Java Community | Help. Code. Learn.•2y ago

help with custom validator

hey guys. can smb help me out with writing my won validation annotation? i have entity

Payment

Payment

Payment

Payment and DTO

PaymentDTO

PaymentDTO

PaymentDTO

PaymentDTO and they have

private BigDecimal amount

private BigDecimal amount

private BigDecimal amount

private BigDecimal amount field. i want to validate it bc i want this field's length to be 7 positions at maximum. so far i have this:

@Documented
@Constraint(validatedBy = AmountValidator.class)
@Target( { ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface AmountConstraint {
    String message() default "Invalid amount";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

@Documented
@Constraint(validatedBy = AmountValidator.class)
@Target( { ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface AmountConstraint {
    String message() default "Invalid amount";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

@Documented
@Constraint(validatedBy = AmountValidator.class)
@Target( { ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface AmountConstraint {
    String message() default "Invalid amount";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

@Documented
@Constraint(validatedBy = AmountValidator.class)
@Target( { ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface AmountConstraint {
    String message() default "Invalid amount";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

public class AmountValidator implements ConstraintValidator<AmountConstraint, ???> {
    @Override
    public void initialize(AmountConstraint amountConstraint){}

    @Override
    public boolean isValid(BigDecimal amountField, ConstraintValidatorContext constraintValidatorContext) {
        boolean result= amountField!=null&& fields max length is less than 7 positions
        return result;
    }
}

public class AmountValidator implements ConstraintValidator<AmountConstraint, ???> {
    @Override
    public void initialize(AmountConstraint amountConstraint){}

    @Override
    public boolean isValid(BigDecimal amountField, ConstraintValidatorContext constraintValidatorContext) {
        boolean result= amountField!=null&& fields max length is less than 7 positions
        return result;
    }
}

public class AmountValidator implements ConstraintValidator<AmountConstraint, ???> {
    @Override
    public void initialize(AmountConstraint amountConstraint){}

    @Override
    public boolean isValid(BigDecimal amountField, ConstraintValidatorContext constraintValidatorContext) {
        boolean result= amountField!=null&& fields max length is less than 7 positions
        return result;
    }
}

public class AmountValidator implements ConstraintValidator<AmountConstraint, ???> {
    @Override
    public void initialize(AmountConstraint amountConstraint){}

    @Override
    public boolean isValid(BigDecimal amountField, ConstraintValidatorContext constraintValidatorContext) {
        boolean result= amountField!=null&& fields max length is less than 7 positions
        return result;
    }
}

what to write instead of
```
???
```
???
```
???
```
???
in my
```
AmountValidator
```
AmountValidator
```
AmountValidator
```
AmountValidator
? should it be data type of my field? i.e.
```
BigDecimal
```
BigDecimal
```
BigDecimal
```
BigDecimal
?
how to check if my field's max length is less than 7 positions in
```
isValid
```
isValid
```
isValid
```
isValid
method in the
```
AmountValidator
```
AmountValidator
```
AmountValidator
```
AmountValidator
?
thanks in advance.

help with custom validator

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