InputFilterUtility.java

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package com.opentrafficsimulation.gui.utility;

import java.awt.Toolkit;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;

/**
 *
 * @author macromania
 */
public class InputFilterUtility extends DocumentFilter {

    @Override
    public void insertString(DocumentFilter.FilterBypass fb, int offset,
            String string, AttributeSet attr)
            throws BadLocationException {
        try {
            if (string.equals(".")
                    && !fb.getDocument()
                    .getText(0, fb.getDocument().getLength())
                    .contains(".")) {
                super.insertString(fb, offset, string, attr);
                return;
            }
            Double.parseDouble(string);
            super.insertString(fb, offset, string, attr);
        } catch (Exception e) {
            Toolkit.getDefaultToolkit().beep();
        }

    }

    @Override
    public void replace(DocumentFilter.FilterBypass fb, int offset, int length,
            String text, AttributeSet attrs)
            throws BadLocationException {
        try {
            if (text.equals(".")
                    && !fb.getDocument()
                    .getText(0, fb.getDocument().getLength())
                    .contains(".")) {
                super.insertString(fb, offset, text, attrs);
                return;
            }
            Double.parseDouble(text);
            super.replace(fb, offset, length, text, attrs);
        } catch (Exception e) {
            Toolkit.getDefaultToolkit().beep();
        }
    }
}