Class UIImportConstants

java.lang.Object

jakarta.faces.component.UIComponent

jakarta.faces.component.UIComponentBase

jakarta.faces.component.UIImportConstants

All Implemented Interfaces:

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

public class UIImportConstants
extends UIComponentBase

UIImportConstants imports a mapping of all constant field values of the given type in the current view.

The ViewDeclarationLanguage implementation must cause an instance of this component to be placed in the view for each occurrence of an <f:importConstants /> element placed inside of an <f:metadata /> element. The user must place <f:metadata /> as a direct child of the UIViewRoot. The ViewMetadata.createMetadataView(jakarta.faces.context.FacesContext) must take care of actual task of importing the constants.

Instances of this class participate in the regular Jakarta Faces lifecycle, including on Ajax requests.

The purpose of this component is to provide a mapping of all constant field values of the given type in the current view. Constant field values are all public static final fields of the given type. The map key represents the constant field name as String. The map value represents the actual constant field value. This works for classes, interfaces and enums.

Usage

The below constant fields:

package com.example;

public class Foo {
    public static final String FOO1 = "foo1";
    public static final String FOO2 = "foo2";
}

package com.example;

public interface Bar {
    public static final String BAR1 = "bar1";
    public static final String BAR2 = "bar2";
}

package com.example;

public enum Baz {
    BAZ1, BAZ2;
}

Can be imported as below:

<f:metadata>
    <f:importConstants type="com.example.Foo" />
    <f:importConstants type="com.example.Bar" var="Barrr" />
    <f:importConstants type="com.example.Baz" />
</f:metadata>

And can be referenced as below:

#{Foo.FOO1}, #{Foo.FOO2}, #{Barrr.BAR1}, #{Barrr.BAR2}, #{Baz.BAZ1}, #{Baz.BAZ2}

<h:selectOneMenu value="#{bean.baz}" >
    <f:selectItems value="#{Baz}" />
</h:selectOneMenu>

Since:

2.3

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 UIComponent

ATTRS_WITH_DECLARED_DEFAULT_VALUES, BEANINFO_KEY, COMPOSITE_COMPONENT_TYPE_KEY, COMPOSITE_FACET_NAME, FACETS_KEY, VIEW_LOCATION_KEY

Modifier and Type	Field	Description
static final String	ATTRS_WITH_DECLARED_DEFAULT_VALUES	This constant enables one to quickly discover the names of the declared composite component attributes that have been given default values by the composite component author.
static final String	BEANINFO_KEY	The value of this constant is used as the key in the component attribute map, the value for which is a java.beans.BeanInfo implementation describing the composite component.
static final String	COMPOSITE_COMPONENT_TYPE_KEY	The value of this constant is used as the key in the composite component BeanDescriptor for a ValueExpression that evaluates to the component-type of the composite component root UIComponent for this composite component, if one was declared by the composite component author.
static final String	COMPOSITE_FACET_NAME	The value of this constant is used as the key in the Map returned as described in UIComponent.FACETS_KEY for the PropertyDescriptor describing the composite component facet.
static final String	FACETS_KEY	The value of this constant is used as the key in the composite component BeanDescriptor for the Map<PropertyDescriptor> that contains meta-information for the declared facets for this composite component.
static final String	VIEW_LOCATION_KEY	The value of this constant is used as the key in the component attributes Map for the Location in the view at which this component instance resides.

Constructor Summary

Constructors

Constructor	Description
UIImportConstants()	Create a new UIImportConstants instance with renderer type set to null.

Method Summary

Modifier and Type	Method	Description
String	getFamily()	Return the identifier of the component family to which this component belongs.
String	getType()	Returns the fully qualified name of the type to import the constant field values for.
String	getVar()	Returns name of request scope attribute under which constants will be exposed as a Map.
void	setType(String type)	Sets the fully qualified name of the type to import the constant field values for.
void	setValueExpression(String name, jakarta.el.ValueExpression binding)	Set the ValueExpression used to calculate the value for the specified attribute or property name, if any.
void	setVar(String var)	Sets name of request scope attribute under which constants will be exposed as a Map.

