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.ByteArrayInputStream;
  21 import java.io.ByteArrayOutputStream;
  22 import java.io.IOException;
  23 import java.io.InputStream;
  24 import java.io.InputStreamReader;
  25 import java.io.Reader;
  26 import java.io.UnsupportedEncodingException;
  27 import java.lang.reflect.InvocationTargetException;
  28 import java.net.URISyntaxException;
  29 import java.util.Comparator;
  30 import java.util.Enumeration;
  31 import java.util.HashMap;
  32 import java.util.Map;
  33
  34 import javax.servlet.ServletConfig;
  35 import javax.servlet.ServletException;
  36 import javax.servlet.http.HttpServlet;
  37 import javax.servlet.http.HttpServletRequest;
  38 import javax.servlet.http.HttpServletResponse;
  39
  40 import net.pterodactylus.demoscenemusic.data.Artist;
  41 import net.pterodactylus.demoscenemusic.data.Properties;
  42 import net.pterodactylus.demoscenemusic.data.Style;
  43 import net.pterodactylus.demoscenemusic.data.Track;
  44 import net.pterodactylus.demoscenemusic.data.User;
  45 import net.pterodactylus.demoscenemusic.page.ServletRequest;
  46 import net.pterodactylus.demoscenemusic.template.PropertiesAccessor;
  47 import net.pterodactylus.demoscenemusic.template.UserAccessor;
  48 import net.pterodactylus.util.io.Closer;
  49 import net.pterodactylus.util.io.StreamCopier;
  50 import net.pterodactylus.util.template.ClassPathTemplateProvider;
  51 import net.pterodactylus.util.template.CollectionSortFilter;
  52 import net.pterodactylus.util.template.HtmlFilter;
  53 import net.pterodactylus.util.template.ReflectionAccessor;
  54 import net.pterodactylus.util.template.Template;
  55 import net.pterodactylus.util.template.TemplateContextFactory;
  56 import net.pterodactylus.util.template.TemplateParser;
  57 import net.pterodactylus.util.web.Header;
  58 import net.pterodactylus.util.web.Page;
  59 import net.pterodactylus.util.web.Response;
  60
  61 /**
  62  * TODO
  63  *
  64  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  65  */
  66 public class TemplateServlet extends HttpServlet {
  67
  68         private Core core;
  69         private final TemplateContextFactory templateContextFactory = new TemplateContextFactory();
  70
  71         private final Map<String, Page<ServletRequest>> pages = new HashMap<String, Page<ServletRequest>>();
  72
  73         //
  74         // SERVLET METHODS
  75         //
  76
  77         /**
  78          * {@inheritDoc}
  79          */
  80         @Override
  81         public void init(ServletConfig config) throws ServletException {
  82                 super.init(config);
  83                 core = (Core) config.getServletContext().getAttribute("core");
  84
  85                 templateContextFactory.addAccessor(Object.class, new ReflectionAccessor());
  86                 templateContextFactory.addAccessor(User.class, new UserAccessor());
  87                 templateContextFactory.addAccessor(Properties.class, new PropertiesAccessor());
  88
  89                 templateContextFactory.addFilter("html", new HtmlFilter());
  90                 CollectionSortFilter sortFilter = new CollectionSortFilter();
  91                 sortFilter.addComparator(Artist.class, new Comparator<Artist>() {
  92
  93                         @Override
  94                         public int compare(Artist leftArtist, Artist rightArtist) {
  95                                 return leftArtist.getName().compareToIgnoreCase(rightArtist.getName());
  96                         }
  97
  98                 });
  99                 sortFilter.addComparator(Track.class, new Comparator<Track>() {
 100
 101                         @Override
 102                         public int compare(Track leftTrack, Track rightTrack) {
 103                                 return leftTrack.getName().compareToIgnoreCase(rightTrack.getName());
 104                         }
 105
 106                 });
 107                 sortFilter.addComparator(Style.class, new Comparator<Style>() {
 108
 109                         @Override
 110                         public int compare(Style leftStyle, Style rightStyle) {
 111                                 return leftStyle.getName().compareToIgnoreCase(rightStyle.getName());
 112                         }
 113
 114                 });
 115                 templateContextFactory.addFilter("sort", sortFilter);
 116
 117                 templateContextFactory.addTemplateObject("core", core);
 118                 templateContextFactory.addTemplateObject("dataManager", core.getDataManager());
 119
 120                 templateContextFactory.addProvider(new ClassPathTemplateProvider(getClass(), "/templates/"));
 121
 122                 for (@SuppressWarnings("rawtypes")
 123                 Enumeration parameterNames = config.getInitParameterNames(); parameterNames.hasMoreElements();) {
 124                         String pageName = (String) parameterNames.nextElement();
