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.DefaultParty;
  42 import net.pterodactylus.demoscenemusic.data.Party;
  43 import net.pterodactylus.demoscenemusic.data.Properties;
  44 import net.pterodactylus.demoscenemusic.data.Style;
  45 import net.pterodactylus.demoscenemusic.data.Track;
  46 import net.pterodactylus.demoscenemusic.data.TrackDerivative;
  47 import net.pterodactylus.demoscenemusic.data.User;
  48 import net.pterodactylus.demoscenemusic.page.ServletRequest;
  49 import net.pterodactylus.demoscenemusic.template.ConciseNumberFilter;
  50 import net.pterodactylus.demoscenemusic.template.DurationFilter;
  51 import net.pterodactylus.demoscenemusic.template.PropertiesAccessor;
  52 import net.pterodactylus.demoscenemusic.template.TrackDerivativeAccessor;
  53 import net.pterodactylus.demoscenemusic.template.UserAccessor;
  54 import net.pterodactylus.util.io.Closer;
  55 import net.pterodactylus.util.io.StreamCopier;
  56 import net.pterodactylus.util.template.ClassPathTemplateProvider;
  57 import net.pterodactylus.util.template.CollectionSortFilter;
  58 import net.pterodactylus.util.template.HtmlFilter;
  59 import net.pterodactylus.util.template.MatchFilter;
  60 import net.pterodactylus.util.template.ReflectionAccessor;
  61 import net.pterodactylus.util.template.Template;
  62 import net.pterodactylus.util.template.TemplateContextFactory;
  63 import net.pterodactylus.util.template.TemplateParser;
  64 import net.pterodactylus.util.web.Header;
  65 import net.pterodactylus.util.web.Page;
  66 import net.pterodactylus.util.web.Response;
  67
  68 /**
  69  * TODO
  70  *
  71  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  72  */
  73 public class TemplateServlet extends HttpServlet {
  74
  75         private Core core;
  76
  77         private final TemplateContextFactory templateContextFactory = new TemplateContextFactory();
  78
  79         private final Map<String, Page<ServletRequest>> pages = new HashMap<String, Page<ServletRequest>>();
  80
  81         //
  82         // SERVLET METHODS
  83         //
  84
  85         /**
  86          * {@inheritDoc}
  87          */
  88         @Override
  89         public void init(ServletConfig config) throws ServletException {
  90                 super.init(config);
  91                 core = (Core) config.getServletContext().getAttribute("core");
  92
  93                 templateContextFactory.addAccessor(Object.class, new ReflectionAccessor());
  94                 templateContextFactory.addAccessor(User.class, new UserAccessor());
  95                 templateContextFactory.addAccessor(Properties.class, new PropertiesAccessor());
  96                 templateContextFactory.addAccessor(TrackDerivative.class, new TrackDerivativeAccessor());
  97
  98                 templateContextFactory.addFilter("html", new HtmlFilter());
  99                 CollectionSortFilter sortFilter = new CollectionSortFilter();
 100                 sortFilter.addComparator(Artist.class, new Comparator<Artist>() {
 101
 102                         @Override
 103                         public int compare(Artist leftArtist, Artist rightArtist) {
 104                                 return leftArtist.getName().compareToIgnoreCase(rightArtist.getName());
 105                         }
 106
 107                 });
 108                 sortFilter.addComparator(Track.class, new Comparator<Track>() {
 109
 110                         @Override
 111                         public int compare(Track leftTrack, Track rightTrack) {
 112                                 return leftTrack.getName().compareToIgnoreCase(rightTrack.getName());
 113                         }
 114
 115                 });
 116                 sortFilter.addComparator(Style.class, new Comparator<Style>() {
 117
 118                         @Override
 119                         public int compare(Style leftStyle, Style rightStyle) {
 120                                 return leftStyle.getName().compareToIgnoreCase(rightStyle.getName());
 121                         }
 122
 123                 });
 124                 sortFilter.addComparator(Party.class, DefaultParty.NAME_YEAR_COMPARATOR);
 125                 templateContextFactory.addFilter("sort", sortFilter);
 126                 templateContextFactory.addFilter("matches", new MatchFilter());
 127                 templateContextFactory.addFilter("time", new DurationFilter());
 128                 templateContextFactory.addFilter("concise", new ConciseNumberFilter());
 129
 130                 templateContextFactory.addTemplateObject("core", core);
 131                 templateContextFactory.addTemplateObject("dataManager", core.getDataManager());
 132
 133                 templateContextFactory.addProvider(new ClassPathTemplateProvider(getClass(), "/templates/"));
 134
 135                 for (@SuppressWarnings("rawtypes")
 136                 Enumeration parameterNames = config.getInitParameterNames(); parameterNames.hasMoreElements();) {
