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 package javax.faces.view;
 import java.util.List;

ViewMetadata is reponsible for extracting and providing view parameter metadata from VDL views. Because ViewDeclarationLanguage.getViewMetadata(javax.faces.context.FacesContext,java.lang.String) is required to return null for JSP views and non-null for views authored in Facelets for JSF 2, this specification only applys to Facelets for JSF 2.

 public abstract class ViewMetadata {


the view ID for which this ViewMetadata instance was created
     public abstract String getViewId();


Creates a new javax.faces.component.UIViewRoot containing only view parameter metadata. The processing of building this UIViewRoot with metadata should not cause any events to be published to the application. The implementation must call javax.faces.context.FacesContext.setProcessingEvents(boolean) passing false as the argument, at the beginning of the method, and pass true to the same method at the end. The implementation must ensure that this happens regardless of ant exceptions that may be thrown.

context the javax.faces.context.FacesContext for the current request
a UIViewRoot containing only view parameter metadata (if any)
     public abstract UIViewRoot createMetadataView(FacesContext context);


Utility method to extract view metadata from the provided javax.faces.component.UIViewRoot.

root the javax.faces.component.UIViewRoot from which the metadata will be extracted from
a Collection of javax.faces.component.UIViewParameter instances. If the view has no metadata, the collection will be empty.
    public static Collection<UIViewParametergetViewParameters(UIViewRoot root) {
        UIComponent metadataFacet = root.getFacet(.);
        if (metadataFacet == null) {
            params = Collections.emptyList();
        } else {
            params = new ArrayList<UIViewParameter>();
            List<UIComponentchildren = metadataFacet.getChildren();
            int len = children.size();
            for (int i = 0; i < leni++) {
                UIComponent c = children.get(i);
                if (c instanceof UIViewParameter) {
        return params;
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