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

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 * 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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,

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 *

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package java.util.spi;

import java.util.Locale;

import java.util.Objects;

/**

 * An abstract class for service providers that

 * provide localized names for the

 * {@link java.util.Locale Locale} class.

 *

 * @since        1.6

 */

public abstract class LocaleNameProvider extends LocaleServiceProvider {

    /**

     * Sole constructor.  (For invocation by subclass constructors, typically

     * implicit.)

     */

    protected LocaleNameProvider() {

    }

    /**

     * Returns a localized name for the given <a href="http://www.rfc-editor.org/rfc/bcp/bcp47.txt">

     * IETF BCP47</a> language code and the given locale that is appropriate for

     * display to the user.

     * For example, if {@code languageCode} is "fr" and {@code locale}

     * is en_US, getDisplayLanguage() will return "French"; if {@code languageCode}

     * is "en" and {@code locale} is fr_FR, getDisplayLanguage() will return "anglais".

     * If the name returned cannot be localized according to {@code locale},

     * (say, the provider does not have a Japanese name for Croatian),

     * this method returns null.

     * @param languageCode the language code string in the form of two to eight

     *     lower-case letters between 'a' (U+0061) and 'z' (U+007A)

     * @param locale the desired locale

     * @return the name of the given language code for the specified locale, or null if it's not

     *     available.

     * @throws    NullPointerException if {@code languageCode} or {@code locale} is null

     * @throws    IllegalArgumentException if {@code languageCode} is not in the form of

     *     two or three lower-case letters, or {@code locale} isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.util.Locale#getDisplayLanguage(java.util.Locale)

     */

    public abstract String getDisplayLanguage(String languageCode, Locale locale);

    /**

     * Returns a localized name for the given <a href="http://www.rfc-editor.org/rfc/bcp/bcp47.txt">

     * IETF BCP47</a> script code and the given locale that is appropriate for

     * display to the user.

     * For example, if {@code scriptCode} is "Latn" and {@code locale}

     * is en_US, getDisplayScript() will return "Latin"; if {@code scriptCode}

     * is "Cyrl" and {@code locale} is fr_FR, getDisplayScript() will return "cyrillique".

     * If the name returned cannot be localized according to {@code locale},

     * (say, the provider does not have a Japanese name for Cyrillic),

     * this method returns null. The default implementation returns null.

     * @param scriptCode the four letter script code string in the form of title-case

     *     letters (the first letter is upper-case character between 'A' (U+0041) and

     *     'Z' (U+005A) followed by three lower-case character between 'a' (U+0061)

     *     and 'z' (U+007A)).

     * @param locale the desired locale

     * @return the name of the given script code for the specified locale, or null if it's not

     *     available.

     * @throws    NullPointerException if {@code scriptCode} or {@code locale} is null

     * @throws    IllegalArgumentException if {@code scriptCode} is not in the form of

     *     four title case letters, or {@code locale} isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.util.Locale#getDisplayScript(java.util.Locale)

     * @since 1.7

     */

    public String getDisplayScript(String scriptCode, Locale locale) {

        return null;

    }

    /**

     * Returns a localized name for the given <a href="http://www.rfc-editor.org/rfc/bcp/bcp47.txt">

     * IETF BCP47</a> region code (either ISO 3166 country code or UN M.49 area

     * codes) and the given locale that is appropriate for display to the user.

     * For example, if {@code countryCode} is "FR" and {@code locale}

     * is en_US, getDisplayCountry() will return "France"; if {@code countryCode}

     * is "US" and {@code locale} is fr_FR, getDisplayCountry() will return "Etats-Unis".

     * If the name returned cannot be localized according to {@code locale},

     * (say, the provider does not have a Japanese name for Croatia),

     * this method returns null.

     * @param countryCode the country(region) code string in the form of two

     *     upper-case letters between 'A' (U+0041) and 'Z' (U+005A) or the UN M.49 area code

     *     in the form of three digit letters between '0' (U+0030) and '9' (U+0039).

     * @param locale the desired locale

     * @return the name of the given country code for the specified locale, or null if it's not

     *     available.

     * @throws    NullPointerException if {@code countryCode} or {@code locale} is null

     * @throws    IllegalArgumentException if {@code countryCode} is not in the form of

     *     two upper-case letters or three digit letters, or {@code locale} isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.util.Locale#getDisplayCountry(java.util.Locale)

     */

    public abstract String getDisplayCountry(String countryCode, Locale locale);

    /**

     * Returns a localized name for the given variant code and the given locale that

     * is appropriate for display to the user.

     * If the name returned cannot be localized according to {@code locale},

     * this method returns null.

     * @param variant the variant string

     * @param locale the desired locale

     * @return the name of the given variant string for the specified locale, or null if it's not

     *     available.

     * @throws    NullPointerException if {@code variant} or {@code locale} is null

     * @throws    IllegalArgumentException if {@code locale} isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.util.Locale#getDisplayVariant(java.util.Locale)

     */

    public abstract String getDisplayVariant(String variant, Locale locale);

    /**

     * Returns a localized name for the given

     * <a href="../Locale.html#def_locale_extension">Unicode extension</a> key,

     * and the given locale that is appropriate for display to the user.

     * If the name returned cannot be localized according to {@code locale},

     * this method returns null.

     * @implSpec the default implementation returns {@code null}.

     * @param key the Unicode Extension key, not null.

     * @param locale the desired locale, not null.

     * @return the name of the given key string for the specified locale,

     *  or null if it's not available.

     * @throws    NullPointerException if {@code key} or {@code locale} is null

     * @throws    IllegalArgumentException if {@code locale} isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @since 10

     */

    public String getDisplayUnicodeExtensionKey(String key, Locale locale) {

        Objects.requireNonNull(key);

        Objects.requireNonNull(locale);

        return null;

    }

    /**

     * Returns a localized name for the given

     * <a href="../Locale.html#def_locale_extension">Unicode extension</a> type,

     * and the given locale that is appropriate for display to the user.

     * If the name returned cannot be localized according to {@code locale},

     * this method returns null.

     * @implSpec the default implementation returns {@code null}.

     * @param type the Unicode Extension type, not null.

     * @param key the Unicode Extension key for this {@code type}, not null.

     * @param locale the desired locale, not null.

     * @return the name of the given type string for the specified locale,

     *  or null if it's not available.

     * @throws    NullPointerException if {@code key}, {@code type} or {@code locale} is null

     * @throws    IllegalArgumentException if {@code locale} isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @since 10

     */

    public String getDisplayUnicodeExtensionType(String type, String key, Locale locale) {

        Objects.requireNonNull(type);

        Objects.requireNonNull(key);

        Objects.requireNonNull(locale);

        return null;

    }

}