source: branches/streams/abcl/examples/java-interface/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 loads a lisp file and gets two function symbols
     * from it. The functions return implementations of MyInterface.
     * The example gets two separate implementations and invokes
     * the functions in the interface for both implementations.
     */
    public static void main(String[] argv)
    {
  try
      {
    Interpreter interpreter = Interpreter.createInstance();
    interpreter.eval("(load \"interface_implementation.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 interfacesym = 
        defaultPackage.findAccessibleSymbol("GET-INTERFACE");
    Function interfaceFunction = 
        (Function) interfacesym.getSymbolFunction();
    LispObject myinterface = interfaceFunction.execute();
    MyInterface x = 
        (MyInterface) JavaObject.getObject(myinterface);
    x.firstFunction();
    x.secondFunction();
    Symbol interfacesym2 = 
        defaultPackage.
        findAccessibleSymbol("GET-ANOTHER-INTERFACE");
    Function interfaceFunction2 = 
        (Function) interfacesym2.getSymbolFunction();
    LispObject myInterface2 = interfaceFunction2.execute();
    MyInterface y = 
        (MyInterface) JavaObject.getObject(myInterface2);
    y.firstFunction();
    y.secondFunction();
      }
  catch (Throwable t)
      {
    System.out.println("exception!");
    t.printStackTrace();
      }
    }
}