added modules, classloading and view packages to sonia.scm.lifecycle

scm-webapp/src/main/java/sonia/scm/lifecycle/view/SingleViewServlet.java

@@ -0,0 +1,63 @@
+package sonia.scm.lifecycle.view;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import sonia.scm.template.Template;
+import sonia.scm.template.TemplateEngine;
+import sonia.scm.template.TemplateEngineFactory;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+@Singleton
+public class SingleViewServlet extends HttpServlet {
+
+  private static final Logger LOG = LoggerFactory.getLogger(SingleViewServlet.class);
+
+  private final Template template;
+  private final ViewController controller;
+
+  @Inject
+  public SingleViewServlet(TemplateEngineFactory templateEngineFactory, ViewController controller) {
+    template = createTemplate(templateEngineFactory, controller.getTemplate());
+    this.controller = controller;
+  }
+
+  private Template createTemplate(TemplateEngineFactory templateEngineFactory, String template) {
+    TemplateEngine engine = templateEngineFactory.getEngineByExtension(template);
+    try {
+      return engine.getTemplate(template);
+    } catch (IOException e) {
+      throw new IllegalStateException("failed to parse template: " + template, e);
+    }
+  }
+
+  @Override
+  protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
+    process(req, resp);
+  }
+
+  @Override
+  protected void doPost(HttpServletRequest req, HttpServletResponse resp) {
+    process(req, resp);
+  }
+
+  private void process(HttpServletRequest request, HttpServletResponse response) {
+    View view = controller.createView(request);
+
+    response.setStatus(view.getStatusCode());
+    response.setContentType("text/html");
+    response.setCharacterEncoding("UTF-8");
+
+    try (PrintWriter writer = response.getWriter()) {
+      template.execute(writer, view.getModel());
+    } catch (IOException ex) {
+      LOG.error("failed to write view", ex);
+    }
+  }
+}