javax.faces.webapp

Class UIComponentELTag

java.lang.Object

javax.faces.webapp.UIComponentTagBase

javax.faces.webapp.UIComponentClassicTagBase

javax.faces.webapp.UIComponentELTag

All Implemented Interfaces:

javax.servlet.jsp.tagext.BodyTag, javax.servlet.jsp.tagext.IterationTag, javax.servlet.jsp.tagext.JspIdConsumer, javax.servlet.jsp.tagext.JspTag, javax.servlet.jsp.tagext.Tag

Direct Known Subclasses:

ColumnTag, CommandButtonTag, CommandLinkTag, DataTableTag, FocusTag, FormTag, GraphicImageTag, InputFileTag, InputHiddenTag, InputSecretTag, InputTextareaTag, InputTextTag, MessagesTag, MessageTag, OutputFormatTag, OutputLabelTag, OutputLinkTag, OutputTextTag, PanelGridTag, PanelGroupTag, ParameterTag, SelectBooleanCheckboxTag, SelectItemsTag, SelectItemTag, SelectManyCheckboxTag, SelectManyListboxTag, SelectManyMenuTag, SelectOneListboxTag, SelectOneMenuTag, SelectOneRadioTag, SubviewTag, VerbatimTag, ViewTag

public abstract class UIComponentELTag
extends UIComponentClassicTagBase
implements javax.servlet.jsp.tagext.Tag

UIComponentELTag specializes its superclass to allow for properties that take their values from Jakarta Expression Language expressions.

This tag is designed for use with Faces version 1.2 and Jakarta Server Pages version 2.1 containers.

Field Summary

Fields inherited from class javax.faces.webapp.UIComponentClassicTagBase

bodyContent, pageContext, UNIQUE_ID_PREFIX

Fields inherited from class javax.faces.webapp.UIComponentTagBase

log

Fields inherited from interface javax.servlet.jsp.tagext.Tag

EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE

Fields inherited from interface javax.servlet.jsp.tagext.BodyTag

EVAL_BODY_BUFFERED, EVAL_BODY_TAG

Fields inherited from interface javax.servlet.jsp.tagext.IterationTag

EVAL_BODY_AGAIN

Constructor Summary

Constructors

Constructor and Description
UIComponentELTag()

Method Summary

Modifier and Type	Method and Description
protected UIComponent	createComponent(FacesContext context, String newId) Create and return a new child component of the type returned by calling getComponentType().
protected javax.el.ELContext	getELContext() Return the ELContext for the FacesContext for this request.
protected boolean	hasBinding() Return true if this component has a non-null binding attribute.
void	release() Release any resources allocated during the execution of this tag handler.
void	setBinding(javax.el.ValueExpression binding) Set the value expression for our component.
protected void	setProperties(UIComponent component) Override properties and attributes of the specified component, if the corresponding properties of this tag handler instance were explicitly set.
void	setRendered(javax.el.ValueExpression rendered) Set an override for the rendered attribute.

Methods inherited from class javax.faces.webapp.UIComponentClassicTagBase

addChild, addFacet, addVerbatimAfterComponent, addVerbatimBeforeComponent, createVerbatimComponent, createVerbatimComponentFromBodyContent, doAfterBody, doEndTag, doInitBody, doStartTag, encodeBegin, encodeChildren, encodeEnd, findComponent, getBodyContent, getComponentInstance, getCreated, getCreatedComponents, getDoAfterBodyValue, getDoEndValue, getDoStartValue, getFacesContext, getFacesJspId, getFacetName, getId, getIndexOfNextChildTag, getJspId, getParent, getParentUIComponentClassicTagBase, getPreviousOut, setBodyContent, setId, setJspId, setPageContext, setParent, setupResponseWriter

Methods inherited from class javax.faces.webapp.UIComponentTagBase

getComponentType, getRendererType

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.servlet.jsp.tagext.Tag

doEndTag, doStartTag, getParent, setPageContext, setParent

Constructor Detail

UIComponentELTag

public UIComponentELTag()

Method Detail

setBinding

public void setBinding(javax.el.ValueExpression binding)
                throws javax.servlet.jsp.JspException

Set the value expression for our component.

Parameters:

binding - The new value expression

Throws:

javax.servlet.jsp.JspException - if an error occurs

hasBinding

protected boolean hasBinding()

Description copied from class: UIComponentClassicTagBase

Return true if this component has a non-null binding attribute. This method is necessary to allow subclasses that expose the binding property as an Faces 1.1 style Expression Language property as well as subclasses that expose it as a Jakarta Expression Language API property.

Specified by:

hasBinding in class UIComponentClassicTagBase

Returns:

whether or not this component has a binding attribute

setRendered

public void setRendered(javax.el.ValueExpression rendered)

Set an override for the rendered attribute.

Parameters:

rendered - The new value for rendered attribute

getELContext

protected javax.el.ELContext getELContext()

Return the ELContext for the FacesContext for this request.

This is a convenience for getFacesContext().getELContext().

Overrides:

getELContext in class UIComponentTagBase

Returns:

the {code ELContext} for this FacesContext

release

public void release()

Release any resources allocated during the execution of this tag handler.

Specified by:

release in interface javax.servlet.jsp.tagext.Tag

Overrides:

release in class UIComponentClassicTagBase

setProperties

protected void setProperties(UIComponent component)

Override properties and attributes of the specified component, if the corresponding properties of this tag handler instance were explicitly set. This method must be called ONLY if the specified UIComponent was in fact created during the execution of this tag handler instance, and this call will occur BEFORE the UIComponent is added to the view.

Tag subclasses that want to support additional set properties must ensure that the base class setProperties() method is still called. A typical implementation that supports extra properties foo and bar would look something like this:

 protected void setProperties(UIComponent component) {
   super.setProperties(component);
   if (foo != null) {
     component.setAttribute("foo", foo);
   }
   if (bar != null) {
     component.setAttribute("bar", bar);
   }
 }
 

The default implementation overrides the following properties:

• rendered - Set if a value for the rendered property is specified for this tag handler instance.
• rendererType - Set if the getRendererType() method returns a non-null value.

Specified by:

setProperties in class UIComponentClassicTagBase

Parameters:

component - UIComponent whose properties are to be overridden

createComponent

protected UIComponent createComponent(FacesContext context,
                                      String newId)
                               throws javax.servlet.jsp.JspException

Create and return a new child component of the type returned by calling getComponentType(). If this UIComponentELTag has a non-null binding attribute, this is done by call Application.createComponent(java.lang.String) with the ValueExpression created for the binding attribute, and the ValueExpression will be stored on the component. Otherwise, Application.createComponent(java.lang.String) is called with only the component type. Finally, initialize the components id and other properties.

Specified by:

createComponent in class UIComponentClassicTagBase

Parameters:

context - FacesContext for the current request

newId - id of the component

Returns:

the created component

Throws:

javax.servlet.jsp.JspException - if the component cannot be created