com.helger.commons.text.resolve.EnumTextResolverWithPropertiesOverrideAndFallback Maven / Gradle / Ivy
/**
* Copyright (C) 2014-2015 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.text.resolve;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.Set;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.PropertyKey;
import javax.annotation.concurrent.GuardedBy;
import javax.annotation.concurrent.ThreadSafe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.helger.commons.annotation.Nonempty;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.CollectionHelper;
import com.helger.commons.debug.GlobalDebug;
import com.helger.commons.locale.LocaleHelper;
import com.helger.commons.statistics.IMutableStatisticsHandlerKeyedCounter;
import com.helger.commons.statistics.StatisticsManager;
import com.helger.commons.text.resourcebundle.ResourceBundleHelper;
/**
* Text resolving class that performs the fallback handling for locales other
* than German and English. Used only from within the
* {@link DefaultTextResolver} static class.
*
* @author Philip Helger
*/
@ThreadSafe
public class EnumTextResolverWithPropertiesOverrideAndFallback extends AbstractEnumTextResolverWithOverrideAndFallback
{
/** Default classpath prefix for override resources */
public static final String PREFIX_OVERRIDE = "properties/override-";
/** Default classpath prefix for fallback resources */
public static final String PREFIX_FALLBACK = "properties/";
/** By default the resource bundle cache is used */
public static final boolean DEFAULT_USE_RESOURCE_BUNDLE_CACHE = true;
private static final Logger s_aLogger = LoggerFactory.getLogger (EnumTextResolverWithPropertiesOverrideAndFallback.class);
private static final IMutableStatisticsHandlerKeyedCounter s_aStatsFailed = StatisticsManager.getKeyedCounterHandler (EnumTextResolverWithPropertiesOverrideAndFallback.class.getName () +
"$failed");
private final ReadWriteLock m_aRWLock = new ReentrantReadWriteLock ();
@GuardedBy ("m_aRWLock")
private final Set m_aUsedOverrideBundles = new HashSet ();
@GuardedBy ("m_aRWLock")
private final Set m_aUsedFallbackBundles = new HashSet ();
@GuardedBy ("m_aRWLock")
private boolean m_bUseResourceBundleCache = DEFAULT_USE_RESOURCE_BUNDLE_CACHE;
@GuardedBy ("m_aRWLock")
private final Map m_aResourceBundleCache = new HashMap ();
public EnumTextResolverWithPropertiesOverrideAndFallback ()
{}
/**
* Change whether the internal resource bundle cache should be used.
*
* @param bUseResourceBundleCache
* The new value. Pass true to enable it.
*/
public void setUseResourceBundleCache (final boolean bUseResourceBundleCache)
{
m_aRWLock.writeLock ().lock ();
try
{
m_bUseResourceBundleCache = bUseResourceBundleCache;
}
finally
{
m_aRWLock.writeLock ().unlock ();
}
}
/**
* @return true if the internal {@link ResourceBundle} cache
* should be used. The default value is
* {@link #DEFAULT_USE_RESOURCE_BUNDLE_CACHE}.
*/
public boolean isUseResourceBundleCache ()
{
m_aRWLock.readLock ().lock ();
try
{
return m_bUseResourceBundleCache;
}
finally
{
m_aRWLock.readLock ().unlock ();
}
}
/**
* Get the cached {@link ResourceBundle}. It is assumed, that the locale name
* is contained within the bundle name!!
*
* @param sBundleName
* Name of the bundle. May not be null.
* @param aLocale
* Locale to use. May not be null.
