source: branches/streams/abcl/examples/lisp-to-java/Main.java

/*
 * Main.java
 *
 * Copyright (C) 2008 Ville Voutilainen
 * $Id: Main.java 12307 2009-12-25 21:54:31Z ehuelsmann $
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

import org.armedbear.lisp.*;

public class Main
{
    /**
     * This example creates an Interpreter instance, loads our
     * lisp code from a file and then looks up a function defined
     * in the loaded lisp file and executes the function. 
     *
     * The function takes a single parameter and invokes a java method
     * on the object provided. We provide our Main object as the parameter.
     *
     */
    public static void main(String[] argv)
    {
  try
      {
    Main thisObject = new Main();
    Interpreter interpreter = Interpreter.createInstance();
    interpreter.eval("(load \"lispfunctions.lisp\")");
    // the function is not in a separate package, thus the
    // correct package is CL-USER. Symbol names are
    // upper case. Package needs the prefix, because java
    // also has a class named Package.
    org.armedbear.lisp.Package defaultPackage = 
        Packages.findPackage("CL-USER");
    Symbol voidsym = 
        defaultPackage.findAccessibleSymbol("VOID-FUNCTION");
    Function voidFunction = (Function) voidsym.getSymbolFunction();
    voidFunction.execute(new JavaObject(thisObject));
      }
  catch (Throwable t)
      {
    System.out.println("exception!");
    t.printStackTrace();
      }
    }
    public int addTwoNumbers(int a, int b)
    {
  return a + b;
    }
}