| /* |
| * Copyright (C) 2010, Sasa Zivkov <sasa.zivkov@sap.com> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.nls; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.HashMap; |
| import java.util.Locale; |
| import java.util.Map; |
| |
| import org.eclipse.jgit.errors.TranslationBundleLoadingException; |
| import org.eclipse.jgit.errors.TranslationStringMissingException; |
| |
| /** |
| * Global cache of translation bundles. |
| * <p> |
| * Every translation bundle will be cached here when it gets loaded for the |
| * first time from a thread. Another lookup for the same translation bundle |
| * (same locale and type) from the same or a different thread will return the |
| * cached one. |
| * <p> |
| * Note that NLS instances maintain per-thread Map of loaded translation |
| * bundles. Once a thread accesses a translation bundle it will keep reference |
| * to it and will not call {@link #lookupBundle(Locale, Class)} again for the |
| * same translation bundle as long as its locale doesn't change. |
| */ |
| class GlobalBundleCache { |
| private static final Map<Locale, Map<Class, TranslationBundle>> cachedBundles |
| = new HashMap<>(); |
| |
| /** |
| * Looks up for a translation bundle in the global cache. If found returns |
| * the cached bundle. If not found creates a new instance puts it into the |
| * cache and returns it. |
| * |
| * @param <T> |
| * required bundle type |
| * @param locale |
| * the preferred locale |
| * @param type |
| * required bundle type |
| * @return an instance of the required bundle type |
| * @exception TranslationBundleLoadingException see {@link TranslationBundle#load(Locale)} |
| * @exception TranslationStringMissingException see {@link TranslationBundle#load(Locale)} |
| */ |
| @SuppressWarnings("unchecked") |
| static synchronized <T extends TranslationBundle> T lookupBundle(Locale locale, Class<T> type) { |
| try { |
| Map<Class, TranslationBundle> bundles = cachedBundles.get(locale); |
| if (bundles == null) { |
| bundles = new HashMap<>(); |
| cachedBundles.put(locale, bundles); |
| } |
| TranslationBundle bundle = bundles.get(type); |
| if (bundle == null) { |
| bundle = type.getDeclaredConstructor().newInstance(); |
| bundle.load(locale); |
| bundles.put(type, bundle); |
| } |
| return (T) bundle; |
| } catch (InstantiationException | IllegalAccessException |
| | InvocationTargetException | NoSuchMethodException e) { |
| throw new Error(e); |
| } |
| } |
| |
| static void clear() { |
| cachedBundles.clear(); |
| } |
| } |