/* Copyright (c) 2006 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 sample.gbase.recipe;
import com.google.api.gbase.client.FeedURLFactory;
import com.google.api.gbase.client.GoogleBaseEntry;
import com.google.api.gbase.client.GoogleBaseService;
import com.google.gdata.util.ServiceException;
import java.io.IOException;
import java.net.URL;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Displays a recipe.
*/
@SuppressWarnings("serial")
public class RecipeDisplayServlet extends HttpServlet {
public static final String DISPLAY_JSP = "/WEB-INF/recipeDisplay.jsp";
protected FeedURLFactory urlFactory;
@Override
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
ServletContext context = servletConfig.getServletContext();
urlFactory = (FeedURLFactory)
context.getAttribute(RecipeListener.FEED_URL_FACTORY_ATTRIBUTE);
}
@Override
public void destroy() {
super.destroy();
}
/**
* Shows the page for displaying a Recipe.
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// This is a public page, so we use a simple, nonauthenticated service
GoogleBaseService service = RecipeUtil.getGoogleBaseService(request,
this.getServletContext());
String id = request.getParameter(RecipeUtil.ID_PARAMETER);
recipeDisplay(request, response, service, id);
}
/**
* Retrieves a recipe and forwards the request
* to the {@link #DISPLAY_JSP} jsp page that displays the recipe.
*
* @param request
* @param response
* @param service the service used to retrieve the recipe
* @param id the id of the recipe
*/
private void recipeDisplay(HttpServletRequest request,
HttpServletResponse response,
GoogleBaseService service,
String id)
throws ServletException, IOException {
GoogleBaseEntry entry;
try {
URL feedUrl = urlFactory.getSnippetsEntryURL(id);
entry = service.getEntry(feedUrl, GoogleBaseEntry.class);
} catch (ServiceException e) {
RecipeUtil.logServiceException(this, e);
RecipeUtil.forwardToErrorPage(request, response, e);
return;
}
Recipe recipe = new Recipe(entry);
request.setAttribute(RecipeUtil.RECIPE_ATTRIBUTE, recipe);
RecipeSearch results = new RecipeSearch(service, urlFactory, false);
RecipeUtil.setRecipeSearch(request, results);
// Forward to the JSP
request.getRequestDispatcher(DISPLAY_JSP).forward(request, response);
}
}