validation.SequentialConstraint.SetUp - Code Metrics - Inspection of "when-for-constraints" - muonsoft/validation - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — main (#63)

by Igor

created 2021-12-04 19:00 UTC

validation.SequentialConstraint.SetUp A

↳ Parent: contraint.go

Complexity

Conditions

Size

Total Lines	5
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
eloc	4
nop	0
dl	0
loc	5
rs	10
c	0
b	0
f	0
ccs	3
cts	3
cp	1
crap	2

package validation

import (
	"github.com/muonsoft/validation/code"
	"github.com/muonsoft/validation/generic"
	"github.com/muonsoft/validation/message"

	"time"
)

// Constraint is the base interface to build validation constraints.
type Constraint interface {
	Option
	// Name is a constraint name that can be used in internal errors.
	Name() string
}

// NilConstraint is used for constraints that need to check value for nil. In common case
// you do not need to implement it in your constraints because nil values should be ignored.
type NilConstraint interface {
	Constraint
	ValidateNil(scope Scope) error
}

// BoolConstraint is used to build constraints for boolean values validation.
type BoolConstraint interface {
	Constraint
	ValidateBool(value *bool, scope Scope) error
}

// NumberConstraint is used to build constraints for numeric values validation.
//
// At this moment working with numbers is based on reflection.
// Be aware. This constraint is subject to be changed after generics implementation in Go.
type NumberConstraint interface {
	Constraint
	ValidateNumber(value generic.Number, scope Scope) error
}

// StringConstraint is used to build constraints for string values validation.
type StringConstraint interface {
	Constraint
	ValidateString(value *string, scope Scope) error
}

// StringsConstraint is used to build constraints to validate an array or a slice of strings.
type StringsConstraint interface {
	Constraint
	ValidateStrings(values []string, scope Scope) error
}

// IterableConstraint is used to build constraints for validation of iterables (arrays, slices, or maps).
//
// At this moment working with numbers is based on reflection.
// Be aware. This constraint is subject to be changed after generics implementation in Go.
type IterableConstraint interface {
	Constraint
	ValidateIterable(value generic.Iterable, scope Scope) error
}

// CountableConstraint is used to build constraints for simpler validation of iterable elements count.
type CountableConstraint interface {
	Constraint
	ValidateCountable(count int, scope Scope) error
}

// TimeConstraint is used to build constraints for date/time validation.
type TimeConstraint interface {
	Constraint
	ValidateTime(value *time.Time, scope Scope) error
}

type controlConstraint interface {
	validate(scope Scope, validate ValidateByConstraintFunc) (*ViolationList, error)
}

// CustomStringConstraint can be used to create custom constraints for validating string values
// based on function with signature func(string) bool.
type CustomStringConstraint struct {
	isIgnored         bool
	isValid           func(string) bool
	name              string
	code              string
	messageTemplate   string
	messageParameters TemplateParameterList
}

// NewCustomStringConstraint creates a new string constraint from a function with signature func(string) bool.
// Optional parameters can be used to set up constraint name (first parameter), violation code (second),
// message template (third). All other parameters are ignored.
func NewCustomStringConstraint(isValid func(string) bool, parameters ...string) CustomStringConstraint {
	constraint := CustomStringConstraint{
		isValid:         isValid,
		name:            "CustomStringConstraint",
		code:            code.NotValid,
		messageTemplate: message.NotValid,
	}

	if len(parameters) > 0 {
		constraint.name = parameters[0]
	}
	if len(parameters) > 1 {
		constraint.code = parameters[1]
	}
	if len(parameters) > 2 {
		constraint.messageTemplate = parameters[2]
	}

	return constraint
}

// SetUp always returns no error.
func (c CustomStringConstraint) SetUp() error {
	return nil
}

// Name is the constraint name. It can be set via first parameter of function NewCustomStringConstraint.
func (c CustomStringConstraint) Name() string {
	return c.name
}

// Code overrides default code for produced violation.
func (c CustomStringConstraint) Code(code string) CustomStringConstraint {
	c.code = code
	return c
}

