org.apache.tapestry5.internal.services
Class FieldValidatorImpl

java.lang.Object
  org.apache.tapestry5.internal.services.FieldValidatorImpl

All Implemented Interfaces:

FieldValidator

public class FieldValidatorImpl
extends Object
implements FieldValidator

Constructor Summary

FieldValidatorImpl(Field field, Object constraintValue, MessageFormatter messageFormatter, Validator validator, FormSupport formSupport)

Method Summary

boolean	isRequired() Returns true if any underlying Validator returns true from Validator.isRequired().
void	render(MarkupWriter writer) Invokes Validator.render(Field, Object, org.apache.tapestry5.ioc.MessageFormatter, MarkupWriter, org.apache.tapestry5.services.FormSupport).
void	validate(Object value) 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).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FieldValidatorImpl

public FieldValidatorImpl(Field field,
                          Object constraintValue,
                          MessageFormatter messageFormatter,
                          Validator validator,
                          FormSupport formSupport)

Method Detail

validate

public void validate(Object value)
              throws ValidationException

Description copied from interface: FieldValidator

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.

Specified by:

validate in interface FieldValidator

Parameters:

value - the translated value supplied by the user

Throws:

ValidationException - if the value violates the constraint

render

public void render(MarkupWriter writer)

Description copied from interface: FieldValidator

Invokes Validator.render(Field, Object, org.apache.tapestry5.ioc.MessageFormatter, 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.

Specified by:

render in interface FieldValidator

Parameters:

writer - markup writer to direct output to.

See Also:

MarkupWriter.attributes(Object[])

isRequired

public boolean isRequired()

Description copied from interface: FieldValidator

Returns true if any underlying Validator returns true from Validator.isRequired().

Specified by:

isRequired in interface FieldValidator

Returns:

true if the field is required (a non-blank value is expected)