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iText ISO-19005 Module
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/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2017 iText Group NV
 * Authors: Bruno Lowagie, et al.
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package com.itextpdf.text.zugferd.checkers.basic;

import com.itextpdf.text.zugferd.checkers.CodeValidation;

/**
 * Class that can be used to check if a language code is well-formed.
 * IMPORTANT: this doesn't check if the code is valid in the sense that
 * it doesn't check the code against a list of languages.
 */
public class LanguageCode extends CodeValidation {
    /**
     * The code list provided with the ZUGFeRD standard only lists four codes:
     * de, fr, en, and es. Obviously, there are more codes available (in ISO 639-1).
     * We won't check the presence of a code in ISO 639-1, but we'll check if the
     * code consists of two letters and if it's lowercase.
     * @param code the code to be tested
     * @return true if the code has the correct format
     */
    public boolean isValid(String code) {
        return isLowercase(code, 2);
    }
}