Methods inherited from class UIComponentBase

addClientBehavior, addFacesListener, broadcast, clearInitialState, decode, 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, markInitialState, processDecodes, processRestoreState, processSaveState, processUpdates, processValidators, queueEvent, removeFacesListener, restoreAttachedState, restoreState, saveAttachedState, saveState, setId, setParent, setRendered, setRendererType, setTransient, subscribeToEvent, unsubscribeFromEvent

Modifier and Type	Method	Description
void	addClientBehavior(String eventName, ClientBehavior behavior)	This is a default implementation of ClientBehaviorHolder.addClientBehavior(String, ClientBehavior).
protected void	addFacesListener(FacesListener listener)	Add the specified FacesListener to the set of listeners registered to receive event notifications from this UIComponent.
void	broadcast(FacesEvent event)	Broadcast the specified FacesEvent to all registered event listeners who have expressed an interest in events of this type.
void	clearInitialState()	For each of the attached objects on this instance that implement PartialStateHolder, call PartialStateHolder.clearInitialState() on the attached object.
void	decode(FacesContext context)	Decode any new state of this UIComponent from the request contained in the specified FacesContext, and store this state as needed.
void	encodeBegin(FacesContext context)	If our rendered property is true, render the beginning of the current state of this UIComponent to the response contained in the specified FacesContext.
void	encodeChildren(FacesContext context)	If our rendered property is true, render the child UIComponents of this UIComponent.
void	encodeEnd(FacesContext context)	If our rendered property is true, render the ending of the current state of this UIComponent.
UIComponent	findComponent(String expression)	Search for and return the UIComponent with an id that matches the specified search expression (if any), according to the algorithm described below.
Map<String,Object>	getAttributes()	Return a mutable Map representing the attributes (and properties, see below) associated wth this UIComponent, keyed by attribute name (which must be a String).
int	getChildCount()	Return the number of child UIComponents that are associated with this UIComponent.
List<UIComponent>	getChildren()	Return a mutable List representing the child UIComponents associated with this component.
Map<String, List<ClientBehavior>>	getClientBehaviors()	This is a default implementation of ClientBehaviorHolder.getClientBehaviors().
String	getClientId(FacesContext context)	Return a client-side identifier for this component, generating one if necessary.
String	getDefaultEventName()	This is a default implementation of ClientBehaviorHolder.getDefaultEventName().
Collection<String>	getEventNames()	This is a default implementation of ClientBehaviorHolder.getEventNames().
protected FacesContext	getFacesContext()	Convenience method to return the FacesContext instance for the current request.
protected FacesListener[]	getFacesListeners(Class clazz)	Return an array of registered FacesListeners that are instances of the specified class.
UIComponent	getFacet(String name)	Convenience method to return the named facet, if it exists, or null otherwise.
int	getFacetCount()	Return the number of facet UIComponents that are associated with this UIComponent.
Map<String, UIComponent>	getFacets()	Return a mutable Map representing the facet UIComponents associated with this UIComponent, keyed by facet name (which must be a String).
Iterator<UIComponent>	getFacetsAndChildren()	Return an Iterator over the facet followed by child UIComponents of this UIComponent.
String	getId()	Return the component identifier of this UIComponent.
List<SystemEventListener>	getListenersForEventClass(Class<? extends SystemEvent> eventClass)	Return the SystemEventListener instances registered on this UIComponent instance that are interested in events of type eventClass.
UIComponent	getParent()	Return the parent UIComponent of this UIComponent, if any.
Map<String,Object>	getPassThroughAttributes(boolean create)	This method has the same specification as UIComponent.getPassThroughAttributes() except that it is allowed to return null if and only if the argument create is false and no pass through attribute data structure exists for this instance.
