/*

 * Copyright (c) 2005, 2019, 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.  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,

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

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package java.util.spi;

import java.util.Arrays;

import java.util.Currency;

import java.util.List;

import java.util.Locale;

import java.util.ResourceBundle.Control;

/**

 * An abstract class for service providers that

 * provide localized currency symbols and display names for the

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

 * Note that currency symbols are considered names when determining

 * behaviors described in the

 * {@link java.util.spi.LocaleServiceProvider LocaleServiceProvider}

 * specification.

 *

 * @since        1.6

 */

public abstract class CurrencyNameProvider extends LocaleServiceProvider {

    /**

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

     * implicit.)

     */

    protected CurrencyNameProvider() {

    }

    /**

     * Gets the symbol of the given currency code for the specified locale.

     * For example, for "USD" (US Dollar), the symbol is "$" if the specified

     * locale is the US, while for other locales it may be "US$". If no

     * symbol can be determined, null should be returned.

     *

     * @param currencyCode the ISO 4217 currency code, which

     *     consists of three upper-case letters between 'A' (U+0041) and

     *     'Z' (U+005A)

     * @param locale the desired locale

     * @return the symbol of the given currency code for the specified locale, or null if

     *     the symbol is not available for the locale

     * @throws    NullPointerException if {@code currencyCode} or

     *     {@code locale} is null

     * @throws    IllegalArgumentException if {@code currencyCode} is not in

     *     the form of three upper-case letters, or {@code locale} isn't

     *     one of the locales returned from

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

     *     getAvailableLocales()}.

     * @see java.util.Currency#getSymbol(java.util.Locale)

     */

    public abstract String getSymbol(String currencyCode, Locale locale);

    /**

     * Returns a name for the currency that is appropriate for display to the

     * user.  The default implementation returns null.

     *

     * @param currencyCode the ISO 4217 currency code, which

     *     consists of three upper-case letters between 'A' (U+0041) and

     *     'Z' (U+005A)

     * @param locale the desired locale

     * @return the name for the currency that is appropriate for display to the

     *     user, or null if the name is not available for the locale

     * @throws    IllegalArgumentException if {@code currencyCode} is not in

     *     the form of three upper-case letters, or {@code locale} isn't

     *     one of the locales returned from

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

     *     getAvailableLocales()}.

     * @throws    NullPointerException if {@code currencyCode} or

     *     {@code locale} is {@code null}

     * @since 1.7

     */

    public String getDisplayName(String currencyCode, Locale locale) {

        if (currencyCode == null || locale == null) {

            throw new NullPointerException();

        }

        // Check whether the currencyCode is valid

        char[] charray = currencyCode.toCharArray();

        if (charray.length != 3) {

            throw new IllegalArgumentException("The currencyCode is not in the form of three upper-case letters.");

        }

        for (char c : charray) {

            if (c < 'A' || c > 'Z') {

                throw new IllegalArgumentException("The currencyCode is not in the form of three upper-case letters.");

            }

        }

        // Check whether the locale is valid

        Control c = Control.getNoFallbackControl(Control.FORMAT_DEFAULT);

        for (Locale l : getAvailableLocales()) {

            if (c.getCandidateLocales("", l).contains(locale)) {

                return null;

            }

        }

        throw new IllegalArgumentException("The locale is not available");

    }

}