JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1999, 2013, 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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/*
 *
 * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
 * (C) Copyright IBM Corp. 1996 - 2002 - All Rights Reserved
 *
 * The original version of this source code and documentation
 * is copyrighted and owned by Taligent, Inc., a wholly-owned
 * subsidiary of IBM. These materials are provided under terms
 * of a License Agreement between Taligent and Sun. This technology
 * is protected by multiple US and International patents.
 *
 * This notice and attribution to Taligent may not be removed.
 * Taligent is a registered trademark of Taligent, Inc.
 */

package sun.util.locale.provider;

import java.text.Collator;
import java.text.ParseException;
import java.text.RuleBasedCollator;
import java.text.spi.CollatorProvider;
import java.util.Locale;
import java.util.Set;

/**
 * Concrete implementation of the
 * {@link java.text.spi.CollatorProvider CollatorProvider} class
 * for the JRE LocaleProviderAdapter.
 */
public class CollatorProviderImpl extends CollatorProvider implements AvailableLanguageTags {
    private final LocaleProviderAdapter.Type type;
    private final Set<String> langtags;

    public CollatorProviderImpl(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);
    }

    @Override
    public boolean isSupportedLocale(Locale locale) {
        return LocaleProviderAdapter.isSupportedLocale(locale, type, langtags);
    }

    /**
     * Returns a new <code>Collator</code> instance for the specified locale.
     * @param locale the desired locale.
     * @return the <code>Collator</code> for the desired locale.
     * @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.Collator#getInstance(java.util.Locale)
     */
    @Override
    public Collator getInstance(Locale locale) {
        if (locale == null) {
            throw new NullPointerException();
        }

        Collator result = null;

        // Load the resource of the desired locale from resource
        // manager.
        String colString = LocaleProviderAdapter.forType(type).getLocaleResources(locale).getCollationData();
        try
        {
            result = new RuleBasedCollator(CollationRules.DEFAULTRULES +
                                           colString);
        }
        catch(ParseException foo)
        {
            // predefined tables should contain correct grammar
            try {
                result = new RuleBasedCollator(CollationRules.DEFAULTRULES);
            } catch (ParseException bar) {
                // the default rules should always be parsable.

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