/*

 * Copyright (c) 2012, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.util.locale.provider;

import java.security.AccessController;

import java.security.PrivilegedActionException;

import java.security.PrivilegedExceptionAction;

import java.text.BreakIterator;

import java.text.Collator;

import java.text.DateFormat;

import java.text.DateFormatSymbols;

import java.text.DecimalFormatSymbols;

import java.text.NumberFormat;

import java.text.spi.BreakIteratorProvider;

import java.text.spi.CollatorProvider;

import java.text.spi.DateFormatProvider;

import java.text.spi.DateFormatSymbolsProvider;

import java.text.spi.DecimalFormatSymbolsProvider;

import java.text.spi.NumberFormatProvider;

import java.util.Locale;

import java.util.Map;

import java.util.ServiceLoader;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.ConcurrentMap;

import java.util.spi.CalendarDataProvider;

import java.util.spi.CalendarNameProvider;

import java.util.spi.CurrencyNameProvider;

import java.util.spi.LocaleNameProvider;

import java.util.spi.LocaleServiceProvider;

import java.util.spi.TimeZoneNameProvider;

/**

 * LocaleProviderAdapter implementation for the installed SPI implementations.

 *

 * @author Naoto Sato

 * @author Masayoshi Okutsu

 */

public class SPILocaleProviderAdapter extends AuxLocaleProviderAdapter {

    /**

     * Returns the type of this LocaleProviderAdapter

     */

    @Override

    public LocaleProviderAdapter.Type getAdapterType() {

        return LocaleProviderAdapter.Type.SPI;

    }

    @Override

    protected <P extends LocaleServiceProvider> P findInstalledProvider(final Class<P> c) {

        try {

            return AccessController.doPrivileged(new PrivilegedExceptionAction<P>() {

                @Override

                @SuppressWarnings("unchecked")

                public P run() {

                    P delegate = null;

                    for (LocaleServiceProvider provider : ServiceLoader.loadInstalled(c)) {

                        if (delegate == null) {

                            try {

                                delegate =

                                    (P) Class.forName(SPILocaleProviderAdapter.class.getCanonicalName() +

                                              "$" +

                                              c.getSimpleName() +

                                              "Delegate")

                                              .newInstance();

                            }  catch (ClassNotFoundException |

                                      InstantiationException |

                                      IllegalAccessException e) {

                                LocaleServiceProviderPool.config(SPILocaleProviderAdapter.class, e.toString());

                                return null;

                            }

                        }

                        ((Delegate)delegate).addImpl(provider);

                    }

                    return delegate;

                }

            });

        }  catch (PrivilegedActionException e) {

            LocaleServiceProviderPool.config(SPILocaleProviderAdapter.class, e.toString());

        }

        return null;

    }

    /*

     * Delegate interface. All the implementations have to have the class name

     * following "<provider class name>Delegate" convention.

     */

    interface Delegate<P extends LocaleServiceProvider> {

        public void addImpl(P impl);

        public P getImpl(Locale locale);

    }

    /*

     * Obtain the real SPI implementation, using locale fallback

     */

    private static <P extends LocaleServiceProvider> P getImpl(Map<Locale, P> map, Locale locale) {

        for (Locale l : LocaleServiceProviderPool.getLookupLocales(locale)) {

            P ret = map.get(l);

            if (ret != null) {

                return ret;

            }

        }

        return null;

    }

    /*

     * Delegates for the actual SPI implementations.

     */

    static class BreakIteratorProviderDelegate extends BreakIteratorProvider

                                        implements Delegate<BreakIteratorProvider> {

        private ConcurrentMap<Locale, BreakIteratorProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(BreakIteratorProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public BreakIteratorProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public BreakIterator getWordInstance(Locale locale) {

            BreakIteratorProvider bip = getImpl(locale);

            assert bip != null;

            return bip.getWordInstance(locale);

        }

        @Override

        public BreakIterator getLineInstance(Locale locale) {

            BreakIteratorProvider bip = getImpl(locale);

            assert bip != null;

            return bip.getLineInstance(locale);

        }

        @Override

        public BreakIterator getCharacterInstance(Locale locale) {

            BreakIteratorProvider bip = getImpl(locale);

            assert bip != null;

            return bip.getCharacterInstance(locale);

        }

        @Override

        public BreakIterator getSentenceInstance(Locale locale) {

            BreakIteratorProvider bip = getImpl(locale);

            assert bip != null;

            return bip.getSentenceInstance(locale);

        }

    }

    static class CollatorProviderDelegate extends CollatorProvider implements Delegate<CollatorProvider> {

        private ConcurrentMap<Locale, CollatorProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(CollatorProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public CollatorProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public Collator getInstance(Locale locale) {

            CollatorProvider cp = getImpl(locale);

            assert cp != null;

            return cp.getInstance(locale);

        }

    }

    static class DateFormatProviderDelegate extends DateFormatProvider

                                     implements Delegate<DateFormatProvider> {

        private ConcurrentMap<Locale, DateFormatProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(DateFormatProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public DateFormatProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public DateFormat getTimeInstance(int style, Locale locale) {

