/*

 * Copyright (c) 2012, 2015, 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.cldr;

import java.io.File;

import java.security.AccessController;

import java.security.PrivilegedAction;

import java.text.spi.BreakIteratorProvider;

import java.text.spi.CollatorProvider;

import java.util.Collections;

import java.util.HashSet;

import java.util.Locale;

import java.util.ResourceBundle;

import java.util.Set;

import java.util.StringTokenizer;

import java.util.spi.TimeZoneNameProvider;

import sun.util.locale.provider.JRELocaleProviderAdapter;

import sun.util.locale.provider.LocaleProviderAdapter;

/**

 * LocaleProviderAdapter implementation for the CLDR locale data.

 *

 * @author Masayoshi Okutsu

 * @author Naoto Sato

 */

public class CLDRLocaleProviderAdapter extends JRELocaleProviderAdapter {

    private static final String LOCALE_DATA_JAR_NAME = "cldrdata.jar";

    public CLDRLocaleProviderAdapter() {

        final String sep = File.separator;

        String localeDataJar = java.security.AccessController.doPrivileged(

                    new sun.security.action.GetPropertyAction("java.home"))

                + sep + "lib" + sep + "ext" + sep + LOCALE_DATA_JAR_NAME;

        // Peek at the installed extension directory to see if the jar file for

        // CLDR resources is installed or not.

        final File f = new File(localeDataJar);

        boolean result = AccessController.doPrivileged(

                new PrivilegedAction<Boolean>() {

                    @Override

                    public Boolean run() {

                        return f.exists();

                    }

                });

        if (!result) {

            throw new UnsupportedOperationException();

        }

    }

    /**

     * Returns the type of this LocaleProviderAdapter

     * @return the type of this

     */

    @Override

    public LocaleProviderAdapter.Type getAdapterType() {

        return LocaleProviderAdapter.Type.CLDR;

    }

    @Override

    public BreakIteratorProvider getBreakIteratorProvider() {

        return null;

    }

    @Override

    public CollatorProvider getCollatorProvider() {

        return null;

    }

    @Override

    public Locale[] getAvailableLocales() {

        Set<String> all = createLanguageTagSet("All");

        Locale[] locs = new Locale[all.size()];

        int index = 0;

        for (String tag : all) {

            locs[index++] = Locale.forLanguageTag(tag);

        }

        return locs;

    }

    @Override

    protected Set<String> createLanguageTagSet(String category) {

        ResourceBundle rb = ResourceBundle.getBundle("sun.util.cldr.CLDRLocaleDataMetaInfo", Locale.ROOT);

        String supportedLocaleString = rb.getString(category);

        if (supportedLocaleString == null) {

            return Collections.emptySet();

        }

        Set<String> tagset = new HashSet<>();

        StringTokenizer tokens = new StringTokenizer(supportedLocaleString);

        while (tokens.hasMoreTokens()) {

            tagset.add(tokens.nextToken());

        }

        return tagset;

    }

}