Thank you for your posting. I already know how to use the
@FieldExpressionValidator and annotations at property level (on setter
methods) or how to use the validators with annotations at method level
(@Validations for an execute() method). But I did not get it work with the
@ExpressionValidator and conditional clauses. So let's say:
privatePerson is a boolean property. If privatePerson==true do some
validation and if privatePerson==false do some different validation. For
instance, if privatePerson==true I wanna use required string validators for
the field properties "name", "number1" and "number2". But if
privatePerson==false I wanna use only the field validator for "number1". But
I miss the conditional part.
@Validations(
requiredStrings = {
@RequiredStringValidator(type = ValidatorType.SIMPLE, fieldName =
"name", message = "You must enter a value for name."),
@RequiredStringValidator(type = ValidatorType.SIMPLE, fieldName =
"number1", message = "You must enter a value for number1."),
@RequiredStringValidator(type = ValidatorType.SIMPLE, fieldName =
"number2", message = "You must enter a value for number2.")
},
expressions = {
@ExpressionValidator(expression = "privatePerson", message="", key="")
}
)
public String execute() throws Exception {
return SUCCESS;
}
Greg Lindholm wrote:
>
> You can use @FieldExpressionValidator and @ExpressionValidator annotations
> which allow you to write complex conditions.
>
> Here is an example a plucked from my code:
>
> @FieldExpressionValidator(expression = "!create ||
> !password.trim().isEmpty()", message = "required", key =
> ERROR_PASSWORD_REQUIRED)
> public void setPassword(String password)
> {
> _password = password;
> }
>
> If the expression is false then the validation fails, so with reversed
> logic this says: if doing a create then password is required.
>
> IMHO, once you reach a certain level of complexity its much easier to
> write, debug, and test validation logic in java.
>
>
> Dirk Forchel wrote:
>>
>> Finally I followed your advice and use Java-based validation now. I did
>> not get it work with the expression validator via annotations. If
>> somebody knows how to do the following Java-based validation with
>> annotations just let me know:
>>
>> public void validate()
>> {
>> if (privatePerson)
>> {
>> if (GenericValidator.isBlankOrNull(name))
>> addFieldError("name", "name required");
>> if (GenericValidator.isBlankOrNull(number1))
>> addFieldError("number1", "number1 required");
>> else if (!(GenericValidator.isInt(number1) ||
>> GenericValidator.isInt(number2)))
>> addFieldError("number1", "The number can contain only digits.");
>> else if (!(GenericValidator.minLength(number1, 6) &&
>> GenericValidator.maxLength(number1, 6)))
>> addFieldError("number1", "The first part of the number must be 6
>> digits long.");
>> else if (!(GenericValidator.minLength(number2, 4) &&
>> GenericValidator.maxLength(number2, 4)))
>> addFieldError("number2", "The second part of the number must be
>> 4 digits long.");
>> }
>> else
>> {
>> if (GenericValidator.isBlankOrNull(number1))
>>
>> addFieldError("number1", "number required");
>> else if (!GenericValidator.isInt(number1))
>> addFieldError("number1", "The number can contain only digits.");
>> else if (!(GenericValidator.minLength(number1, 8) &&
>> GenericValidator.maxLength(number1, 8)))
>> addFieldError("number1", "The number must be 8 digits long.");
>> }
>> }
>>
>>
>>
>>
>> newton.dave wrote:
>>>
>>> AFAIK the expression validator is available via annotations. You can
>>> also use a custom validator but I find it a little clumsy with
>>> annotations.
>>>
>>> Personally, as soon as validation gets even remotely complicated I fall
>>> back to using Java-based validation--I just think it's easier to
>>> maintain and much more clear.
>>>
>>> I'll sometimes use a combination of both Java-based and either XML or
>>> annotations if it makes sense to.
>>>
>>> On a side note, IIRC the "trim" attribute/parameter only applies the
>>> trim during validation--not on the value set on the action property.
>>>
>>> Dave
>>>
>>> Dirk Forchel wrote:
>>>> I have two radio buttons for a form property named "privatePerson" with
>>>> two
>>>> possible values ('true' and 'false') which toogles the view of my input
>>>> form
>>>> with three different input fields (number1, number2, name).
>>>> If the user choose "private" the number1, number2 and name input fields
>>>> are
>>>> shown, if the user choose "non-private" only the number1 input field is
>>>> shown.
>>>> For the first choise I would use annotation based validation like
>>>>
>>>> @Validations(
>>>> requiredStrings = {...@requiredstringvalidator(type =
>>>> ValidatorType.SIMPLE,
>>>> fieldName = "name", message = "You must enter a name.")},
>>>> stringLengthFields = {...@stringlengthfieldvalidator(type =
>>>> ValidatorType.SIMPLE, trim = true, minLength="6", maxLength = "6",
>>>> fieldName
>>>> = "number1", message = "The first part of the number must be 6 digits
>>>> long."), @StringLengthFieldValidator(type = ValidatorType.SIMPLE, trim
>>>> =
>>>> true, minLength="4", maxLength = "4", fieldName = "number2", message =
>>>> "The
>>>> second part of the number must be 4 digits long."),
>>>> }
>>>> )
>>>> public String execute() throws Exception {
>>>> ...
>>>> }
>>>>
>>>> If the user selects "non-private" only the following validator should
>>>> be
>>>> used.
>>>>
>>>> @Validations(
>>>> stringLengthFields = {...@stringlengthfieldvalidator(type =
>>>> ValidatorType.SIMPLE, trim = true, minLength="8", maxLength = "8",
>>>> fieldName
>>>> = "number1", message = "The first part of the number must be 8 digits
>>>> long."),
>>>> }
>>>> )
>>>> public String execute() throws Exception {
>>>> ...
>>>> }
>>>>
>>>>
>>>> How can I accomplish this conditional annotation based validation?
>>>
>>>
>>>
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>>>
>>>
>>>
>>
>>
>
>
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