/**
 *******************************************************************************
 * Copyright (C) 2001-2011, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.util;

import java.io.Serializable;
import java.text.ParsePosition;
import java.util.Date;
import java.util.Locale;

import com.ibm.icu.util.ULocale.Category;

/**
 * A class encapsulating a currency, as defined by ISO 4217.  A
 * <tt>Currency</tt> object can be created given a <tt>Locale</tt> or
 * given an ISO 4217 code.  Once created, the <tt>Currency</tt> object
 * can return various data necessary to its proper display:
 *
 * <ul><li>A display symbol, for a specific locale
 * <li>The number of fraction digits to display
 * <li>A rounding increment
 * </ul>
 *
 * The <tt>DecimalFormat</tt> class uses these data to display
 * currencies.
 *
 * <p>Note: This class deliberately resembles
 * <tt>java.util.Currency</tt> but it has a completely independent
 * implementation, and adds features not present in the JDK.
 * @author Alan Liu
 * @stable ICU 2.2
 */
public class Currency implements Serializable {
    private static final long serialVersionUID = 1L;

    /**
     * @internal
     */
    public final java.util.Currency currency;

    /**
     * @internal
     * @param delegate the NumberFormat to which to delegate
     */
    public Currency(java.util.Currency delegate) {
        this.currency = delegate;
    }

    /**
     * Selector for getName() indicating a symbolic name for a
     * currency, such as "$" for USD.
     * @stable ICU 2.6
     */
    public static final int SYMBOL_NAME = 0;

    /**
     * Selector for ucurr_getName indicating the long name for a
     * currency, such as "US Dollar" for USD.
     * @stable ICU 2.6
     */
    public static final int LONG_NAME = 1;
   
    /**
     * Selector for getName() indicating the plural long name for a 
     * currency, such as "US dollar" for USD in "1 US dollar", 
     * and "US dollars" for USD in "2 US dollars".
     * @stable ICU 4.2
     */
    public static final int PLURAL_LONG_NAME = 2;

    /**
     * Returns a currency object for the default currency in the given
     * locale.
     * @param locale the locale
     * @return the currency object for this locale
     * @stable ICU 2.2
     */
    public static Currency getInstance(Locale locale) {
        return new Currency(java.util.Currency.getInstance(locale));
    }

    /**
     * Returns a currency object for the default currency in the given
     * locale.
     * @stable ICU 3.2
     */
    public static Currency getInstance(ULocale locale) {
        return new Currency(java.util.Currency.getInstance(locale.toLocale()));
    }

    /**
     * Returns an array of Strings which contain the currency
     * identifiers that are valid for the given locale on the 
     * given date.  If there are no such identifiers, returns null.
     * Returned identifiers are in preference order.
     * @param loc the locale for which to retrieve currency codes.
     * @param d the date for which to retrieve currency codes for the given locale.
     * @return The array of ISO currency codes.
     * @stable ICU 4.0
     */
    public static String[] getAvailableCurrencyCodes(ULocale loc, Date d) {
        throw new UnsupportedOperationException("Method not supproted by com.ibm.icu.base");
    }

    /**
     * Returns a currency object given an ISO 4217 3-letter code.
     * @param theISOCode the iso code
     * @return the currency for this iso code
     * @throws NullPointerException if <code>theISOCode</code> is null.
     * @throws IllegalArgumentException if <code>theISOCode</code> is not a
     *         3-letter alpha code.
     * @stable ICU 2.2
     */
    public static Currency getInstance(String theISOCode) {
        return new Currency(java.util.Currency.getInstance(theISOCode));
    }

