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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.Locale;
import java.util.concurrent.ConcurrentHashMap;
import org.eclipse.jgit.errors.TranslationBundleLoadingException;
import org.eclipse.jgit.errors.TranslationStringMissingException;
/**
* The purpose of this class is to provide NLS (National Language Support)
* configurable per thread.
*
* <p>
* The {@link #setLocale(Locale)} method is used to configure locale for the
* calling thread. The locale setting is thread inheritable. This means that a
* child thread will have the same locale setting as its creator thread until it
* changes it explicitly.
*
* <p>
* Example of usage:
*
* <pre>
* NLS.setLocale(Locale.GERMAN);
* TransportText t = NLS.getBundleFor(TransportText.class);
* </pre>
*/
public class NLS {
/** The root locale constant. It is defined here because the Locale.ROOT is not defined in Java 5 */
public static final Locale ROOT_LOCALE = new Locale("", "", ""); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
private static final InheritableThreadLocal<NLS> local = new InheritableThreadLocal<NLS>() {
@Override
protected NLS initialValue() {
return new NLS(Locale.getDefault());
}
};
/**
* Sets the locale for the calling thread.
* <p>
* The {@link #getBundleFor(Class)} method will honor this setting if if it
* is supported by the provided resource bundle property files. Otherwise,
* it will use a fall back locale as described in the
* {@link TranslationBundle}
*
* @param locale
* the preferred locale
*/
public static void setLocale(Locale locale) {
local.set(new NLS(locale));
}
/**
* Sets the JVM default locale as the locale for the calling thread.
* <p>
* Semantically this is equivalent to <code>NLS.setLocale(Locale.getDefault())</code>.
*/
public static void useJVMDefaultLocale() {
local.set(new NLS(Locale.getDefault()));
}
/**
* Returns an instance of the translation bundle of the required type. All
* public String fields of the bundle instance will get their values
* injected as described in the {@link TranslationBundle}.
*
* @param <T>
* required bundle type
* @param type
* required bundle type
* @return an instance of the required bundle type
* @exception TranslationBundleLoadingException see {@link TranslationBundleLoadingException}
* @exception TranslationStringMissingException see {@link TranslationStringMissingException}
*/
public static <T extends TranslationBundle> T getBundleFor(Class<T> type) {
return local.get().get(type);
}
final private Locale locale;
final private ConcurrentHashMap<Class, TranslationBundle> map = new ConcurrentHashMap<Class, TranslationBundle>();
private NLS(Locale locale) {
this.locale = locale;
}
@SuppressWarnings("unchecked")
private <T extends TranslationBundle> T get(Class<T> type) {
TranslationBundle bundle = map.get(type);
if (bundle == null) {
bundle = GlobalBundleCache.lookupBundle(locale, type);
// There is a small opportunity for a race, which we may
// lose. Accept defeat and return the winner's instance.
TranslationBundle old = map.putIfAbsent(type, bundle);
if (old != null)
bundle = old;
}
return (T) bundle;
}
}
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