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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.hibernate3;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertSame;
import junit.framework.JUnit4TestAdapter;
import net.sf.beanlib.hibernate.CustomHibernateBeanTransformable;
import net.sf.beanlib.hibernate.HibernateBeanReplicator;
import net.sf.beanlib.hibernate.HibernateBeanTransformableSpi;

import org.junit.Test;

/**
 * @author Joe D. Velopar
 */
public class EnumTest {
	public static enum Status {
		BEGIN, WIP, END;
	}
	public static class C {
		private Status status;
		private String testString;
		public Status getStatus() {return status;}
		public void setStatus(Status status) {this.status = status;}
		public String getTestString() {return testString;}
		public void setTestString(String testString) {this.testString = testString;}
	}
    
	@Test public void testCopy() {
		C c = new C();
		c.setStatus(Status.BEGIN);
		c.setTestString("testStr");
		HibernateBeanReplicator replicator = new Hibernate3BeanReplicator().initCustomTransformer(
			new CustomHibernateBeanTransformable() {
				public boolean isTransformable(
                    @SuppressWarnings("unused") Object from, 
                    Class toClass, 
                    @SuppressWarnings("unused") HibernateBeanTransformableSpi hibernateBeanTransformer) 
                {
					return toClass.isEnum();
				}
				@SuppressWarnings("unchecked")
                public  T transform(Object in, @SuppressWarnings("unused") Class toClass) {return (T)in;}
			});
		C c2 = (C)replicator.deepCopy(c);
		assertNotSame(c2, c);
		assertSame(c2.getStatus(), c.getStatus());
		assertEquals(c.getTestString(), c2.getTestString());
	}

    public static junit.framework.Test suite() {
        return new JUnit4TestAdapter(EnumTest.class);
    }
}