protected Renderer	getRenderer(FacesContext context)	Convenience method to return the Renderer instance associated with this component, if any; otherwise, return null.
String	getRendererType()	Return the Renderer type for this UIComponent (if any).
boolean	getRendersChildren()	Return a flag indicating whether this component is responsible for rendering its child components.
boolean	invokeOnComponent(FacesContext context, String clientId, ContextCallback callback)	Starting at this component in the View hierarchy, search for a component with a clientId equal to the argument clientId and, if found, call the ContextCallback.invokeContextCallback(FacesContext, UIComponent) method on the argument callback, passing the current FacesContext and the found component as arguments.
boolean	isRendered()	Return true if this component (and its children) should be rendered during the Render Response phase of the request processing lifecycle.
boolean	isTransient()	If true, the Object implementing this interface must not participate in state saving or restoring.
void	markInitialState()	For each of the attached objects on this instance that implement PartialStateHolder, call PartialStateHolder.markInitialState() on the attached object.
void	processDecodes(FacesContext context)	Perform the component tree processing required by the Apply Request Values phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
void	processRestoreState(FacesContext context, Object state)	Perform the component tree processing required by the Restore View phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
Object	processSaveState(FacesContext context)	Perform the component tree processing required by the state saving portion of the Render Response phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
void	processUpdates(FacesContext context)	Perform the component tree processing required by the Update Model Values phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
void	processValidators(FacesContext context)	Perform the component tree processing required by the Process Validations phase of the request processing lifecycle for all facets of this component, all children of this component, and this component itself, as follows.
void	queueEvent(FacesEvent event)	Queue an event for broadcast at the end of the current request processing lifecycle phase.
protected void	removeFacesListener(FacesListener listener)	Remove the specified FacesListener from the set of listeners registered to receive event notifications from this UIComponent.
static Object	restoreAttachedState(FacesContext context, Object stateObj)	This method is called by UIComponent subclasses that need to restore the objects they saved using UIComponentBase.saveAttachedState(FacesContext, Object).
void	restoreState(FacesContext context, Object state)	Perform any processing required to restore the state from the entries in the state Object.
static Object	saveAttachedState(FacesContext context, Object attachedObject)	This method is called by UIComponent subclasses that want to save one or more attached objects.
Object	saveState(FacesContext context)	Gets the state of the instance as a Serializable Object.
void	setId(String id)	Set the component identifier of this UIComponent (if any).
void	setParent(UIComponent parent)	Set the parent UIComponent of this UIComponent.
void	setRendered(boolean rendered)	Set the rendered property of this UIComponent.
void	setRendererType(String rendererType)	Set the Renderer type for this UIComponent, or null for components that render themselves.
void	setTransient(boolean transientFlag)	Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
void	subscribeToEvent(Class<? extends SystemEvent> eventClass, ComponentSystemEventListener componentListener)	Install the listener instance referenced by argument componentListener as a listener for events of type eventClass originating from this specific instance of UIComponent.
void	unsubscribeFromEvent(Class<? extends SystemEvent> eventClass, ComponentSystemEventListener componentListener)	Remove the listener instance referenced by argument componentListener as a listener for events of type eventClass originating from this specific instance of UIComponent.

