_finally.java :  » Scripting » Pnuts » org » pnuts » lib » Java Open Source

/*
 * @(#)_finally.java 1.2 04/12/06
 *
 * Copyright (c) 1997-2004 Sun Microsystems, Inc. All Rights Reserved.
 *
 * See the file "LICENSE.txt" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */
package org.pnuts.lib;

import pnuts.lang.*;

/*
 * function finally( { func1,} func2)
 */
public class _finally extends PnutsFunction {

  private final static Object[] noarg = new Object[0];

  public _finally(){
    super("finally");
  }

  public boolean defined(int nargs){
    return nargs == 1 || nargs == 2;
  }

  protected Object exec(final Object args[], Context context){
    int nargs = args.length;
    if (nargs == 1){
      context.setExitHook(new Executable(){
          public Object run(Context ctx){
            return ((PnutsFunction)args[0]).call(noarg, ctx);
          }
        });
      return null;
    } else if (nargs == 2){
      PnutsFunction f1 = (PnutsFunction)args[0];
      PnutsFunction f2 = (PnutsFunction)args[1];
      try {
        return f1.call(noarg, context);
      } finally {
        f2.call(noarg, context);
      }
    } else {
      undefined(args, context);
      return null;
    }
  }

  public String toString(){
    return "function finally( { tryFunc(), } finallyFunc())";
  }
}