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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 Currency class. Note that currency symbols are considered names when determining behaviors described in the LocaleServiceProvider specification. 
Since:
       1.6/**
 * 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.)
/**
     * 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.
Params:
currencyCode – the ISO 4217 currency code, which
    consists of three upper-case letters between 'A' (U+0041) and
    'Z' (U+005A)
locale – the desired locale
Throws:
NullPointerException – if currencyCode or
    locale is null
IllegalArgumentException – if currencyCode is not in
    the form of three upper-case letters, or locale isn't one of the locales returned from 
    getAvailableLocales().
See Also:
Currency.getSymbol(Locale)
Returns:
the symbol of the given currency code for the specified locale, or null if
    the symbol is not available for the locale/**
     * 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
     * @exception NullPointerException if <code>currencyCode</code> or
     *     <code>locale</code> is null
     * @exception IllegalArgumentException if <code>currencyCode</code> is not in
     *     the form of three upper-case letters, or <code>locale</code> 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.
Params:
currencyCode – the ISO 4217 currency code, which
    consists of three upper-case letters between 'A' (U+0041) and
    'Z' (U+005A)
locale – the desired locale
Throws:
IllegalArgumentException – if currencyCode is not in
    the form of three upper-case letters, or locale isn't one of the locales returned from 
    getAvailableLocales().
NullPointerException – if currencyCode or
    locale is null
Returns:
the name for the currency that is appropriate for display to the
    user, or null if the name is not available for the locale
Since:
1.7/**
     * 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
     * @exception IllegalArgumentException if <code>currencyCode</code> is not in
     *     the form of three upper-case letters, or <code>locale</code> isn't
     *     one of the locales returned from
     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
     *     getAvailableLocales()}.
     * @exception NullPointerException if <code>currencyCode</code> or
     *     <code>locale</code> is <code>null</code>
     * @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");
    }
}