Methods inherited from class UIComponent

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

Modifier and Type	Method	Description
void	encodeAll(FacesContext context)	If this component returns true from UIComponent.isRendered(), take the following action.
String	getClientId()	Enable Jakarta Expression Language to access the clientId of a component.
static UIComponent	getCompositeComponentParent(UIComponent component)	Finds the nearest composite component parent of the specified component.
String	getContainerClientId(FacesContext context)	Allow components that implement NamingContainer to selectively disable prepending their clientId to their descendent's clientIds by breaking the prepending logic into a separately callable method.
static UIComponent	getCurrentComponent(FacesContext context)	Return the UIComponent instance that is currently processing.
static UIComponent	getCurrentCompositeComponent(FacesContext context)	Return the closest ancestor component, relative to the component returned from UIComponent.getCurrentComponent(FacesContext), that is a composite component, or null if no such component exists.
UIComponent	getFacet(Enum<?> identifier)	Convenience method to return the named facet using an enum identifier, if it exists, or null otherwise.
UIComponent	getNamingContainer()	Starting with "this", return the closest component in the ancestry that is a NamingContainer or null if none can be found.
Map<String,Object>	getPassThroughAttributes()	This is a convenience method that simply calls UIComponent.getPassThroughAttributes(boolean), passing true as the argument.
Map<String,String>	getResourceBundleMap()	Return a Map<String,String> of the ResourceBundle for this component.
protected StateHelper	getStateHelper()	Return the StateHelper instance used to help this component implement PartialStateHolder.
protected StateHelper	getStateHelper(boolean create)	Like UIComponent.getStateHelper(), but only create a state helper instance if the argument creat is true.
TransientStateHelper	getTransientStateHelper()	Return the TransientStateHelper instance for this UIComponent instance.
TransientStateHelper	getTransientStateHelper(boolean create)	Return the TransientStateHelper instance for this UIComponent instance.
jakarta.el.ValueExpression	getValueExpression(String name)	Return the ValueExpression used to calculate the value for the specified attribute or property name, if any.
boolean	initialStateMarked()	An implementation of PartialStateHolder.initialStateMarked(), this method is called by the runtime to test if the PartialStateHolder.markInitialState() method was called.
static boolean	isCompositeComponent(UIComponent component)	Return true if component is a composite component, otherwise false.
boolean	isInView()	Return true if this component is within the view hierarchy otherwise false
protected boolean	isVisitable(VisitContext context)	Return true if this component should be visited, false otherwise.
void	popComponentFromEL(FacesContext context)	Pop the current UIComponent from the FacesContext attributes map so that the previous UIComponent, if any, becomes the current component.
void	processEvent(ComponentSystemEvent event)	The default implementation performs the following action.
void	pushComponentToEL(FacesContext context, UIComponent component)	Push the current UIComponent this to the FacesContext attribute map saving the previous UIComponent for a subsequent call to UIComponent.popComponentFromEL(FacesContext).
void	restoreTransientState(FacesContext context, Object state)	For components that need to support the concept of transient state, this method will restore any state saved on a prior call to UIComponent.saveTransientState(FacesContext).
Object	saveTransientState(FacesContext context)	For components that need to support the concept of transient state, this method will save any state that is known to be transient in nature.
void	setInView(boolean isInView)	Updates the status as to whether or not this component is currently within the view hierarchy.
boolean	visitTree(VisitContext visitContext, VisitCallback callback)	Perform a tree visit starting at this node in the tree.

Methods inherited from class Object

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

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

UIImportConstants

public UIImportConstants()

Create a new UIImportConstants instance with renderer type set to null.

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

Specified by:

getFamily in class UIComponent

Returns:

the component family (not null).

getType

public String getType()

Returns the fully qualified name of the type to import the constant field values for.

Returns:

The fully qualified name of the type to import the constant field values for.

setType

public void setType(String type)

Sets the fully qualified name of the type to import the constant field values for.

Parameters:

type - The fully qualified name of the type to import the constant field values for.

getVar

public String getVar()

Returns name of request scope attribute under which constants will be exposed as a Map.

Returns:

Name of request scope attribute under which constants will be exposed as a Map.

setVar

public void setVar(String var)

Sets name of request scope attribute under which constants will be exposed as a Map.

Parameters:

var - Name of request scope attribute under which constants will be exposed as a Map.

setValueExpression

public void setValueExpression(String name,
 jakarta.el.ValueExpression binding)

Set the ValueExpression used to calculate the value for the specified attribute or property name, if any. If a ValueExpression is set for the var property, throw an illegal argument exception.

Overrides:

setValueExpression in class UIComponent

Parameters:

name - Name of the attribute or property for which to set a ValueExpression

binding - The ValueExpression to set, or null to remove any currently set ValueExpression

Throws:

IllegalArgumentException - If name is one of id, parent, or var.

NullPointerException - If name is null.