org.apache.tapestry5
Interface NullFieldStrategy

All Known Implementing Classes:

DefaultNullFieldStrategy, ZeroNullFieldStrategy

public interface NullFieldStrategy

Defines a strategy, used by Field components such as TextField, to handle the case where either the server-side value to be sent (as a string) to the client, or the client-side string passed back up to the server, is null or blank.

See Also:

NullFieldStrategySource

Method Summary

String	replaceFromClient() Provides a replacement value for a null or blank string passed from the client to the server as part of a form submission.
Object	replaceToClient() Provides a replacement value for null, when converting the server-side object to a client-side string.

Method Detail

replaceToClient

Object replaceToClient()

Provides a replacement value for null, when converting the server-side object to a client-side string. The replacement value, if non-null, will be passed to Translator.toClient(Object).

replaceFromClient

String replaceFromClient()

Provides a replacement value for a null or blank string passed from the client to the server as part of a form submission. This replacement value will be passed to Translator.parseClient(Field, String, String) as if it were the value supplied by the user.

Returns:

replacement value (this must not be null)