/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.commons.net.examples;
  
  import java.io.InputStream;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.security.CodeSource;
  import java.util.Collections;
  import java.util.List;
  import java.util.Properties;
  
  /**
   * Helper application for example classes.
   */
  public class Main {
  
      private static boolean fromJar() {
          final CodeSource codeSource = Main.class.getProtectionDomain().getCodeSource();
          if (codeSource != null) {
              return codeSource.getLocation().getFile().endsWith(".jar");
          }
          return false; // No idea if this can happen
      }
  
      /**
       * Helper application for example classes. Lists available classes, and provides shorthand invocation. For example:<br>
       * <code>java -jar commons-net-examples-m.n.jar FTPClientExample -l host user password</code>
       *
       * @param args the first argument is used to name the class; remaining arguments are passed to the target class.
       * @throws Throwable if an error occurs
       */
      public static void main(final String[] args) throws Throwable {
          final Properties fp = new Properties();
          final InputStream ras = Main.class.getResourceAsStream("examples.properties");
          if (ras != null) {
              fp.load(ras);
          } else {
              System.err.println("[Cannot find examples.properties file, so aliases cannot be used]");
          }
          if (args.length == 0) {
              if (Thread.currentThread().getStackTrace().length > 2) { // called by Maven
                  System.out.println(
                          "Usage: mvn -q exec:java  -Dexec.arguments=<alias or" + " exampleClass>,<exampleClass parameters> (comma-separated, no spaces)");
                  System.out.println("Or   : mvn -q exec:java  -Dexec.args=\"<alias" + " or exampleClass> <exampleClass parameters>\" (space separated)");
              } else if (fromJar()) {
                  System.out.println("Usage: java -jar commons-net-examples-m.n.jar <alias or exampleClass> <exampleClass parameters>");
              } else {
                  System.out
                          .println("Usage: java -cp target/classes org.apache.commons.net.examples.Main" + " <alias or exampleClass> <exampleClass parameters>");
              }
              @SuppressWarnings("unchecked") // property names are Strings
              final List<String> l = (List<String>) Collections.list(fp.propertyNames());
              if (l.isEmpty()) {
                  return;
              }
              l.sort(null);
              System.out.println("\nAliases and their classes:");
              for (final String s : l) {
                  System.out.printf("%-25s %s%n", s, fp.getProperty(s));
              }
              return;
          }
  
          final String shortName = args[0];
          String fullName = fp.getProperty(shortName);
          if (fullName == null) {
              fullName = shortName;
          }
          try {
              final Class<?> clazz = Class.forName(fullName);
              final Method m = clazz.getDeclaredMethod("main", args.getClass());
              final String[] args2 = new String[args.length - 1];
              System.arraycopy(args, 1, args2, 0, args2.length);
              try {
                  m.invoke(null, (Object) args2);
              } catch (final InvocationTargetException ite) {
                  final Throwable cause = ite.getCause();
                  if (cause != null) {
                      throw cause;
                  }
                  throw ite;
              }
          } catch (final ClassNotFoundException e) {
             System.out.println(e);
         }
     }
 }