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.HtmlFilter;
  40 import net.pterodactylus.util.template.ReflectionAccessor;
  41 import net.pterodactylus.util.template.Template;
  42 import net.pterodactylus.util.template.TemplateContextFactory;
  43 import net.pterodactylus.util.template.TemplateParser;
  44 import net.pterodactylus.util.web.Header;
  45 import net.pterodactylus.util.web.Page;
  46 import net.pterodactylus.util.web.Response;
  47
  48 /**
  49  * TODO
  50  *
  51  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  52  */
  53 public class TemplateServlet extends HttpServlet {
  54
  55         private Core core;
  56         private final TemplateContextFactory templateContextFactory = new TemplateContextFactory();
  57
  58         private final Map<String, Page<ServletRequest>> pages = new HashMap<String, Page<ServletRequest>>();
  59
  60         //
  61         // SERVLET METHODS
  62         //
  63
  64         /**
  65          * {@inheritDoc}
  66          */
  67         @Override
  68         public void init(ServletConfig config) throws ServletException {
  69                 super.init(config);
  70                 core = (Core) config.getServletContext().getAttribute("core");
  71
  72                 templateContextFactory.addAccessor(Object.class, new ReflectionAccessor());
  73
  74                 templateContextFactory.addFilter("html", new HtmlFilter());
  75
  76                 templateContextFactory.addTemplateObject("core", core);
  77                 templateContextFactory.addTemplateObject("dataManager", core.getDataManager());
  78
  79                 for (@SuppressWarnings("rawtypes")
  80                 Enumeration parameterNames = config.getInitParameterNames(); parameterNames.hasMoreElements();) {
  81                         String pageName = (String) parameterNames.nextElement();
  82                         Template template = getTemplate(pageName);
  83                         String pageClassName = config.getInitParameter(pageName);
  84                         try {
  85                                 Class<?> pageClass = Class.forName(pageClassName);
  86                                 @SuppressWarnings("unchecked")
  87                                 Page<ServletRequest> page = (Page<ServletRequest>) pageClass.getConstructor(Core.class, TemplateContextFactory.class, Template.class).newInstance(core, templateContextFactory, template);
  88                                 pages.put(pageName, page);
  89                         } catch (ClassNotFoundException cnfe1) {
  90                                 cnfe1.printStackTrace();
  91                         } catch (IllegalArgumentException iae1) {
  92                                 iae1.printStackTrace();
  93                         } catch (SecurityException se1) {
  94                                 se1.printStackTrace();
  95                         } catch (InstantiationException ie1) {
  96                                 ie1.printStackTrace();
  97                         } catch (IllegalAccessException iae1) {
  98                                 iae1.printStackTrace();
  99                         } catch (InvocationTargetException ite1) {
 100                                 ite1.printStackTrace();
 101                         } catch (NoSuchMethodException nsme1) {
 102                                 nsme1.printStackTrace();
 103                         }
 104                 }
 105         }
 106
 107         /**
 108          * {@inheritDoc}
 109          */
 110         @Override
 111         protected void doGet(HttpServletRequest request, HttpServletResponse httpServletResponse) throws ServletException, IOException {
 112                 String path = request.getPathInfo();
 113                 if (path.startsWith("/")) {
 114                         path = path.substring(1);
 115                 }
 116                 Page<ServletRequest> page = pages.get(path);
 117                 if (page != null) {
 118                         ServletRequest servletRequest;
 119                         try {
 120                                 servletRequest = new ServletRequest(request);
 121                         } catch (URISyntaxException use1) {
 122                                 throw new IOException("Could not create URI from " + request.getRequestURI(), use1);
 123                         }
 124                         Response response = new Response(httpServletResponse.getOutputStream());
 125                         response = page.handleRequest(servletRequest, response);
 126                         for (Header header : response.getHeaders()) {
 127                                 for (String value : header) {
 128                                         httpServletResponse.addHeader(header.getName(), value);
 129                                 }
 130                         }
 131                         httpServletResponse.setContentType(response.getContentType());
 132                         httpServletResponse.setStatus(response.getStatusCode());
 133                         return;
 134                 }
 135         }
 136
 137         //
 138         // PRIVATE METHODS
 139         //
 140
 141         private Template getTemplate(String pageName) {
 142                 InputStream templateInputStream = getClass().getResourceAsStream("/templates/" + pageName);
 143                 if (templateInputStream == null) {
 144                         return null;
 145                 }
 146                 Reader templateReader = null;
 147                 try {
 148                         templateReader = new InputStreamReader(templateInputStream, "UTF-8");
 149                         return TemplateParser.parse(templateReader);
 150                 } catch (UnsupportedEncodingException uee1) {
 151                         /* can not happen. */
 152                         throw new RuntimeException("Could not parse templates!", uee1);
 153                 } finally {
 154                         Closer.close(templateReader);
 155                         Closer.close(templateInputStream);
 156                 }
 157         }
 158
 159 }