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 package javax.faces.view;

ViewDeclarationLanguageFactory is a factory object that creates (if needed) and returns a new ViewDeclarationLanguage instance based on the VDL found in a specific view.

There must be one ViewDeclarationLanguageFactory instance per web application that is utilizing JavaServer Faces. This instance can be acquired, in a portable manner, by calling:

   ViewDeclarationLanguageFactory factory = (ViewDeclarationLanguageFactory)

 public abstract class ViewDeclarationLanguageFactory implements FacesWrapper<ViewDeclarationLanguageFactory> {


If this factory has been decorated, the implementation doing the decorating may override this method to provide access to the implementation being wrapped. A default implementation is provided that returns null.

         return null;


Return the ViewDeclarationLanguage instance suitable for handling the VDL contained in the page referenced by the argument viewId. The default implementation must return a valid ViewDeclarationLanguage instance for views written in either JSP, Faces XML Views, or Facelets for JSF 2.

viewId the viewId to be inspected for an appropriate ViewDeclarationLanguage implementation for the VDL used in the view.
java.lang.NullPointerException if viewId is null.
    public abstract ViewDeclarationLanguage getViewDeclarationLanguage(String viewId);
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