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package javax.faces.view.facelets;
import javax.faces.component.UIComponent;
import javax.faces.component.UIPanel;
/**
* Public base class for markup element
* instances that map to {@link UIComponent} instances in the view.
*
*
*
* The implementation must guarantee that the apply()
* method is overridden and takes the following actions, in this order.
* These actions must only happen the first time this facelet is applied
* for each user. Subsequent applications must take no action.
*
* The UIComponent represented by this
* element is created with the appropriate
* Application.createComponent() method.
Each attribute specified in the markup is correctly
applied to the component instance, as specified in the VDLDocs
for this element.
If project stage is #{@link javax.faces.application.ProjectStage#Development},
Put the {@link javax.faces.view.Location} for this
element into the component attribute Map under
the key given by the value of the symbolic constant {@link
javax.faces.component.UIComponent#VIEW_LOCATION_KEY}.
Set the id of the component. If the id is specified
manually by the page author, that value must be set as the id.
Otherwise, the closest ancestor component that is an instance
of {@link javax.faces.component.UniqueIdVendor} must be
located and its {@link
javax.faces.component.UniqueIdVendor#createUniqueId} method
must be called to derive the id. If no such instance can be
found, call {@link
javax.faces.component.UIViewRoot#createUniqueId} to derive the
id.
The rendererType property of the component is set properly.
{@link #onComponentCreated} is called.
{@link UIComponent#pushComponentToEL} is called on the
newly created component.
The next handler in the facelet chain is applied. This
will cause the component to be populated with children.
The component is added to its parent in the view.
{@link UIComponent#popComponentFromEL} is called on the
newly created component.
Call {@link UIComponent#markInitialState}.
*
*
*
* @since 2.0
*/
public class ComponentHandler extends DelegatingMetaTagHandler {
private TagHandlerDelegate helper = null;
private ComponentConfig componentConfig = null;
/**
* Leverage the {@link
* TagHandlerDelegateFactory} provided by the implementation to create
* an instance of {@link TagHandlerDelegate} designed for use with
* ComponentHandler.
*
* @since 2.0
*/
public ComponentHandler(ComponentConfig config) {
super(config);
this.componentConfig = config;
}
@Override
protected TagHandlerDelegate getTagHandlerDelegate() {
if (null == helper) {
helper = delegateFactory.createComponentHandlerDelegate(this);
}
return helper;
}
public ComponentConfig getComponentConfig() {
return this.componentConfig;
}
/**
* This method is guaranteed to be
* called after the component has been created but before it has
* been populated with children.
*
* @param ctx the FaceletContext for this view execution
* @param c the UIComponent that has just been created.
*
* @param parent the parent UIComponent of the
* component represented by this element instance.
*
* @since 2.0
*/
public void onComponentCreated(FaceletContext ctx, UIComponent c,
UIComponent parent) {
}
/**
* This method is guaranteed to be
* called after the component has been populated with children.
*
* @param ctx the FaceletContext for this view execution
* @param c the UIComponent that has just been
* populated with children.
*
* @param parent the parent UIComponent of the
* component represented by this element instance.
*
* @since 2.0
*/
public void onComponentPopulated(FaceletContext ctx, UIComponent c,
UIComponent parent) {
}
/**
* Determine if the passed component is
* not null and if it's new to the tree. This operation can be used for determining if attributes
* should be wired to the component.
*
* @param component the component you wish to modify
* @since 2.0
*/
public static boolean isNew(UIComponent component) {
UIComponent c = component;
if (c != null) {
UIComponent parent = c.getParent();
if (parent != null) {
if (UIComponent.isCompositeComponent(parent)) {
c = parent;
}
}
return c.getParent() == null;
} else {
return false;
}
}
}