https://openjdk.java.net/ 
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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// -- This file was mechanically generated: Do not edit! -- //

package sun.util;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.ResourceBundle.Control;


This is a convenient class for loading some of internal resources faster
if they are built with Resources.gmk defined in J2SE workspace. Also,
they have to be in class file format.
"LOCALE_LIST" will be replaced at built time by a list of locales we
defined in Defs.gmk. We want to exclude these locales from search to
gain better performance. For example, since we know if the resource
is built with Resources.gmk, they are not going to provide basename_en.class
& basename_en_US.class resources, in that case, continuing searching them
is expensive. By excluding them from the candidate locale list, these
resources won't be searched.

Since:1.6.
/**
 * This is a convenient class for loading some of internal resources faster
 * if they are built with Resources.gmk defined in J2SE workspace. Also,
 * they have to be in class file format.
 *
 * "LOCALE_LIST" will be replaced at built time by a list of locales we
 * defined in Defs.gmk. We want to exclude these locales from search to
 * gain better performance. For example, since we know if the resource
 * is built with Resources.gmk, they are not going to provide basename_en.class
 * & basename_en_US.class resources, in that case, continuing searching them
 * is expensive. By excluding them from the candidate locale list, these
 * resources won't be searched.
 *
 * @since 1.6.
 */
public class CoreResourceBundleControl extends ResourceBundle.Control {
    /* the candidate locale list to search */
    private final Collection<Locale> excludedJDKLocales;
    /* singlton instance of the resource bundle control. */
    private static CoreResourceBundleControl resourceBundleControlInstance =
        new CoreResourceBundleControl();

    protected CoreResourceBundleControl() {
        excludedJDKLocales = Arrays.asList(	Locale.GERMANY,	Locale.ENGLISH,	Locale.US, new Locale("es", "ES"),	Locale.FRANCE,	Locale.ITALY,	Locale.JAPAN,	Locale.KOREA, new Locale("sv", "SE"),	Locale.CHINESE);
    }

    
This method is to provide a customized ResourceBundle.Control to speed
up the search of resources in JDK.

Returns:the instance of resource bundle control.
/**
     * This method is to provide a customized ResourceBundle.Control to speed
     * up the search of resources in JDK.
     *
     * @return the instance of resource bundle control.
     */
    public static CoreResourceBundleControl getRBControlInstance() {
        return resourceBundleControlInstance;
    }

    
This method is to provide a customized ResourceBundle.Control to speed
up the search of resources in JDK, with the bundle's package name check.

Params:
  • bundleName – bundle name to check
Returns:the instance of resource bundle control if the bundle is JDK's,
   otherwise returns null.
/**
     * This method is to provide a customized ResourceBundle.Control to speed
     * up the search of resources in JDK, with the bundle's package name check.
     *
     * @param bundleName bundle name to check
     * @return the instance of resource bundle control if the bundle is JDK's,
     *    otherwise returns null.
     */
    public static CoreResourceBundleControl getRBControlInstance(String bundleName) {
        if (bundleName.startsWith("com.sun.") ||
            bundleName.startsWith("java.") ||
            bundleName.startsWith("javax.") ||
            bundleName.startsWith("sun.")) {
            return resourceBundleControlInstance;
        } else {
            return null;
        }
    }

    
Throws:
  • NullPointerException – if baseName or locale is null.
@returnsa list of candidate locales to search from.
/**
     * @returns a list of candidate locales to search from.
     * @exception NullPointerException if baseName or locale is null.
     */
    @Override
    public List<Locale> getCandidateLocales(String baseName, Locale locale) {
        List<Locale> candidates = super.getCandidateLocales(baseName, locale);
        candidates.removeAll(excludedJDKLocales);
        return candidates;
    }

    
@returns TTL_DONT_CACHE so that ResourceBundle instance won't be cached.
User of this CoreResourceBundleControl should probably maintain a hard reference
to the ResourceBundle object themselves.
/**
     * @ returns TTL_DONT_CACHE so that ResourceBundle instance won't be cached.
     * User of this CoreResourceBundleControl should probably maintain a hard reference
     * to the ResourceBundle object themselves.
     */
    @Override
    public long getTimeToLive(String baseName, Locale locale) {
        return ResourceBundle.Control.TTL_DONT_CACHE;
    }
}