From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Wed, 18 Apr 2012 21:47:21 +0000 (+0200)
Subject: Add servlet that forwards all requests to pages and templates.
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=6cbe089ff6c0ea477e8c8a2f4fe1d20c51f72e69;p=demoscenemusic.git

Add servlet that forwards all requests to pages and templates.
---

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/core/TemplateServlet.java b/src/main/java/net/pterodactylus/demoscenemusic/core/TemplateServlet.java
new file mode 100644
index 0000000..a2ec825
--- /dev/null
+++ b/src/main/java/net/pterodactylus/demoscenemusic/core/TemplateServlet.java
@@ -0,0 +1,153 @@
+/*
+ * DemosceneMusic - TemplateServlet.java - Copyright © 2012 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.demoscenemusic.core;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.UnsupportedEncodingException;
+import java.lang.reflect.InvocationTargetException;
+import java.net.URISyntaxException;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import net.pterodactylus.demoscenemusic.page.ServletRequest;
+import net.pterodactylus.util.io.Closer;
+import net.pterodactylus.util.template.Template;
+import net.pterodactylus.util.template.TemplateContextFactory;
+import net.pterodactylus.util.template.TemplateParser;
+import net.pterodactylus.util.web.Header;
+import net.pterodactylus.util.web.Page;
+import net.pterodactylus.util.web.Response;
+
+/**
+ * TODO
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class TemplateServlet extends HttpServlet {
+
+	private Core core;
+	private final TemplateContextFactory templateContextFactory = new TemplateContextFactory();
+
+	private final Map<String, Page<ServletRequest>> pages = new HashMap<String, Page<ServletRequest>>();
+
+	//
+	// SERVLET METHODS
+	//
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public void init(ServletConfig config) throws ServletException {
+		super.init(config);
+		core = (Core) config.getServletContext().getAttribute("core");
+
+		templateContextFactory.addTemplateObject("core", core);
+		templateContextFactory.addTemplateObject("dataManager", core.getDataManager());
+
+		for (@SuppressWarnings("rawtypes")
+		Enumeration parameterNames = config.getInitParameterNames(); parameterNames.hasMoreElements();) {
+			String pageName = (String) parameterNames.nextElement();
+			Template template = getTemplate(pageName);
+			String pageClassName = config.getInitParameter(pageName);
+			try {
+				Class<?> pageClass = Class.forName(pageClassName);
+				@SuppressWarnings("unchecked")
+				Page<ServletRequest> page = (Page<ServletRequest>) pageClass.getConstructor(Core.class, TemplateContextFactory.class, Template.class).newInstance(core, templateContextFactory, template);
+				pages.put(pageName, page);
+			} catch (ClassNotFoundException cnfe1) {
+				cnfe1.printStackTrace();
+			} catch (IllegalArgumentException iae1) {
+				iae1.printStackTrace();
+			} catch (SecurityException se1) {
+				se1.printStackTrace();
+			} catch (InstantiationException ie1) {
+				ie1.printStackTrace();
+			} catch (IllegalAccessException iae1) {
+				iae1.printStackTrace();
+			} catch (InvocationTargetException ite1) {
+				ite1.printStackTrace();
+			} catch (NoSuchMethodException nsme1) {
+				nsme1.printStackTrace();
+			}
+		}
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	protected void doGet(HttpServletRequest request, HttpServletResponse httpServletResponse) throws ServletException, IOException {
+		String path = request.getPathInfo();
+		if (path.startsWith("/")) {
+			path = path.substring(1);
+		}
+		Page<ServletRequest> page = pages.get(path);
+		if (page != null) {
+			ServletRequest servletRequest;
+			try {
+				servletRequest = new ServletRequest(request);
+			} catch (URISyntaxException use1) {
+				throw new IOException("Could not create URI from " + request.getRequestURI(), use1);
+			}
+			Response response = new Response(httpServletResponse.getOutputStream());
+			response = page.handleRequest(servletRequest, response);
+			for (Header header : response.getHeaders()) {
+				for (String value : header) {
+					httpServletResponse.addHeader(header.getName(), value);
+				}
+			}
+			httpServletResponse.setContentType(response.getContentType());
+			httpServletResponse.setStatus(response.getStatusCode());
+			return;
+		}
+	}
+
+	//
+	// PRIVATE METHODS
+	//
+
+	private Template getTemplate(String pageName) {
+		InputStream templateInputStream = getClass().getResourceAsStream("/templates/" + pageName);
+		if (templateInputStream == null) {
+			return null;
+		}
+		Reader templateReader = null;
+		try {
+			templateReader = new InputStreamReader(templateInputStream, "UTF-8");
+			return TemplateParser.parse(templateReader);
+		} catch (UnsupportedEncodingException uee1) {
+			/* can not happen. */
+			throw new RuntimeException("Could not parse templates!", uee1);
+		} finally {
+			Closer.close(templateReader);
+			Closer.close(templateInputStream);
+		}
+	}
+
+}