Class ExtensionsInvoker<A extends Action>

All Implemented Interfaces:

public class ExtensionsInvoker<A extends Action>
extends Object
implements Iterable<A>
Object of this class handles a single invokation of the extensions for one or several extension points. Call Registry.useExtensions(ClientContext, ExtensionsFilter, String...) to create an invoker object. With this object you can iterate() over all actions created by the extensions, or use one of the render methods to render all actions automatically.

The renderDefault() method uses the default render objects registered with the extension points and/or extensions (see ExtensionPoint.getRendererFactory() and Extension.getRendererFactory()). Since the registration of rendering factories are optional, the renderDefault() method only works with extensions that have done so. If an action can't be associated with a renderer, an exception is thrown.

If there is no default rendering factory or if you want to override the default renderer, you can use the render(Renderer) method. This will force the use of the specified renderer for all extensions, ignoring all renderers set by extension points or extensions.

Last modified
$Date:2008-03-20 12:15:25 +0100 (Thu, 20 Mar 2008) $
  • Field Details

  • Constructor Details

  • Method Details

    • setClearErrors

      public void setClearErrors​(boolean clearErrors)
      Set a flag to indicate if existing errors should be cleared before an action is rendered. If this setting is not enabled (default) old errors are never cleared.
      clearErrors - TRUE to clear old errors, FALSE to keep them
    • getNumExtensions

      public int getNumExtensions()
      Get the number of enabled extensions in this invokation. Note that this number doesn't have to correspond to the actual number of actions since an extension may choose to create 0, 1 or more actions.
      The number of enabled extensions
    • iterate

      public ActionIterator<A> iterate()
      Create an iterator that iterates over all Action:s created by the extensions. The iterator may return zero actions if none has been created.
      An iterator
    • renderDefault

      public void renderDefault()
      Render all actions using the renderers created by the default renderer factories as specified by the registered extension points and/or extensions.
      See Also:
      ExtensionPoint.getRendererFactory(), Extension.getRendererFactory()
    • renderDefault

      public void renderDefault​(WrappingRenderer<A> wrapper)
      Render all actions by wrapping the default renderers by the given wrapping renderer.
      wrapper - A wrapping renderer, or null to not wrap the default renderers
    • render

      public void render​(Renderer<A> renderer)
      Render all actions using a specific renderer. The given renderer will be used even if an extension point has provided a renderer factory and disallowed overriding it.
      See Also:
      ExtensionPoint.getRendererFactory(), ExtensionPoint.allowRendererOverride()
    • renderWithEvent

      public void renderWithEvent​(Renderer<A> renderer, EventType event)
      Render all actions using a specific renderer and send the specified event to event handlers.
      event - The event to send or null to not send any event
    • iterator

      public Iterator<A> iterator()
      Specified by:
      iterator in interface Iterable<A extends Action>