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| 1 | +/* | |
| 2 | + * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +#warn This file is preprocessed before being compiled | |
| 27 | + | |
| 28 | +package sun.util; | |
| 29 | + | |
| 30 | +import java.util.Arrays; | |
| 31 | +import java.util.Collection; | |
| 32 | +import java.util.Collections; | |
| 33 | +import java.util.HashSet; | |
| 34 | +import java.util.List; | |
| 35 | +import java.util.Locale; | |
| 36 | +import java.util.ResourceBundle; | |
| 37 | +import java.util.ResourceBundle.Control; | |
| 38 | + | |
| 39 | +/** | |
| 40 | + * This is a convenient class for loading some of internal resources faster | |
| 41 | + * if they are built with Resources.gmk defined in J2SE workspace. Also, | |
| 42 | + * they have to be in class file format. | |
| 43 | + * | |
| 44 | + * "LOCALE_LIST" will be replaced at built time by a list of locales we | |
| 45 | + * defined in Defs.gmk. We want to exclude these locales from search to | |
| 46 | + * gain better performance. For example, since we know if the resource | |
| 47 | + * is built with Resources.gmk, they are not going to provide basename_en.class | |
| 48 | + * & basename_en_US.class resources, in that case, continuing searching them | |
| 49 | + * is expensive. By excluding them from the candidate locale list, these | |
| 50 | + * resources won't be searched. | |
| 51 | + * | |
| 52 | + * @since 1.6. | |
| 53 | + */ | |
| 54 | +public class CoreResourceBundleControl extends ResourceBundle.Control { | |
| 55 | + /* the candidate locale list to search */ | |
| 56 | + private final Collection<Locale> excludedJDKLocales; | |
| 57 | + /* singlton instance of the resource bundle control. */ | |
| 58 | + private static CoreResourceBundleControl resourceBundleControlInstance = | |
| 59 | + new CoreResourceBundleControl(); | |
| 60 | + | |
| 61 | + protected CoreResourceBundleControl() { | |
| 62 | + excludedJDKLocales = Arrays.asList(#LOCALE_LIST#); | |
| 63 | + } | |
| 64 | + | |
| 65 | + /** | |
| 66 | + * This method is to provide a customized ResourceBundle.Control to speed | |
| 67 | + * up the search of resources in JDK. | |
| 68 | + * | |
| 69 | + * @return the instance of resource bundle control. | |
| 70 | + */ | |
| 71 | + public static CoreResourceBundleControl getRBControlInstance() { | |
| 72 | + return resourceBundleControlInstance; | |
| 73 | + } | |
| 74 | + | |
| 75 | + /** | |
| 76 | + * This method is to provide a customized ResourceBundle.Control to speed | |
| 77 | + * up the search of resources in JDK, with the bundle's package name check. | |
| 78 | + * | |
| 79 | + * @param bundleName bundle name to check | |
| 80 | + * @return the instance of resource bundle control if the bundle is JDK's, | |
| 81 | + * otherwise returns null. | |
| 82 | + */ | |
| 83 | + public static CoreResourceBundleControl getRBControlInstance(String bundleName) { | |
| 84 | + if (bundleName.startsWith("com.sun.") || | |
| 85 | + bundleName.startsWith("java.") || | |
| 86 | + bundleName.startsWith("javax.") || | |
| 87 | + bundleName.startsWith("sun.")) { | |
| 88 | + return resourceBundleControlInstance; | |
| 89 | + } else { | |
| 90 | + return null; | |
| 91 | + } | |
| 92 | + } | |
| 93 | + | |
| 94 | + /** | |
| 95 | + * @returns a list of candidate locales to search from. | |
| 96 | + * @exception NullPointerException if baseName or locale is null. | |
| 97 | + */ | |
| 98 | + @Override | |
| 99 | + public List<Locale> getCandidateLocales(String baseName, Locale locale) { | |
| 100 | + List<Locale> candidates = super.getCandidateLocales(baseName, locale); | |
| 101 | + candidates.removeAll(excludedJDKLocales); | |
| 102 | + return candidates; | |
| 103 | + } | |
| 104 | + | |
| 105 | + /** | |
| 106 | + * @ returns TTL_DONT_CACHE so that ResourceBundle instance won't be cached. | |
| 107 | + * User of this CoreResourceBundleControl should probably maintain a hard reference | |
| 108 | + * to the ResourceBundle object themselves. | |
| 109 | + */ | |
| 110 | + @Override | |
| 111 | + public long getTimeToLive(String baseName, Locale locale) { | |
| 112 | + return ResourceBundle.Control.TTL_DONT_CACHE; | |
| 113 | + } | |
| 114 | +} | |