Module jakarta.validation

Package jakarta.validation

Interface ConstraintValidator<A extends Annotation,T>

Type Parameters:

A - the annotation type handled by an implementation

T - the target type supported by an implementation

public interface ConstraintValidator<A extends Annotation,T>

Defines the logic to validate a given constraint A for a given object type T.

Implementations must comply to the following restriction:

• T must resolve to a non parameterized type
• or generic parameters of T must be unbounded wildcard types

The annotation SupportedValidationTarget can be put on a ConstraintValidator implementation to mark it as supporting cross-parameter constraints. Check out SupportedValidationTarget and Constraint for more information.

Method Summary

Modifier and Type	Method	Description
default void	initialize(A constraintAnnotation)	Initializes the validator in preparation for isValid(Object, ConstraintValidatorContext) calls.
boolean	isValid(T value, ConstraintValidatorContext context)	Implements the validation logic.

Method Details

initialize

default void initialize(A constraintAnnotation)

Initializes the validator in preparation for isValid(Object, ConstraintValidatorContext) calls. The constraint annotation for a given constraint declaration is passed.

This method is guaranteed to be called before any use of this instance for validation.

The default implementation is a no-op.

Parameters:

constraintAnnotation - annotation instance for a given constraint declaration

isValid

boolean isValid(T value,
 ConstraintValidatorContext context)

Implements the validation logic. The state of value must not be altered.

This method can be accessed concurrently, thread-safety must be ensured by the implementation.

Parameters:

value - object to validate

context - context in which the constraint is evaluated

Returns:

false if value does not pass the constraint