validation.ConditionalConstraint.SetUp - Code Metrics - Inspection of "Compound constraint" - muonsoft/validation - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — main (#54)

by Rushan

created 2021-05-31 19:52 UTC

validation.ConditionalConstraint.SetUp A

↳ Parent: contraint.go

Complexity

Conditions

Size

Total Lines	6
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	6
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
}

// 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 {
	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
}

func (c SequentialConstraint) validate(
	scope Scope,
	validate ValidateByConstraintFunc,
) (*ViolationList, error) {
	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 {
	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
}

func (c AtLeastOneOfConstraint) validate(
	scope Scope,
	validate ValidateByConstraintFunc,
) (*ViolationList, error) {
	violations := &ViolationList{}

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

		if violations.len == 0 {
			return violations, nil
		}
	}

	return violations, nil
}

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

// NewCompoundConstraint function used to create set of reusable constraints.
// If the list is empty error will be returned.
func NewCompoundConstraint(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
}

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

muonsoft / validation

Pull Request — main (#54)

validation.ConditionalConstraint.SetUp A

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