The equipment JSF component is designed to display snapshot images
of the visible area of an underlying
IlpEquipment
component. It works in conjunction with a dedicated servlet
responsible for rendering static images of an IlpEquipmentView. The component by itself is
not able to process any user interaction; it must be connected to
other JSF components, like the select interactor ( selectInteractor), in order to convert
client-side interactions into server-side events.
Class overview
The equipment JSF component is declared in the tag library
descriptor (
.tld
) file as
equipmentView
. Like any JSF component, it has a tag implementation, a
component implementation, and a JavaScript renderer; in addition,
the equipment JSF component has a dedicated servlet to handle
image requests. The classes are as follows:
- IltFacesEquipmentViewTag: The tag implementation
- IltFacesEquipmentView: The JSF component implementation
- IltFacesEquipmentViewRenderer: The renderer for the component
- IltFacesEquipmentServlet: A dedicated servlet to produce images
The tag implementation handles the various tag attributes
declared in the tag library descriptor file for the
equipmentView
component. The component implementation handles all this
information so that the renderer can create a JavaScript
representation of it while the image servlet processes the client
requests, directly interacting with the underlying
IlpEquipment
component and modules through its API. The following class
diagram shows these dependencies:
Equipment JSF architecture