/**
* Gets the <code>Action</code> specified by the mapping type from a PicoContainer. The action
* will be instantiated if necessary, and its dependencies will be injected. The action will be
* instantiated via a special PicoContainer that just contains actions. If this container already
* exists in the request attribute, this method will use it. If no such container exists, this
* method will create a new Pico container and place it in the request. The parent container will
* either be the request container, or if that container can not be found the session container,
* or if that container can not be found, the application container. If no parent container can be
* found, a <code>PicoInitializationException</code> will be thrown. The action path specified in
* the mapping is used as the component key for the action.
*
* @param request the Http servlet request.
* @param mapping the Struts mapping object, whose type property tells us what Action class is
* required.
* @param servlet the Struts <code>ActionServlet</code>.
* @return the <code>Action</code> instance.
* @throws PicoIntrospectionException if the mapping type does not specify a valid action.
* @throws PicoInitializationException if no request, session, or application scoped Pico
* container can be found.
*/
public Action processAction(
HttpServletRequest request, ActionMapping mapping, ActionServlet servlet)
throws PicoIntrospectionException, PicoInitializationException {
Object actionKey = mapping.getPath();
Class actionType = getActionClass(mapping.getType());
Action action = (Action) sf.getService(actionKey);
if (action == null) {
sf.registerService(actionKey, actionType);
action = (Action) sf.getService(actionKey);
}
action.setServlet(servlet);
return action;
}
/** * Uses PicoContainer to produce Actions and inject dependencies into them. If you have your own * <code>RequestProcessor</code> implementation, you can use an <code>ActionFactory</code> in your * <code>RequestProcessor.processActionCreate</code> method to Picofy your Actions. * * @author Stephen Molitor * @author Mauro Talevi * @author <a href="mailto:[email protected]">Peter Cheng </a> * @version $Revision: 1.1 $ $Date: 2006/02/15 08:45:44 $ * @version Revision: 1.0 */ public class ActionFactory { private ServiceFactory sf = ServiceFactory.getInstance(); private Map classCache = new HashMap(); /** * Gets the <code>Action</code> specified by the mapping type from a PicoContainer. The action * will be instantiated if necessary, and its dependencies will be injected. The action will be * instantiated via a special PicoContainer that just contains actions. If this container already * exists in the request attribute, this method will use it. If no such container exists, this * method will create a new Pico container and place it in the request. The parent container will * either be the request container, or if that container can not be found the session container, * or if that container can not be found, the application container. If no parent container can be * found, a <code>PicoInitializationException</code> will be thrown. The action path specified in * the mapping is used as the component key for the action. * * @param request the Http servlet request. * @param mapping the Struts mapping object, whose type property tells us what Action class is * required. * @param servlet the Struts <code>ActionServlet</code>. * @return the <code>Action</code> instance. * @throws PicoIntrospectionException if the mapping type does not specify a valid action. * @throws PicoInitializationException if no request, session, or application scoped Pico * container can be found. */ public Action processAction( HttpServletRequest request, ActionMapping mapping, ActionServlet servlet) throws PicoIntrospectionException, PicoInitializationException { Object actionKey = mapping.getPath(); Class actionType = getActionClass(mapping.getType()); Action action = (Action) sf.getService(actionKey); if (action == null) { sf.registerService(actionKey, actionType); action = (Action) sf.getService(actionKey); } action.setServlet(servlet); return action; } /** * Load class. * * @param className * @return the class * @throws PicoIntrospectionException */ private Class getActionClass(String className) throws PicoIntrospectionException { try { return loadClass(className); } catch (ClassNotFoundException e) { throw new PicoIntrospectionException("Action class '" + className + "' not found", e); } } /** * Load class with given name. * * @param className * @return the class * @throws ClassNotFoundException */ private Class loadClass(String className) throws ClassNotFoundException { if (classCache.containsKey(className)) { return (Class) classCache.get(className); } else { ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); Class result = classLoader.loadClass(className); classCache.put(className, result); return result; } } }
