org.apache.tapestry5
Interface Translator<T>

Type Parameters:

T -

All Known Implementing Classes:

AbstractTranslator, NumericTranslator, StringTranslator

public interface Translator<T>

Translates between client-side and server-side values. Client-side values are always strings.

See Also:

TranslatorSource, FieldValidationSupport, FieldTranslator

Method Summary

String	getMessageKey() Returns the message key, within the application's global message catalog, normally used by this validator.
String	getName() Returns a unique name for the translator.
Class<T>	getType() Returns the type of the server-side value.
T	parseClient(Field field, String clientValue, String message) Converts a submitted request value into an appropriate server side value.
void	render(Field field, String message, MarkupWriter writer, FormSupport formSupport) Hook used by components to allow the validator to contribute additional attributes or (more often) client-side JavaScript (via the FormSupport.addValidation(Field, String, String, Object)).
String	toClient(T value) Converts a server-side value to a client-side string.

Method Detail

getName

String getName()

Returns a unique name for the translator. This is used to identify the translator by name, but is also used when locating override messages for the translator.

Returns:

unique name for the translator

toClient

String toClient(T value)

Converts a server-side value to a client-side string. This allows for formatting of the value in a way appropriate to the end user. The output client value should be parsable by parseClient(Field, String, String).

Parameters:

value - the server side value (which will not be null)

Returns:

client-side value to present to the user

getType

Class<T> getType()

Returns the type of the server-side value.

Returns:

a type

getMessageKey

String getMessageKey()

Returns the message key, within the application's global message catalog, normally used by this validator. This is used to provide the formatted message to parseClient(Field, String, String) or render(Field, String, MarkupWriter, org.apache.tapestry5.services.FormSupport).

Returns:

a message key

parseClient

T parseClient(Field field,
              String clientValue,
              String message)
              throws ValidationException

Converts a submitted request value into an appropriate server side value.

Parameters:

field - for which a value is being parsed

clientValue - to convert to a server value; this will not be null, but may be blank

message - formatted validation message, either from validation messages, or from an override

Returns:

equivalent server-side value (possibly null)

Throws:

ValidationException - if the value can not be parsed

render

void render(Field field,
            String message,
            MarkupWriter writer,
            FormSupport formSupport)

Hook used by components to allow the validator to contribute additional attributes or (more often) client-side JavaScript (via the FormSupport.addValidation(Field, String, String, Object)).

Parameters:

field - the field which is currently being rendered

message - formatted validation message, either from validation messages, or from an override

writer - markup writer, allowing additional attributes to be written into the active element

formSupport - used to add JavaScript