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/***********************************************************************************************************************
 *
 * These Foolish Things - Miscellaneous utilities
 * Copyright (C) 2009-2012 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * 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.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://thesefoolishthings.java.net
 * SCM: https://bitbucket.org/tidalwave/thesefoolishthings-src
 *
 **********************************************************************************************************************/
package it.tidalwave.beans;

import java.beans.PropertyDescriptor;
import org.jdesktop.beansbinding.Property;
import net.sf.cglib.proxy.Callback;
import net.sf.cglib.proxy.Enhancer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/***********************************************************************************************************************
 *
 * Thanks to [email protected], [email protected] for contributing the
 * base code.
 * 
 * @author  [email protected]
 * @author  [email protected]
 * @author  Fabrizio Giudici
 * @version $Id$
 * @experimental
 *
 **********************************************************************************************************************/
public abstract class AbstractEnhancer 
  {
    private static final Logger log = LoggerFactory.getLogger(AbstractEnhancer.class);
    
    private final Class interfaces;
    
    public static interface PropertyFilter 
      {
        public boolean accept (PropertyDescriptor propertyDescriptor, Property property);
    
        public static final PropertyFilter DEFAULT_FILTER = new PropertyFilter() 
          {
            public boolean accept (final PropertyDescriptor propertyDescriptor, final Property property) 
              {
                final Class propertyType = propertyDescriptor.getPropertyType();
                return (!propertyType.isPrimitive() && !propertyType.isArray() && !propertyType.getName().startsWith("java"));
              }
          }; 
      }

    public AbstractEnhancer (final Class interfaces) 
      {
        if (interfaces == null)
          {
            throw new IllegalArgumentException("Interface is mandatory");
          }
        
        if (!interfaces.isInterface())
          {
            throw new IllegalArgumentException("Only interfaces allowed here");
          }
        
        this.interfaces = interfaces;
      }
  
    public T createEnhancedBean (final Object bean, final Object ... arguments)
      {
        log.trace("createEnhancedItem({}, {}) - interfaces: {}", new Object[] { bean, arguments, interfaces });
        final long time = System.currentTimeMillis();
        final Enhancer enhancer = new Enhancer();
        enhancer.setClassLoader(Thread.currentThread().getContextClassLoader());
        enhancer.setSuperclass(bean.getClass());
        enhancer.setInterfaces(new Class[] {interfaces});
        enhancer.setCallback(createInterceptor(bean, arguments));
        final T result = (T)enhancer.create();
        log.trace(">>>> created decorator {} in {} msec", result, (int)(System.currentTimeMillis() - time));
        return result;
      }
    
    protected abstract Callback createInterceptor (final Object bean, final Object ... arguments);
  }