src/main/java/net/pterodactylus/demoscenemusic/core/TemplateServlet.java

   1 /*
   2  * DemosceneMusic - TemplateServlet.java - Copyright © 2012 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.demoscenemusic.core;
  19
  20 import java.io.IOException;
  21 import java.io.InputStream;
  22 import java.io.InputStreamReader;
  23 import java.io.Reader;
  24 import java.io.UnsupportedEncodingException;
  25 import java.lang.reflect.InvocationTargetException;
  26 import java.net.URISyntaxException;
  27 import java.util.Enumeration;
  28 import java.util.HashMap;
  29 import java.util.Map;
  30
  31 import javax.servlet.ServletConfig;
  32 import javax.servlet.ServletException;
  33 import javax.servlet.http.HttpServlet;
  34 import javax.servlet.http.HttpServletRequest;
  35 import javax.servlet.http.HttpServletResponse;
  36
  37 import net.pterodactylus.demoscenemusic.page.ServletRequest;
  38 import net.pterodactylus.util.io.Closer;
  39 import net.pterodactylus.util.template.Template;
  40 import net.pterodactylus.util.template.TemplateContextFactory;
  41 import net.pterodactylus.util.template.TemplateParser;
  42 import net.pterodactylus.util.web.Header;
  43 import net.pterodactylus.util.web.Page;
  44 import net.pterodactylus.util.web.Response;
  45
  46 /**
  47  * TODO
  48  *
  49  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  50  */
  51 public class TemplateServlet extends HttpServlet {
  52
  53         private Core core;
  54         private final TemplateContextFactory templateContextFactory = new TemplateContextFactory();
  55
  56         private final Map<String, Page<ServletRequest>> pages = new HashMap<String, Page<ServletRequest>>();
  57
  58         //
  59         // SERVLET METHODS
  60         //
  61
  62         /**
  63          * {@inheritDoc}
  64          */
  65         @Override
  66         public void init(ServletConfig config) throws ServletException {
  67                 super.init(config);
  68                 core = (Core) config.getServletContext().getAttribute("core");
  69
  70                 templateContextFactory.addTemplateObject("core", core);
  71                 templateContextFactory.addTemplateObject("dataManager", core.getDataManager());
  72
  73                 for (@SuppressWarnings("rawtypes")
  74                 Enumeration parameterNames = config.getInitParameterNames(); parameterNames.hasMoreElements();) {
  75                         String pageName = (String) parameterNames.nextElement();
  76                         Template template = getTemplate(pageName);
  77                         String pageClassName = config.getInitParameter(pageName);
  78                         try {
  79                                 Class<?> pageClass = Class.forName(pageClassName);
  80                                 @SuppressWarnings("unchecked")
  81                                 Page<ServletRequest> page = (Page<ServletRequest>) pageClass.getConstructor(Core.class, TemplateContextFactory.class, Template.class).newInstance(core, templateContextFactory, template);
  82                                 pages.put(pageName, page);
  83                         } catch (ClassNotFoundException cnfe1) {
  84                                 cnfe1.printStackTrace();
  85                         } catch (IllegalArgumentException iae1) {
  86                                 iae1.printStackTrace();
  87                         } catch (SecurityException se1) {
  88                                 se1.printStackTrace();
  89                         } catch (InstantiationException ie1) {
  90                                 ie1.printStackTrace();
  91                         } catch (IllegalAccessException iae1) {
  92                                 iae1.printStackTrace();
  93                         } catch (InvocationTargetException ite1) {
  94                                 ite1.printStackTrace();
  95                         } catch (NoSuchMethodException nsme1) {
  96                                 nsme1.printStackTrace();
  97                         }
  98                 }
  99         }
 100
 101         /**
 102          * {@inheritDoc}
 103          */
 104         @Override
 105         protected void doGet(HttpServletRequest request, HttpServletResponse httpServletResponse) throws ServletException, IOException {
 106                 String path = request.getPathInfo();
 107                 if (path.startsWith("/")) {
 108                         path = path.substring(1);
 109                 }
 110                 Page<ServletRequest> page = pages.get(path);
 111                 if (page != null) {
 112                         ServletRequest servletRequest;
 113                         try {
 114                                 servletRequest = new ServletRequest(request);
 115                         } catch (URISyntaxException use1) {
 116                                 throw new IOException("Could not create URI from " + request.getRequestURI(), use1);
 117                         }
 118                         Response response = new Response(httpServletResponse.getOutputStream());
 119                         response = page.handleRequest(servletRequest, response);
 120                         for (Header header : response.getHeaders()) {
 121                                 for (String value : header) {
 122                                         httpServletResponse.addHeader(header.getName(), value);
 123                                 }
 124                         }
 125                         httpServletResponse.setContentType(response.getContentType());
 126                         httpServletResponse.setStatus(response.getStatusCode());
 127                         return;
 128                 }
 129         }
 130
 131         //
 132         // PRIVATE METHODS
 133         //
 134
 135         private Template getTemplate(String pageName) {
 136                 InputStream templateInputStream = getClass().getResourceAsStream("/templates/" + pageName);
 137                 if (templateInputStream == null) {
 138                         return null;
 139                 }
 140                 Reader templateReader = null;
 141                 try {
 142                         templateReader = new InputStreamReader(templateInputStream, "UTF-8");
 143                         return TemplateParser.parse(templateReader);
 144                 } catch (UnsupportedEncodingException uee1) {
 145                         /* can not happen. */
 146                         throw new RuntimeException("Could not parse templates!", uee1);
 147                 } finally {
 148                         Closer.close(templateReader);
 149                         Closer.close(templateInputStream);
 150                 }
 151         }
 152
 153 }