JarMain.java

package com.sleepycat.je.utilint;
import java.lang.reflect.Method;
import de.ovgu.cide.jakutil.*;
/** 
 * Used as the main class for the manifest of the je.jar file, and so it is
 * executed when running: java -jar je.jar.  The first argument must be the
 * final part of the class name of a utility in the com.sleepycat.je.util
 * package, e.g., DbDump.  All following parameters are passed to the main
 * method of the utility and are processed as usual.
 * Apart from the package, this class is ambivalent about the name of the
 * utility specified; the only requirement is that it must be a public static
 * class and must contain a public static main method.
 */
public class JarMain {
  private static final String USAGE="usage: java <utility> [options...]";
  private static final String PREFIX="com.sleepycat.je.util.";
  public static void main(  String[] args){
    try {
      if (args.length < 1) {
        usage("Missing utility name");
      }
      Class cls=Class.forName(PREFIX + args[0]);
      Method mainMethod=cls.getMethod("main",new Class[]{String[].class});
      String[] mainArgs=new String[args.length - 1];
      System.arraycopy(args,1,mainArgs,0,mainArgs.length);
      mainMethod.invoke(null,new Object[]{mainArgs});
    }
 catch (    Throwable e) {
      usage(e.toString());
    }
  }
  private static void usage(  String msg){
    System.err.println(msg);
    System.err.println(USAGE);
    System.exit(-1);
  }
}