2 * DemosceneMusic - TemplateServlet.java - Copyright © 2012 David Roden
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.
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.
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/>.
18 package net.pterodactylus.demoscenemusic.core;
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;
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;
40 import net.pterodactylus.demoscenemusic.data.Artist;
41 import net.pterodactylus.demoscenemusic.data.Track;
42 import net.pterodactylus.demoscenemusic.page.ServletRequest;
43 import net.pterodactylus.util.io.Closer;
44 import net.pterodactylus.util.io.StreamCopier;
45 import net.pterodactylus.util.template.ClassPathTemplateProvider;
46 import net.pterodactylus.util.template.CollectionSortFilter;
47 import net.pterodactylus.util.template.HtmlFilter;
48 import net.pterodactylus.util.template.ReflectionAccessor;
49 import net.pterodactylus.util.template.Template;
50 import net.pterodactylus.util.template.TemplateContextFactory;
51 import net.pterodactylus.util.template.TemplateParser;
52 import net.pterodactylus.util.web.Header;
53 import net.pterodactylus.util.web.Page;
54 import net.pterodactylus.util.web.Response;
59 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
61 public class TemplateServlet extends HttpServlet {
64 private final TemplateContextFactory templateContextFactory = new TemplateContextFactory();
66 private final Map<String, Page<ServletRequest>> pages = new HashMap<String, Page<ServletRequest>>();
76 public void init(ServletConfig config) throws ServletException {
78 core = (Core) config.getServletContext().getAttribute("core");
80 templateContextFactory.addAccessor(Object.class, new ReflectionAccessor());
82 templateContextFactory.addFilter("html", new HtmlFilter());
83 CollectionSortFilter sortFilter = new CollectionSortFilter();
84 sortFilter.addComparator(Artist.class, new Comparator<Artist>() {
87 public int compare(Artist leftArtist, Artist rightArtist) {
88 return leftArtist.name().compareToIgnoreCase(rightArtist.name());
92 sortFilter.addComparator(Track.class, new Comparator<Track>() {
95 public int compare(Track leftTrack, Track rightTrack) {
96 return leftTrack.name().compareToIgnoreCase(rightTrack.name());
100 templateContextFactory.addFilter("sort", sortFilter);
102 templateContextFactory.addTemplateObject("core", core);
103 templateContextFactory.addTemplateObject("dataManager", core.getDataManager());
105 templateContextFactory.addProvider(new ClassPathTemplateProvider(getClass(), "/templates/"));
107 for (@SuppressWarnings("rawtypes")
108 Enumeration parameterNames = config.getInitParameterNames(); parameterNames.hasMoreElements();) {
109 String pageName = (String) parameterNames.nextElement();
110 Template template = getTemplate(pageName);
111 String pageClassName = config.getInitParameter(pageName);
113 Class<?> pageClass = Class.forName(pageClassName);
114 @SuppressWarnings("unchecked")
115 Page<ServletRequest> page = (Page<ServletRequest>) pageClass.getConstructor(Core.class, TemplateContextFactory.class, Template.class).newInstance(core, templateContextFactory, template);
116 pages.put(pageName, page);
117 } catch (ClassNotFoundException cnfe1) {
118 cnfe1.printStackTrace();
119 } catch (IllegalArgumentException iae1) {
120 iae1.printStackTrace();
121 } catch (SecurityException se1) {
122 se1.printStackTrace();
123 } catch (InstantiationException ie1) {
124 ie1.printStackTrace();
125 } catch (IllegalAccessException iae1) {
126 iae1.printStackTrace();
127 } catch (InvocationTargetException ite1) {
128 ite1.printStackTrace();
129 } catch (NoSuchMethodException nsme1) {
130 nsme1.printStackTrace();
139 protected void doGet(HttpServletRequest request, HttpServletResponse httpServletResponse) throws ServletException, IOException {
140 String path = request.getPathInfo();
141 if (path.startsWith("/")) {
142 path = path.substring(1);
144 Page<ServletRequest> page = pages.get(path);
146 ServletRequest servletRequest;
148 servletRequest = new ServletRequest(request);
149 } catch (URISyntaxException use1) {
150 throw new IOException("Could not create URI from " + request.getRequestURI(), use1);
152 ByteArrayOutputStream responseOutputBuffer = new ByteArrayOutputStream();
153 Response response = new Response(responseOutputBuffer);
154 response = page.handleRequest(servletRequest, response);
155 for (Header header : response.getHeaders()) {
156 for (String value : header) {
157 httpServletResponse.addHeader(header.getName(), value);
160 httpServletResponse.setContentType(response.getContentType());
161 httpServletResponse.setStatus(response.getStatusCode());
162 StreamCopier.copy(new ByteArrayInputStream(responseOutputBuffer.toByteArray()), httpServletResponse.getOutputStream());
171 private Template getTemplate(String pageName) {
172 InputStream templateInputStream = getClass().getResourceAsStream("/templates/" + pageName);
173 if (templateInputStream == null) {
176 Reader templateReader = null;
178 templateReader = new InputStreamReader(templateInputStream, "UTF-8");
179 return TemplateParser.parse(templateReader);
180 } catch (UnsupportedEncodingException uee1) {
181 /* can not happen. */
182 throw new RuntimeException("Could not parse templates!", uee1);
184 Closer.close(templateReader);
185 Closer.close(templateInputStream);