org.apache.tapestry.form.validator
Class AbstractValidatorWrapper

java.lang.Object
  org.apache.tapestry.form.validator.AbstractValidatorWrapper

All Implemented Interfaces:

FormComponentContributor, Validator

Direct Known Subclasses:

BeanValidatorWrapper

public abstract class AbstractValidatorWrapper
extends Object
implements Validator

Abstract implementation of Validator that delegates to some other object.

Since:

4.0

Author:

Howard Lewis Ship

Constructor Summary

AbstractValidatorWrapper()

Method Summary

boolean	getAcceptsNull() Returns true if this validator accepts null as the object parameter to validate().
protected abstract Validator	getDelegate()
boolean	isRequired() Returns true if this field is required.
void	renderContribution(IMarkupWriter writer, IRequestCycle cycle, FormComponentContributorContext context, IFormComponent field) Invoked by a form component after it finishes rendering its tag (but before the tag is closed) to allow this object to contribute to the component's rendering process.
void	validate(IFormComponent field, ValidationMessages messages, Object object) Invoked to validate input for the field.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractValidatorWrapper

public AbstractValidatorWrapper()

Method Detail

getDelegate

protected abstract Validator getDelegate()

validate

public void validate(IFormComponent field,
                     ValidationMessages messages,
                     Object object)
              throws ValidatorException

Description copied from interface: Validator

Invoked to validate input for the field. A Translator will have already converted the submitted user input string into an object.

Specified by:

validate in interface Validator

Parameters:

field - the form element component being validated, often used to determine the user presentable name for the field, used in error messages.

messages - access to the pre-defined validation messages, in the appropriate locale

object - the client-side representation of the field's data. May be null if the client did not provide a value for the field (most Validators should check for null and perform no check if null).

Throws:

ValidatorException - if the object violates the constraint represented by this Validator.

getAcceptsNull

public boolean getAcceptsNull()

Description copied from interface: Validator

Returns true if this validator accepts null as the object parameter to validate(). When the object is null, validators that can't accept null are skipped. It is rare for a validator to return true.

Specified by:

getAcceptsNull in interface Validator

isRequired

public boolean isRequired()

Description copied from interface: Validator

Returns true if this field is required. Returns false otherwise.

Specified by:

isRequired in interface Validator

renderContribution

public void renderContribution(IMarkupWriter writer,
                               IRequestCycle cycle,
                               FormComponentContributorContext context,
                               IFormComponent field)

Description copied from interface: FormComponentContributor

Invoked by a form component after it finishes rendering its tag (but before the tag is closed) to allow this object to contribute to the component's rendering process. Typically used by Validators and Translators to add javascript methods to the form's submit event handler.

Specified by:

renderContribution in interface FormComponentContributor

Parameters:

writer - allows contributor to write additional attributes into the component's tag

cycle - for accessing request information

context - utilities for genering messages and client-side validation

field - the field for which contributions are being rendered