org.apache.tapestry5

## Interface FieldTranslator<T>

- All Known Implementing Classes:
    FieldTranslatorImpl

      public interface FieldTranslator<T>

  A wrapper around `Translator` that combines the translator for a specific `Field` and (sometimes) an override of the default validation message (used when an input value can't be parsed).

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `Class<T>` | `getType()` Returns the type of the server-side value.
    `T` | `parse(String input)` Invoked after the client-submitted value has been `translated` to check that the value conforms to expectations (often, in terms of minimum or maximum value).
    `void` | `render(MarkupWriter writer)` Invokes `Translator.render(Field, String, MarkupWriter,org.apache.tapestry5.services.FormSupport)`.
    `String` | `toClient(T value)` Converts a server-side value to a client-side string.

- - ### Method Detail

    - #### getType

          Class<T> getType()

      Returns the type of the server-side value.
      Returns:
        a type

    - #### parse

          T parse(String input)
           throws ValidationException

      Invoked after the client-submitted value has been `translated` to check that the value conforms to expectations (often, in terms of minimum or maximum value). If and only if the value is approved by all Validators is the value applied by the field.
      Throws:
        `ValidationException` - if the value violates the constraint

    - #### 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.
      Parameters:
        `value` - the server side value (which will not be null)
      Returns:
        client-side value to present to the user
      See Also:
        `Translator.toClient(Object)`

    - #### render

          void render(MarkupWriter writer)

      Invokes `Translator.render(Field, String, MarkupWriter,org.apache.tapestry5.services.FormSupport)`. This is called at a point "inside" the tag, so that additional attributes may be added. In many cases, the underlying `Validator` may write client-side JavaScript to enforce the constraint as well.
      Parameters:
        `writer` - markup writer to direct output to.
      See Also:
        `MarkupWriter.attributes(Object[])`

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