rtl/java/Launcher.java

   1 import java.lang.reflect.*;
   2
   3 class Launcher
   4 {
   5         public static void main(String[] args)
   6                 throws Throwable
   7         {
   8                 /* Этап 1: Сохраняем список параметров */
   9                 Args.args = args;
  10
  11                 /* Этап 2: Получаем имена связки Модуль.Команда */
  12                 if(args == null || args.length < 1)
  13                 {
  14                         System.err.println("uses: Launcher Module[.Command] {Argumets}");
  15                         System.exit(1);
  16                 }
  17
  18                 String moduleName = args[0];
  19                 String commandName = "";
  20                 int i = args[0].indexOf('.');
  21                 if(i >= 0)
  22                 {
  23                         moduleName = args[0].substring(0, i);
  24                         commandName = args[0].substring(i + 1);
  25                         if(commandName == "BEGIN")
  26                         {
  27                                 commandName = "";
  28                         }
  29                 }
  30
  31                 /* Этап 3: Выполнение тела модуля и команды */
  32                 Class<?> module = null;
  33                 Method begin = null;
  34                 Method command = null;
  35
  36                 try {
  37                         module = Class.forName(moduleName);
  38                 } catch(ClassNotFoundException e) {
  39                         System.err.println("Module " + moduleName + " not found");
  40                         System.exit(1);
  41                 }
  42
  43                 try {
  44                         begin = module.getMethod("BEGIN");
  45                 } catch(Exception e) {
  46                         System.err.println("Invalid module " + moduleName);
  47                         System.exit(1);
  48                 }
  49
  50                 try {
  51                         begin.invoke(null);
  52                 } catch(IllegalAccessException e) {
  53                         System.err.println("Invalid module " + moduleName);
  54                         System.exit(1);
  55                 } catch(IllegalArgumentException e) {
  56                         System.err.println("Invalid module " + moduleName);
  57                         System.exit(1);
  58                 } catch(InvocationTargetException e) {
  59                         throw e.getTargetException();
  60                 }
  61
  62                 if(commandName == "")
  63                 {
  64                         return;
  65                 }
  66
  67                 try {
  68                         command = module.getMethod(commandName);
  69                 } catch(Exception e) {
  70                         System.err.println("Invalid command " + moduleName + "." + commandName);
  71                         System.exit(1);
  72                 }
  73
  74                 try {
  75                         command.invoke(null);
  76                 } catch(IllegalAccessException e) {
  77                         System.err.println("Invalid command " + moduleName + "." + commandName);
  78                         System.exit(1);
  79                 } catch(IllegalArgumentException e) {
  80                         System.err.println("Invalid command " + moduleName + "." + commandName);
  81                         System.exit(1);
  82                 } catch(InvocationTargetException e) {
  83                         throw e.getTargetException();
  84                 }
  85         }
  86 }