org.apache.tapestry5
Interface FieldValidationSupport

All Known Implementing Classes:

FieldValidationSupportImpl

public interface FieldValidationSupport

Services to help with field validation and translation. This service encapsulates the logic that mixes normal configured/declared validation/translation with events triggered on the component.

Method Summary

Object	parseClient(String clientValue, ComponentResources componentResources, FieldTranslator<Object> translator, NullFieldStrategy nullFieldStrategy) A wrapper around Translator.parseClient(Field, String, String).
String	toClient(Object value, ComponentResources componentResources, FieldTranslator<Object> translator, NullFieldStrategy nullFieldStrategy) A wrapper around Translator.toClient(Object) that first fires a "toclient" event on the component to see if it can perform the conversion.
void	validate(Object value, ComponentResources componentResources, FieldValidator validator) Performs validation on a parsed value from the client.

Method Detail

toClient

String toClient(Object value,
                ComponentResources componentResources,
                FieldTranslator<Object> translator,
                NullFieldStrategy nullFieldStrategy)

A wrapper around Translator.toClient(Object) that first fires a "toclient" event on the component to see if it can perform the conversion. If the value is null, then no event is fired and the translator is not invoked, the return value is simply null.

Parameters:

value - to be converted to a client-side string, which may be null

componentResources - used to fire events on the component

translator - used if the component does not provide a non-null value

nullFieldStrategy - used to convert a null server side value to an appropriate client side value

Returns:

the translated value or null if the value is null

See Also:

Translator.toClient(Object)

parseClient

Object parseClient(String clientValue,
                   ComponentResources componentResources,
                   FieldTranslator<Object> translator,
                   NullFieldStrategy nullFieldStrategy)
                   throws ValidationException

A wrapper around Translator.parseClient(Field, String, String). First a "parseclient" event is fired; the translator is only invoked if that returns null (typically because there is no event handler method for the event).

Parameters:

clientValue - the value provided by the client (not null)

componentResources - used to trigger events

translator - translator that will do the work if the component event returns null

nullFieldStrategy - used to convert null/blank values from client into non-null server side values

Returns:

the input parsed to an object

Throws:

ValidationException - if the value can't be parsed

See Also:

Translator.parseClient(Field, String, String)

validate

void validate(Object value,
              ComponentResources componentResources,
              FieldValidator validator)
              throws ValidationException

Performs validation on a parsed value from the client. Normal validations occur first, then a "validate" event is triggered on the component.

Parameters:

value - parsed value from the client, possibly null

componentResources - used to trigger events

validator - performs normal validations

Throws:

ValidationException - if the value is not valid

See Also:

Validator.validate(Field, Object, org.apache.tapestry5.ioc.MessageFormatter, Object)