/*
* Copyright 2011 cruxframework.org.
*
* 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 org.cruxframework.crux.core.i18n;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.PropertyResourceBundle;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.cruxframework.crux.core.config.AbstractPropertiesFactory;
import org.cruxframework.crux.core.config.ConstantsInvocationHandler;
/**
* Factory for messages. Receive an Interface and use it's name to look for
* resource bundles in the classpath. Each interface's method is used as key
* in that property file.
* @author Thiago da Rosa de Bustamante
* @author Gesse S. F. Dafe
*
*/
public class MessagesFactory extends AbstractPropertiesFactory
{
protected static final MessagesFactory instance = new MessagesFactory();
private MessagesFactory()
{
}
/**
* Create a message helper class that access a resource bundle using the methods present in the given interface.
* @param targetInterface
* @return
* @throws MessageException
*/
public static <T> T getMessages(final Class<T> targetInterface) throws MessageException
{
return instance.getConstantsFromProperties(targetInterface);
}
@Override
protected ConstantsInvocationHandler getInvocationHandler(Class<?> targetInterface)
{
return new MessagesInvocationHandler(targetInterface);
}
}
/**
* Dynamic proxy for message resources.
* @author Thiago da Rosa de Bustamante
* @author Gesse S. F. Dafe
*/
class MessagesInvocationHandler extends ConstantsInvocationHandler
{
Map<Locale, PropertyResourceBundle> localeMessages = new HashMap<Locale, PropertyResourceBundle>();
private static final Lock propertiesLock = new ReentrantLock(true);
public MessagesInvocationHandler(Class<?> targetInterface)
{
super(targetInterface, false);
}
@Override
protected <T> PropertyResourceBundle getPropertiesForLocale(final Class<T> targetInterface)
{
Locale userLocale = LocaleResolverInitializer.getLocaleResolver().getUserLocale();
PropertyResourceBundle properties = null;
if (!localeMessages.containsKey(userLocale))
{
propertiesLock.lock();
try
{
properties = loadProperties(targetInterface, userLocale);
localeMessages.put(userLocale, properties);
}
finally
{
propertiesLock.unlock();
}
}
else
{
properties = localeMessages.get(userLocale);
}
return properties;
}
}