// Message sets the violation message template. You can set custom template parameters
// for injecting its values into the final message. Also, you can use default parameters:
//
//	{{ value }} - the current (invalid) value.
func (c CustomStringConstraint) Message(template string, parameters ...TemplateParameter) CustomStringConstraint {
	c.messageTemplate = template
	c.messageParameters = parameters
	return c
}

// When enables conditional validation of this constraint. If the expression evaluates to false,
// then the constraint will be ignored.
func (c CustomStringConstraint) When(condition bool) CustomStringConstraint {
	c.isIgnored = !condition
	return c
}

func (c CustomStringConstraint) ValidateString(value *string, scope Scope) error {
	if c.isIgnored || value == nil || *value == "" || c.isValid(*value) {
		return nil
	}

	return scope.BuildViolation(c.code, c.messageTemplate).
		SetParameters(
			c.messageParameters.Prepend(
				TemplateParameter{Key: "{{ value }}", Value: *value},
			)...,
		).
		AddParameter("{{ value }}", *value).
		CreateViolation()
}

// ConditionalConstraint is used for conditional validation.
// Use the When function to initiate a conditional check.
// If the condition is true, then the constraints passed through the Then function will be applied.
// Otherwise, the constraints passed through the Else function will apply.
type ConditionalConstraint struct {
	condition       bool
	thenConstraints []Constraint
	elseConstraints []Constraint
}

// When function is used to initiate conditional validation.
// If the condition is true, then the constraints passed through the Then function will be applied.
// Otherwise, the constraints passed through the Else function will apply.
func When(condition bool) ConditionalConstraint {
	return ConditionalConstraint{condition: condition}
}

// Then function is used to set a sequence of constraints to be applied if the condition is true.
// If the list is empty error will be returned.
func (c ConditionalConstraint) Then(constraints ...Constraint) ConditionalConstraint {
	c.thenConstraints = constraints
	return c
}

// Else function is used to set a sequence of constraints to be applied if a condition is false.
func (c ConditionalConstraint) Else(constraints ...Constraint) ConditionalConstraint {
	c.elseConstraints = constraints
	return c
}

// Name is the constraint name.
func (c ConditionalConstraint) Name() string {
	return "ConditionalConstraint"
}

// SetUp will return an error if Then function did not set any constraints.
func (c ConditionalConstraint) SetUp() error {
	if len(c.thenConstraints) == 0 {
		return errThenBranchNotSet
	}

	return nil
}

func (c ConditionalConstraint) validate(
	scope Scope,
	validate ValidateByConstraintFunc,
) (*ViolationList, error) {
	violations := &ViolationList{}
	var constraints []Constraint

	if c.condition {
		constraints = c.thenConstraints
	} else {
		constraints = c.elseConstraints
	}

	for _, constraint := range constraints {
		err := violations.AppendFromError(validate(constraint, scope))
		if err != nil {
			return nil, err
		}
	}

	return violations, nil
}

// SequentialConstraint is used to set constraints allowing to interrupt the validation once
// the first violation is raised.
type SequentialConstraint struct {
	isIgnored   bool
	constraints []Constraint
}

// Sequentially function used to set of constraints that should be validated step-by-step.
// If the list is empty error will be returned.
func Sequentially(constraints ...Constraint) SequentialConstraint {
	return SequentialConstraint{constraints: constraints}
}

// Name is the constraint name.
func (c SequentialConstraint) Name() string {
	return "SequentialConstraint"
}

// SetUp will return an error if the list of constraints is empty.
func (c SequentialConstraint) SetUp() error {
	if len(c.constraints) == 0 {
		return errSequentiallyConstraintsNotSet
	}
	return nil
}

// When enables conditional validation of this constraint. If the expression evaluates to false,
// then the constraint will be ignored.
func (c SequentialConstraint) When(condition bool) SequentialConstraint {
	c.isIgnored = !condition
	return c
}

func (c SequentialConstraint) validate(
	scope Scope,
	validate ValidateByConstraintFunc,
) (*ViolationList, error) {
	if c.isIgnored {
		return nil, nil
	}

	violations := &ViolationList{}

	for _, constraint := range c.constraints {
		err := violations.AppendFromError(validate(constraint, scope))
		if err != nil {
			return nil, err
		} else if violations.len > 0 {
			return violations, nil
		}
	}

	return violations, nil
}

// AtLeastOneOfConstraint is used to set constraints allowing checks that the value satisfies
// at least one of the given constraints.
// The validation stops as soon as one constraint is satisfied.
type AtLeastOneOfConstraint struct {
	isIgnored   bool
	constraints []Constraint
}

