/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.formula.demo;
import javax.swing.JOptionPane;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.Formula;
import org.pentaho.reporting.libraries.formula.LibFormulaBoot;
import org.pentaho.reporting.libraries.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());
final Object o = f.evaluate();
JOptionPane.showMessageDialog(null, "The result is " + o,
"Result", JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
}