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Java 1.8+ Library with tons of utility classes required in all projects
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/*
* Copyright (C) 2014-2024 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.helger.commons.locale.language;
import java.util.Locale;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;
import javax.annotation.concurrent.ThreadSafe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.annotation.Singleton;
import com.helger.commons.annotation.VisibleForTesting;
import com.helger.commons.collection.impl.CommonsHashSet;
import com.helger.commons.collection.impl.ICommonsSet;
import com.helger.commons.concurrent.SimpleReadWriteLock;
import com.helger.commons.debug.GlobalDebug;
import com.helger.commons.locale.LocaleCache;
import com.helger.commons.locale.LocaleCache.IMissingLocaleHandler;
import com.helger.commons.locale.LocaleHelper;
import com.helger.commons.log.ConditionalLogger;
import com.helger.commons.log.IHasConditionalLogger;
import com.helger.commons.state.EChange;
import com.helger.commons.string.StringHelper;
/**
* This is a global cache for language objects to avoid too many objects flowing
* around.
* This cache is application independent.
*
* @author Philip Helger
* @since v9.1.3
*/
@ThreadSafe
@Singleton
public final class LanguageCache implements IHasConditionalLogger
{
private static final class SingletonHolder
{
private static final LanguageCache INSTANCE = new LanguageCache ();
}
private static final Logger LOGGER = LoggerFactory.getLogger (LanguageCache.class);
private static final ConditionalLogger CONDLOG = new ConditionalLogger (LOGGER, !GlobalDebug.DEFAULT_SILENT_MODE);
private static boolean s_bDefaultInstantiated = false;
private final SimpleReadWriteLock m_aRWLock = new SimpleReadWriteLock ();
/** Contains all known countries (as ISO 639-1 2-letter codes). */
@GuardedBy ("m_aRWLock")
private final ICommonsSet m_aLanguages = new CommonsHashSet <> ();
private LanguageCache ()
{
reinitialize ();
}
/**
* @return true if logging is disabled, false if it
* is enabled.
* @since 9.4.0
*/
public static boolean isSilentMode ()
{
return CONDLOG.isDisabled ();
}
/**
* Enable or disable certain regular log messages.
*
* @param bSilentMode
* true to disable logging, false to enable
* logging
* @return The previous value of the silent mode.
* @since 9.4.0
*/
public static boolean setSilentMode (final boolean bSilentMode)
{
return !CONDLOG.setEnabled (!bSilentMode);
}
public static boolean isInstantiated ()
{
return s_bDefaultInstantiated;
}
@Nonnull
public static LanguageCache getInstance ()
{
final LanguageCache ret = SingletonHolder.INSTANCE;
s_bDefaultInstantiated = true;
return ret;
}
@Nonnull
@VisibleForTesting
EChange addLanguage (@Nonnull final String sLanguage)
{
ValueEnforcer.notNull (sLanguage, "Language");
final String sValidLanguage = LocaleHelper.getValidLanguageCode (sLanguage);
ValueEnforcer.isTrue (sValidLanguage != null, () -> "illegal language code '" + sLanguage + "'");
ValueEnforcer.isEqual (sLanguage, sValidLanguage, () -> "invalid casing of '" + sLanguage + "'");
return m_aRWLock.writeLockedGet ( () -> m_aLanguages.addObject (sValidLanguage));
}
/**
* The normed language locale associated with the provided locale.
*
* @param aLanguage
* Source locale. May be null.
* @return null if the source locale is null or if
* the source locale does not contain language information.
*/
@Nullable
public Locale getLanguage (@Nullable final Locale aLanguage)
{
return aLanguage == null ? null : getLanguage (aLanguage.getLanguage ());
}
/**
* The normed language locale associated with the provided locale.
*
* @param aLanguage
* Source locale. May be null.
* @param aMissingHandler
* The missing locale handler to be passed to {@link LocaleCache}. May
* be null to use {@link LocaleCache} default handler.
* @return null if the source locale is null or if
* the source locale does not contain language information.