// AtLeastOneOf function used to set of constraints that the value satisfies at least one of the given constraints.
// If the list is empty error will be returned.
func AtLeastOneOf(constraints ...Constraint) AtLeastOneOfConstraint {
	return AtLeastOneOfConstraint{constraints: constraints}
}

// Name is the constraint name.
func (c AtLeastOneOfConstraint) Name() string {
	return "AtLeastOneOfConstraint"
}

// SetUp will return an error if the list of constraints is empty.
func (c AtLeastOneOfConstraint) SetUp() error {
	if len(c.constraints) == 0 {
		return errAtLeastOneOfConstraintsNotSet
	}
	return nil
}

// When enables conditional validation of this constraint. If the expression evaluates to false,
// then the constraint will be ignored.
func (c AtLeastOneOfConstraint) When(condition bool) AtLeastOneOfConstraint {
	c.isIgnored = !condition
	return c
}

func (c AtLeastOneOfConstraint) validate(
	scope Scope,
	validate ValidateByConstraintFunc,
) (*ViolationList, error) {
	if c.isIgnored {
		return nil, nil
	}

	violations := &ViolationList{}

	for _, constraint := range c.constraints {
		violation := validate(constraint, scope)
		if violation == nil {
			return nil, nil
		}

		err := violations.AppendFromError(violation)
		if err != nil {
			return nil, err
		}
	}

	return violations, nil
}

// CompoundConstraint is used to create your own set of reusable constraints, representing rules to use consistently.
type CompoundConstraint struct {
	isIgnored   bool
	constraints []Constraint
}

// Compound function used to create set of reusable constraints.
// If the list is empty error will be returned.
func Compound(constraints ...Constraint) CompoundConstraint {
	return CompoundConstraint{constraints: constraints}
}

// Name is the constraint name.
func (c CompoundConstraint) Name() string {
	return "CompoundConstraint"
}

// SetUp will return an error if the list of constraints is empty.
func (c CompoundConstraint) SetUp() error {
	if len(c.constraints) == 0 {
		return errCompoundConstraintsNotSet
	}
	return nil
}

// When enables conditional validation of this constraint. If the expression evaluates to false,
// then the constraint will be ignored.
func (c CompoundConstraint) When(condition bool) CompoundConstraint {
	c.isIgnored = !condition
	return c
}

func (c CompoundConstraint) validate(
	scope Scope,
	validate ValidateByConstraintFunc,
) (*ViolationList, error) {
	if c.isIgnored {
		return nil, nil
	}

	violations := &ViolationList{}

	for _, constraint := range c.constraints {
		err := violations.AppendFromError(validate(constraint, scope))
		if err != nil {
			return nil, err
		}
	}

	return violations, nil
}

type notFoundConstraint struct {
	key string
}

func (c notFoundConstraint) SetUp() error {
	return ConstraintNotFoundError{Key: c.key}
}

