| /** |
| * Copyright (C) 2007 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.inject.servlet; |
| |
| import com.google.inject.Injector; |
| import javax.servlet.ServletConfig; |
| import javax.servlet.ServletContext; |
| import javax.servlet.ServletException; |
| import javax.servlet.UnavailableException; |
| import javax.servlet.http.HttpServlet; |
| |
| /** |
| * Base class to be extended by all servlets that desire field and method |
| * injection to be performed during {@link javax.servlet.Servlet#init}. |
| * Constructor injection is not possible. To use this you must also |
| * register your own subclass of {@link GuiceServletContextListener} as a |
| * servlet context listener. |
| * |
| * @author Kevin Bourrillion (kevinb@google.com) |
| */ |
| public abstract class InjectedHttpServlet extends HttpServlet { |
| |
| @Override public void init(ServletConfig config) throws ServletException { |
| super.init(config); |
| ServletContext servletContext = config.getServletContext(); |
| Injector injector = (Injector) |
| servletContext.getAttribute(GuiceServletContextListener.INJECTOR_NAME); |
| if (injector == null) { |
| throw new UnavailableException( |
| "Guice Injector not found (did you forget to register a " |
| + GuiceServletContextListener.class.getSimpleName() + "?)"); |
| } |
| injector.injectMembers(this); |
| } |
| } |