            DateFormatProvider dfp = getImpl(locale);

            assert dfp != null;

            return dfp.getTimeInstance(style, locale);

        }

        @Override

        public DateFormat getDateInstance(int style, Locale locale) {

            DateFormatProvider dfp = getImpl(locale);

            assert dfp != null;

            return dfp.getDateInstance(style, locale);

        }

        @Override

        public DateFormat getDateTimeInstance(int dateStyle, int timeStyle, Locale locale) {

            DateFormatProvider dfp = getImpl(locale);

            assert dfp != null;

            return dfp.getDateTimeInstance(dateStyle, timeStyle, locale);

        }

    }

    static class DateFormatSymbolsProviderDelegate extends DateFormatSymbolsProvider

                                            implements Delegate<DateFormatSymbolsProvider> {

        private ConcurrentMap<Locale, DateFormatSymbolsProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(DateFormatSymbolsProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public DateFormatSymbolsProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public DateFormatSymbols getInstance(Locale locale) {

            DateFormatSymbolsProvider dfsp = getImpl(locale);

            assert dfsp != null;

            return dfsp.getInstance(locale);

        }

    }

    static class DecimalFormatSymbolsProviderDelegate extends DecimalFormatSymbolsProvider

                                               implements Delegate<DecimalFormatSymbolsProvider> {

        private ConcurrentMap<Locale, DecimalFormatSymbolsProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(DecimalFormatSymbolsProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public DecimalFormatSymbolsProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public DecimalFormatSymbols getInstance(Locale locale) {

            DecimalFormatSymbolsProvider dfsp = getImpl(locale);

            assert dfsp != null;

            return dfsp.getInstance(locale);

        }

    }

    static class NumberFormatProviderDelegate extends NumberFormatProvider

                                       implements Delegate<NumberFormatProvider> {

        private ConcurrentMap<Locale, NumberFormatProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(NumberFormatProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public NumberFormatProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public NumberFormat getCurrencyInstance(Locale locale) {

            NumberFormatProvider nfp = getImpl(locale);

            assert nfp != null;

            return nfp.getCurrencyInstance(locale);

        }

        @Override

        public NumberFormat getIntegerInstance(Locale locale) {

            NumberFormatProvider nfp = getImpl(locale);

            assert nfp != null;

            return nfp.getIntegerInstance(locale);

        }

        @Override

        public NumberFormat getNumberInstance(Locale locale) {

            NumberFormatProvider nfp = getImpl(locale);

            assert nfp != null;

            return nfp.getNumberInstance(locale);

        }

        @Override

        public NumberFormat getPercentInstance(Locale locale) {

            NumberFormatProvider nfp = getImpl(locale);

            assert nfp != null;

            return nfp.getPercentInstance(locale);

        }

    }

    static class CalendarDataProviderDelegate extends CalendarDataProvider

                                       implements Delegate<CalendarDataProvider> {

        private ConcurrentMap<Locale, CalendarDataProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(CalendarDataProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public CalendarDataProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public int getFirstDayOfWeek(Locale locale) {

            CalendarDataProvider cdp = getImpl(locale);

            assert cdp != null;

            return cdp.getFirstDayOfWeek(locale);

        }

        @Override

        public int getMinimalDaysInFirstWeek(Locale locale) {

            CalendarDataProvider cdp = getImpl(locale);

            assert cdp != null;

            return cdp.getMinimalDaysInFirstWeek(locale);

        }

    }

    static class CalendarNameProviderDelegate extends CalendarNameProvider

                                       implements Delegate<CalendarNameProvider> {

        private ConcurrentMap<Locale, CalendarNameProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(CalendarNameProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public CalendarNameProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);

        }

        @Override

        public boolean isSupportedLocale(Locale locale) {

            return map.containsKey(locale);

        }

        @Override

        public String getDisplayName(String calendarType,

                                              int field, int value,

                                              int style, Locale locale) {

            CalendarNameProvider cdp = getImpl(locale);

            assert cdp != null;

            return cdp.getDisplayName(calendarType, field, value, style, locale);

        }

        @Override

        public Map<String, Integer> getDisplayNames(String calendarType,

                                                             int field, int style,

                                                             Locale locale) {

            CalendarNameProvider cdp = getImpl(locale);

            assert cdp != null;

            return cdp.getDisplayNames(calendarType, field, style, locale);

        }

    }

    static class CurrencyNameProviderDelegate extends CurrencyNameProvider

                                       implements Delegate<CurrencyNameProvider> {

        private ConcurrentMap<Locale, CurrencyNameProvider> map = new ConcurrentHashMap<>();

        @Override

        public void addImpl(CurrencyNameProvider impl) {

            for (Locale l : impl.getAvailableLocales()) {

                map.putIfAbsent(l, impl);

            }

        }

        @Override

        public CurrencyNameProvider getImpl(Locale locale) {

            return SPILocaleProviderAdapter.getImpl(map, locale);

        }

        @Override

        public Locale[] getAvailableLocales() {

            return map.keySet().toArray(new Locale[0]);