/**
 * Distribution License:
 * BibleDesktop is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License, version 2 or later
 * as published by the Free Software Foundation. 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.
 *
 * The License is available on the internet at:
 *       http://www.gnu.org/copyleft/gpl.html
 * or by writing to:
 *      Free Software Foundation, Inc.
 *      59 Temple Place - Suite 330
 *      Boston, MA 02111-1307, USA
 *
 * © CrossWire Bible Society, 2005 - 2016
 */
package org.crosswire.common.swing;

import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

/**
 * A numeric document simply extends document to refuse all non-numeric data
 * entered according to Character.isDigit.
 * 
 * @see gnu.gpl.License The GNU General Public License for details.
 * @author Joe Walker
 * @see java.lang.Character#isDigit(char)
 */
public class NumericDocument extends PlainDocument {
    /* (non-Javadoc)
     * @see javax.swing.text.PlainDocument#insertString(int, java.lang.String, javax.swing.text.AttributeSet)
     */
    @Override
    public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
        if (str == null) {
            return;
        }

        char[] upper = str.toCharArray();
        StringBuilder clear = new StringBuilder();

        for (int i = 0; i < upper.length; i++) {
            if (Character.isDigit(upper[i])) {
                clear.append(upper[i]);
            }
        }

        super.insertString(offs, clear.toString(), a);
    }

    /**
     * Serialization ID
     */
    private static final long serialVersionUID = 3761973765420102192L;
}