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- /*
- * Copyright (C) 2010, Sasa Zivkov <sasa.zivkov@sap.com>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.nls;
-
- 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.newInstance();
- bundle.load(locale);
- bundles.put(type, bundle);
- }
- return (T) bundle;
- } catch (InstantiationException e) {
- throw new Error(e);
- } catch (IllegalAccessException e) {
- throw new Error(e);
- }
- }
- }
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