* @return null if no such bundle exists
*/
@Nullable
private ResourceBundle _getResourceBundle (@Nonnull @Nonempty final String sBundleName, @Nonnull final Locale aLocale)
{
m_aRWLock.readLock ().lock ();
try
{
if (!m_bUseResourceBundleCache)
{
// Do not use the cache!
return ResourceBundleHelper.getResourceBundle (sBundleName, aLocale);
}
// Existing cache value? May be null!
if (m_aResourceBundleCache.containsKey (sBundleName))
return m_aResourceBundleCache.get (sBundleName);
}
finally
{
m_aRWLock.readLock ().unlock ();
}
m_aRWLock.writeLock ().lock ();
try
{
// Re-check in write lock
if (m_aResourceBundleCache.containsKey (sBundleName))
return m_aResourceBundleCache.get (sBundleName);
// Resolve the resource bundle
final ResourceBundle ret = ResourceBundleHelper.getResourceBundle (sBundleName, aLocale);
m_aResourceBundleCache.put (sBundleName, ret);
return ret;
}
finally
{
m_aRWLock.writeLock ().unlock ();
}
}
@Override
@Nullable
protected String internalGetOverrideString (@Nonnull @PropertyKey final String sID,
@Nonnull final Locale aContentLocale)
{
// Try all possible locales of the passed locale
for (final Locale aLocale : LocaleHelper.getCalculatedLocaleListForResolving (aContentLocale))
{
// Explicitly use a bundle name containing the locale in the base name to
// avoid strange fallback behaviour to the default locale
final String sBundleName = PREFIX_OVERRIDE + aLocale.toString ();
final String ret = ResourceBundleHelper.getString (_getResourceBundle (sBundleName, aLocale), sID);
if (ret != null)
{
// Match!
m_aRWLock.writeLock ().lock ();
try
{
m_aUsedOverrideBundles.add (sBundleName);
}
finally
{
m_aRWLock.writeLock ().unlock ();
}
return ret;
}
}
return null;
}
@Override
@Nullable
protected String internalGetFallbackString (@Nonnull @PropertyKey final String sID,
@Nonnull final Locale aContentLocale)
{
// Try all possible locales of the passed locale
for (final Locale aLocale : LocaleHelper.getCalculatedLocaleListForResolving (aContentLocale))
{
// Explicitly use a bundle name containing the locale in the base name to
// avoid strange fallback behaviour to the default locale
final String sBundleName = PREFIX_FALLBACK + aLocale.toString ();
final String ret = ResourceBundleHelper.getString (_getResourceBundle (sBundleName, aLocale), sID);
if (ret != null)
{
m_aRWLock.writeLock ().lock ();
try
{
m_aUsedFallbackBundles.add (sBundleName);
}
finally
{
m_aRWLock.writeLock ().unlock ();
}
return ret;
}
}
s_aStatsFailed.increment (PREFIX_FALLBACK + aContentLocale.toString () + ':' + sID);
if (GlobalDebug.isDebugMode ())
{
s_aLogger.warn ("getFallbackString (" + sID + "; " + aContentLocale.toString () + ") failed!");
// Return consistent results
if (false)
return "[fallback-" + sID.substring (sID.lastIndexOf ('.') + 1) + "-" + aContentLocale.toString () + "]";
}
return null;
}
/**
* @return A set with all resource keys used in overriding. Never
* null.
*/
@Nonnull
@ReturnsMutableCopy
public Set getAllUsedOverrideBundleNames ()
{
m_aRWLock.readLock ().lock ();
try
{
return CollectionHelper.newSet (m_aUsedOverrideBundles);
}
finally
{
m_aRWLock.readLock ().unlock ();
}
}
/**
* @return A set with all resource keys used as fallback. Never
* null.
*/
@Nonnull
@ReturnsMutableCopy
public Set getAllUsedFallbackBundleNames ()
{
m_aRWLock.readLock ().lock ();
try
{
return CollectionHelper.newSet (m_aUsedFallbackBundles);
}
finally
{
m_aRWLock.readLock ().unlock ();
}
}
public void clearCache ()
{
m_aRWLock.writeLock ().lock ();
try
{
ResourceBundleHelper.clearCache ();
m_aUsedOverrideBundles.clear ();
m_aUsedFallbackBundles.clear ();
m_aResourceBundleCache.clear ();
}
finally
{
m_aRWLock.writeLock ().unlock ();
}
if (s_aLogger.isDebugEnabled ())
s_aLogger.debug ("Cache was cleared: " + getClass ().getName ());
}
}
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