org.apache.cocoon.forms.formmodel
Class Action

java.lang.Object
  org.apache.cocoon.forms.formmodel.AbstractWidget
      org.apache.cocoon.forms.formmodel.Action

All Implemented Interfaces:

ActionListenerEnabled, Widget, Locatable

Direct Known Subclasses:

RepeaterAction, RowAction, Submit

public class Action
extends AbstractWidget
implements ActionListenerEnabled

An Action widget. An Action widget can cause an ActionEvent to be triggered on the server side, which will be handled by either the event handlers defined in the form definition, and/or by the FormHandler registered with the form, if any. An Action widget can e.g. be rendered as a button, or as a hidden field which gets its value set by javascript. The Action widget will generate its associated ActionEvent when a requestparameter is present with as name the id of this Action widget, and as value a non-empty value.

Version:

$Id: Action.html 1304258 2012-03-23 10:09:27Z ilgrosso $

Field Summary

Fields inherited from class org.apache.cocoon.forms.formmodel.AbstractWidget

wasValid

Fields inherited from interface org.apache.cocoon.forms.formmodel.Widget

PATH_SEPARATOR

Constructor Summary

Action(ActionDefinition definition)

Method Summary

void	addActionListener(ActionListener listener) Adds a ActionListener to this widget instance.
void	broadcastEvent(WidgetEvent event) Broadcast an event previously queued by this widget to its event listeners.
WidgetDefinition	getDefinition() Concrete subclasses should allow access to their underlaying Definition through this method.
String	getXMLElementName() The XML element name used in AbstractWidget.generateSaxFragment(ContentHandler, Locale) to produce the wrapping element for all the XML-instance-content of this Widget.
protected void	handleActivate() Handle the fact that this action was activated.
boolean	isValid() Return the current validation state.
void	performAction() Performs all actions and calls on-action listeners attached to this object.
void	readFromRequest(FormContext formContext) Lets this widget read its data from a request.
void	removeActionListener(ActionListener listener)
boolean	validate() Always return true (an action has no validation) TODO is there a use case for actions having validators?

Methods inherited from class org.apache.cocoon.forms.formmodel.AbstractWidget

addValidator, generateDisplayData, generateItemSaxFragment, generateLabel, generateSaxFragment, getAttribute, getChild, getCombinedState, getForm, getFullName, getId, getLocation, getName, getParent, getRequestParameterName, getState, getValue, getWidget, getXMLElementAttributes, initialize, isRequired, lookupWidget, removeAttribute, removeValidator, setAttribute, setParent, setState, setValue, toString, widgetNameChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

Action

public Action(ActionDefinition definition)

Method Detail

getDefinition

public WidgetDefinition getDefinition()

Description copied from class: AbstractWidget

Concrete subclasses should allow access to their underlaying Definition through this method. If subclasses decide to return null they should also organize own implementations of AbstractWidget.getId(), AbstractWidget.getLocation(), AbstractWidget.validate(), AbstractWidget.generateLabel(ContentHandler) and AbstractWidget.generateDisplayData(ContentHandler) to avoid NPE's.

Specified by:

getDefinition in interface Widget

Specified by:

getDefinition in class AbstractWidget

Returns:

the widgetDefinition from which this widget was instantiated. (See WidgetDefinition.createInstance())

readFromRequest

public void readFromRequest(FormContext formContext)

Description copied from interface: Widget

Lets this widget read its data from a request. At this point the Widget may try to convert the request parameter to its native datatype (if it is not a string), but it should not yet generate any validation errors.

Specified by:

readFromRequest in interface Widget

performAction

public void performAction()

Performs all actions and calls on-action listeners attached to this object. Note that this does not register this object as the submit widget and doesn't stop form processing.

handleActivate

protected void handleActivate()

Handle the fact that this action was activated. The default here is to perform any action associated to this object, end the current form processing and redisplay the form.

See Also:

performAction()

validate

public boolean validate()

Always return true (an action has no validation)
TODO is there a use case for actions having validators?

Specified by:

validate in interface Widget

Overrides:

validate in class AbstractWidget

Returns:

true to indicate all validations were ok, false otherwise

See Also:

Widget.validate()

isValid

public boolean isValid()

Description copied from interface: Widget

Return the current validation state. This method delivers the same result as the last call to Widget.validate(). The validation process is not started again. If the value of this widget has changed since the latest call to Widget.validate(), the result of this method is out of date.

Specified by:

isValid in interface Widget

Overrides:

isValid in class AbstractWidget

Returns:

The result of the last call to Widget.validate().

See Also:

Widget.isValid()

getXMLElementName

public String getXMLElementName()

Description copied from class: AbstractWidget

The XML element name used in AbstractWidget.generateSaxFragment(ContentHandler, Locale) to produce the wrapping element for all the XML-instance-content of this Widget.

Specified by:

getXMLElementName in class AbstractWidget

Returns:

"action"

addActionListener

public void addActionListener(ActionListener listener)

Adds a ActionListener to this widget instance. Listeners defined on the widget instance will be executed in addtion to any listeners that might have been defined in the widget definition.

Specified by:

addActionListener in interface ActionListenerEnabled

removeActionListener

public void removeActionListener(ActionListener listener)

Specified by:

removeActionListener in interface ActionListenerEnabled

broadcastEvent

public void broadcastEvent(WidgetEvent event)

Description copied from class: AbstractWidget

Broadcast an event previously queued by this widget to its event listeners. Abstract implementation throws a UnsupportedOperationException. Concrete subclass widgets need to override when supporting event broadcasting.

Specified by:

broadcastEvent in interface Widget

Overrides:

broadcastEvent in class AbstractWidget