 137                         String pageName = (String) parameterNames.nextElement();
 138                         Template template = getTemplate(pageName);
 139                         String pageClassName = config.getInitParameter(pageName);
 140                         try {
 141                                 Class<?> pageClass = Class.forName(pageClassName);
 142                                 @SuppressWarnings("unchecked")
 143                                 Page<ServletRequest> page = (Page<ServletRequest>) pageClass.getConstructor(Core.class, TemplateContextFactory.class, Template.class).newInstance(core, templateContextFactory, template);
 144                                 pages.put(pageName, page);
 145                         } catch (ClassNotFoundException cnfe1) {
 146                                 cnfe1.printStackTrace();
 147                         } catch (IllegalArgumentException iae1) {
 148                                 iae1.printStackTrace();
 149                         } catch (SecurityException se1) {
 150                                 se1.printStackTrace();
 151                         } catch (InstantiationException ie1) {
 152                                 ie1.printStackTrace();
 153                         } catch (IllegalAccessException iae1) {
 154                                 iae1.printStackTrace();
 155                         } catch (InvocationTargetException ite1) {
 156                                 ite1.printStackTrace();
 157                         } catch (NoSuchMethodException nsme1) {
 158                                 nsme1.printStackTrace();
 159                         }
 160                 }
 161         }
 162
 163         /**
 164          * {@inheritDoc}
 165          */
 166         @Override
 167         protected void doGet(HttpServletRequest request, HttpServletResponse httpServletResponse) throws ServletException, IOException {
 168                 request.setCharacterEncoding("UTF-8");
 169                 String path = request.getPathInfo();
 170                 if (path.startsWith("/")) {
 171                         path = path.substring(1);
 172                 }
 173                 if ((path.length() == 0) || (path.endsWith("/"))) {
 174                         path += "index";
 175                 }
 176                 Page<ServletRequest> page = pages.get(path);
 177                 if (page != null) {
 178                         ServletRequest servletRequest;
 179                         try {
 180                                 servletRequest = new ServletRequest(request, this);
 181                         } catch (URISyntaxException use1) {
 182                                 throw new IOException("Could not create URI from " + request.getRequestURI(), use1);
 183                         }
 184                         ByteArrayOutputStream responseOutputBuffer = new ByteArrayOutputStream();
 185                         Response response = new Response(responseOutputBuffer);
 186                         response = page.handleRequest(servletRequest, response);
 187                         for (Header header : response.getHeaders()) {
 188                                 for (String value : header) {
 189                                         httpServletResponse.addHeader(header.getName(), value);
 190                                 }
 191                         }
 192                         httpServletResponse.setContentType(response.getContentType());
 193                         httpServletResponse.setStatus(response.getStatusCode());
 194                         StreamCopier.copy(new ByteArrayInputStream(responseOutputBuffer.toByteArray()), httpServletResponse.getOutputStream());
 195                         return;
 196                 }
 197         }
 198
 199         /**
 200          * {@inheritDoc}
 201          */
 202         @Override
 203         protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
 204                 doGet(httpServletRequest, httpServletResponse);
 205         }
 206
 207         //
 208         // PRIVATE METHODS
 209         //
 210
 211         private Template getTemplate(String pageName) {
 212                 InputStream templateInputStream = getClass().getResourceAsStream("/templates/" + pageName);
 213                 if (templateInputStream == null) {
 214                         return null;
 215                 }
 216                 Reader templateReader = null;
 217                 try {
 218                         templateReader = new InputStreamReader(templateInputStream, "UTF-8");
 219                         return TemplateParser.parse(templateReader);
 220                 } catch (UnsupportedEncodingException uee1) {
 221                         /* can not happen. */
 222                         throw new RuntimeException("Could not parse templates!", uee1);
 223                 } finally {
 224                         Closer.close(templateReader);
 225                         Closer.close(templateInputStream);
 226                 }
 227         }
 228
 229 }