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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.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);
}
}
}
|
