rtl/java/Launcher.java

   1 import java.lang.reflect.*;
   2
   3 class Launcher
   4 {
   5         public static void main(String[] args)
   6         {
   7                 /* Этап 1: Сохраняем список параметров */
   8                 Args.args = args;
   9
  10                 /* Этап 2: Получаем имена связки Модуль.Команда */
  11                 if(args == null || args.length < 1)
  12                 {
  13                         System.err.println("uses: Launcher Module[.Command] {Argumets}");
  14                         System.exit(1);
  15                 }
  16
  17                 String moduleName = args[0];
  18                 String commandName = "";
  19                 int i = args[0].indexOf('.');
  20                 if(i >= 0)
  21                 {
  22                         moduleName = args[0].substring(0, i);
  23                         commandName = args[0].substring(i + 1);
  24                         if(commandName == "BEGIN")
  25                         {
  26                                 commandName = "";
  27                         }
  28                 }
  29
  30                 /* Этап 3: Выполнение тела модуля и команды */
  31                 Class<?> module = null;
  32                 Method begin = null;
  33                 Method command = null;
  34
  35                 try {
  36                         module = Class.forName(moduleName);
  37                 } catch(ClassNotFoundException e) {
  38                         System.err.println("Module " + moduleName + " not found");
  39                         System.exit(1);
  40                 }
  41
  42                 try {
  43                         begin = module.getMethod("BEGIN");
  44                 } catch(Exception e) {
  45                         System.err.println("Invalid module " + moduleName);
  46                         System.exit(1);
  47                 }
  48
  49                 try {
  50                         begin.invoke(null);
  51                 } catch(IllegalAccessException e) {
  52                         System.err.println("Invalid module " + moduleName);
  53                         System.exit(1);
  54                 } catch(IllegalArgumentException e) {
  55                         System.err.println("Invalid module " + moduleName);
  56                         System.exit(1);
  57                 } catch(InvocationTargetException e) {
  58                         System.err.println("Invalid module " + moduleName);
  59                         System.exit(1);
  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                         System.err.println("Invalid command " + moduleName + "." + commandName);
  84                         System.exit(1);
  85                 }
  86         }
  87 }