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Java example source code file (CollatorProviderImpl.java)

This example Java source code file (CollatorProviderImpl.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

availablelanguagetags, collator, collatorproviderimpl, internalerror, locale, nullpointerexception, override, parseexception, set, string, text, util

The CollatorProviderImpl.java Java example source code

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

/*
 *
 * (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 instance for the specified locale.
     * @param locale the desired locale.
     * @return the <code>Collator for the desired locale.
     * @exception NullPointerException if
     * <code>locale is null
     * @exception IllegalArgumentException if <code>locale 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.
                throw new InternalError(bar);
            }
        }
        // Now that RuleBasedCollator adds expansions for pre-composed characters
        // into their decomposed equivalents, the default collators don't need
        // to have decomposition turned on.  Laura, 5/5/98, bug 4114077
        result.setDecomposition(Collator.NO_DECOMPOSITION);

        return (Collator)result.clone();
    }

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

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