,
448		violationFactory: b.violationFactory,
449		}
450		}
451
452		// SetParameters sets template parameters that can be injected into the violation message.
453		func (b ViolationBuilder) SetParameters(parameters ...TemplateParameter) ViolationBuilder {
454	1	b.parameters = parameters
455
456	1	return b
457		}
458
459		// AddParameter adds one parameter into a slice of parameters.
460		func (b ViolationBuilder) AddParameter(name, value string) ViolationBuilder {
461	1	b.parameters = append(b.parameters, TemplateParameter{Key: name, Value: value})
462
463	1	return b
464		}
465
466		// SetPropertyPath sets a property path of violated attribute.
467		func (b ViolationBuilder) SetPropertyPath(path PropertyPath) *ViolationBuilder {
468	1	b.propertyPath = path
469
470	1	return b
471		}
472
473		// SetPluralCount sets a plural number that will be used for message pluralization during translations.
474		func (b ViolationBuilder) SetPluralCount(pluralCount int) ViolationBuilder {
475	1	b.pluralCount = pluralCount
476
477	1	return b
478		}
479
480		// SetLanguage sets language that will be used to translate the violation message.
481		func (b ViolationBuilder) SetLanguage(tag language.Tag) ViolationBuilder {
482	1	b.language = tag
483
484	1	return b
485		}
486
487		// CreateViolation creates a new violation with given parameters and returns it.
488		// Violation is created by calling the CreateViolation method of the ViolationFactory.
489		func (b *ViolationBuilder) CreateViolation() Violation {
490	1	return b.violationFactory.CreateViolation(
491		b.code,
492		b.messageTemplate,
493		b.pluralCount,
494		b.parameters,
495		b.propertyPath,
496		b.language,
497		)
498		}
499

muonsoft / validation

Pull Request — main (#52)

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