UIComponentELTag (Java EE 5 SDK)

javax.faces.webapp Class UIComponentELTag

java.lang.Object
  javax.faces.webapp.UIComponentTagBase
      javax.faces.webapp.UIComponentClassicTagBase
          javax.faces.webapp.UIComponentELTag

所有已实现的接口:

BodyTag, IterationTag, JspIdConsumer, JspTag, Tag

public abstract class UIComponentELTag

extends UIComponentClassicTagBase

implements Tag

UIComponentELTag specializes its superclass to allow for properties that take their values from EL API expressions.

This tag is designed for use with Faces version 1.2 and JSP version 2.1 containers.

UIComponentELTag

public UIComponentELTag()

setBinding

public void setBinding(ValueExpression binding)
                throws JspException

Set the value expression for our component.

参数:

binding - The new value expression

抛出异常:

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 EL property as well as subclasses that expose it as an EL API property.

规范说明:

hasBinding in class UIComponentClassicTagBase

setRendered

public void setRendered(ValueExpression rendered)

Set an override for the rendered attribute.

参数:

rendered - The new value for rendered attribute

getELContext

protected ELContext getELContext()

Return the ELContext for the FacesContext for this request.

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

重写:

getELContext in class UIComponentTagBase

release

public void release()

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

规范说明:

release in interface Tag

重写:

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.

规范说明:

setProperties in class UIComponentClassicTagBase

参数:

component - UIComponent whose properties are to be overridden

createComponent

protected UIComponent createComponent(FacesContext context,
                                      String newId)
                               throws 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.

规范说明:

createComponent in class UIComponentClassicTagBase

参数:

context - FacesContext for the current request

newId - id of the component

抛出异常:

JspException

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