/*
* Copyright 2005-2006 the original author or authors.
*
* 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.strecks.converter.internal;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import org.strecks.converter.Converter;
import org.strecks.converter.factory.ConverterFactoryClass;
import org.strecks.converter.factory.ConverterFactory;
import org.strecks.exceptions.ApplicationConfigurationException;
import org.strecks.util.ReflectHelper;
/**
* Reads any <code>Converter</code> declared using an annotation which itself has a <code>ConverterFactoryClass</code>
* annotation
*/
public class ConverterReader
{
/**
* Returns a <code>Converter</code> instance if one of the relevant annotations is used, otherwise returns null
*/
public Converter readConverter(Method method)
{
Annotation[] annotations = method.getAnnotations();
Converter converter = null;
boolean found = false;
for (Annotation annotation : annotations)
{
Class<? extends Annotation> annotationType = annotation.annotationType();
ConverterFactoryClass factoryClass = annotationType.getAnnotation(ConverterFactoryClass.class);
if (factoryClass != null)
{
if (found)
{
throw new ApplicationConfigurationException(
"Only one converter annotation may be placed in method " + method.getName()
+ "() in class " + method.getDeclaringClass().getName());
}
ConverterFactory factory = ReflectHelper.createInstance(factoryClass.value(),
ConverterFactory.class);
converter = factory.createConverter(annotation);
found = true;
}
}
return converter;
}
}