func (c notFoundConstraint) Name() string {
	return "notFoundConstraint"
}


1		package validation
2
3		import (
4		"github.com/muonsoft/validation/code"
5		"github.com/muonsoft/validation/generic"
6		"github.com/muonsoft/validation/message"
7
8		"time"
9		)
10
11		// Constraint is the base interface to build validation constraints.
12		type Constraint interface {
13		Option
14		// Name is a constraint name that can be used in internal errors.
15		Name() string
16		}
17
18		// NilConstraint is used for constraints that need to check value for nil. In common case
19		// you do not need to implement it in your constraints because nil values should be ignored.
20		type NilConstraint interface {
21		Constraint
22		ValidateNil(scope Scope) error
23		}
24
25		// BoolConstraint is used to build constraints for boolean values validation.
26		type BoolConstraint interface {
27		Constraint
28		ValidateBool(value *bool, scope Scope) error
29		}
30
31		// NumberConstraint is used to build constraints for numeric values validation.
32		//
33		// At this moment working with numbers is based on reflection.
34		// Be aware. This constraint is subject to be changed after generics implementation in Go.
35		type NumberConstraint interface {
36		Constraint
37		ValidateNumber(value generic.Number, scope Scope) error
38		}
39
40		// StringConstraint is used to build constraints for string values validation.
41		type StringConstraint interface {
42		Constraint
43		ValidateString(value *string, scope Scope) error
44		}
45
46		// StringsConstraint is used to build constraints to validate an array or a slice of strings.
47		type StringsConstraint interface {
48		Constraint
49		ValidateStrings(values []string, scope Scope) error
50		}
51
52		// IterableConstraint is used to build constraints for validation of iterables (arrays, slices, or maps).
53		//
54		// At this moment working with numbers is based on reflection.
55		// Be aware. This constraint is subject to be changed after generics implementation in Go.
56		type IterableConstraint interface {
57		Constraint
58		ValidateIterable(value generic.Iterable, scope Scope) error
59		}
60
61		// CountableConstraint is used to build constraints for simpler validation of iterable elements count.
62		type CountableConstraint interface {
63		Constraint
64		ValidateCountable(count int, scope Scope) error
65		}
66
67		// TimeConstraint is used to build constraints for date/time validation.
68		type TimeConstraint interface {
69		Constraint
70		ValidateTime(value *time.Time, scope Scope) error
71		}
72
73		type controlConstraint interface {
74		validate(scope Scope, validate ValidateByConstraintFunc) (*ViolationList, error)
75		}
76
77		// CustomStringConstraint can be used to create custom constraints for validating string values
78		// based on function with signature func(string) bool.
79		type CustomStringConstraint struct {
80		isIgnored bool
81		isValid func(string) bool
82		name string
83		code string
84		messageTemplate string
85		messageParameters TemplateParameterList
86		}
87
88		// NewCustomStringConstraint creates a new string constraint from a function with signature func(string) bool.
89		// Optional parameters can be used to set up constraint name (first parameter), violation code (second),
90		// message template (third). All other parameters are ignored.
91		func NewCustomStringConstraint(isValid func(string) bool, parameters ...string) CustomStringConstraint {
92	1	constraint := CustomStringConstraint{
93		isValid: isValid,
94		name: "CustomStringConstraint",
95		code: code.NotValid,
96		messageTemplate: message.NotValid,
97		}
98
99	1	if len(parameters) > 0 {
100	1	constraint.name = parameters[0]
101		}
102	1	if len(parameters) > 1 {
103	1	constraint.code = parameters[1]
104		}
105	1	if len(parameters) > 2 {
106	1	constraint.messageTemplate = parameters[2]
107		}
108
109	1	return constraint
110		}
111
112		// SetUp always returns no error.
113		func (c CustomStringConstraint) SetUp() error {
114	1	return nil
115		}
116
117		// Name is the constraint name. It can be set via first parameter of function NewCustomStringConstraint.
118		func (c CustomStringConstraint) Name() string {
119	1	return c.name
120		}
121
122		// Code overrides default code for produced violation.
123		func (c CustomStringConstraint) Code(code string) CustomStringConstraint {
124	1	c.code = code
125	1	return c
126		}
127
128		// Message sets the violation message template. You can set custom template parameters
