/*
 * (c) Copyright 2008-2010 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.databene.domain.address;

import javax.validation.ConstraintValidatorContext;

import org.databene.commons.validator.bean.AbstractConstraintValidator;

/**
 * Validates ISO-3166-1 alpha-2 country codes.<br/>
 * <br/>
 * Created at 12.07.2008 15:24:58
 * @since 0.5.4
 * @author Volker Bergmann
 * @see "http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2"
 */
public class CountryCode2Validator extends AbstractConstraintValidator<CountryCode2, String> {

	public boolean isValid(String countryCode, ConstraintValidatorContext context) {
	    if (countryCode == null || countryCode.length() != 2)
			return false;
		if (!Character.isLetter(countryCode.charAt(0))
				|| !Character.isLetter(countryCode.charAt(1)))
			return false;
		return (Country.getInstance(countryCode) != null);
	}

}