* @since 9.4.2
*/
@Nullable
public Locale getLanguageExt (@Nullable final Locale aLanguage, @Nullable final IMissingLocaleHandler aMissingHandler)
{
return aLanguage == null ? null : getLanguageExt (aLanguage.getLanguage (), aMissingHandler);
}
/**
* Resolve the language from the provided string.
* Note: this method may be invoked recursively, if the language code contains
* a locale separator char.
*
* @param sLanguage
* The language code. May be null or empty.
* @return null if the provided language code is
* null or empty.
*/
@Nullable
public Locale getLanguage (@Nullable final String sLanguage)
{
return getLanguageExt (sLanguage, null);
}
/**
* Resolve the language from the provided string.
* Note: this method may be invoked recursively, if the language code contains
* a locale separator char.
*
* @param sLanguage
* The language code. May be null or empty.
* @param aMissingHandler
* The missing locale handler to be passed to {@link LocaleCache}. May
* be null to use {@link LocaleCache} default handler.
* @return null if the provided language code is
* null or empty.
* @since 9.4.2
*/
@Nullable
public Locale getLanguageExt (@Nullable final String sLanguage, @Nullable final IMissingLocaleHandler aMissingHandler)
{
if (StringHelper.hasNoText (sLanguage))
return null;
final LocaleCache aLC = LocaleCache.getInstance ();
final IMissingLocaleHandler aMLH = aMissingHandler != null ? aMissingHandler : aLC
.getDefaultMissingLocaleHandler ();
// Was something like "de_" passed in? -> indirect recursion
if (sLanguage.indexOf (LocaleHelper.LOCALE_SEPARATOR) >= 0)
return getLanguageExt (aLC.getLocaleExt (sLanguage, aMLH), aMLH);
final String sValidLanguage = LocaleHelper.getValidLanguageCode (sLanguage);
if (!containsLanguage (sValidLanguage))
CONDLOG.warn ( () -> "Trying to retrieve unsupported language '" + sLanguage + "'");
return aLC.getLocale (sValidLanguage, "", "", aMLH);
}
/**
* @return a set with all contained languages. Never null.
*/
@Nonnull
@ReturnsMutableCopy
public ICommonsSet getAllLanguages ()
{
return m_aRWLock.readLockedGet (m_aLanguages::getClone);
}
/**
* @return a set with all contained language locales. Never null.
*/
@Nonnull
@ReturnsMutableCopy
public ICommonsSet getAllLanguageLocales ()
{
return m_aRWLock.readLockedGet ( () -> {
final LocaleCache aLC = LocaleCache.getInstance ();
return new CommonsHashSet <> (m_aLanguages, sLanguage -> aLC.getLocale (sLanguage, "", ""));
});
}
/**
* Check if the passed language is known.
*
* @param aLanguage
* The language to check. May be null.
* @return true if the passed language is contained,
* false otherwise.
*/
public boolean containsLanguage (@Nullable final Locale aLanguage)
{
return aLanguage != null && containsLanguage (aLanguage.getLanguage ());
}
/**
* Check if the passed language is known.
*
* @param sLanguage
* The language to check. May be null.
* @return true if the passed language is contained,
* false otherwise.
*/
public boolean containsLanguage (@Nullable final String sLanguage)
{
if (sLanguage == null)
return false;
final String sValidLanguage = LocaleHelper.getValidLanguageCode (sLanguage);
if (sValidLanguage == null)
return false;
return m_aRWLock.readLockedBoolean ( () -> m_aLanguages.contains (sValidLanguage));
}
/**
* Reset the cache to the initial state.
*/
public void reinitialize ()
{
m_aRWLock.writeLocked (m_aLanguages::clear);
for (final Locale aLocale : LocaleCache.getAllDefaultLocales ())
{
final String sLanguage = aLocale.getLanguage ();
if (StringHelper.hasText (sLanguage))
{
// Allows for duplicates!
addLanguage (sLanguage);
}
}
CONDLOG.debug ( () -> "Reinitialized " + LanguageCache.class.getName ());
}
}