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