Package org.jfree.formula.demo

Source Code of org.jfree.formula.demo.DemoApplication

/**
* =========================================
* LibFormula : a free Java formula library
* =========================================
*
* Project Info:  http://reporting.pentaho.org/libformula/
*
* (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
*
* ------------
* $Id: DemoApplication.java 2716 2007-04-01 13:51:58Z taqua $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/

package org.jfree.formula.demo;

import javax.swing.JOptionPane;

import org.jfree.formula.EvaluationException;
import org.jfree.formula.Formula;
import org.jfree.formula.LibFormulaBoot;
import org.jfree.formula.parser.ParseException;

/**
* Creation-Date: Feb 21, 2007, 2:55:48 PM
*
* @author Thomas Morgner
*/
public class DemoApplication
{
  private DemoApplication()
  {
  }

  public static void main(final String[] args)
      throws ParseException, EvaluationException
  {
    LibFormulaBoot.getInstance().start();

    final String formula = JOptionPane.showInputDialog
        ("Please enter a formula.");

    if (formula == null)
    {
      return;
    }

    // first parse the formula. This checks the general syntax, but does not
    // check whether the used functions or references are actually valid.
    final Formula f = new Formula(formula);

    // connects the parsed formula to the context. The context provides the
    // operator and function implementations and resolves the references.
    f.initialize(new DemoFormulaContext());

    JOptionPane.showMessageDialog(null, "The result is " + f.evaluate(),
        "Result", JOptionPane.INFORMATION_MESSAGE);

    System.exit(0);
  }
}
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