MBAttributeValidator Class Reference

Inherits from	NSObject
Declared in	MBAttributeValidator.h

Overview

MBAttributeValidator instances can be used to verify that a given MBDataModel contains an expected set of values.

`+ validatorForDataModel:`

Returns a new MBAttributeValidator to be used for validating the specified MBDataModel.

+ (nonnull instancetype)validatorForDataModel:(nonnull MBDataModel *)model

Parameters

`model`	The `MBDataModel` to be validated.

Return Value

An MBAttributeValidator that can be used to validate model.

Declared In

MBAttributeValidator.h

`model`

Returns the MBDataModel that the receiver was constructed to validate.

@property (nonnull, nonatomic, readonly) MBDataModel *model

Declared In

MBAttributeValidator.h

`validationErrorMessages`

Returns an array of NSStrings containing error messages for any problems encountered during validation. Will be nil if no validation errors have occurred.

@property (nullable, nonatomic, readonly) NSArray *validationErrorMessages

Declared In

MBAttributeValidator.h

`– require:or:`

Requires that the data model contain either attr1 or attr2 but not both.

- (BOOL)require:(nonnull NSString *)attr1 or:(nonnull NSString *)attr2

Parameters

`attr1`	The name of the first attribute.
`attr2`	The name of the second attribute.

Return Value

YES if the validation requirement was satisfied; NO otherwise.

Declared In

MBAttributeValidator.h

`– require:or:butNotBoth:`

Requires that the data model contain either attr1 or attr2.

- (BOOL)require:(nonnull NSString *)attr1 or:(nonnull NSString *)attr2 butNotBoth:(BOOL)onlyAllowOne

Parameters

`attr1`	The name of the first attribute.
`attr2`	The name of the second attribute.
`onlyAllowOne`	If `YES`, the requirement will be satisfied only if `attr1` or `attr2` exists but not both. If `NO`, the requirement will be satisfied if either `attr1` or `attr2` is present or if both are present.

Return Value

YES if the validation requirement was satisfied; NO otherwise.

Declared In

MBAttributeValidator.h

`– requireAtLeastOneOf:`

Requires at least one of a set of attribute names to be present in the data model. Validation will fail if none of the specified attributes are present.

- (BOOL)requireAtLeastOneOf:(nonnull NSObject<NSFastEnumeration> *)attrs

Parameters

`attrs`	An enumeration of `NSString`s representing the attribute names to validate.

Return Value

YES if the validation requirement was satisfied; NO otherwise.

Declared In

MBAttributeValidator.h

`– requireExactlyOneOf:`

Requires exactly one of a set of attribute names to be present in the data model. Validation will fail if none of the specified attributes are present, or if more than one is present.

- (BOOL)requireExactlyOneOf:(nonnull NSObject<NSFastEnumeration> *)attrs

Parameters

`attrs`	An enumeration of `NSString`s representing the attribute names to validate.

Return Value

YES if the validation requirement was satisfied; NO otherwise.

Declared In

MBAttributeValidator.h

`– validate`

Returns YES if all validation requirements were satisfied.

- (BOOL)validate

Return Value

YES if validation succeeded; NO otherwise.

Discussion

If validation did not succeed, the error messages contained in validationErrorMessages will be logged to the console.

Declared In

MBAttributeValidator.h