Module constraint
ballerina/constraint Ballerina library
Overview
This module provides features to validate the values that have been assigned to Ballerina types.
The Ballerina constraint module facilitates APIs to do validations on the Ballerina types further with the use of annotations.
Functions
validate
function validate(anydata value, typedesc<anydata> td) returns td|ErrorValidates the provided value against the configured annotations. Additionally, if the type of the value is different from the expected return type then the value will be cloned with the contextually expected type before the validation.
Parameters
- value anydata - The
anydatatype value to be constrained
- td typedesc<anydata> (default <>) - The type descriptor of the value to be constrained
Return Type
- td|Error - The type descriptor of the value which is validated or else an
constraint:Errorin case of an error
Annotations
constraint: Array
type, record fieldThe annotation, which is used for the constraints of the anydata[] type.
constraint: Float
type, record fieldThe annotation, which is used for the constraints of the float type.
constraint: Int
type, record fieldThe annotation, which is used for the constraints of the int type.
constraint: Number
type, record fieldThe annotation, which is used for the constraints of the int, float, and decimal types.
constraint: String
type, record fieldThe annotation, which is used for the constraints of the string type.
Records
constraint: ArrayConstraints
Represents the constraints associated with anydata[] type.
Fields
- length int? - The number of members of the constrained type
- minLength int? - The inclusive lower bound of the number of members of the constrained type
- maxLength int? - The inclusive upper bound of the number of members of the constrained type
constraint: FloatConstraints
Represents the constraints associated with float type.
Fields
- minValue float? - The inclusive lower bound of the constrained type
- maxValue float? - The inclusive upper bound of the constrained type
- minValueExclusive float? - The exclusive lower bound of the constrained type
- maxValueExclusive float? - The exclusive upper bound of the constrained type
constraint: IntConstraints
Represents the constraints associated with int type.
Fields
- minValue int? - The inclusive lower bound of the constrained type
- maxValue int? - The inclusive upper bound of the constrained type
- minValueExclusive int? - The exclusive lower bound of the constrained type
- maxValueExclusive int? - The exclusive upper bound of the constrained type
constraint: NumberConstraints
Represents the constraints associated with int, float and decimal types.
Fields
- minValue decimal? - The inclusive lower bound of the constrained type
- maxValue decimal? - The inclusive upper bound of the constrained type
- minValueExclusive decimal? - The exclusive lower bound of the constrained type
- maxValueExclusive decimal? - The exclusive upper bound of the constrained type
constraint: StringConstraints
Represents the constraints associated with string type.
Fields
- length int? - The number of characters of the constrained
stringtype
- minLength int? - The inclusive lower bound of the number of characters of the constrained
stringtype
- maxLength int? - The inclusive upper bound of the number of characters of the constrained
stringtype
- pattern RegExp? - The regular expression to be matched with the constrained
stringtype