// $Header: /home/cvs/jakarta-jmeter/src/core/org/apache/jmeter/gui/util/NumberFieldErrorListener.java,v 1.4 2004/02/13 02:40:53 sebb Exp $
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
*/

package org.apache.jmeter.gui.util;

import java.awt.Component;
import java.awt.TextComponent;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;

import javax.swing.JOptionPane;
import javax.swing.text.JTextComponent;

import org.apache.jmeter.util.JMeterUtils;

/**
 * @author mstover
 * @version $Revision: 1.4 $
 */
public class NumberFieldErrorListener extends FocusAdapter
{

    private static NumberFieldErrorListener listener =
        new NumberFieldErrorListener();

    public static NumberFieldErrorListener getNumberFieldErrorListener()
    {
        return listener;
    }

    public void focusLost(FocusEvent e)
    {
        Component source = (Component) e.getSource();
        String text = "";
        if (source instanceof JTextComponent)
        {
            text = ((JTextComponent) source).getText();
        }
        else if (source instanceof TextComponent)
        {
            text = ((TextComponent) source).getText();
        }
        try
        {
            Integer.parseInt(text);
        }
        catch (NumberFormatException nfe)
        {
            JOptionPane.showMessageDialog(
                source,
                JMeterUtils.getResString("You must enter a valid number"),
                JMeterUtils.getResString("Invalid data"),
                JOptionPane.WARNING_MESSAGE);
            new FocusRequester(source);
        }
    }
}