/**************************************************************************
/* This class loads a script and executes various functions.
/*
/* Copyright (c) 2007 by Bernhard Bablok (mail@bablokb.de)
/*
/* 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; see the file COPYING.  If not, write to
/* the Free Software Foundation Inc., 59 Temple Place - Suite 330,
/* Boston, MA  02111-1307 USA
/**************************************************************************/

import java.io.*;
import javax.script.*;

/**
   This class loads a script and executes various functions.

   @version $Revision: 1.3 $
   @author  $Author: bablokb $
*/

public class ExecFuncs {

  private static final String SCRIPT_NAME1 = "execfuncs.py",
                              SCRIPT_NAME2 = "execfuncs2.py";

  private ScriptEngine iEngine = null;

  //////////////////////////////////////////////////////////////////////////////

  /**
     Constructor.
  */

  public ExecFuncs() throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    iEngine = manager.getEngineByName("jython");
    if (iEngine == null) {
      throw new IllegalStateException("no jython script-engine");
    }
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Return engine
  */

  public ScriptEngine getEngine() {
    return iEngine;
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Read and evaluate script.

     @param pName script name
  */

  public void readScript(String pName) throws Exception {
    FileReader reader = new FileReader(pName);
    iEngine.eval(reader);
    reader.close();
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Execute function.

     @param pName function name
     @param pArgs function arguments

  */

  public void execFunc(String pName,Object... pArgs) throws Exception {
    ((Invocable) iEngine).invokeFunction(pName,pArgs);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Main method.

     @param args Program arguments (ignored).
  */

  public static void main(String[] args) {
    try {
      ExecFuncs obj = new ExecFuncs();
      obj.readScript(SCRIPT_NAME1);
      obj.execFunc("printX");
      obj.execFunc("setX","5");
      obj.execFunc("printX");

      obj.readScript(SCRIPT_NAME2);
      obj.execFunc("setX",Math.PI);
      obj.execFunc("printX");

      obj.execFunc("printY");
      obj.execFunc("setY","42");
      obj.execFunc("printY");
    } catch (Exception e) {
      e.printStackTrace();
    } 
  }
}