javax.faces.component.visit
Class VisitContextWrapper

java.lang.Object
  extended by javax.faces.component.visit.VisitContext
      extended by javax.faces.component.visit.VisitContextWrapper
All Implemented Interfaces:
FacesWrapper<VisitContext>

public abstract class VisitContextWrapper
extends VisitContext
implements FacesWrapper<VisitContext>

Provides a simple implementation of VisitContext that can be subclassed by developers wishing to provide specialized behavior to an existing VisitContext instance. The default implementation of all methods is to call through to the wrapped VisitContext instance.

Usage: extend this class and override getWrapped() to return the instance we are wrapping.

Since:
2.0

Field Summary
 
Fields inherited from class javax.faces.component.visit.VisitContext
ALL_IDS
 
Constructor Summary
VisitContextWrapper()
           
 
Method Summary
 FacesContext getFacesContext()
          

Returns the FacesContext for the current request.

 Set<VisitHint> getHints()
          Returns hints that influence the behavior of the tree visit.
 Collection<String> getIdsToVisit()
          

Returns the ids of the components to visit.

 Collection<String> getSubtreeIdsToVisit(UIComponent component)
          

Given a NamingContainer component, returns the client ids of any components underneath the NamingContainer that should be visited.

abstract  VisitContext getWrapped()
          

A class that implements this interface uses this method to return an instance of the class being wrapped.

 VisitResult invokeVisitCallback(UIComponent component, VisitCallback callback)
          Called by UIComponent.visitTree() to visit a single component.
 
Methods inherited from class javax.faces.component.visit.VisitContext
createVisitContext, createVisitContext
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

VisitContextWrapper

public VisitContextWrapper()
Method Detail

getFacesContext

public FacesContext getFacesContext()
Description copied from class: VisitContext

Returns the FacesContext for the current request.

Specified by:
getFacesContext in class VisitContext

getHints

public Set<VisitHint> getHints()
Description copied from class: VisitContext

Returns hints that influence the behavior of the tree visit.

Interested parties, such as UIComponent.visitTree() implementations, may check to see whether a particular hint is present by calling VisitContext.getHints().contains(), passing in one of the hints defined by VisitHint.

Specified by:
getHints in class VisitContext
Returns:
a non-empty, unmodifiable collection of VisitHints

getIdsToVisit

public Collection<String> getIdsToVisit()
Description copied from class: VisitContext

Returns the ids of the components to visit.

In the case of a full tree visit, this method returns the ALL_IDS collection. Otherwise, if a partial visit is beign performed, returns a modifiable collection containing the client ids of the components that should be visited.

Specified by:
getIdsToVisit in class VisitContext

getSubtreeIdsToVisit

public Collection<String> getSubtreeIdsToVisit(UIComponent component)
Description copied from class: VisitContext

Given a NamingContainer component, returns the client ids of any components underneath the NamingContainer that should be visited.

This method is called by NamingContainer visitTree() implementations to determine whether the NamingContainer contains components to be visited. In the case where no such components exist, the NamingContainer can short-circuit the tree visit and avoid descending into child subtrees.

In addition, iterating components such as UIData may be able to use the returned ids to determine which iterated states (ie. rows) need to be visited. This allows the visit traversal to be contstrained such only those rows that contain visit targets need to be traversed.

Specified by:
getSubtreeIdsToVisit in class VisitContext
Parameters:
component - a NamingContainer component
Returns:
an unmodifiable Collection containing the client ids of any components underneath the NamingContainer that are known to be targets of the tree visit. If no such components exist, returns an empty Collection. If all components underneath the NamingContainer should be visited, returns the VisitContext.ALL_IDS collection.

invokeVisitCallback

public VisitResult invokeVisitCallback(UIComponent component,
                                       VisitCallback callback)
Description copied from class: VisitContext

Called by UIComponent.visitTree() to visit a single component.

Specified by:
invokeVisitCallback in class VisitContext
Parameters:
component - the component to visit
callback - the VisitCallback to call
Returns:
a VisitResult value that indicates whether to continue visiting the component's subtree, skip visiting the component's subtree or abort the visit altogether.

getWrapped

public abstract VisitContext getWrapped()
Description copied from interface: FacesWrapper

A class that implements this interface uses this method to return an instance of the class being wrapped.

Specified by:
getWrapped in interface FacesWrapper<VisitContext>


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