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Provides Java MRZ parser
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/**
 * Java parser for the MRZ records, as specified by the ICAO organization.
 * Copyright (C) 2011 Innovatrics s.r.o.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.innovatrics.mrz;

import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;

/**
 * Demo Swing application, demonstrates simple MRZ parsing.
 *
 * @author Martin Vysny
 */
@SuppressWarnings("HideUtilityClassConstructor")
public class Demo {

	private static int toPos(final int col, final int row, final String text) {
		int currentRow = 0;
		int currentCol = 0;
		int pos = 0;
		while (text.length() > pos) {
			if (row == currentRow && currentCol == col) {
				return pos;
			}
			if (text.charAt(pos) == '\n') {
				currentRow++;
				currentCol = 0;
			} else {
				currentCol++;
			}
			pos++;
		}
		return -1;
	}

	/**
	 * MRZ demo.
	 *
	 * @param args the main arguments
	 */
	public static void main(final String[] args) {
		final JFrame frame = new JFrame("MRZDemo");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		final JTextArea mrz = new JTextArea(5, 44);
		final JButton parse = new JButton("Parse");
		parse.addActionListener(event -> {
			final String m = mrz.getText();
			try {
				final MrzRecord record = MrzParser.parse(m);
				JOptionPane.showMessageDialog(frame, "Parse successfull: " + record);
			} catch (MrzParseException ex) {
				JOptionPane.showMessageDialog(frame, "Parse failed: " + ex);
				final MrzRange r = ex.getRange();
				mrz.select(toPos(r.getColumn(), r.getRow(), m), toPos(r.getColumnTo(), r.getRow(), m));
			} catch (Exception ex) {
				JOptionPane.showMessageDialog(frame, "Parse failed: " + ex);
			}
		});
		frame.getContentPane().add(mrz, BorderLayout.CENTER);
		frame.getContentPane().add(parse, BorderLayout.SOUTH);
		frame.pack();
		frame.setVisible(true);
	}
}