/*
 * Copyright (c) 2012, 2014, 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 sun.util.locale.provider;

import java.util.Locale;
import java.util.Set;
import java.util.spi.CalendarDataProvider;

/**
 * Concrete implementation of the  {@link java.util.spi.CalendarDataProvider
 * CalendarDataProvider} class for the JRE LocaleProviderAdapter.
 *
 * @author Masayoshi Okutsu
 * @author Naoto Sato
 */
public class CalendarDataProviderImpl extends CalendarDataProvider implements AvailableLanguageTags {
    private final LocaleProviderAdapter.Type type;
    private Set<String> langtags;

    public CalendarDataProviderImpl(LocaleProviderAdapter.Type type) {
        this.type = type;
    }

    @Override
    public int getFirstDayOfWeek(Locale locale) {
        return LocaleProviderAdapter.forType(type).getLocaleResources(locale)
                   .getCalendarData(CalendarDataUtility.FIRST_DAY_OF_WEEK);
    }

    @Override
    public int getMinimalDaysInFirstWeek(Locale locale) {
        return LocaleProviderAdapter.forType(type).getLocaleResources(locale)
                   .getCalendarData(CalendarDataUtility.MINIMAL_DAYS_IN_FIRST_WEEK);
    }

    @Override
    public Locale[] getAvailableLocales() {
        return LocaleProviderAdapter.toLocaleArray(getLangTags());
    }

    @Override
    public Set<String> getAvailableLanguageTags() {
        return getLangTags();
    }

    private Set<String> getLangTags() {
        if (langtags == null) {
            langtags = ((JRELocaleProviderAdapter)LocaleProviderAdapter.forType(type)).getLanguageTagSet("CalendarData");
        }
        return langtags;
    }
}