I haven't tried working with Struts 2's annotations for validation yet, so
I'm unable to answer this question. In a week, things might be different.
;-)
Matt
strutstwouser wrote:
>
> Hi Matt,
>
> Can you please tell me what's needed to use this validator using
> annotations alone? . Also, i need a simple conditional validator - ie a
> field needs to be validated only if a prerequisite condition is satisfied,
> else the validations on it must be skipped and no error must be added
> (since this is just a condition check).
>
> Example : if appname is to be validated only if appid < 100, i will give
> the inverse expression in ConditionalFieldValidator with shortCircuit true
> and the subsequent validations below it ; assumption being if the first
> condition becomes true (i.e prerequisite not satisfied), then dont
> validate further.
>
> The annotation i need would look like :
>
> @ConditionalFieldValidator(fieldName = "app.appname", expression =
> "app.appid > 100", message = "", shortCircuit=true)
> @StringLengthFieldValidator(fieldName = "app.appname" message = "App Name
> must be gt 5 chars", minLength = "5", maxLength = "12")
>
> I don't know how to make Struts 2 "see" this custom validator.
>
> Thanks,
> Joseph
>
>
>
> mraible wrote:
>>
>> I figured out how to do this - posting here so others will benefit.
>>
>> 1. Create a new ConditionalVisitorFieldValidator.java:
>>
>> public class ConditionalVisitorFieldValidator extends
>> VisitorFieldValidator
>> {
>> private String expression;
>>
>> public void setExpression(String expression)
>> {
>> this.expression = expression;
>> }
>>
>> public String getExpression()
>> {
>> return expression;
>> }
>>
>> /**
>> * If expression evaluates to true, invoke visitor validation.
>> * @param object the object being validated
>> * @throws ValidationException
>> */
>> public void validate(Object object) throws ValidationException
>> {
>> if (validateExpression(object))
>> {
>> super.validate(object);
>> }
>> }
>>
>> /**
>> * Validate the expression contained in the "expression" paramter.
>> * @param object the object you're validating
>> * @return true if expression evaluates to true (implying a validation
>> failure)
>> * @throws ValidationException if anything goes wrong
>> */
>> public boolean validateExpression(Object object) throws
>> ValidationException
>> {
>> Boolean answer = Boolean.FALSE;
>> Object obj = null;
>>
>> try
>> {
>> obj = getFieldValue(expression, object);
>> }
>> catch (ValidationException e)
>> {
>> throw e;
>> }
>> catch (Exception e)
>> {
>> // let this pass, but it will be logged right below
>> }
>>
>> if ((obj != null) && (obj instanceof Boolean))
>> {
>> answer = (Boolean) obj;
>> }
>> else
>> {
>> log.warn("Got result of " + obj + " when trying to get Boolean.");
>> }
>>
>> return answer;
>> }
>> }
>>
>> 2. Add it to your validators.xml:
>>
>> <validator name="conditionalvisitor"
>> class="com...validation.ConditionalVisitorFieldValidator"/>
>>
>> 3. Write your validation rule:
>>
>> <field name="colleaguePosition">
>> <field-validator type="fieldexpression" short-circuit="true">
>> reason == 'colleague' and colleaguePositionID == '_CHOOSE_'
>> <message>You must choose a position where you worked with this
>> person, or choose "Other..."</message>
>> </field-validator>
>> <field-validator type="conditionalvisitor">
>> reason == 'colleague' and colleaguePositionID == 'OTHER'
>> <message/>
>> </field-validator>
>> </field>
>>
>> Hope this helps,
>>
>> Matt
>>
>>
>> mraible wrote:
>>>
>>> I need to do something similar - is it possible to have conditional
>>> visitor validation in Struts 2? AFAICT, it isn't.
>>>
>>> Basically, I'd like to have a couple of validation rules for a
>>> drop-down. One rule is that the user must select at least one choice
>>> when the drop-down has its radio button selected:
>>>
>>> <field-validator type="fieldexpression" short-circuit="true">
>>> reason != 'partner' or (reason == 'partner' and
>>> partnerPositionID != '_CHOOSE_')
>>> <message>You must choose a position where you worked with this
>>> person, or choose "Other..."</message>
>>> </field-validator>
>>>
>>> This works. Now I want to require a number of fields if the person
>>> selects the "Other..." option. The validation syntax starts to get
>>> complicated at this point. I'd like to do something like:
>>>
>>> reason != 'partner' or (reason == 'partner' and partnerPositionID !=
>>> 'OTHER') -> kick in visitor validation.
>>>
>>> I still think the above syntax is confusing (ref
>>> http://tinyurl.com/2htw2k), I'd much rather write something like:
>>>
>>> reason == 'partner' and partnerPositionID == 'OTHER' -> show message
>>>
>>> I'm guessing it's possible to write my own FieldExpressionValidator that
>>> inverses the true/false outcome?
>>>
>>> Why do I need conditional visitor validation?
>>>
>>> I'm trying to create a "component" that can be re-used in the backend
>>> (model object w/ its own validation rules) and on the front-end (using
>>> JSP tag files or the s:component tag).
>>>
>>> If there's an easier way to do this, please let me know. Of course, I
>>> could use JSF/Wicket/Tapestry - and that might be the outcome if this is
>>> not possible.
>>>
>>> Thanks,
>>>
>>> Matt
>>>
>>>
>>> Sparecreative wrote:
>>>>
>>>> Is there a way to setup conditional validation through the
>>>> validation.xml
>>>> file?
>>>>
>>>> I'm currently user the visitor validator method where my core user
>>>> validation properties are in a User-validation.xml file. I want to be
>>>> able
>>>> to use this same file for all my user actions (register, add, update)
>>>> and
>>>> just have conditional code which looks a user field to determine
>>>> validation.
>>>>
>>>> At the moment I'm using a combination of the valididation.xml file and
>>>> the
>>>> validate method in the action.
>>>>
>>>> I know the following doesn't work, but can I have something like this:
>>>>
>>>> <!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator
>>>> 1.0.2//EN"
>>>> "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd";>
>>>> <validators>
>>>>
>>>> <validator type="expression">
>>>>
>>>> user.action.equals('insert') || user.action.equals('register')
>>>> <!-- only validate these fileds when inserting and registering a user
>>>> -->
>>>> <field name="user.password">
>>>> <field-validator type="requiredstring">
>>>> <message key="user.password.empty"/>
>>>> </field-validator>
>>>> </field>
>>>> <field name="user.confirmPassword">
>>>> <field-validator type="requiredstring">
>>>> <message key="user.confirmPassword.empty"/>
>>>> </field-validator>
>>>> </field>
>>>> </validator>
>>>> <!-- core validated fields -->
>>>> <field name="user.name">
>>>> <field-validator type="requiredstring">
>>>> <message key="user.name.empty">
>>>> resource not found</message>
>>>> </field-validator>
>>>> </field>
>>>> <field name="user.email">
>>>> <field-validator type="requiredstring"
>>>> short-circuit="true">
>>>> <message key="user.email.empty"/>
>>>> </field-validator>
>>>> <field-validator type="email">
>>>> <message key="user.email.invalid"/>
>>>> </field-validator>
>>>> </field>
>>>> <field name="user.phone">
>>>> <field-validator type="stringlength">
>>>> 10
>>>> <message key="user.phone.length"/>
>>>> </field-validator>
>>>> </field>
>>>> <field name="user.city">
>>>> <field-validator type="requiredstring">
>>>> <message key="user.city.empty"/>
>>>> </field-validator>
>>>> </field>
>>>>
>>>>
>>>>
>>>> Z.
>>>>
>>>>
>>>>
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>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>
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