129		// for injecting its values into the final message. Also, you can use default parameters:
130		//
131		// {{ value }} - the current (invalid) value.
132		func (c CustomStringConstraint) Message(template string, parameters ...TemplateParameter) CustomStringConstraint {
133	1	c.messageTemplate = template
134	1	c.messageParameters = parameters
135	1	return c
136		}
137
138		// When enables conditional validation of this constraint. If the expression evaluates to false,
139		// then the constraint will be ignored.
140		func (c CustomStringConstraint) When(condition bool) CustomStringConstraint {
141	1	c.isIgnored = !condition
142	1	return c
143		}
144
145		func (c CustomStringConstraint) ValidateString(value *string, scope Scope) error {
146	1	if c.isIgnored \|\| value == nil \|\| value == "" \|\| c.isValid(value) {
147	1	return nil
148		}
149
150	1	return scope.BuildViolation(c.code, c.messageTemplate).
151		SetParameters(
152		c.messageParameters.Prepend(
153		TemplateParameter{Key: "{{ value }}", Value: *value},
154		)...,
155		).
156		AddParameter("{{ value }}", *value).
157		CreateViolation()
158		}
159
160		// ConditionalConstraint is used for conditional validation.
161		// Use the When function to initiate a conditional check.
162		// If the condition is true, then the constraints passed through the Then function will be applied.
163		// Otherwise, the constraints passed through the Else function will apply.
164		type ConditionalConstraint struct {
165		condition bool
166		thenConstraints []Constraint
167		elseConstraints []Constraint
168		}
169
170		// When function is used to initiate conditional validation.
171		// If the condition is true, then the constraints passed through the Then function will be applied.
172		// Otherwise, the constraints passed through the Else function will apply.
173		func When(condition bool) ConditionalConstraint {
174	1	return ConditionalConstraint{condition: condition}
175		}
176
177		// Then function is used to set a sequence of constraints to be applied if the condition is true.
178		// If the list is empty error will be returned.
179		func (c ConditionalConstraint) Then(constraints ...Constraint) ConditionalConstraint {
180	1	c.thenConstraints = constraints
181	1	return c
182		}
183
184		// Else function is used to set a sequence of constraints to be applied if a condition is false.
185		func (c ConditionalConstraint) Else(constraints ...Constraint) ConditionalConstraint {
186	1	c.elseConstraints = constraints
187	1	return c
188		}
189
190		// Name is the constraint name.
191		func (c ConditionalConstraint) Name() string {
192	1	return "ConditionalConstraint"
193		}
194
195		// SetUp will return an error if Then function did not set any constraints.
196		func (c ConditionalConstraint) SetUp() error {
197	1	if len(c.thenConstraints) == 0 {
198	1	return errThenBranchNotSet
199		}
200
201	1	return nil
202		}
203
204		func (c ConditionalConstraint) validate(
205		scope Scope,
206		validate ValidateByConstraintFunc,
207		) (*ViolationList, error) {
208	1	violations := &ViolationList{}
209	1	var constraints []Constraint
210
211	1	if c.condition {
212	1	constraints = c.thenConstraints
213		} else {
214	1	constraints = c.elseConstraints
215		}
216
217	1	for _, constraint := range constraints {
218	1	err := violations.AppendFromError(validate(constraint, scope))
219	1	if err != nil {
220		return nil, err
221		}
222		}
223
224	1	return violations, nil
225		}
226
227		// SequentialConstraint is used to set constraints allowing to interrupt the validation once
228		// the first violation is raised.
229		type SequentialConstraint struct {
230		isIgnored bool
231		constraints []Constraint
232		}
233
234		// Sequentially function used to set of constraints that should be validated step-by-step.
235		// If the list is empty error will be returned.
236		func Sequentially(constraints ...Constraint) SequentialConstraint {
237	1	return SequentialConstraint{constraints: constraints}
238		}
239
240		// Name is the constraint name.
241		func (c SequentialConstraint) Name() string {
242	1	return "SequentialConstraint"
243		}
244
245		// SetUp will return an error if the list of constraints is empty.
246		func (c SequentialConstraint) SetUp() error {
247	1	if len(c.constraints) == 0 {
248	1	return errSequentiallyConstraintsNotSet
249		}
250	1	return nil
251		}
252
253		// When enables conditional validation of this constraint. If the expression evaluates to false,
254		// then the constraint will be ignored.
