org.argeo.slc.detached/src/main/java/org/argeo/slc/detached/AppLauncher.java

   1 package org.argeo.slc.detached;
   2
   3 import java.lang.reflect.Method;
   4 import java.util.ArrayList;
   5 import java.util.List;
   6 import java.util.Properties;
   7
   8 public class AppLauncher {
   9         private Properties systemProperties = new Properties();
  10         private String mainClass = null;
  11         private List arguments = new ArrayList();
  12
  13         public void launch() {
  14
  15                 Properties base = System.getProperties();
  16                 Properties fake = new Properties(base);
  17
  18                 try {
  19                         if (mainClass == null)
  20                                 throw new DetachedException(
  21                                                 "A main class name has to be specified.");
  22
  23                         System.getProperties().putAll(systemProperties);
  24
  25                         ClassLoader cl = Thread.currentThread().getContextClassLoader();
  26                         Class clss = cl.loadClass(mainClass);
  27
  28                         String[] args = new String[arguments.size()];
  29                         for (int i = 0; i < arguments.size(); i++) {
  30                                 args[i] = arguments.get(i).toString();
  31                         }
  32
  33                         Class[] mainArgsClasses = new Class[] { args.getClass() };
  34                         Object[] mainArgs = { args };
  35                         Method mainMethod = clss.getMethod("main", mainArgsClasses);
  36
  37                         System.setProperties(fake);
  38
  39                         mainMethod.invoke(null, mainArgs);
  40
  41                 } catch (Exception e) {
  42                         throw new DetachedException("Unexpected exception while launching "
  43                                         + mainClass, e);
  44                 } finally {
  45                         System.setProperties(base);
  46                 }
  47
  48         }
  49
  50         public void setSystemProperties(Properties systemProperties) {
  51                 this.systemProperties = systemProperties;
  52         }
  53
  54         public void setMainClass(String mainClass) {
  55                 this.mainClass = mainClass;
  56         }
  57
  58         public void setArguments(List arguments) {
  59                 this.arguments = arguments;
  60         }
  61
  62 }