content: package org.libtorrent4j.demo;
  
  import org.libtorrent4j.alerts.Alerts;
  import org.libtorrent4j.alerts.TorrentAlert;
  import org.libtorrent4j.swig.libtorrent;
  
  import java.io.File;
  import java.lang.reflect.Field;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.List;
  
  /**
   * @author gubatron
   * @author aldenml
   */
  public final class AlertsSwitch {
  
      public static void main(String[] args) throws Exception {
          printForAlerts();
          System.out.println("=============================");
          printForTorrentAlertsAdapter();
          System.out.println("=============================");
          printForAlertType();
      }
  
      private static void printForAlerts() throws Exception {
          Class[] arr = getSwigAlerts();
  
          for (int i = 0; i < arr.length; i++) {
              String s = "arr[" + i + "] = new CastLambda() { @Override public Alert cast(alert a) { return new ";
              if (arr[i] != null) {
                  String c = capitalizeAlertTypeName(arr[i].getSimpleName());
                  s += c + "(cast_to_" + arr[i].getSimpleName() + "(a));";
              } else {
                  s += "GenericAlert(a);";
              }
  
              s += "}};";
  
              System.out.println(s);
          }
      }
  
      private static void printForTorrentAlertsAdapter() throws Exception {
          Class[] arr = getSwigAlerts();
  
          for (int i = 0; i < arr.length; i++) {
              String s = "arr[" + i + "] = new InvokeLambda() { @Override public void invoke(TorrentAlertAdapter l, Alert a) { ";
              if (arr[i] != null) {
                  String c = capitalizeAlertTypeName(arr[i].getSimpleName());
                  Class<?> alertClass = Class.forName("org.libtorrent4j.alerts." + c);
                  if (TorrentAlert.class.isAssignableFrom(alertClass)) {
                      String cc = Character.toLowerCase(c.charAt(0)) + c.substring(1);
                      cc = cc.replace("Alert", "");
                      s += "l." + cc + "((" + c + ")a);";
                      s += "}};";
                  } else {
                      s = "arr[" + i + "] = null;";
                  }
              } else {
                  s = "arr[" + i + "] = null;";
              }
  
              System.out.println(s);
          }
      }
  
      private static void printForAlertType() throws Exception {
          Class[] arr = getSwigAlerts();
  
          for (int i = 0; i < arr.length; i++) {
              String s = "arr[" + i + "] = ";
              if (arr[i] != null) {
                  String c = arr[i].getSimpleName().toUpperCase();
                  c = c.replace("_ALERT", "");
                  s += c + ";";
              } else {
                  s += "UNKNOWN;";
              }
  
              System.out.println(s);
          }
      }
  
      private static Class[] getSwigAlerts() throws Exception {
          int n = 0;
          Class[] arr = new Class[Alerts.NUM_ALERT_TYPES];
          for (Class c : getClasses("org.libtorrent4j.swig")) {
              if (c.getName().endsWith("_alert")) {
                  Field f = c.getDeclaredField("alert_type");
                  int type = f.getInt(null);
  
                  arr[type] = c;
                  n++;
              }
          }
  
          return arr;
      }
  
      private static Class[] getClasses(String packageName) throws Exception {
          ClassLoader cl = Thread.currentThread().getContextClassLoader();
          String path = packageName.replace('.', '/');
          Enumeration<URL> resources = cl.getResources(path);
          List<File> dirs = new ArrayList<>();
          while (resources.hasMoreElements()) {
              URL resource = resources.nextElement();
              dirs.add(new File(resource.getFile()));
          }
          ArrayList<Class> classes = new ArrayList<>();
          for (File directory : dirs) {
              classes.addAll(findClasses(directory, packageName));
          }
          return classes.toArray(new Class[classes.size()]);
      }
  
      private static List<Class> findClasses(File directory, String packageName) throws Exception {
          List<Class> classes = new ArrayList<>();
          if (!directory.exists()) {
              return classes;
          }
          File[] files = directory.listFiles();
          for (File file : files) {
              if (file.isDirectory()) {
                  classes.addAll(findClasses(file, packageName + "." + file.getName()));
              } else if (file.getName().endsWith(".class")) {
                  classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
              }
          }
          return classes;
      }
  
      private static String capitalizeAlertTypeName(String s) {
          StringBuilder sb = new StringBuilder(s.length());
  
          boolean capitalize = true;
          for (int i = 0; i < s.length(); i++) {
              char ch = s.charAt(i);
              if (capitalize) {
                  sb.append(Character.toUpperCase(ch));
                  capitalize = false;
              } else if (ch == '_') {
                  capitalize = true;
              } else {
                  sb.append(ch);
              }
          }
  
          return sb.toString();
      }
  }
  