255		func (c SequentialConstraint) When(condition bool) SequentialConstraint {
256	1	c.isIgnored = !condition
257	1	return c
258		}
259
260		func (c SequentialConstraint) validate(
261		scope Scope,
262		validate ValidateByConstraintFunc,
263		) (*ViolationList, error) {
264	1	if c.isIgnored {
265	1	return nil, nil
266		}
267
268	1	violations := &ViolationList{}
269
270	1	for _, constraint := range c.constraints {
271	1	err := violations.AppendFromError(validate(constraint, scope))
272	1	if err != nil {
273		return nil, err
274	1	} else if violations.len > 0 {
275	1	return violations, nil
276		}
277		}
278
279		return violations, nil
280		}
281
282		// AtLeastOneOfConstraint is used to set constraints allowing checks that the value satisfies
283		// at least one of the given constraints.
284		// The validation stops as soon as one constraint is satisfied.
285		type AtLeastOneOfConstraint struct {
286		isIgnored bool
287		constraints []Constraint
288		}
289
290		// AtLeastOneOf function used to set of constraints that the value satisfies at least one of the given constraints.
291		// If the list is empty error will be returned.
292		func AtLeastOneOf(constraints ...Constraint) AtLeastOneOfConstraint {
293	1	return AtLeastOneOfConstraint{constraints: constraints}
294		}
295
296		// Name is the constraint name.
297		func (c AtLeastOneOfConstraint) Name() string {
298	1	return "AtLeastOneOfConstraint"
299		}
300
301		// SetUp will return an error if the list of constraints is empty.
302		func (c AtLeastOneOfConstraint) SetUp() error {
303	1	if len(c.constraints) == 0 {
304	1	return errAtLeastOneOfConstraintsNotSet
305		}
306	1	return nil
307		}
308
309		// When enables conditional validation of this constraint. If the expression evaluates to false,
310		// then the constraint will be ignored.
311		func (c AtLeastOneOfConstraint) When(condition bool) AtLeastOneOfConstraint {
312	1	c.isIgnored = !condition
313	1	return c
314		}
315
316		func (c AtLeastOneOfConstraint) validate(
317		scope Scope,
318		validate ValidateByConstraintFunc,
319		) (*ViolationList, error) {
320	1	if c.isIgnored {
321	1	return nil, nil
322		}
323
324	1	violations := &ViolationList{}
325
326	1	for _, constraint := range c.constraints {
327	1	violation := validate(constraint, scope)
328	1	if violation == nil {
329	1	return nil, nil
330		}
331
332	1	err := violations.AppendFromError(violation)
333	1	if err != nil {
334		return nil, err
335		}
336		}
337
338	1	return violations, nil
339		}
340
341		// CompoundConstraint is used to create your own set of reusable constraints, representing rules to use consistently.
342		type CompoundConstraint struct {
343		isIgnored bool
344		constraints []Constraint
345		}
346
347		// Compound function used to create set of reusable constraints.
348		// If the list is empty error will be returned.
349		func Compound(constraints ...Constraint) CompoundConstraint {
350	1	return CompoundConstraint{constraints: constraints}
351		}
352
353		// Name is the constraint name.
354		func (c CompoundConstraint) Name() string {
355	1	return "CompoundConstraint"
356		}
357
358		// SetUp will return an error if the list of constraints is empty.
359		func (c CompoundConstraint) SetUp() error {
360	1	if len(c.constraints) == 0 {
361	1	return errCompoundConstraintsNotSet
362		}
363	1	return nil
364		}
365
366		// When enables conditional validation of this constraint. If the expression evaluates to false,
367		// then the constraint will be ignored.
368		func (c CompoundConstraint) When(condition bool) CompoundConstraint {
369	1	c.isIgnored = !condition
370	1	return c
371		}
372
373		func (c CompoundConstraint) validate(
374		scope Scope,
375		validate ValidateByConstraintFunc,
376		) (*ViolationList, error) {
377	1	if c.isIgnored {
378	1	return nil, nil
379		}
380
381	1	violations := &ViolationList{}
382
383	1	for _, constraint := range c.constraints {
384	1	err := violations.AppendFromError(validate(constraint, scope))
385	1	if err != nil {
386		return nil, err
387		}
388		}
389
390	1	return violations, nil
391		}
392
393		type notFoundConstraint struct {
394		key string
395		}
396
397		func (c notFoundConstraint) SetUp() error {
398	1	return ConstraintNotFoundError{Key: c.key}
399		}
400
401		func (c notFoundConstraint) Name() string {
402	1	return "notFoundConstraint"
403		}
404

muonsoft / validation

Pull Request — main (#63)

validation.SequentialConstraint.SetUp A

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