 125                         Template template = getTemplate(pageName);
 126                         String pageClassName = config.getInitParameter(pageName);
 127                         try {
 128                                 Class<?> pageClass = Class.forName(pageClassName);
 129                                 @SuppressWarnings("unchecked")
 130                                 Page<ServletRequest> page = (Page<ServletRequest>) pageClass.getConstructor(Core.class, TemplateContextFactory.class, Template.class).newInstance(core, templateContextFactory, template);
 131                                 pages.put(pageName, page);
 132                         } catch (ClassNotFoundException cnfe1) {
 133                                 cnfe1.printStackTrace();
 134                         } catch (IllegalArgumentException iae1) {
 135                                 iae1.printStackTrace();
 136                         } catch (SecurityException se1) {
 137                                 se1.printStackTrace();
 138                         } catch (InstantiationException ie1) {
 139                                 ie1.printStackTrace();
 140                         } catch (IllegalAccessException iae1) {
 141                                 iae1.printStackTrace();
 142                         } catch (InvocationTargetException ite1) {
 143                                 ite1.printStackTrace();
 144                         } catch (NoSuchMethodException nsme1) {
 145                                 nsme1.printStackTrace();
 146                         }
 147                 }
 148         }
 149
 150         /**
 151          * {@inheritDoc}
 152          */
 153         @Override
 154         protected void doGet(HttpServletRequest request, HttpServletResponse httpServletResponse) throws ServletException, IOException {
 155                 request.setCharacterEncoding("UTF-8");
 156                 String path = request.getPathInfo();
 157                 if (path.startsWith("/")) {
 158                         path = path.substring(1);
 159                 }
 160                 if ((path.length() == 0) || (path.endsWith("/"))) {
 161                         path += "index";
 162                 }
 163                 Page<ServletRequest> page = pages.get(path);
 164                 if (page != null) {
 165                         ServletRequest servletRequest;
 166                         try {
 167                                 servletRequest = new ServletRequest(request, this);
 168                         } catch (URISyntaxException use1) {
 169                                 throw new IOException("Could not create URI from " + request.getRequestURI(), use1);
 170                         }
 171                         ByteArrayOutputStream responseOutputBuffer = new ByteArrayOutputStream();
 172                         Response response = new Response(responseOutputBuffer);
 173                         response = page.handleRequest(servletRequest, response);
 174                         for (Header header : response.getHeaders()) {
 175                                 for (String value : header) {
 176                                         httpServletResponse.addHeader(header.getName(), value);
 177                                 }
 178                         }
 179                         httpServletResponse.setContentType(response.getContentType());
 180                         httpServletResponse.setStatus(response.getStatusCode());
 181                         StreamCopier.copy(new ByteArrayInputStream(responseOutputBuffer.toByteArray()), httpServletResponse.getOutputStream());
 182                         return;
 183                 }
 184         }
 185
 186         /**
 187          * {@inheritDoc}
 188          */
 189         @Override
 190         protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
 191                 doGet(httpServletRequest, httpServletResponse);
 192         }
 193
 194         //
 195         // PRIVATE METHODS
 196         //
 197
 198         private Template getTemplate(String pageName) {
 199                 InputStream templateInputStream = getClass().getResourceAsStream("/templates/" + pageName);
 200                 if (templateInputStream == null) {
 201                         return null;
 202                 }
 203                 Reader templateReader = null;
 204                 try {
 205                         templateReader = new InputStreamReader(templateInputStream, "UTF-8");
 206                         return TemplateParser.parse(templateReader);
 207                 } catch (UnsupportedEncodingException uee1) {
 208                         /* can not happen. */
 209                         throw new RuntimeException("Could not parse templates!", uee1);
 210                 } finally {
 211                         Closer.close(templateReader);
 212                         Closer.close(templateInputStream);
 213                 }
 214         }
 215
 216 }