Package jakarta.faces.render

Class RenderKit

  • Direct Known Subclasses:
    RenderKitWrapper
    public abstract class RenderKit
extends Object

    RenderKit represents a collection of Renderer instances that, together, know how to render Jakarta Faces UIComponent instances for a specific client. Typically, RenderKits are specialized for some combination of client device type, markup language, and/or user Locale. A RenderKit also acts as a Factory for associated Renderer instances, which perform the actual rendering process for each component.

    A typical Jakarta Faces implementation will configure one or more RenderKit instances at web application startup. They are made available through calls to the getRenderKit() methods of RenderKitFactory. Because RenderKit instances are shared, they must be implemented in a thread-safe manner. Due to limitations in the current specification having multiple RenderKit instances at play in the same application requires a custom ViewHandler instance that is aware of how to deal with this case. This limitation will be lifted in a future version of the spec.

    The RenderKit instance must also vend a ResponseStateManager instance, which is used in the process of saving and restoring tree structure and state.

    • Constructor Detail

      • RenderKit

        public RenderKit()

    • Method Detail

      • addRenderer

        public abstract void addRenderer​(String family,
                                 String rendererType,
                                 Renderer renderer)

        Register the specified Renderer instance, associated with the specified component family and rendererType, to the set of Renderers registered with this RenderKit, replacing any previously registered Renderer for this combination of identifiers.

        Parameters:
        family - Component family of the Renderer to register
        rendererType - Renderer type of the Renderer to register
        renderer - Renderer instance we are registering
        Throws:
        NullPointerException - if family or rendererType or renderer is null

      • getRenderer

        public abstract Renderer getRenderer​(String family,
                                     String rendererType)

        Return the Renderer instance most recently registered for the specified component family and rendererType, if any; otherwise, return null.

        Parameters:
        family - Component family of the requested Renderer instance
        rendererType - Renderer type of the requested Renderer instance
        Returns:
        the Renderer instance
        Throws:
        NullPointerException - if family or rendererType is null

      • createResponseWriter

        public abstract ResponseWriter createResponseWriter​(Writer writer,
                                                    String contentTypeList,
                                                    String characterEncoding)

        Use the provided Writer to create a new ResponseWriter instance for the specified (optional) content type, and character encoding.

        Implementors are advised to consult the getCharacterEncoding() method of class ServletResponse to get the required value for the characterEncoding for this method. Since the Writer for this response will already have been obtained (due to it ultimately being passed to this method), we know that the character encoding cannot change during the rendering of the response.

        Parameters:
        writer - the Writer around which this ResponseWriter must be built.
        contentTypeList - an "Accept header style" list of content types for this response, or null if the RenderKit should choose the best fit. As of the current version, the values accepted by the Standard render-kit for this parameter include any valid "Accept header style" String that includes the String text/html, application/xhtml+xml, application/xml or text/xml. This may change in a future version. The RenderKit must support a value for this argument that comes straight from the Accept HTTP header, and therefore requires parsing according to the specification of the Accept header. Please see Section 14.1 of RFC 2616 for the specification of the Accept header.
        characterEncoding - such as "ISO-8859-1" for this ResponseWriter, or null if the RenderKit should choose the best fit. Please see the IANA for a list of character encodings.
        Returns:
        a new ResponseWriter.
        Throws:
        IllegalArgumentException - if no matching content type can be found in contentTypeList, no appropriate content type can be found with the implementation dependent best fit algorithm, or no matching character encoding can be found for the argument characterEncoding.

      • getComponentFamilies

        public Iterator<String> getComponentFamilies()

        Return an Iterator over the component-family entries supported by this RenderKit instance.

        The default implementation of this method returns an empty Iterator

        Returns:
        Return an Iterator over the component-family entries
        Since:
        2.0

      • getRendererTypes

        public Iterator<String> getRendererTypes​(String componentFamily)

        Return an Iterator over the renderer-type entries for the given component-family.

        If the specified componentFamily is not known to this RenderKit implementation, return an empty Iterator

        The default implementation of this method returns an empty Iterator

        Parameters:
        componentFamily - one of the members of the Iterator returned by getComponentFamilies().
        Returns:
        an Iterator over the renderer-type
        Since:
        2.0