/*
* Copyright 2014 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.rebind.converter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.cruxframework.crux.core.client.converter.TypeConverter.Converter;
import org.cruxframework.crux.core.rebind.CruxGeneratorException;
import org.cruxframework.crux.scanner.ClassScanner;
/**
* Maps all converters.
* @author Thiago da Rosa de Bustamante
*
*/
public class Converters
{
private static final Log logger = LogFactory.getLog(Converters.class);
private static final Lock lock = new ReentrantLock();
private static Map<String, String> converters;
/**
*
*/
public static void initialize()
{
if (converters != null)
{
return;
}
try
{
lock.lock();
if (converters != null)
{
return;
}
initializeConverters();
}
finally
{
lock.unlock();
}
}
/**
*
*/
protected static void initializeConverters()
{
converters = new HashMap<String, String>();
Set<String> converterNames = ClassScanner.searchClassesByAnnotation(Converter.class);
if (converterNames != null)
{
for (String converterClassName : converterNames)
{
try
{
Class<?> converterClass = Class.forName(converterClassName);
Converter annot = converterClass.getAnnotation(Converter.class);
if (converters.containsKey(annot.value()))
{
throw new CruxGeneratorException("Duplicated Converter found: ["+annot.value()+"].");
}
converters.put(annot.value(), converterClass.getCanonicalName());
}
catch (ClassNotFoundException e)
{
logger.error("Error initializing Converters ["+converterClassName+"].",e);
}
}
}
}
/**
* @param name
* @return
*/
public static String getConverter(String name)
{
if (converters == null)
{
initialize();
}
return converters.get(name);
}
/**
* @return
*/
public static Iterator<String> iterateConverters()
{
if (converters == null)
{
initialize();
}
return converters.keySet().iterator();
}
}