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/*
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* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#warn This file is preprocessed before being compiled
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package sun.util;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Locale;
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import java.util.ResourceBundle;
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import java.util.ResourceBundle.Control;
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/**
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* This is a convenient class for loading some of internal resources faster
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* if they are built with Resources.gmk defined in J2SE workspace. Also,
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* they have to be in class file format.
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*
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* "LOCALE_LIST" will be replaced at built time by a list of locales we
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* defined in Defs.gmk. We want to exclude these locales from search to
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* gain better performance. For example, since we know if the resource
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* is built with Resources.gmk, they are not going to provide basename_en.class
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* & basename_en_US.class resources, in that case, continuing searching them
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* is expensive. By excluding them from the candidate locale list, these
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* resources won't be searched.
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*
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* @since 1.6.
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*/
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public class CoreResourceBundleControl extends ResourceBundle.Control {
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/* the candidate locale list to search */
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private final Collection<Locale> excludedJDKLocales;
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/* singlton instance of the resource bundle control. */
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private static CoreResourceBundleControl resourceBundleControlInstance =
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new CoreResourceBundleControl();
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protected CoreResourceBundleControl() {
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excludedJDKLocales = Arrays.asList(#LOCALE_LIST#);
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}
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/**
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* This method is to provide a customized ResourceBundle.Control to speed
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* up the search of resources in JDK.
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*
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* @return the instance of resource bundle control.
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*/
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public static CoreResourceBundleControl getRBControlInstance() {
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return resourceBundleControlInstance;
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}
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/**
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* This method is to provide a customized ResourceBundle.Control to speed
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* up the search of resources in JDK, with the bundle's package name check.
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*
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* @param bundleName bundle name to check
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* @return the instance of resource bundle control if the bundle is JDK's,
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* otherwise returns null.
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*/
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public static CoreResourceBundleControl getRBControlInstance(String bundleName) {
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if (bundleName.startsWith("com.sun.") ||
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bundleName.startsWith("java.") ||
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bundleName.startsWith("javax.") ||
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bundleName.startsWith("sun.")) {
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return resourceBundleControlInstance;
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} else {
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return null;
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}
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}
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/**
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* @returns a list of candidate locales to search from.
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* @exception NullPointerException if baseName or locale is null.
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*/
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@Override
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public List<Locale> getCandidateLocales(String baseName, Locale locale) {
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List<Locale> candidates = super.getCandidateLocales(baseName, locale);
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candidates.removeAll(excludedJDKLocales);
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return candidates;
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}
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/**
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* @ returns TTL_DONT_CACHE so that ResourceBundle instance won't be cached.
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* User of this CoreResourceBundleControl should probably maintain a hard reference
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* to the ResourceBundle object themselves.
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*/
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@Override
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public long getTimeToLive(String baseName, Locale locale) {
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return ResourceBundle.Control.TTL_DONT_CACHE;
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}
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}
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