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 * Copyright (c) 1999, 2016, 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.io.IOException;

import java.text.BreakIterator;

import java.text.spi.BreakIteratorProvider;

import java.util.Locale;

import java.util.MissingResourceException;

import java.util.Objects;

import java.util.Set;

import sun.text.DictionaryBasedBreakIterator;

import sun.text.RuleBasedBreakIterator;

/**

 * Concrete implementation of the  {@link java.text.spi.BreakIteratorProvider

 * BreakIteratorProvider} class for the JRE LocaleProviderAdapter.

 *

 * @author Naoto Sato

 * @author Masayoshi Okutsu

 */

public class BreakIteratorProviderImpl extends BreakIteratorProvider

                                       implements AvailableLanguageTags {

    private static final int CHARACTER_INDEX = 0;

    private static final int WORD_INDEX = 1;

    private static final int LINE_INDEX = 2;

    private static final int SENTENCE_INDEX = 3;

    private final LocaleProviderAdapter.Type type;

    private final Set<String> langtags;

    public BreakIteratorProviderImpl(LocaleProviderAdapter.Type type, Set<String> langtags) {

        this.type = type;

        this.langtags = langtags;

    }

    /**

     * Returns an array of all locales for which this locale service provider

     * can provide localized objects or names.

     *

     * @return An array of all locales for which this locale service provider

     * can provide localized objects or names.

     */

    @Override

    public Locale[] getAvailableLocales() {

        return LocaleProviderAdapter.toLocaleArray(langtags);

    }

    /**

     * Returns a new <code>BreakIterator</code> instance

     * for <a href="../BreakIterator.html#word">word breaks</a>

     * for the given locale.

     * @param locale the desired locale

     * @return A break iterator for word breaks

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.text.BreakIterator#getWordInstance(java.util.Locale)

     */

    @Override

    public BreakIterator getWordInstance(Locale locale) {

        return getBreakInstance(locale,

                                WORD_INDEX,

                                "WordData",

                                "WordDictionary");

    }

    /**

     * Returns a new <code>BreakIterator</code> instance

     * for <a href="../BreakIterator.html#line">line breaks</a>

     * for the given locale.

     * @param locale the desired locale

     * @return A break iterator for line breaks

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.text.BreakIterator#getLineInstance(java.util.Locale)

     */

    @Override

    public BreakIterator getLineInstance(Locale locale) {

        return getBreakInstance(locale,

                                LINE_INDEX,

                                "LineData",

                                "LineDictionary");

    }

    /**

     * Returns a new <code>BreakIterator</code> instance

     * for <a href="../BreakIterator.html#character">character breaks</a>

     * for the given locale.

     * @param locale the desired locale

     * @return A break iterator for character breaks

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.text.BreakIterator#getCharacterInstance(java.util.Locale)

     */

    @Override

    public BreakIterator getCharacterInstance(Locale locale) {

        return getBreakInstance(locale,

                                CHARACTER_INDEX,

                                "CharacterData",

                                "CharacterDictionary");

    }

    /**

     * Returns a new <code>BreakIterator</code> instance

     * for <a href="../BreakIterator.html#sentence">sentence breaks</a>

     * for the given locale.

     * @param locale the desired locale

     * @return A break iterator for sentence breaks

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @see java.text.BreakIterator#getSentenceInstance(java.util.Locale)

     */

    @Override

    public BreakIterator getSentenceInstance(Locale locale) {

        return getBreakInstance(locale,

                                SENTENCE_INDEX,

                                "SentenceData",

                                "SentenceDictionary");

    }

    private BreakIterator getBreakInstance(Locale locale,

                                           int type,

                                           String ruleName,

                                           String dictionaryName) {

        Objects.requireNonNull(locale);

        LocaleResources lr = LocaleProviderAdapter.forJRE().getLocaleResources(locale);

        String[] classNames = (String[]) lr.getBreakIteratorInfo("BreakIteratorClasses");

        String ruleFile = (String) lr.getBreakIteratorInfo(ruleName);

        byte[] ruleData = lr.getBreakIteratorResources(ruleName);

        try {

            switch (classNames[type]) {

            case "RuleBasedBreakIterator":

                return new RuleBasedBreakIterator(ruleFile, ruleData);

            case "DictionaryBasedBreakIterator":

                String dictionaryFile = (String) lr.getBreakIteratorInfo(dictionaryName);

                byte[] dictionaryData = lr.getBreakIteratorResources(dictionaryName);

                return new DictionaryBasedBreakIterator(ruleFile, ruleData,

                                                        dictionaryFile, dictionaryData);

            default:

                throw new IllegalArgumentException("Invalid break iterator class \"" +

                                classNames[type] + "\"");

            }

        } catch (MissingResourceException | IllegalArgumentException e) {

            throw new InternalError(e.toString(), e);

        }

    }

    @Override

    public Set<String> getAvailableLanguageTags() {

        return langtags;

    }

    @Override

    public boolean isSupportedLocale(Locale locale) {

        return LocaleProviderAdapter.forType(type).isSupportedProviderLocale(locale, langtags);

    }

}