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Particularly handy when used with Hibernate. It allows developers to easily reuse the same pojo classes for both persistence instances and data transfer objects.
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/*
 * Copyright 2005 The Apache Software Foundation.
 *
 * 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 net.sf.beanlib.hibernate;

import java.util.Collections;
import java.util.Set;

import net.sf.beanlib.CollectionPropertyName;
import net.sf.beanlib.ProtectedSetterMethodCollector;
import net.sf.beanlib.api.BeanMethodCollector;
import net.sf.beanlib.api.BeanMethodFinder;
import net.sf.beanlib.api.BeanPopulatable;
import net.sf.beanlib.api.BeanSourceHandler;
import net.sf.beanlib.api.DetailedBeanPopulatable;


/**
 * Hibernate Bean Replicator.  Not thread safe.
 *  
 * @author Joe D. Velopar
 */
public class HibernateBeanReplicator 
{
//	private final Log log = LogFactory.getLog(this.getClass());
	
	private final HibernateBeanTransformable hibernateBeanTransformer;

	private Set entityBeanClassSet;
	private Set collectionPropertyNameSet;
	
	private BeanPopulatable beanPopulatable; 
	private BeanPopulatable vetoer; 

	public HibernateBeanReplicator(HibernateBeanTransformable hibernateBeanTransformer) 
	{
		if (hibernateBeanTransformer == null)
			throw new IllegalArgumentException("Argument hibernateBeanTransformer must not be null");
		this.hibernateBeanTransformer = hibernateBeanTransformer;
	}

	/** Convenient method to replicate a hibernate entity bean to a pure java bean. */
	public final  T copy(T from) {
		return (T)(from == null ? null : copy(from, from.getClass()));
	}

	/** Convenient method to replicate a hibernate entity bean to a pure java bean. */
	public final  T copy(Object from, Class toClass) {
		if (from == null)
			return null;
		if (this.beanPopulatable == null)
			this.beanPopulatable = new HibernateBeanPopulatableSupport(entityBeanClassSet, collectionPropertyNameSet, vetoer);
		hibernateBeanTransformer.initBeanPopulatable(beanPopulatable);
		try {
			return hibernateBeanTransformer.transform(from, toClass);
		} finally {
			hibernateBeanTransformer.reset();
		}
	}
	
	public final  T deepCopy(T from) {
		return (T)(from == null ? null : deepCopy(from, from.getClass()));
	}
    
	public final  T deepCopy(Object from, Class toClass) {
		this.entityBeanClassSet = null;
		this.collectionPropertyNameSet = null;
		this.setDefaultBehavior();
		return this.copy(from, toClass);
	}
    
	public final  T shallowCopy(T from) {
		return (T)(from == null ? null : shallowCopy(from, from.getClass()));
	}

    public final  T shallowCopy(Object from, Class toClass) {
		this.entityBeanClassSet = Collections.emptySet();
		this.collectionPropertyNameSet = Collections.emptySet();
		this.setDefaultBehavior();
		return this.copy(from, toClass);
	}
	
	private void setDefaultBehavior() {
		this.beanPopulatable = null;
//		this.hibernateBeanTransformer = null;
		this.hibernateBeanTransformer.initDetailedBeanPopulatable(null);
		this.hibernateBeanTransformer.initSetterMethodCollector(ProtectedSetterMethodCollector.inst);		
	}

	public final BeanPopulatable getBeanPopulatable() {
		return beanPopulatable;
	}

	public final HibernateBeanReplicator initBeanPopulatable(BeanPopulatable beanPopulatable) {
		this.beanPopulatable = beanPopulatable;
		return this;
	}

	public final HibernateBeanReplicator initCustomTransformer(CustomHibernateBeanTransformable customTransformer) {
		this.hibernateBeanTransformer.initCustomTransformer(customTransformer);
		return this;
	}

	public final HibernateBeanReplicator initBeanSourceHandler(BeanSourceHandler beanSourceHandler) {
		this.hibernateBeanTransformer.initBeanSourceHandler(beanSourceHandler);
		return this;
	}

	public final HibernateBeanReplicator initDebug(boolean debug) {
		this.hibernateBeanTransformer.initDebug(debug);
		return this;
	}

	public final HibernateBeanReplicator initDetailedBeanPopulatable(DetailedBeanPopulatable detailedBeanPopulatable) 
	{
		this.hibernateBeanTransformer.initDetailedBeanPopulatable(detailedBeanPopulatable);
		return this;
	}

	public final Set getEntityBeanClassSet() {
		return entityBeanClassSet;
	}

    /**
     * Used to specify the set of entity beans to be populated.
     * 
     *  @param entityBeanClassSet the set of entity beans to be populated;
     *  or null if all entity bean are to be populated.
     *  @return the current HibernateBeanReplicator instance for command chaining.
     */
	public final HibernateBeanReplicator initEntityBeanClassSet(Set entityBeanClassSet) {
		this.entityBeanClassSet = entityBeanClassSet;
		return this;
	}

	public final Set getCollectionPropertyNameSet() {
		return collectionPropertyNameSet;
	}

    /**
     * Used to specify the set of Collection fields to be populated.
     * 
     * @param collectionPropertyNameSet the set of Collection fields to be populated;
     * or null if all Collection fields are to be populated.
     * @return the current HibernateBeanReplicator instance for command chaining.
     */
	public final HibernateBeanReplicator initCollectionPropertyNameSet(Set collectionPropertyNameSet) 
    {
		this.collectionPropertyNameSet = collectionPropertyNameSet;
		return this;
	}

	public final BeanPopulatable getVetoer() {
		return vetoer;
	}

	public final HibernateBeanReplicator initVetoer(BeanPopulatable vetoer) {
		this.vetoer = vetoer;
		return this;
	}

	public final HibernateBeanReplicator setReaderMethodFinder(BeanMethodFinder readerMethodFinder) {
		this.hibernateBeanTransformer.initReaderMethodFinder(readerMethodFinder);
		return this;
	}

	public final HibernateBeanReplicator initSetterMethodCollector(BeanMethodCollector setterMethodFinder) {
		this.hibernateBeanTransformer.initSetterMethodCollector(setterMethodFinder);
		return this;
	}
}