/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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 */

import java.text.DecimalFormatSymbols;

import java.util.Calendar;

import java.util.GregorianCalendar;

import java.util.Locale;

import java.util.Locale.Builder;

/**

 * TestUtils provides utility methods to get a locale-dependent attribute.

 * For example,

 *   - whether or not a non-Gregorian calendar is used

 *   - whether or not non-ASCII digits are used

 *

 * This class was developed to help testing for internationalization &

 * localization and is not versatile.

 */

public class TestUtils {

    /**

     * Returns true if the give locale uses Gregorian calendar.

     */

    public static boolean usesGregorianCalendar(Locale locale) {

        return Calendar.getInstance(locale).getClass() == GregorianCalendar.class;

    }

    /**

     * Returns true if the given locale uses ASCII digits.

     */

    public static boolean usesAsciiDigits(Locale locale) {

        return DecimalFormatSymbols.getInstance(locale).getZeroDigit() == '0';

    }

    /**

     * Returns true if the given locale has a special variant which is treated

     * as ill-formed in BCP 47.

     *

     * BCP 47 requires a variant subtag to be 5 to 8 alphanumerics or a

     * single numeric followed by 3 alphanumerics.

     * However, note that this methods doesn't check a variant so rigorously

     * because this is a utility method for testing. Intended special variants

     * are: JP, NY, and TH, which can be commonly provided by

     * Locale.getAvailableLocales().

     *

     */

    public static boolean hasSpecialVariant(Locale locale) {

        String variant = locale.getVariant();

        return !variant.isEmpty()

                   && "JP".equals(variant) || "NY".equals(variant) || "TH".equals(variant);

    }

}