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