    /**
     * Registers a new currency for the provided locale.  The returned object
     * is a key that can be used to unregister this currency object.
     * @param currency the currency to register
     * @param locale the ulocale under which to register the currency
     * @return a registry key that can be used to unregister this currency
     * @see #unregister
     * @stable ICU 3.2
     */
    public static Object registerInstance(Currency currency, ULocale locale) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Unregister the currency associated with this key (obtained from
     * registerInstance).
     * @param registryKey the registry key returned from registerInstance
     * @see #registerInstance
     * @stable ICU 2.6
     */
    public static boolean unregister(Object registryKey) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Return an array of the locales for which a currency
     * is defined.
     * @return an array of the available locales
     * @stable ICU 2.2
     */
    public static Locale[] getAvailableLocales() {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Return an array of the ulocales for which a currency
     * is defined.
     * @return an array of the available ulocales
     * @stable ICU 3.2
     */
    public static ULocale[] getAvailableULocales() {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Given a key and a locale, returns an array of values for the key for which data
     * exists.  If commonlyUsed is true, these are the values that typically are used
     * with this locale, otherwise these are all values for which data exists.  
     * This is a common service API.
     * <p>
     * The only supported key is "currency", other values return an empty array.
     * <p>
     * Currency information is based on the region of the locale.  If the locale does not
     * indicate a region, {@link ULocale#addLikelySubtags(ULocale)} is used to infer a region,
     * except for the 'und' locale.
     * <p>
     * If commonlyUsed is true, only the currencies known to be in use as of the current date
     * are returned.  When there are more than one, these are returned in preference order
     * (typically, this occurs when a country is transitioning to a new currency, and the
     * newer currency is preferred), see 
     * <a href="http://unicode.org/reports/tr35/#Supplemental_Currency_Data">Unicode TR#35 Sec. C1</a>.  
     * If commonlyUsed is false, all currencies ever used in any locale are returned, in no
     * particular order.
     * 
     * @param key           key whose values to look up.  the only recognized key is "currency"
     * @param locale        the locale
     * @param commonlyUsed  if true, return only values that are currently used in the locale.
     *                      Otherwise returns all values.
     * @return an array of values for the given key and the locale.  If there is no data, the
     *   array will be empty.
     * @stable ICU 4.2
     */
    public static final String[] getKeywordValuesForLocale(String key, ULocale locale, 
            boolean commonlyUsed) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Return a hashcode for this currency.
     * @stable ICU 2.2
     */
    public int hashCode() {
        return currency.hashCode();
    }

    /**
     * Return true if rhs is a Currency instance,
     * is non-null, and has the same currency code.
     * @stable ICU 2.2
     */
    public boolean equals(Object rhs) {
        try {
            return currency.equals(((Currency)rhs).currency);
        }
        catch (Exception e) {
            return false;
        }
    }

    /**
     * Returns the ISO 4217 3-letter code for this currency object.
     * @stable ICU 2.2
     */
    public String getCurrencyCode() {
        return currency.getCurrencyCode();
    }

    /**
     * Convenience and compatibility override of getName that
     * requests the symbol name.
     * @see #getName
     * @stable ICU 3.4
     */
    public String getSymbol() {
        return currency.getSymbol(ULocale.getDefault(Category.DISPLAY).toLocale());
    }

    /**
     * Convenience and compatibility override of getName that
     * requests the symbol name.
     * @param loc the Locale for the symbol
     * @see #getName
     * @stable ICU 3.4
     */
    public String getSymbol(Locale loc) {
        return currency.getSymbol(loc);
    }

    /**
     * Convenience and compatibility override of getName that
     * requests the symbol name.
     * @param uloc the ULocale for the symbol
     * @see #getName
     * @stable ICU 3.4
     */
    public String getSymbol(ULocale uloc) {
        return currency.getSymbol(uloc.toLocale());
    }

