/*
* JBoss, Home of Professional Open Source
* Copyright 2007, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.metadata.plugins.loader.reflection;

import org.jboss.metadata.spi.retrieval.MetaDataRetrieval;
import org.jboss.metadata.spi.retrieval.MetaDataRetrievalFactory;
import org.jboss.metadata.spi.scope.CommonLevels;
import org.jboss.metadata.spi.scope.Scope;

/**
 * ClassMetaDataRetrievalFactory.
 * 
 * @author <a href="adrian@jboss.com">Adrian Brock</a>
 * @version $Revision: 1.1 $
 */
public class ClassMetaDataRetrievalFactory implements MetaDataRetrievalFactory
{
   /** The singleton instance */
   public static final ClassMetaDataRetrievalFactory INSTANCE = new ClassMetaDataRetrievalFactory();
   
   public MetaDataRetrieval getMetaDataRetrieval(Scope scope)
   {
      if (scope == null)
         throw new IllegalArgumentException("Null scope");
      if (CommonLevels.CLASS.equals(scope.getScopeLevel()) == false)
         throw new IllegalArgumentException("Not a class scope: " + scope);
      
      // Not a class
      Object qualifier = scope.getQualifier();
      if (qualifier instanceof Class == false)
         return null;
      
      Class<?> clazz = Class.class.cast(qualifier);
      return new AnnotatedElementMetaDataLoader(clazz);
   }
}
