Package jakarta.faces.component

Class UIViewParameter

java.lang.Object

jakarta.faces.component.UIComponent

jakarta.faces.component.UIComponentBase

jakarta.faces.component.UIOutput

jakarta.faces.component.UIInput

jakarta.faces.component.UIViewParameter

All Implemented Interfaces:

EditableValueHolder, PartialStateHolder, StateHolder, TransientStateHolder, ValueHolder, ComponentSystemEventListener, FacesListener, SystemEventListenerHolder, EventListener

public class UIViewParameter
extends UIInput

UIViewParameter represents a binding between a request parameter and a model property or UIViewRoot property. This is a bi-directional binding.

The ViewDeclarationLanguage implementation must cause an instance of this component to appear in the view for each occurrence of an <f:viewParam /> element placed inside of an <f:metadata /> element. The user must place this facet within the UIViewRoot.

Because this class extends UIInput any actions that one would normally take on a UIInput instance are valid for instances of this class. Instances of this class participate in the regular Jakarta Server Faces lifecycle, including on Ajax requests.

Since:

2.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	UIViewParameter.Reference	Inner class to encapsulate a UIViewParameter instance so that it may be safely referenced regardless of whether or not the current view is the same as the view in which this UIViewParameter resides.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	COMPONENT_FAMILY	The standard component family for this component.
static final String	COMPONENT_TYPE	The standard component type for this component.

Fields inherited from class jakarta.faces.component.UIInput

ALWAYS_PERFORM_VALIDATION_WHEN_REQUIRED_IS_TRUE, CONVERSION_MESSAGE_ID, EMPTY_STRING_AS_NULL_PARAM_NAME, REQUIRED_MESSAGE_ID, UPDATE_MESSAGE_ID, VALIDATE_EMPTY_FIELDS_PARAM_NAME

Fields inherited from class jakarta.faces.component.UIComponent

ATTRS_WITH_DECLARED_DEFAULT_VALUES, BEANINFO_KEY, bindings, COMPOSITE_COMPONENT_TYPE_KEY, COMPOSITE_FACET_NAME, FACETS_KEY, VIEW_LOCATION_KEY

Constructor Summary

Constructors

Constructor	Description
UIViewParameter()	Create a new UIViewParameter instance with default property values.

Method Summary

Modifier and Type	Method	Description
void	decode(FacesContext context)	Override behavior from superclass to pull a value from the incoming request parameter map under the name given by getName() and store it with a call to UIInput.setSubmittedValue(java.lang.Object).
void	encodeAll(FacesContext context)	Called specially by UIViewRoot.encodeEnd(jakarta.faces.context.FacesContext), this method simply sets the submitted value to be the return from getStringValue(jakarta.faces.context.FacesContext).
protected Object	getConvertedValue(FacesContext context, Object submittedValue)	Because this class has no Renderer, leverage the one from the standard HTML_BASIC RenderKit with component-family: jakarta.faces.Input and renderer-type: jakarta.faces.Text and call its Renderer.getConvertedValue(jakarta.faces.context.FacesContext, jakarta.faces.component.UIComponent, java.lang.Object) method.
String	getFamily()	Return the identifier of the component family to which this component belongs.
String	getName()	Return the request parameter name from which the value is retrieved.
String	getStringValue(FacesContext context)	If the value of this parameter comes from a ValueExpression return the value of the expression, otherwise, return the local value.
String	getStringValueFromModel(FacesContext context)	Manually perform standard conversion steps to get a string value from the value expression.
Object	getSubmittedValue()	Assume that the submitted value is always a string, but the return type from this method is Object..
boolean	isImmediate()	Return false.
void	processValidators(FacesContext context)	Specialize superclass behavior to treat null differently.
void	setName(String name)	Set the request parameter name from which the value is retrieved.
void	setSubmittedValue(Object submittedValue)	PENDING (docs) Interesting that submitted value isn't saved by the parent
void	updateModel(FacesContext context)	Call through to superclass UIInput.updateModel(jakarta.faces.context.FacesContext) then take the additional action of pushing the value into request scope if and only if the value is not a value expression, is valid, and the local value was set on this lifecycle execution.

Methods inherited from class jakarta.faces.component.UIInput

addValidator, addValueChangeListener, clearInitialState, compareValues, getConverterMessage, getRequiredMessage, getValidatorMessage, getValidators, getValue, getValueChangeListeners, isEmpty, isLocalValueSet, isRequired, isValid, markInitialState, processDecodes, processUpdates, removeValidator, removeValueChangeListener, resetValue, restoreState, saveState, setConverterMessage, setImmediate, setLocalValueSet, setRequired, setRequiredMessage, setValid, setValidatorMessage, setValue, validate, validateValue

Methods inherited from class jakarta.faces.component.UIOutput

getConverter, getLocalValue, setConverter

Methods inherited from class jakarta.faces.component.UIComponentBase

addClientBehavior, addFacesListener, broadcast, encodeBegin, encodeChildren, encodeEnd, findComponent, getAttributes, getChildCount, getChildren, getClientBehaviors, getClientId, getDefaultEventName, getEventNames, getFacesContext, getFacesListeners, getFacet, getFacetCount, getFacets, getFacetsAndChildren, getId, getListenersForEventClass, getParent, getPassThroughAttributes, getRenderer, getRendererType, getRendersChildren, invokeOnComponent, isRendered, isTransient, processRestoreState, processSaveState, queueEvent, removeFacesListener, restoreAttachedState, saveAttachedState, setId, setParent, setRendered, setRendererType, setTransient, subscribeToEvent, unsubscribeFromEvent