    /**
     * Returns the display name for the given currency in the
     * given locale.  
     * This is a convenient method for 
     * getName(ULocale, int, boolean[]); 
     * @stable ICU 3.2
     */
    public String getName(Locale locale,
                          int nameStyle,
                          boolean[] isChoiceFormat) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Returns the display name for the given currency in the
     * given locale.  For example, the display name for the USD
     * currency object in the en_US locale is "$".
     * @param locale locale in which to display currency
     * @param nameStyle selector for which kind of name to return.
     *                  The nameStyle should be either SYMBOL_NAME or 
     *                  LONG_NAME. Otherwise, throw IllegalArgumentException.
     * @param isChoiceFormat fill-in; isChoiceFormat[0] is set to true
     * if the returned value is a ChoiceFormat pattern; otherwise it
     * is set to false
     * @return display string for this currency.  If the resource data
     * contains no entry for this currency, then the ISO 4217 code is
     * returned.  If isChoiceFormat[0] is true, then the result is a
     * ChoiceFormat pattern.  Otherwise it is a static string. <b>Note:</b>
     * as of ICU 4.4, choice formats are not used, and the value returned
     * in isChoiceFormat is always false.
     * <p>
     * @throws  IllegalArgumentException  if the nameStyle is not SYMBOL_NAME
     *                                    or LONG_NAME.
     * @see #getName(ULocale, int, String, boolean[])
     * @stable ICU 3.2
     */
    public String getName(ULocale locale, int nameStyle, boolean[] isChoiceFormat) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Returns the display name for the given currency in the given locale.  
     * This is a convenience overload of getName(ULocale, int, String, boolean[]);
     * @stable ICU 4.2
     */
    public String getName(Locale locale, int nameStyle, String pluralCount,
            boolean[] isChoiceFormat) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Returns the display name for the given currency in the
     * given locale.  For example, the SYMBOL_NAME for the USD
     * currency object in the en_US locale is "$".
     * The PLURAL_LONG_NAME for the USD currency object when the currency 
     * amount is plural is "US dollars", such as in "3.00 US dollars";
     * while the PLURAL_LONG_NAME for the USD currency object when the currency
     * amount is singular is "US dollar", such as in "1.00 US dollar".
     * @param locale locale in which to display currency
     * @param nameStyle selector for which kind of name to return
     * @param pluralCount plural count string for this locale
     * @param isChoiceFormat fill-in; isChoiceFormat[0] is set to true
     * if the returned value is a ChoiceFormat pattern; otherwise it
     * is set to false
     * @return display string for this currency.  If the resource data
     * contains no entry for this currency, then the ISO 4217 code is
     * returned.  If isChoiceFormat[0] is true, then the result is a
     * ChoiceFormat pattern.  Otherwise it is a static string. <b>Note:</b>
     * as of ICU 4.4, choice formats are not used, and the value returned
     * in isChoiceFormat is always false.
     * @throws  IllegalArgumentException  if the nameStyle is not SYMBOL_NAME,
     *                                    LONG_NAME, or PLURAL_LONG_NAME.
     * @stable ICU 4.2
     */
    public String getName(ULocale locale, int nameStyle, String pluralCount,
            boolean[] isChoiceFormat) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Attempt to parse the given string as a currency, either as a
     * display name in the given locale, or as a 3-letter ISO 4217
     * code.  If multiple display names match, then the longest one is
     * selected.  If both a display name and a 3-letter ISO code
     * match, then the display name is preferred, unless it's length
     * is less than 3.
     *
     * @param locale the locale of the display names to match
     * @param text the text to parse
     * @param type parse against currency type: LONG_NAME only or not
     * @param pos input-output position; on input, the position within
     * text to match; must have 0 <= pos.getIndex() < text.length();
     * on output, the position after the last matched character. If
     * the parse fails, the position in unchanged upon output.
     * @return the ISO 4217 code, as a string, of the best match, or
     * null if there is no match
     *
     * @internal
     * @deprecated This API is ICU internal only.
     */
    public static String parse(ULocale locale, String text, int type, ParsePosition pos) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Returns the number of the number of fraction digits that should
     * be displayed for this currency.
     * @return a non-negative number of fraction digits to be
     * displayed
     * @stable ICU 2.2
     */
    public int getDefaultFractionDigits() {
        return currency.getDefaultFractionDigits();
    }

    /**
     * Returns the rounding increment for this currency, or 0.0 if no
     * rounding is done by this currency.
     * @return the non-negative rounding increment, or 0.0 if none
     * @stable ICU 2.2
     */
    public double getRoundingIncrement() {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }

    /**
     * Returns the ISO 4217 code for this currency.
     * @stable ICU 2.2
     */
    public String toString() {
        return currency.toString();
    }

    /**
     * Return the locale that was used to create this object, or null.
     * This may may differ from the locale requested at the time of
     * this object's creation.  For example, if an object is created
     * for locale <tt>en_US_CALIFORNIA</tt>, the actual data may be
     * drawn from <tt>en</tt> (the <i>actual</i> locale), and
     * <tt>en_US</tt> may be the most specific locale that exists (the
     * <i>valid</i> locale).
     *
     * <p>Note: This method will be obsoleted.  The implementation is
     * no longer locale-specific and so there is no longer a valid or
     * actual locale associated with the Currency object.  Until
     * it is removed, this method will return the root locale.
     * @param type type of information requested, either {@link
     * com.ibm.icu.util.ULocale#VALID_LOCALE} or {@link
     * com.ibm.icu.util.ULocale#ACTUAL_LOCALE}.
     * @return the information specified by <i>type</i>, or null if
     * this object was not constructed from locale data.
     * @see com.ibm.icu.util.ULocale
     * @see com.ibm.icu.util.ULocale#VALID_LOCALE
     * @see com.ibm.icu.util.ULocale#ACTUAL_LOCALE
     * @obsolete ICU 3.2 to be removed
     * @deprecated This API is obsolete.
     */
    public final ULocale getLocale(ULocale.Type type) {
        throw new UnsupportedOperationException("Method not supported by com.ibm.icu.base");
    }
}

//eof