Methods inherited from class jakarta.faces.component.UIComponent

getClientId, getCompositeComponentParent, getContainerClientId, getCurrentComponent, getCurrentCompositeComponent, getNamingContainer, getPassThroughAttributes, getResourceBundleMap, getStateHelper, getStateHelper, getTransientStateHelper, getTransientStateHelper, getValueExpression, initialStateMarked, isCompositeComponent, isInView, isVisitable, popComponentFromEL, processEvent, pushComponentToEL, restoreTransientState, saveTransientState, setInView, setValueExpression, visitTree

Methods inherited from class java.lang.Object

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

Methods inherited from interface jakarta.faces.component.ValueHolder

getConverter, getLocalValue, setConverter

Field Details

COMPONENT_TYPE

public static final String COMPONENT_TYPE

The standard component type for this component.

See Also:

• Constant Field Values

COMPONENT_FAMILY

public static final String COMPONENT_FAMILY

The standard component family for this component.

See Also:

• Constant Field Values

Constructor Details

UIViewParameter

public UIViewParameter()

Create a new UIViewParameter instance with default property values.

Method Details

getFamily

public String getFamily()

Description copied from class: UIComponent

Return the identifier of the component family to which this component belongs. This identifier, in conjunction with the value of the rendererType property, may be used to select the appropriate Renderer for this component instance. Note this method should NOT return null

Overrides:

getFamily in class UIInput

Returns:

the component family (not null).

getName

public String getName()

Return the request parameter name from which the value is retrieved.

Returns:

the name.

Since:

2.0

setName

public void setName(String name)

Set the request parameter name from which the value is retrieved.

Parameters:

name - The new request parameter name.

Since:

2.0

isImmediate

public boolean isImmediate()

Return false. The immediate setting is not relevant for view parameters and must be assumed to be false.

Specified by:

isImmediate in interface EditableValueHolder

Overrides:

isImmediate in class UIInput

Returns:

true if immediate, false otherwise.

Since:

2.0

getSubmittedValue

public Object getSubmittedValue()

Assume that the submitted value is always a string, but the return type from this method is Object..

Specified by:

getSubmittedValue in interface EditableValueHolder

Overrides:

getSubmittedValue in class UIInput

Returns:

the submitted value.

Since:

2.0

setSubmittedValue

public void setSubmittedValue(Object submittedValue)

PENDING (docs) Interesting that submitted value isn't saved by the parent

Specified by:

setSubmittedValue in interface EditableValueHolder

Overrides:

setSubmittedValue in class UIInput

Parameters:

submittedValue - The new submitted value

decode

public void decode(FacesContext context)

Override behavior from superclass to pull a value from the incoming request parameter map under the name given by getName() and store it with a call to UIInput.setSubmittedValue(java.lang.Object).

Overrides:

decode in class UIInput

Parameters:

context - FacesContext for the request we are processing

Since:

2.0

processValidators

public void processValidators(FacesContext context)

Specialize superclass behavior to treat null differently. In this class, a null value along with the "required" flag being set to true will cause a validation failure. Otherwise, If the UIInput.EMPTY_STRING_AS_NULL_PARAM_NAME context parameter is true and the value is null, call UIInput.setSubmittedValue(java.lang.Object) passing the empty string as the argument. This will cause the normal validation processing to happen, including bean validation.

Overrides:

processValidators in class UIInput

Parameters:

context - the Faces context.

Since:

2.0

See Also:

• PreValidateEvent
• PostValidateEvent

updateModel

public void updateModel(FacesContext context)

Call through to superclass UIInput.updateModel(jakarta.faces.context.FacesContext) then take the additional action of pushing the value into request scope if and only if the value is not a value expression, is valid, and the local value was set on this lifecycle execution.

Overrides:

updateModel in class UIInput

Parameters:

context - FacesContext for the request we are processing

Since:

2.0

encodeAll

public void encodeAll(FacesContext context)
               throws IOException

Called specially by UIViewRoot.encodeEnd(jakarta.faces.context.FacesContext), this method simply sets the submitted value to be the return from getStringValue(jakarta.faces.context.FacesContext).

Overrides:

encodeAll in class UIComponent

Parameters:

context - the Faces context.

Throws:

IOException - when an I/O error occurs.

Since:

2.0

getStringValue

public String getStringValue(FacesContext context)

If the value of this parameter comes from a ValueExpression return the value of the expression, otherwise, return the local value.

Parameters:

context - the Faces context.

Returns:

the string value.

Since:

2.0

getStringValueFromModel

public String getStringValueFromModel(FacesContext context)
                               throws ConverterException

Manually perform standard conversion steps to get a string value from the value expression.

Parameters:

context - the Faces context.

Returns:

the string value from the model.

Throws:

ConverterException

Since:

2.0

getConvertedValue

protected Object getConvertedValue(FacesContext context,
 Object submittedValue)
                            throws ConverterException

Because this class has no Renderer, leverage the one from the standard HTML_BASIC RenderKit with component-family: jakarta.faces.Input and renderer-type: jakarta.faces.Text and call its Renderer.getConvertedValue(jakarta.faces.context.FacesContext, jakarta.faces.component.UIComponent, java.lang.Object) method.

Overrides:

getConvertedValue in class UIInput

Parameters:

context - the Faces context.

submittedValue - the submitted value.

Returns:

the converted value.

Throws:

ConverterException

Since:

2.0